ref: 1e9bb75854a336de2a63f9a4fb4d67dd75d682f1
dir: /sys/src/9/pc/devvmx.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "../port/error.h"
#include "ureg.h"
extern int vmxon(u64int);
extern int vmxoff(void);
extern int vmclear(u64int);
extern int vmptrld(u64int);
extern int vmlaunch(Ureg *, int);
extern int vmread(u32int, uintptr *);
extern int vmwrite(u32int, uintptr);
extern int invept(u32int, uvlong, uvlong);
extern int invvpid(u32int, uvlong, uvlong);
static int gotvmx;
static vlong procb_ctls, pinb_ctls;
enum {
VMX_BASIC_MSR = 0x480,
VMX_PINB_CTLS_MSR = 0x481,
VMX_PROCB_CTLS_MSR = 0x482,
VMX_VMEXIT_CTLS_MSR = 0x483,
VMX_VMENTRY_CTLS_MSR = 0x484,
VMX_MISC_MSR = 0x485,
VMX_CR0_FIXED0 = 0x486,
VMX_CR0_FIXED1 = 0x487,
VMX_CR4_FIXED0 = 0x488,
VMX_CR4_FIXED1 = 0x489,
VMX_VMCS_ENUM = 0x48A,
VMX_PROCB_CTLS2_MSR = 0x48B,
VMX_TRUE_PINB_CTLS_MSR = 0x48D,
VMX_TRUE_PROCB_CTLS_MSR = 0x48E,
VMX_TRUE_EXIT_CTLS_MSR = 0x48F,
VMX_TRUE_ENTRY_CTLS_MSR = 0x490,
VMX_VMFUNC_MSR = 0x491,
PINB_CTLS = 0x4000,
PINB_EXITIRQ = 1<<0,
PINB_EXITNMI = 1<<3,
PROCB_CTLS = 0x4002,
PROCB_IRQWIN = 1<<2,
PROCB_TSCOFFSET = 1<<3,
PROCB_EXITHLT = 1<<7,
PROCB_EXITINVLPG = 1<<9,
PROCB_EXITMWAIT = 1<<10,
PROCB_EXITRDPMC = 1<<11,
PROCB_EXITRDTSC = 1<<12,
PROCB_EXITCR3LD = 1<<15,
PROCB_EXITCR3ST = 1<<16,
PROCB_EXITCR8LD = 1<<19,
PROCB_EXITCR8ST = 1<<20,
PROCB_EXITMOVDR = 1<<23,
PROCB_EXITIO = 1<<24,
PROCB_MONTRAP = 1<<27,
PROCB_MSRBITMAP = 1<<28,
PROCB_EXITMONITOR = 1<<29,
PROCB_EXITPAUSE = 1<<30,
PROCB_USECTLS2 = 1<<31,
PROCB_CTLS2 = 0x401E,
PROCB_EPT = 1<<1,
PROCB_EXITGDT = 1<<2,
PROCB_VPID = 1<<5,
PROCB_UNRESTR = 1<<7,
EXC_BITMAP = 0x4004,
PFAULT_MASK = 0x4006,
PFAULT_MATCH = 0x4008,
CR3_TARGCNT = 0x400a,
MSR_BITMAP = 0x2004,
VMEXIT_CTLS = 0x400c,
VMEXIT_ST_DEBUG = 1<<2,
VMEXIT_HOST64 = 1<<9,
VMEXIT_LD_IA32_PERF_GLOBAL_CTRL = 1<<12,
VMEXIT_ST_IA32_PAT = 1<<18,
VMEXIT_LD_IA32_PAT = 1<<19,
VMEXIT_ST_IA32_EFER = 1<<20,
VMEXIT_LD_IA32_EFER = 1<<21,
VMEXIT_MSRSTCNT = 0x400e,
VMEXIT_MSRLDCNT = 0x4010,
VMEXIT_MSRSTADDR = 0x2006,
VMEXIT_MSRLDADDR = 0x2008,
VMENTRY_MSRLDADDR = 0x200A,
VMENTRY_CTLS = 0x4012,
VMENTRY_LD_DEBUG = 1<<2,
VMENTRY_GUEST64 = 1<<9,
VMENTRY_LD_IA32_PERF_GLOBAL_CTRL = 1<<13,
VMENTRY_LD_IA32_PAT = 1<<14,
VMENTRY_LD_IA32_EFER = 1<<15,
VMENTRY_MSRLDCNT = 0x4014,
VMENTRY_INTRINFO = 0x4016,
VMENTRY_INTRCODE = 0x4018,
VMENTRY_INTRILEN = 0x401a,
VMCS_TSC_OFFSET = 0x2010,
VMCS_LINK = 0x2800,
GUEST_ES = 0x800,
GUEST_CS = 0x802,
GUEST_SS = 0x804,
GUEST_DS = 0x806,
GUEST_FS = 0x808,
GUEST_GS = 0x80A,
GUEST_LDTR = 0x80C,
GUEST_TR = 0x80E,
GUEST_CR0 = 0x6800,
GUEST_CR3 = 0x6802,
GUEST_CR4 = 0x6804,
GUEST_ESLIMIT = 0x4800,
GUEST_CSLIMIT = 0x4802,
GUEST_SSLIMIT = 0x4804,
GUEST_DSLIMIT = 0x4806,
GUEST_FSLIMIT = 0x4808,
GUEST_GSLIMIT = 0x480A,
GUEST_LDTRLIMIT = 0x480C,
GUEST_TRLIMIT = 0x480E,
GUEST_GDTRLIMIT = 0x4810,
GUEST_IDTRLIMIT = 0x4812,
GUEST_ESPERM = 0x4814,
GUEST_CSPERM = 0x4816,
GUEST_SSPERM = 0x4818,
GUEST_DSPERM = 0x481A,
GUEST_FSPERM = 0x481C,
GUEST_GSPERM = 0x481E,
GUEST_LDTRPERM = 0x4820,
GUEST_TRPERM = 0x4822,
GUEST_CR0MASK = 0x6000,
GUEST_CR4MASK = 0x6002,
GUEST_CR0SHADOW = 0x6004,
GUEST_CR4SHADOW = 0x6006,
GUEST_ESBASE = 0x6806,
GUEST_CSBASE = 0x6808,
GUEST_SSBASE = 0x680A,
GUEST_DSBASE = 0x680C,
GUEST_FSBASE = 0x680E,
GUEST_GSBASE = 0x6810,
GUEST_LDTRBASE = 0x6812,
GUEST_TRBASE = 0x6814,
GUEST_GDTRBASE = 0x6816,
GUEST_IDTRBASE = 0x6818,
GUEST_DR7 = 0x681A,
GUEST_RSP = 0x681C,
GUEST_RIP = 0x681E,
GUEST_RFLAGS = 0x6820,
GUEST_IA32_DEBUGCTL = 0x2802,
GUEST_IA32_PAT = 0x2804,
GUEST_IA32_EFER = 0x2806,
GUEST_IA32_PERF_GLOBAL_CTRL = 0x2808,
HOST_ES = 0xC00,
HOST_CS = 0xC02,
HOST_SS = 0xC04,
HOST_DS = 0xC06,
HOST_FS = 0xC08,
HOST_GS = 0xC0A,
HOST_TR = 0xC0C,
HOST_CR0 = 0x6C00,
HOST_CR3 = 0x6C02,
HOST_CR4 = 0x6C04,
HOST_FSBASE = 0x6C06,
HOST_GSBASE = 0x6C08,
HOST_TRBASE = 0x6C0A,
HOST_GDTR = 0x6C0C,
HOST_IDTR = 0x6C0E,
HOST_RSP = 0x6C14,
HOST_RIP = 0x6C16,
HOST_IA32_PAT = 0x2C00,
HOST_IA32_EFER = 0x2C02,
HOST_IA32_PERF_GLOBAL_CTRL = 0x2C04,
GUEST_CANINTR = 0x4824,
VM_INSTRERR = 0x4400,
VM_EXREASON = 0x4402,
VM_EXINTRINFO = 0x4404,
VM_EXINTRCODE = 0x4406,
VM_IDTVECINFO = 0x4408,
VM_IDTVECCODE = 0x440A,
VM_EXINSTRLEN = 0x440C,
VM_EXINSTRINFO = 0x440E,
VM_EXQUALIF = 0x6400,
VM_IORCX = 0x6402,
VM_IORSI = 0x6404,
VM_IORDI = 0x6406,
VM_IORIP = 0x6408,
VM_GUESTVA = 0x640A,
VM_GUESTPA = 0x2400,
VM_VPID = 0x000,
VM_EPTPIDX = 0x0004,
VM_EPTP = 0x201A,
VM_EPTPLA = 0x2024,
INVLOCAL = 1,
};
enum {
CR0RSVD = 0x1ffaffc0,
CR4RSVD = 0xff889000,
CR4MCE = 1<<6,
CR4VMXE = 1<<13,
CR4SMXE = 1<<14,
CR4PKE = 1<<22,
CR0KERNEL = CR0RSVD | 0x30 | (uintptr)0xFFFFFFFF00000000ULL,
CR4KERNEL = CR4RSVD | CR4VMXE | CR4SMXE | CR4MCE | CR4PKE | (uintptr)0xFFFFFFFF00000000ULL
};
enum {
MAXMSR = 512,
};
typedef struct VmxMach VmxMach;
typedef struct Vmx Vmx;
typedef struct VmCmd VmCmd;
typedef struct VmMem VmMem;
typedef struct VmIntr VmIntr;
struct VmMem {
uvlong addr;
Segment *seg;
uintptr off;
char *name;
VmMem *next, *prev;
u16int attr;
};
struct VmxMach {
char vmxon[4096]; /* has to be at the start for alignment */
QLock;
int vms;
Vmx *active;
};
#define vmxmach ((VmxMach*)((m)->vmx))
#define vmxmachp(n) ((VmxMach*)(MACHP(n)->vmx))
struct VmIntr {
u32int info, code, ilen;
};
struct Vmx {
uchar vmcs[4096]; /* page aligned */
uvlong pml4[512]; /* page aligned */
u32int msrbits[1024]; /* page aligned */
FPsave fp; /* page aligned */
u64int msrhost[MAXMSR*2]; /* 16 byte aligned */
u64int msrguest[MAXMSR*2]; /* 16 byte aligned */
enum {
VMXINIT,
VMXREADY,
VMXRUNNING,
VMXDEAD,
VMXENDING,
} state;
int index, machno;
char errstr[ERRMAX];
Ureg ureg;
uvlong tscoffset;
u32int procbctls;
uintptr cr2;
uintptr xcr0;
uintptr dr[8]; /* DR7 is also kept in VMCS */
u8int launched;
u8int vpid;
enum {
FLUSHVPID = 1,
FLUSHEPT = 2,
STEP = 4,
POSTEX = 8,
POSTIRQ = 16,
} onentry;
Rendez cmdwait;
Lock cmdlock;
VmCmd *firstcmd, **lastcmd;
VmCmd *postponed;
VmMem mem;
enum {
GOTEXIT = 1,
GOTIRQACK = 2,
} got;
VmIntr exc, irq, irqack;
int nmsr;
};
struct VmCmd {
enum {
CMDFDONE = 1,
CMDFFAIL = 2,
CMDFPOSTP = 4,
} flags;
u8int scratched;
Rendez;
Lock;
int (*cmd)(VmCmd *, va_list);
int retval;
char *errstr;
va_list va;
VmCmd *next;
Vmx *vmx;
};
static char Equit[] = "vmx: ending";
static char *statenames[] = {
[VMXINIT] "init",
[VMXREADY] "ready",
[VMXRUNNING] "running",
[VMXDEAD] "dead",
[VMXENDING]"ending"
};
static Vmx *moribund;
static QLock vmxtablock;
static Vmx **vmxtab;
static int nvmxtab;
void
vmxprocrestore(Proc *p)
{
int s;
Vmx *vmx;
s = splhi();
vmx = p->vmx;
if(vmxmach->active != vmx){
if(vmx != nil && vmptrld(PADDR(vmx->vmcs)) < 0)
panic("VMPTRLD(%p) failed", vmx->vmcs);
vmxmach->active = vmx;
}
splx(s);
}
static u64int
vmcsread(u32int addr)
{
int rc;
u64int val;
val = 0;
rc = vmread(addr, (uintptr *) &val);
if(rc >= 0 && sizeof(uintptr) == 4 && (addr & 0x6000) == 0x2000)
rc = vmread(addr | 1, (uintptr *) &val + 1);
if(rc < 0){
char errbuf[128];
snprint(errbuf, sizeof(errbuf), "vmcsread failed (%#.4ux)", addr);
error(errbuf);
}
return val;
}
static void
vmcswrite(u32int addr, u64int val)
{
int rc;
rc = vmwrite(addr, val);
if(rc >= 0 && sizeof(uintptr) == 4 && (addr & 0x6000) == 0x2000)
rc = vmwrite(addr | 1, val >> 32);
if(rc < 0){
char errbuf[128];
snprint(errbuf, sizeof(errbuf), "vmcswrite failed (%#.4ux = %#.16ullx)", addr, val);
error(errbuf);
}
}
static uvlong
parseval(char *s)
{
uvlong v;
char *p;
v = strtoull(s, &p, 0);
if(p == s || *p != 0) error("invalid value");
return v;
}
static char *
cr0fakeread(Vmx *, char *p, char *e)
{
uvlong guest, mask, shadow;
guest = vmcsread(GUEST_CR0);
mask = vmcsread(GUEST_CR0MASK);
shadow = vmcsread(GUEST_CR0SHADOW);
return seprint(p, e, "%#.*ullx", sizeof(uintptr) * 2, guest & ~mask | shadow & mask);
}
static char *
cr4fakeread(Vmx *, char *p, char *e)
{
uvlong guest, mask, shadow;
guest = vmcsread(GUEST_CR4);
mask = vmcsread(GUEST_CR4MASK);
shadow = vmcsread(GUEST_CR4SHADOW);
return seprint(p, e, "%#.*ullx", sizeof(uintptr) * 2, guest & ~mask | shadow & mask);
}
static void
updatelma(void)
{
uvlong cr0, efer, nefer, ectrl;
if(sizeof(uintptr) != 8) return;
cr0 = vmcsread(GUEST_CR0);
efer = vmcsread(GUEST_IA32_EFER);
nefer = efer & ~0x400 | efer << 2 & cr0 >> 21 & 0x400;
if(efer == nefer) return;
vmcswrite(GUEST_IA32_EFER, nefer);
ectrl = vmcsread(VMENTRY_CTLS);
ectrl = ectrl & ~0x200 | nefer >> 1 & 0x200;
vmcswrite(VMENTRY_CTLS, ectrl);
}
static int
cr0realwrite(Vmx *, char *s)
{
uvlong v;
v = parseval(s);
vmcswrite(GUEST_CR0, vmcsread(GUEST_CR0) & CR0KERNEL | v & ~CR0KERNEL);
updatelma();
return 0;
}
static int
cr0maskwrite(Vmx *, char *s)
{
uvlong v;
v = parseval(s);
vmcswrite(GUEST_CR0MASK, v | CR0KERNEL);
return 0;
}
static int
eferwrite(Vmx *, char *s)
{
uvlong v;
v = parseval(s);
vmcswrite(GUEST_IA32_EFER, v);
updatelma();
return 0;
}
static int
cr4realwrite(Vmx *, char *s)
{
uvlong v;
v = parseval(s);
vmcswrite(GUEST_CR4, vmcsread(GUEST_CR4) & CR4KERNEL | v & ~CR4KERNEL);
return 0;
}
static int
cr4maskwrite(Vmx *, char *s)
{
uvlong v;
v = parseval(s);
vmcswrite(GUEST_CR4MASK, v | CR4KERNEL);
return 0;
}
static int
dr7write(Vmx *vmx, char *s)
{
uvlong v;
v = (u32int) parseval(s);
vmcswrite(GUEST_DR7, vmx->dr[7] = (u32int) v);
return 0;
}
static int
xcr0write(Vmx *vmx, char *s)
{
vmx->xcr0 = parseval(s) & 7;
return 0;
}
static int
readonly(Vmx *, char *)
{
return -1;
}
static int
dr6write(Vmx *vmx, char *s)
{
uvlong v;
v = parseval(s);
vmx->dr[6] = (u32int) v;
return 0;
}
typedef struct GuestReg GuestReg;
struct GuestReg {
int offset;
u8int size; /* in bytes; 0 means == uintptr */
char *name;
char *(*read)(Vmx *, char *, char *);
int (*write)(Vmx *, char *);
};
#define VMXVAR(x) ~(ulong)&(((Vmx*)0)->x)
#define UREG(x) VMXVAR(ureg.x)
static GuestReg guestregs[] = {
{GUEST_RIP, 0, "pc"},
{GUEST_RSP, 0, "sp"},
{GUEST_RFLAGS, 0, "flags"},
{UREG(ax), 0, "ax"},
{UREG(bx), 0, "bx"},
{UREG(cx), 0, "cx"},
{UREG(dx), 0, "dx"},
{UREG(bp), 0, "bp"},
{UREG(si), 0, "si"},
{UREG(di), 0, "di"},
#ifdef RMACH
{UREG(r8), 0, "r8"},
{UREG(r9), 0, "r9"},
{UREG(r10), 0, "r10"},
{UREG(r11), 0, "r11"},
{UREG(r12), 0, "r12"},
{UREG(r13), 0, "r13"},
{UREG(r14), 0, "r14"},
{UREG(r15), 0, "r15"},
#endif
{GUEST_GDTRBASE, 0, "gdtrbase"},
{GUEST_GDTRLIMIT, 4, "gdtrlimit"},
{GUEST_IDTRBASE, 0, "idtrbase"},
{GUEST_IDTRLIMIT, 4, "idtrlimit"},
{GUEST_CS, 2, "cs"},
{GUEST_CSBASE, 0, "csbase"},
{GUEST_CSLIMIT, 4, "cslimit"},
{GUEST_CSPERM, 4, "csperm"},
{GUEST_DS, 2, "ds"},
{GUEST_DSBASE, 0, "dsbase"},
{GUEST_DSLIMIT, 4, "dslimit"},
{GUEST_DSPERM, 4, "dsperm"},
{GUEST_ES, 2, "es"},
{GUEST_ESBASE, 0, "esbase"},
{GUEST_ESLIMIT, 4, "eslimit"},
{GUEST_ESPERM, 4, "esperm"},
{GUEST_FS, 2, "fs"},
{GUEST_FSBASE, 0, "fsbase"},
{GUEST_FSLIMIT, 4, "fslimit"},
{GUEST_FSPERM, 4, "fsperm"},
{GUEST_GS, 2, "gs"},
{GUEST_GSBASE, 0, "gsbase"},
{GUEST_GSLIMIT, 4, "gslimit"},
{GUEST_GSPERM, 4, "gsperm"},
{GUEST_SS, 2, "ss"},
{GUEST_SSBASE, 0, "ssbase"},
{GUEST_SSLIMIT, 4, "sslimit"},
{GUEST_SSPERM, 4, "ssperm"},
{GUEST_TR, 2, "tr"},
{GUEST_TRBASE, 0, "trbase"},
{GUEST_TRLIMIT, 4, "trlimit"},
{GUEST_TRPERM, 4, "trperm"},
{GUEST_LDTR, 2, "ldtr"},
{GUEST_LDTRBASE, 0, "ldtrbase"},
{GUEST_LDTRLIMIT, 4, "ldtrlimit"},
{GUEST_LDTRPERM, 4, "ldtrperm"},
{GUEST_CR0, 0, "cr0real", nil, cr0realwrite},
{GUEST_CR0SHADOW, 0, "cr0fake", cr0fakeread},
{GUEST_CR0MASK, 0, "cr0mask", nil, cr0maskwrite},
{VMXVAR(cr2), 0, "cr2"},
{GUEST_CR3, 0, "cr3"},
{GUEST_CR4, 0, "cr4real", nil, cr4realwrite},
{GUEST_CR4SHADOW, 0, "cr4fake", cr4fakeread},
{GUEST_CR4MASK, 0, "cr4mask", nil, cr4maskwrite},
{GUEST_IA32_PAT, 8, "pat"},
{GUEST_IA32_EFER, 8, "efer", nil, eferwrite},
{VMXVAR(dr[0]), 0, "dr0"},
{VMXVAR(dr[1]), 0, "dr1"},
{VMXVAR(dr[2]), 0, "dr2"},
{VMXVAR(dr[3]), 0, "dr3"},
{VMXVAR(dr[6]), 0, "dr6", nil, dr6write},
{VMXVAR(xcr0), 0, "xcr0", nil, xcr0write},
{GUEST_DR7, 0, "dr7", nil, dr7write},
{VM_INSTRERR, 4, "instructionerror", nil, readonly},
{VM_EXREASON, 4, "exitreason", nil, readonly},
{VM_EXQUALIF, 0, "exitqualification", nil, readonly},
{VM_EXINTRINFO, 4, "exitinterruptinfo", nil, readonly},
{VM_EXINTRCODE, 4, "exitinterruptcode", nil, readonly},
{VM_EXINSTRLEN, 4, "exitinstructionlen", nil, readonly},
{VM_EXINSTRINFO, 4, "exitinstructioninfo", nil, readonly},
{VM_GUESTVA, 0, "exitva", nil, readonly},
{VM_GUESTPA, 0, "exitpa", nil, readonly},
{VM_IDTVECINFO, 4, "idtinterruptinfo", nil, readonly},
{VM_IDTVECCODE, 4, "idtinterruptcode", nil, readonly},
};
static int
vmokpage(u64int addr)
{
return (addr & 0xfff) == 0 && addr >> 48 == 0;
}
static uvlong *
eptwalk(Vmx *vmx, uvlong addr)
{
uvlong *tab, *nt;
uvlong v;
int i;
tab = vmx->pml4;
if(tab == nil) error(Egreg);
for(i = 3; i >= 1; i--){
tab += addr >> 12 + 9 * i & 0x1ff;
v = *tab;
if((v & 3) == 0){
nt = mallocalign(BY2PG, BY2PG, 0, 0);
if(nt == nil) error(Enomem);
memset(nt, 0, BY2PG);
v = PADDR(nt) | 0x407;
*tab = v;
}
tab = KADDR(v & ~0xfff);
}
return tab + (addr >> 12 & 0x1ff);
}
static void
eptfree(uvlong *tab, int level)
{
int i;
uvlong v, *t;
if(tab == nil) error(Egreg);
if(level < 3){
for(i = 0; i < 512; i++){
v = tab[i];
if((v & 3) == 0) continue;
t = KADDR(v & ~0xfff);
eptfree(t, level + 1);
tab[i] = 0;
}
}
if(level > 0)
free(tab);
}
static void
epttranslate(Vmx *vmx, VmMem *mp, uvlong end)
{
uvlong p, v;
if((mp->addr & 0xfff) != 0 || (end & 0xfff) != 0 || (uint)mp->attr >= 0x1000)
error(Egreg);
if(mp->seg != nil){
switch(mp->seg->type & SG_TYPE){
default:
error(Egreg);
case SG_FIXED:
case SG_STICKY:
break;
}
if(mp->seg->base + mp->off + (end - mp->addr) > mp->seg->top)
error(Egreg);
for(p = mp->addr, v = mp->off; p != end; p += BY2PG, v += BY2PG)
*eptwalk(vmx, p) = mp->seg->map[v/PTEMAPMEM]->pages[(v & PTEMAPMEM-1)/BY2PG]->pa | mp->attr;
}else {
for(p = mp->addr; p != end; p += BY2PG)
*eptwalk(vmx, p) = 0;
}
vmx->onentry |= FLUSHEPT;
}
static char *mtype[] = {"uc", "wc", "02", "03", "wt", "wp", "wb", "07"};
static int
cmdgetmeminfo(VmCmd *cmd, va_list va)
{
VmMem *mp;
char *p0, *e, *p;
char attr[4];
char mt[4];
p0 = va_arg(va, char *);
e = va_arg(va, char *);
p = p0;
if(p < e) *p = 0;
for(mp = cmd->vmx->mem.next; mp != &cmd->vmx->mem; mp = mp->next){
if(mp->seg == nil)
continue;
attr[0] = (mp->attr & 1) != 0 ? 'r' : '-';
attr[1] = (mp->attr & 2) != 0 ? 'w' : '-';
attr[2] = (mp->attr & 4) != 0 ? 'x' : '-';
attr[3] = 0;
*(ushort*)mt = *(u16int*)mtype[mp->attr >> 3 & 7];
mt[2] = (mp->attr & 0x40) != 0 ? '!' : 0;
mt[3] = 0;
p = seprint(p, e, "%s %s %#llux %#llux %s %#llux\n", attr, mt, mp->addr, mp->next->addr, mp->name, (uvlong)mp->off);
}
return p - p0;
}
static void
vmmeminsert(VmMem *l, VmMem *p)
{
p->prev = l->prev;
p->next = l;
p->prev->next = p;
p->next->prev = p;
}
static VmMem *
vmmemremove(VmMem *p)
{
VmMem *r;
r = p->next;
p->next->prev = p->prev;
p->prev->next = p->next;
free(p->name);
putseg(p->seg);
free(p);
return r;
}
static int
cmdclearmeminfo(VmCmd *cmd, va_list)
{
VmMem *mp;
Vmx *vmx;
vmx = cmd->vmx;
eptfree(cmd->vmx->pml4, 0);
for(mp = vmx->mem.next; mp != &vmx->mem; )
mp = vmmemremove(mp);
vmx->mem.prev = &vmx->mem;
vmx->mem.next = &vmx->mem;
vmx->onentry |= FLUSHEPT;
return 0;
}
static void
vmmemupdate(Vmx *vmx, VmMem *mp, uvlong end)
{
VmMem *p, *q;
for(p = vmx->mem.prev; p != &vmx->mem; p = p->prev)
if(p->addr <= end || end == 0)
break;
if(p == &vmx->mem || p->addr < mp->addr){
q = smalloc(sizeof(VmMem));
*q = *p;
if(p->seg != nil){
incref(q->seg);
kstrdup(&q->name, p->name);
}
vmmeminsert(p->next, q);
}else
q = p;
if(q->seg != nil)
q->off += end - q->addr;
q->addr = end;
for(p = vmx->mem.next; p != &vmx->mem; p = p->next)
if(p->addr >= mp->addr)
break;
vmmeminsert(p, mp);
while(p != q)
p = vmmemremove(p);
for(p = vmx->mem.next; p != &vmx->mem; )
if(p->seg == p->prev->seg && (p->seg == nil || p->addr - p->prev->addr == p->off - p->prev->off))
p = vmmemremove(p);
else
p = p->next;
}
extern Segment* (*_globalsegattach)(char*);
static int
cmdsetmeminfo(VmCmd *cmd, va_list va)
{
char *p0, *p, *q, *r;
int j;
char *f[10];
VmMem *mp;
int rc;
uvlong end;
p0 = va_arg(va, char *);
p = p0;
mp = nil;
for(;;){
q = strchr(p, '\n');
if(q == 0) break;
*q = 0;
if(mp == nil){
mp = malloc(sizeof(VmMem));
if(mp == nil)
error(Enomem);
}
memset(mp, 0, sizeof(VmMem));
if(waserror()){
putseg(mp->seg);
free(mp->name);
free(mp);
nexterror();
}
rc = tokenize(p, f, nelem(f));
p = q + 1;
if(rc == 0){
poperror();
continue;
}
if(rc != 4 && rc != 6) error("number of fields wrong");
for(q = f[0]; *q != 0; q++)
switch(*q){
case 'r': if((mp->attr & 1) != 0) goto tinval; mp->attr |= 1; break;
case 'w': if((mp->attr & 2) != 0) goto tinval; mp->attr |= 2; break;
case 'x': if((mp->attr & 4) != 0) goto tinval; mp->attr |= 0x404; break;
case '-': break;
default: tinval: error("invalid access field");
}
for(j = 0; j < 8; j++)
if(strncmp(mtype[j], f[1], 2) == 0){
mp->attr |= j << 3;
break;
}
if(j == 8 || strlen(f[1]) > 3) error("invalid memory type");
if(f[1][2] == '!') mp->attr |= 0x40;
else if(f[1][2] != 0) error("invalid memory type");
mp->addr = strtoull(f[2], &r, 0);
if(*r != 0 || !vmokpage(mp->addr)) error("invalid low guest physical address");
end = strtoull(f[3], &r, 0);
if(*r != 0 || !vmokpage(end) || end <= mp->addr) error("invalid high guest physical address");
if((mp->attr & 7) != 0){
if(rc != 6) error("number of fields wrong");
mp->seg = _globalsegattach(f[4]);
if(mp->seg == nil) error("no such segment");
if(mp->seg->base + mp->off + (end - mp->addr) > mp->seg->top) error("out of bounds");
kstrdup(&mp->name, f[4]);
mp->off = strtoull(f[5], &r, 0);
if(*r != 0 || !vmokpage(mp->off)) error("invalid offset");
}
poperror();
epttranslate(cmd->vmx, mp, end);
vmmemupdate(cmd->vmx, mp, end);
mp = nil;
}
free(mp);
return p - p0;
}
static void
vmxreset(void)
{
ulong regs[4];
vlong msr;
int i;
cpuid(1, 0, regs);
if((regs[2] & 1<<5) == 0) return;
/* check if disabled by BIOS */
if(rdmsr(0x3a, &msr) < 0) return;
if((msr & 5) != 5){
if((msr & 1) == 0){ /* msr still unlocked */
wrmsr(0x3a, msr | 5);
if(rdmsr(0x3a, &msr) < 0)
return;
}
if((msr & 5) != 5)
return;
}
if(rdmsr(VMX_PROCB_CTLS_MSR, &msr) < 0) return;
if((vlong)msr >= 0) return;
if(rdmsr(VMX_PROCB_CTLS2_MSR, &msr) < 0) return;
if((msr >> 32 & PROCB_EPT) == 0 || (msr >> 32 & PROCB_VPID) == 0) return;
for(i = 0; i < conf.nmach; i++){
MACHP(i)->vmx = mallocalign(sizeof(VmxMach), 4096, 0, 0);
if(vmxmachp(i) == nil)
error(Enomem);
}
gotvmx = 1;
}
static void
vmxaddmsr(Vmx *vmx, u32int msr, u64int gval)
{
int i;
if(vmx->nmsr >= MAXMSR)
error("too many MSRs");
i = 2 * vmx->nmsr++;
vmx->msrhost[i] = msr;
rdmsr(msr, (vlong *) &vmx->msrhost[i+1]);
vmx->msrguest[i] = msr;
vmx->msrguest[i+1] = gval;
vmcswrite(VMENTRY_MSRLDCNT, vmx->nmsr);
vmcswrite(VMEXIT_MSRSTCNT, vmx->nmsr);
vmcswrite(VMEXIT_MSRLDCNT, vmx->nmsr);
}
static void
vmxtrapmsr(Vmx *vmx, u32int msr, enum { TRAPRD = 1, TRAPWR = 2 } state)
{
u32int m;
if(msr >= 0x2000 && (u32int)(msr - 0xc0000000) >= 0x2000)
return;
msr = msr & 0x1fff | msr >> 18 & 0x2000;
m = 1<<(msr & 31);
if((state & TRAPRD) != 0)
vmx->msrbits[msr / 32] |= m;
else
vmx->msrbits[msr / 32] &= ~m;
if((state & TRAPWR) != 0)
vmx->msrbits[msr / 32 + 512] |= m;
else
vmx->msrbits[msr / 32 + 512] &= ~m;
}
static void
vmcsinit(Vmx *vmx)
{
vlong msr;
u32int x;
memset(&vmx->ureg, 0, sizeof(vmx->ureg));
vmx->launched = 0;
vmx->onentry = 0;
if(rdmsr(VMX_BASIC_MSR, &msr) < 0) error("rdmsr(VMX_BASIC_MSR) failed");
if((msr & 1ULL<<55) != 0){
if(rdmsr(VMX_TRUE_PROCB_CTLS_MSR, &procb_ctls) < 0) error("rdmsr(VMX_TRUE_PROCB_CTLS_MSR) failed");
if(rdmsr(VMX_TRUE_PINB_CTLS_MSR, &pinb_ctls) < 0) error("rdmsr(VMX_TRUE_PINB_CTLS_MSR) failed");
}else{
if(rdmsr(VMX_PROCB_CTLS_MSR, &procb_ctls) < 0) error("rdmsr(VMX_PROCB_CTLS_MSR) failed");
if(rdmsr(VMX_PINB_CTLS_MSR, &pinb_ctls) < 0) error("rdmsr(VMX_PINB_CTLS_MSR) failed");
}
if(rdmsr(VMX_PINB_CTLS_MSR, &msr) < 0) error("rdmsr(VMX_PINB_CTLS_MSR failed");
x = (u32int)pinb_ctls | 1<<1 | 1<<2 | 1<<4; /* currently reserved default1 bits */
x |= PINB_EXITIRQ | PINB_EXITNMI;
x &= pinb_ctls >> 32;
vmcswrite(PINB_CTLS, x);
if(rdmsr(VMX_PROCB_CTLS_MSR, &msr) < 0) error("rdmsr(VMX_PROCB_CTLS_MSR failed");
x = (u32int)procb_ctls | 1<<1 | 7<<4 | 1<<8 | 1<<13 | 1<<14 | 1<<26; /* currently reserved default1 bits */
x |= PROCB_TSCOFFSET | PROCB_EXITMWAIT | PROCB_EXITMONITOR | PROCB_EXITHLT;
x |= PROCB_EXITMOVDR | PROCB_EXITIO | PROCB_MSRBITMAP;
x |= PROCB_USECTLS2;
x &= msr >> 32;
vmcswrite(PROCB_CTLS, x);
vmx->procbctls = x;
if(rdmsr(VMX_PROCB_CTLS2_MSR, &msr) < 0) error("rdmsr(VMX_PROCB_CTLS2_MSR failed");
x = PROCB_EPT | PROCB_VPID | PROCB_UNRESTR;
x &= msr >> 32;
vmcswrite(PROCB_CTLS2, x);
if(rdmsr(VMX_VMEXIT_CTLS_MSR, &msr) < 0) error("rdmsr(VMX_VMEXIT_CTLS_MSR failed");
x = (u32int)msr;
if(sizeof(uintptr) == 8) x |= VMEXIT_HOST64;
x |= VMEXIT_LD_IA32_PAT | VMEXIT_LD_IA32_EFER | VMEXIT_ST_DEBUG | VMEXIT_ST_IA32_EFER;
x &= msr >> 32;
vmcswrite(VMEXIT_CTLS, x);
if(rdmsr(VMX_VMENTRY_CTLS_MSR, &msr) < 0) error("rdmsr(VMX_VMENTRY_CTLS_MSR failed");
x = (u32int)msr;
x |= VMENTRY_LD_IA32_PAT | VMENTRY_LD_IA32_EFER | VMENTRY_LD_DEBUG;
x &= msr >> 32;
vmcswrite(VMENTRY_CTLS, x);
vmcswrite(CR3_TARGCNT, 0);
vmcswrite(VMENTRY_INTRINFO, 0);
vmcswrite(VMCS_LINK, -1);
vmcswrite(HOST_CS, KESEL);
vmcswrite(HOST_DS, KDSEL);
vmcswrite(HOST_ES, KDSEL);
vmcswrite(HOST_FS, KDSEL);
vmcswrite(HOST_GS, KDSEL);
vmcswrite(HOST_SS, KDSEL);
vmcswrite(HOST_TR, TSSSEL);
vmcswrite(HOST_CR0, getcr0() & ~0xe);
vmcswrite(HOST_CR3, getcr3());
vmcswrite(HOST_CR4, getcr4());
rdmsr(FSbase, &msr);
vmcswrite(HOST_FSBASE, msr);
rdmsr(GSbase, &msr);
vmcswrite(HOST_GSBASE, msr);
vmcswrite(HOST_TRBASE, (uintptr) m->tss);
vmcswrite(HOST_GDTR, (uintptr) m->gdt);
vmcswrite(HOST_IDTR, IDTADDR);
if(rdmsr(0x277, &msr) < 0) error("rdmsr(IA32_PAT) failed");
vmcswrite(HOST_IA32_PAT, msr);
if(rdmsr(Efer, &msr) < 0) error("rdmsr(IA32_EFER) failed");
vmcswrite(HOST_IA32_EFER, msr);
vmcswrite(EXC_BITMAP, 1<<18|1<<1);
vmcswrite(PFAULT_MASK, 0);
vmcswrite(PFAULT_MATCH, 0);
vmcswrite(GUEST_CSBASE, 0);
vmcswrite(GUEST_DSBASE, 0);
vmcswrite(GUEST_ESBASE, 0);
vmcswrite(GUEST_FSBASE, 0);
vmcswrite(GUEST_GSBASE, 0);
vmcswrite(GUEST_SSBASE, 0);
vmcswrite(GUEST_CSLIMIT, -1);
vmcswrite(GUEST_DSLIMIT, -1);
vmcswrite(GUEST_ESLIMIT, -1);
vmcswrite(GUEST_FSLIMIT, -1);
vmcswrite(GUEST_GSLIMIT, -1);
vmcswrite(GUEST_SSLIMIT, -1);
vmcswrite(GUEST_CSPERM, (SEGG|SEGD|SEGP|SEGPL(0)|SEGEXEC|SEGR) >> 8 | 1);
vmcswrite(GUEST_DSPERM, (SEGG|SEGB|SEGP|SEGPL(0)|SEGDATA|SEGW) >> 8 | 1);
vmcswrite(GUEST_ESPERM, (SEGG|SEGB|SEGP|SEGPL(0)|SEGDATA|SEGW) >> 8 | 1);
vmcswrite(GUEST_FSPERM, (SEGG|SEGB|SEGP|SEGPL(0)|SEGDATA|SEGW) >> 8 | 1);
vmcswrite(GUEST_GSPERM, (SEGG|SEGB|SEGP|SEGPL(0)|SEGDATA|SEGW) >> 8 | 1);
vmcswrite(GUEST_SSPERM, (SEGG|SEGB|SEGP|SEGPL(0)|SEGDATA|SEGW) >> 8 | 1);
vmcswrite(GUEST_LDTRPERM, 1<<16);
vmcswrite(GUEST_CR0MASK, CR0KERNEL);
vmcswrite(GUEST_CR4MASK, CR4KERNEL);
vmcswrite(GUEST_CR0, getcr0() & CR0KERNEL | 0x31);
vmcswrite(GUEST_CR3, 0);
vmcswrite(GUEST_CR4, getcr4() & CR4KERNEL);
vmcswrite(GUEST_CR0SHADOW, getcr0() & CR0KERNEL | 0x31);
vmcswrite(GUEST_CR4SHADOW, getcr4() & ~CR4VMXE & CR4KERNEL);
vmcswrite(GUEST_IA32_PAT, 0x0007040600070406ULL);
vmcswrite(GUEST_IA32_EFER, 0);
vmcswrite(GUEST_TRBASE, 0);
vmcswrite(GUEST_TRLIMIT, 0xffff);
vmcswrite(GUEST_TRPERM, (SEGTSS|SEGPL(0)|SEGP) >> 8 | 2);
vmcswrite(VM_EPTP, PADDR(vmx->pml4) | 3<<3);
vmx->vpid = 1;
vmcswrite(VM_VPID, vmx->vpid);
vmcswrite(GUEST_RFLAGS, 2);
vmx->onentry = FLUSHVPID | FLUSHEPT;
fpinit();
vmx->xcr0 = m->xcr0 & 1; /* x87 alone */
memset(vmx->msrbits, -1, 4096);
vmxtrapmsr(vmx, Efer, 0);
vmcswrite(VMENTRY_MSRLDADDR, PADDR(vmx->msrguest));
vmcswrite(VMEXIT_MSRSTADDR, PADDR(vmx->msrguest));
vmcswrite(VMEXIT_MSRLDADDR, PADDR(vmx->msrhost));
vmcswrite(MSR_BITMAP, PADDR(vmx->msrbits));
if(vmx->procbctls & PROCB_TSCOFFSET){
cycles(&vmx->tscoffset);
vmcswrite(VMCS_TSC_OFFSET, vmx->tscoffset);
}
if(sizeof(uintptr) == 8){
vmxaddmsr(vmx, Star, 0);
vmxaddmsr(vmx, Lstar, 0);
vmxaddmsr(vmx, Cstar, 0);
vmxaddmsr(vmx, Sfmask, 0);
vmxaddmsr(vmx, KernelGSbase, 0);
vmxtrapmsr(vmx, Star, 0);
vmxtrapmsr(vmx, Lstar, 0);
vmxtrapmsr(vmx, Cstar, 0);
vmxtrapmsr(vmx, Sfmask, 0);
vmxtrapmsr(vmx, FSbase, 0);
vmxtrapmsr(vmx, GSbase, 0);
vmxtrapmsr(vmx, KernelGSbase, 0);
}
}
static void
vmxstart(Vmx *vmx)
{
vlong msr, msr2;
uintptr cr;
vlong x;
putcr4(getcr4() | CR4VMXE);
putcr0(getcr0() | 0x20); /* set NE */
cr = getcr0();
if(rdmsr(VMX_CR0_FIXED0, &msr) < 0) error("rdmsr(VMX_CR0_FIXED0) failed");
if(rdmsr(VMX_CR0_FIXED1, &msr2) < 0) error("rdmsr(VMX_CR0_FIXED1) failed");
if((cr & ~msr & ~msr2 | ~cr & msr & msr2) != 0) error("invalid CR0 value");
cr = getcr4();
if(rdmsr(VMX_CR4_FIXED0, &msr) < 0) error("rdmsr(VMX_CR4_FIXED0) failed");
if(rdmsr(VMX_CR4_FIXED1, &msr2) < 0) error("rdmsr(VMX_CR4_FIXED1) failed");
if((cr & ~msr & ~msr2 | ~cr & msr & msr2) != 0) error("invalid CR4 value");
rdmsr(VMX_BASIC_MSR, &x);
qlock(vmxmach);
if(waserror()){
qunlock(vmxmach);
nexterror();
}
if(vmxmach->vms == 0){
memset(vmxmach->vmxon, 0, sizeof(vmxmach->vmxon));
*(ulong*)vmxmach->vmxon = x;
if(vmxon(PADDR(vmxmach->vmxon)) < 0)
error("vmxon failed");
}
vmxmach->vms++;
qunlock(vmxmach);
poperror();
memset(vmx->vmcs, 0, sizeof(vmx->vmcs));
*(ulong*)vmx->vmcs = x;
if(vmclear(PADDR(vmx->vmcs)) < 0)
error("vmclear failed");
up->vmx = vmx;
vmxprocrestore(up);
vmcsinit(vmx);
}
static void
cmdrelease(VmCmd *p, int f)
{
lock(p);
p->flags |= CMDFDONE | f;
wakeup(p);
unlock(p);
}
static void
killcmds(Vmx *vmx, VmCmd *notme)
{
VmCmd *p, *pn;
for(p = vmx->postponed; p != nil; p = pn){
pn = p->next;
p->next = nil;
if(p == notme) continue;
kstrcpy(p->errstr, Equit, ERRMAX);
cmdrelease(p, CMDFFAIL);
}
vmx->postponed = nil;
ilock(&vmx->cmdlock);
for(p = vmx->firstcmd; p != nil; p = pn){
pn = p->next;
p->next = nil;
if(p == notme) continue;
kstrcpy(p->errstr, Equit, ERRMAX);
cmdrelease(p, CMDFFAIL);
}
vmx->firstcmd = nil;
vmx->lastcmd = &vmx->firstcmd;
iunlock(&vmx->cmdlock);
}
static int
cmdquit(VmCmd *p, va_list va)
{
Vmx *vmx;
vmx = p->vmx;
vmx->state = VMXENDING;
killcmds(vmx, p);
cmdclearmeminfo(p, va);
up->vmx = nil;
vmxprocrestore(up);
vmclear(PADDR(vmx->vmcs));
qlock(vmxmach);
if(--vmxmach->vms == 0)
vmxoff();
qunlock(vmxmach);
qlock(&vmxtablock);
if(moribund == vmx)
moribund = nil;
vmxtab[vmx->index] = nil;
qunlock(&vmxtablock);
free(vmx);
cmdrelease(p, 0);
pexit(Equit, 1);
return 0;
}
static void
processexit(Vmx *vmx)
{
u32int reason;
reason = vmcsread(VM_EXREASON);
if((reason & 1<<31) == 0)
switch(reason & 0xffff){
case 1: /* external interrupt */
case 3: /* INIT */
case 4: /* SIPI */
case 5: /* IO SMI */
case 6: /* SMI */
case 7: /* IRQ window */
case 8: /* NMI window */
return;
}
vmx->state = VMXREADY;
vmx->got |= GOTEXIT;
vmx->onentry &= ~STEP;
}
static int
cmdgetregs(VmCmd *cmd, va_list va)
{
char *p0, *e;
GuestReg *r;
uvlong val;
int s;
char *p;
p0 = va_arg(va, char *);
e = va_arg(va, char *);
p = p0;
for(r = guestregs; r < guestregs + nelem(guestregs); r++)
if(r->read != nil){
p = seprint(p, e, "%s ", r->name);
p = r->read(cmd->vmx, p, e);
p = strecpy(p, e, "\n");
}else{
if(r->offset >= 0)
val = vmcsread(r->offset);
else
val = *(uintptr*)((uchar*)cmd->vmx + ~r->offset);
s = r->size;
if(s == 0) s = sizeof(uintptr);
p = seprint(p, e, "%s %#.*llux\n", r->name, s * 2, val);
}
return p - p0;
}
static int
setregs(Vmx *vmx, char *p0, char rs, char *fs)
{
char *p, *q, *rp;
char *f[10];
GuestReg *r;
uvlong val;
int sz;
int rc;
p = p0;
for(;;){
q = strchr(p, rs);
if(q == 0) break;
*q = 0;
rc = getfields(p, f, nelem(f), 1, fs);
p = q + 1;
if(rc == 0) continue;
if(rc != 2) error("number of fields wrong");
for(r = guestregs; r < guestregs + nelem(guestregs); r++)
if(strcmp(r->name, f[0]) == 0)
break;
if(r == guestregs + nelem(guestregs))
error("unknown register");
if(r->write != nil){
r->write(vmx, f[1]);
continue;
}
val = strtoull(f[1], &rp, 0);
sz = r->size;
if(sz == 0) sz = sizeof(uintptr);
if(rp == f[1] || *rp != 0) error("invalid value");
if(r->offset >= 0)
vmcswrite(r->offset, val);
else{
assert((u32int)~r->offset + sz <= sizeof(Vmx));
switch(sz){
case 1: *(u8int*)((u8int*)vmx + (u32int)~r->offset) = val; break;
case 2: *(u16int*)((u8int*)vmx + (u32int)~r->offset) = val; break;
case 4: *(u32int*)((u8int*)vmx + (u32int)~r->offset) = val; break;
case 8: *(u64int*)((u8int*)vmx + (u32int)~r->offset) = val; break;
default: error(Egreg);
}
}
}
return p - p0;
}
static int
cmdsetregs(VmCmd *cmd, va_list va)
{
return setregs(cmd->vmx, va_arg(va, char *), '\n', " \t");
}
static int
cmdgetfpregs(VmCmd *cmd, va_list va)
{
uchar *p;
p = va_arg(va, uchar *);
memmove(p, &cmd->vmx->fp, sizeof(FPsave));
return sizeof(FPsave);
}
static int
cmdsetfpregs(VmCmd *cmd, va_list va)
{
uchar *p;
ulong n;
vlong off;
p = va_arg(va, uchar *);
n = va_arg(va, ulong);
off = va_arg(va, vlong);
if(off < 0 || off >= sizeof(FPsave)) n = 0;
else if(off + n > sizeof(FPsave)) n = sizeof(FPsave) - n;
memmove((uchar*)&cmd->vmx->fp + off, p, n);
return n;
}
static int
cmdgo(VmCmd *cmd, va_list va)
{
int step;
char *r;
Vmx *vmx;
vmx = cmd->vmx;
if(vmx->state != VMXREADY)
error("VM not ready");
step = va_arg(va, int);
r = va_arg(va, char *);
if(r != nil) setregs(vmx, r, ';', "=");
if(step) vmx->onentry |= STEP;
vmx->state = VMXRUNNING;
return 0;
}
static int
cmdstop(VmCmd *cmd, va_list)
{
Vmx *vmx;
vmx = cmd->vmx;
if(vmx->state != VMXREADY && vmx->state != VMXRUNNING)
error("VM not ready or running");
vmx->state = VMXREADY;
return 0;
}
static int
cmdstatus(VmCmd *cmd, va_list va)
{
kstrcpy(va_arg(va, char *), cmd->vmx->errstr, ERRMAX);
return cmd->vmx->state;
}
static char *exitreasons[] = {
[0] "exc", [1] "extirq", [2] "triplef", [3] "initsig", [4] "sipi", [5] "smiio", [6] "smiother", [7] "irqwin",
[8] "nmiwin", [9] "taskswitch", [10] ".cpuid", [11] ".getsec", [12] ".hlt", [13] ".invd", [14] ".invlpg", [15] ".rdpmc",
[16] ".rdtsc", [17] ".rsm", [18] ".vmcall", [19] ".vmclear", [20] ".vmlaunch", [21] ".vmptrld", [22] ".vmptrst", [23] ".vmread",
[24] ".vmresume", [25] ".vmwrite", [26] ".vmxoff", [27] ".vmxon", [28] "movcr", [29] ".movdr", [30] "io", [31] ".rdmsr",
[32] ".wrmsr", [33] "entrystate", [34] "entrymsr", [36] ".mwait", [37] "monitortrap", [39] ".monitor",
[40] ".pause", [41] "mcheck", [43] "tpr", [44] "apicacc", [45] "eoi", [46] "gdtr_idtr", [47] "ldtr_tr",
[48] "eptfault", [49] "eptinval", [50] ".invept", [51] ".rdtscp", [52] "preempt", [53] ".invvpid", [54] ".wbinvd", [55] ".xsetbv",
[56] "apicwrite", [57] ".rdrand", [58] ".invpcid", [59] ".vmfunc", [60] ".encls", [61] ".rdseed", [62] "pmlfull", [63] ".xsaves",
[64] ".xrstors",
};
static char *except[] = {
[0] "#de", [1] "#db", [3] "#bp", [4] "#of", [5] "#br", [6] "#ud", [7] "#nm",
[8] "#df", [10] "#ts", [11] "#np", [12] "#ss", [13] "#gp", [14] "#pf",
[16] "#mf", [17] "#ac", [18] "#mc", [19] "#xm", [20] "#ve",
};
static int
cmdwait(VmCmd *cp, va_list va)
{
char *p, *p0, *e;
u32int reason, intr;
uvlong qual;
u16int rno;
Vmx *vmx;
if(cp->scratched)
error(Eintr);
vmx = cp->vmx;
p0 = p = va_arg(va, char *);
e = va_arg(va, char *);
if((vmx->got & GOTIRQACK) != 0){
p = seprint(p, e, "*ack %d\n", vmx->irqack.info & 0xff);
vmx->got &= ~GOTIRQACK;
return p - p0;
}
if((vmx->got & GOTEXIT) == 0){
cp->flags |= CMDFPOSTP;
return -1;
}
vmx->got &= ~GOTEXIT;
reason = vmcsread(VM_EXREASON);
qual = vmcsread(VM_EXQUALIF);
rno = reason;
intr = vmcsread(VM_EXINTRINFO);
if((reason & 1<<31) != 0)
p = seprint(p, e, "!");
if(rno == 0 && (intr & 1<<31) != 0){
if((intr & 0xff) >= nelem(except) || except[intr & 0xff] == nil)
p = seprint(p, e, "#%d ", intr & 0xff);
else
p = seprint(p, e, "%s ", except[intr & 0xff]);
}else if(rno >= nelem(exitreasons) || exitreasons[rno] == nil)
p = seprint(p, e, "?%d ", rno);
else
p = seprint(p, e, "%s ", exitreasons[rno]);
p = seprint(p, e, "%#ullx pc %#ullx sp %#ullx ilen %#ullx iinfo %#ullx", qual, vmcsread(GUEST_RIP), vmcsread(GUEST_RSP), vmcsread(VM_EXINSTRLEN), vmcsread(VM_EXINSTRINFO));
if((intr & 1<<11) != 0) p = seprint(p, e, " excode %#ullx", vmcsread(VM_EXINTRCODE));
if(rno == 48 && (qual & 0x80) != 0) p = seprint(p, e, " va %#ullx", vmcsread(VM_GUESTVA));
if(rno == 48 || rno == 49) p = seprint(p, e, " pa %#ullx", vmcsread(VM_GUESTPA));
if(rno == 30) p = seprint(p, e, " ax %#ullx", (uvlong)vmx->ureg.ax);
p = seprint(p, e, "\n");
return p - p0;
}
static void
eventparse(char *p, VmIntr *vi)
{
char *q, *r;
int i;
memset(vi, 0, sizeof(VmIntr));
q = nil;
kstrdup(&q, p);
if(waserror()){
free(q);
memset(vi, 0, sizeof(VmIntr));
nexterror();
}
vi->info = 1<<31;
r = strchr(q, ',');
if(r != nil) *r++ = 0;
for(i = 0; i < nelem(except); i++)
if(except[i] != nil && strcmp(except[i], q) == 0)
break;
if(*q == '#'){
q++;
vi->info |= 3 << 8;
}
if(i == nelem(except)){
i = strtoul(q, &q, 10);
if(*q != 0 || i > 255) error(Ebadctl);
}
vi->info |= i;
if((vi->info & 0x7ff) == 3 || (vi->info & 0x7ff) == 4)
vi->info += 3 << 8;
if(r == nil) goto out;
if(*r != ','){
vi->code = strtoul(r, &r, 0);
vi->info |= 1<<11;
}else r++;
if(*r == ',')
vi->ilen = strtoul(r + 1, &r, 0);
if(*r != 0) error(Ebadctl);
out:
poperror();
free(q);
}
static int
cmdexcept(VmCmd *cp, va_list va)
{
Vmx *vmx;
vmx = cp->vmx;
if(cp->scratched) error(Eintr);
if((vmx->onentry & POSTEX) != 0){
cp->flags |= CMDFPOSTP;
return 0;
}
eventparse(va_arg(va, char *), &vmx->exc);
vmx->onentry |= POSTEX;
return 0;
}
static int
cmdirq(VmCmd *cmd, va_list va)
{
char *p;
VmIntr vi;
Vmx *vmx;
vmx = cmd->vmx;
p = va_arg(va, char *);
if(p == nil)
vmx->onentry &= ~POSTIRQ;
else{
eventparse(p, &vi);
vmx->irq = vi;
vmx->onentry |= POSTIRQ;
}
return 0;
}
static int
cmdextrap(VmCmd *, va_list va)
{
char *p, *q;
u32int v;
p = va_arg(va, char *);
v = strtoul(p, &q, 0);
if(q == p || *q != 0) error(Ebadarg);
vmcswrite(EXC_BITMAP, v);
return 0;
}
static int
gotcmd(void *vmxp)
{
Vmx *vmx = vmxp;
return vmx->firstcmd != nil;
}
static void
markcmddone(VmCmd *p, VmCmd ***pp)
{
if((p->flags & (CMDFFAIL|CMDFPOSTP)) == CMDFPOSTP){
**pp = p;
*pp = &p->next;
}else{
p->flags = p->flags & ~CMDFPOSTP;
cmdrelease(p, 0);
}
}
static VmCmd **
markppcmddone(VmCmd **pp)
{
VmCmd *p;
p = *pp;
if((p->flags & (CMDFFAIL|CMDFPOSTP)) == CMDFPOSTP)
return &p->next;
*pp = p->next;
p->next = nil;
p->flags = p->flags & ~CMDFPOSTP;
cmdrelease(p, 0);
return pp;
}
static void
runcmd(Vmx *vmx)
{
VmCmd *p, **pp;
for(pp = &vmx->postponed; p = *pp, p != nil; ){
if(waserror()){
kstrcpy(p->errstr, up->errstr, ERRMAX);
p->flags |= CMDFFAIL;
pp = markppcmddone(pp);
continue;
}
p->flags &= ~CMDFPOSTP;
p->retval = p->cmd(p, p->va);
poperror();
pp = markppcmddone(pp);
}
for(;;){
ilock(&vmx->cmdlock);
p = vmx->firstcmd;
if(p == nil){
iunlock(&vmx->cmdlock);
break;
}
vmx->firstcmd = p->next;
if(vmx->lastcmd == &p->next)
vmx->lastcmd = &vmx->firstcmd;
iunlock(&vmx->cmdlock);
p->next = nil;
if(waserror()){
kstrcpy(p->errstr, up->errstr, ERRMAX);
p->flags |= CMDFFAIL;
markcmddone(p, &pp);
continue;
}
if(p->scratched) error(Eintr);
p->retval = p->cmd(p, p->va);
poperror();
markcmddone(p, &pp);
}
}
static void
vmxproc(void *vmxp)
{
int init, rc, x, useend;
u32int procbctls, defprocbctls;
u64int start, end, adj;
vlong v;
Vmx *vmx;
vmx = vmxp;
procwired(up, vmx->machno);
sched();
init = 0;
useend = 0;
adj = 0;
defprocbctls = 0;
while(waserror()){
kstrcpy(vmx->errstr, up->errstr, ERRMAX);
vmx->state = VMXDEAD;
}
for(;;){
if(!init){
init = 1;
vmxstart(vmx);
vmx->state = VMXREADY;
defprocbctls = vmcsread(PROCB_CTLS);
}
runcmd(vmx);
if(vmx->state == VMXRUNNING){
procbctls = defprocbctls;
if((vmx->onentry & STEP) != 0)
defprocbctls |= PROCB_MONTRAP;
if((vmx->onentry & POSTEX) != 0){
vmcswrite(VMENTRY_INTRINFO, vmx->exc.info);
vmcswrite(VMENTRY_INTRCODE, vmx->exc.code);
vmcswrite(VMENTRY_INTRILEN, vmx->exc.ilen);
vmx->onentry &= ~POSTEX;
}
if((vmx->onentry & POSTIRQ) != 0 && (vmx->onentry & STEP) == 0){
if((vmx->onentry & POSTEX) == 0 && (vmcsread(GUEST_RFLAGS) & 1<<9) != 0 && (vmcsread(GUEST_CANINTR) & 3) == 0){
vmcswrite(VMENTRY_INTRINFO, vmx->irq.info);
vmcswrite(VMENTRY_INTRCODE, vmx->irq.code);
vmcswrite(VMENTRY_INTRILEN, vmx->irq.ilen);
vmx->onentry &= ~POSTIRQ;
vmx->got |= GOTIRQACK;
vmx->irqack = vmx->irq;
}else
procbctls |= PROCB_IRQWIN;
}
if((vmx->onentry & FLUSHVPID) != 0){
if(invvpid(INVLOCAL, vmx->vpid, 0) < 0)
error("invvpid failed");
vmx->onentry &= ~FLUSHVPID;
}
if((vmx->onentry & FLUSHEPT) != 0){
if(invept(INVLOCAL, PADDR(vmx->pml4) | 3<<3, 0) < 0)
error("invept failed");
vmx->onentry &= ~FLUSHEPT;
}
vmcswrite(PROCB_CTLS, procbctls);
vmx->got &= ~GOTEXIT;
x = splhi();
if(sizeof(uintptr) == 8){
rdmsr(FSbase, &v);
vmwrite(HOST_FSBASE, v);
}
if((vmx->dr[7] & ~0xd400) != 0)
putdr01236(vmx->dr);
fprestore(&vmx->fp);
if(m->xcr0 != 0 && vmx->xcr0 != m->xcr0)
putxcr0(vmx->xcr0);
if(vmx->cr2 != getcr2())
putcr2(vmx->cr2);
cycles(&start);
if(useend){
vmx->tscoffset -= end - start + adj;
vmcswrite(VMCS_TSC_OFFSET, vmx->tscoffset);
}
if(adj == 0){
cycles(&adj);
adj -= start;
}
rc = vmlaunch(&vmx->ureg, vmx->launched);
cycles(&end);
useend = vmx->procbctls & PROCB_TSCOFFSET;
vmx->cr2 = getcr2();
if(m->xcr0 != 0 && vmx->xcr0 != m->xcr0)
putxcr0(m->xcr0);
fpsave(&vmx->fp);
splx(x);
if(rc < 0)
error("vmlaunch failed");
vmx->launched = 1;
processexit(vmx);
}else{
up->psstate = "Idle";
sleep(&vmx->cmdwait, gotcmd, vmx);
up->psstate = nil;
}
}
}
enum {
/* Qdir */
Qclone = 1,
};
enum {
Qdir,
Qctl,
Qregs,
Qstatus,
Qmap,
Qwait,
Qfpregs,
};
static Dirtab vmxdir[] = {
"ctl", { Qctl, 0, 0 }, 0, 0660,
"regs", { Qregs, 0, 0 }, 0, 0660,
"status", { Qstatus, 0, 0 }, 0, 0440,
"map", { Qmap, 0, 0 }, 0, 0660,
"wait", { Qwait, 0, 0 }, 0, 0440,
"fpregs", { Qfpregs, 0, 0 }, 0, 0660,
};
enum {
CMquit,
CMgo,
CMstop,
CMstep,
CMexc,
CMirq,
CMextrap,
};
static Cmdtab vmxctlmsg[] = {
CMquit, "quit", 1,
CMgo, "go", 0,
CMstop, "stop", 1,
CMstep, "step", 0,
CMexc, "exc", 2,
CMirq, "irq", 0,
CMextrap, "extrap", 2,
};
enum { AUXSIZE = 4096 };
static Vmx *
vmxlook(vlong n)
{
if(n < 0) return nil;
if(n >= nvmxtab) return nil;
return vmxtab[n];
}
#define QIDPATH(q,e) ((q) + 1 << 8 | (e))
#define SLOT(q) ((vlong)((q).path >> 8) - 1)
#define FILE(q) ((int)(q).path & 0xff)
static Vmx *
vmxent(Qid q)
{
Vmx *vmx;
eqlock(&vmxtablock);
if(waserror()){
qunlock(&vmxtablock);
nexterror();
}
vmx = vmxlook(SLOT(q));
qunlock(&vmxtablock);
poperror();
return vmx;
}
static int
iscmddone(void *cp)
{
return (((VmCmd*)cp)->flags & CMDFDONE) != 0;
}
static int
vmxcmd(Vmx *vmx, int (*f)(VmCmd *, va_list), ...)
{
VmCmd cmd;
if(vmx->state == VMXENDING)
ending:
error(Equit);
memset(&cmd, 0, sizeof(VmCmd));
cmd.vmx = vmx;
cmd.errstr = up->errstr;
cmd.cmd = f;
va_start(cmd.va, f);
ilock(&vmx->cmdlock);
if(vmx->state == VMXENDING){
iunlock(&vmx->cmdlock);
goto ending;
}
*vmx->lastcmd = &cmd;
vmx->lastcmd = &cmd.next;
iunlock(&vmx->cmdlock);
while(waserror())
cmd.scratched = 1;
wakeup(&vmx->cmdwait);
do
sleep(&cmd, iscmddone, &cmd);
while(!iscmddone(&cmd));
poperror();
lock(&cmd);
unlock(&cmd);
if((cmd.flags & CMDFFAIL) != 0)
error(up->errstr);
return cmd.retval;
}
static Vmx *
vmxnew(void)
{
Vmx *vmx;
Vmx **newtab;
int i, mi, mv;
vmx = mallocalign(sizeof(Vmx), 4096, 0, 0);
if(waserror()){
free(vmx);
nexterror();
}
memset(vmx, 0, sizeof(Vmx));
vmx->state = VMXINIT;
vmx->lastcmd = &vmx->firstcmd;
vmx->mem.next = &vmx->mem;
vmx->mem.prev = &vmx->mem;
vmx->index = -1;
eqlock(&vmxtablock);
if(waserror()){
if(vmx->index >= 0)
vmxtab[vmx->index] = 0;
qunlock(&vmxtablock);
nexterror();
}
for(i = 0; i < nvmxtab; i++)
if(vmxtab[i] == nil){
vmxtab[i] = vmx;
vmx->index = i;
break;
}
if(i == nvmxtab){
newtab = realloc(vmxtab, (nvmxtab + 1) * sizeof(Vmx *));
if(newtab == nil)
error(Enomem);
vmxtab = newtab;
vmxtab[nvmxtab] = vmx;
vmx->index = nvmxtab++;
}
kproc("kvmx", vmxproc, vmx);
qunlock(&vmxtablock);
poperror();
poperror();
mi = 0;
mv = 0x7fffffff;
for(i = 0; i < conf.nmach; i++)
if(vmxmachp(i)->vms < mv){
mi = i;
mv = vmxmachp(i)->vms;
}
vmx->machno = mi;
if(vmxcmd(vmx, cmdstatus, up->errstr) == VMXDEAD)
error(up->errstr);
return vmx;
}
void
vmxshutdown(void)
{
int i;
for(i = 0; i < nvmxtab; i++)
if(vmxtab[i] != nil)
vmxcmd(vmxtab[i], cmdquit);
}
static Chan *
vmxattach(char *spec)
{
if(!gotvmx) error(Enodev);
return devattach('X', spec);
}
static int
vmxgen(Chan *c, char *, Dirtab *, int, int s, Dir *dp)
{
Dirtab *tab;
int path;
if(s == DEVDOTDOT){
devdir(c, (Qid){Qdir, 0, QTDIR}, "#X", 0, eve, 0555, dp);
return 1;
}
if(c->qid.path == Qdir){
if(s-- == 0) goto clone;
if(s >= nvmxtab)
return -1;
if(vmxlook(s) == nil)
return 0;
sprint(up->genbuf, "%d", s);
devdir(c, (Qid){QIDPATH(s, Qdir), 0, QTDIR}, up->genbuf, 0, eve, DMDIR|0555, dp);
return 1;
}
if(c->qid.path == Qclone){
clone:
strcpy(up->genbuf, "clone");
devdir(c, (Qid){Qclone, 0, QTFILE}, up->genbuf, 0, eve, 0444, dp);
return 1;
}
if(s >= nelem(vmxdir))
return -1;
tab = &vmxdir[s];
path = QIDPATH(SLOT(c->qid), 0);
devdir(c, (Qid){tab->qid.path|path, tab->qid.vers, tab->qid.type}, tab->name, tab->length, eve, tab->perm, dp);
return 1;
}
static Walkqid*
vmxwalk(Chan *c, Chan *nc, char **name, int nname)
{
Walkqid *rc;
eqlock(&vmxtablock);
if(waserror()){
qunlock(&vmxtablock);
nexterror();
}
rc = devwalk(c, nc, name, nname, nil, 0, vmxgen);
qunlock(&vmxtablock);
poperror();
return rc;
}
static int
vmxstat(Chan *c, uchar *dp, int n)
{
int rc;
eqlock(&vmxtablock);
if(waserror()){
qunlock(&vmxtablock);
nexterror();
}
rc = devstat(c, dp, n, nil, 0, vmxgen);
qunlock(&vmxtablock);
poperror();
return rc;
}
static Chan*
vmxopen(Chan* c, int omode)
{
Chan *ch;
Vmx *vmx;
if(c->qid.path == Qclone){
if(!iseve()) error(Eperm);
vmx = vmxnew();
c->qid.path = QIDPATH(vmx->index, Qctl);
}
eqlock(&vmxtablock);
if(waserror()){
qunlock(&vmxtablock);
nexterror();
}
vmx = vmxlook(SLOT(c->qid));
if(SLOT(c->qid) >= 0 && vmx == nil) error(Enonexist);
if(FILE(c->qid) != Qdir && !iseve()) error(Eperm);
ch = devopen(c, omode, nil, 0, vmxgen);
qunlock(&vmxtablock);
poperror();
ch->aux = smalloc(AUXSIZE);
if(SLOT(ch->qid) >= 0 && FILE(ch->qid) == Qmap){
if((omode & OTRUNC) != 0)
vmxcmd(vmx, cmdclearmeminfo);
}
return ch;
}
static void
vmxclunk(Chan *ch)
{
free(ch->aux);
ch->aux = nil;
}
static void
vmxremove(Chan *ch)
{
Vmx *vmx, *old;
vmxclunk(ch);
if(SLOT(ch->qid) == -1 || FILE(ch->qid) != Qctl)
error(Eperm);
vmx = vmxent(ch->qid);
if(vmx == nil)
error(Enonexist);
qlock(&vmxtablock);
old = moribund;
moribund = vmx;
qunlock(&vmxtablock);
if(old != nil)
vmxcmd(old, cmdquit);
}
static void
vmxclose(Chan *ch)
{
if((ch->flag & CRCLOSE) != 0)
vmxremove(ch);
else
vmxclunk(ch);
}
static long
vmxread(Chan* c, void* a, long n, vlong off)
{
int rc;
Vmx *vmx;
if(SLOT(c->qid) == -1){
switch((int)c->qid.path){
case Qdir:
dirread:
eqlock(&vmxtablock);
if(waserror()){
qunlock(&vmxtablock);
nexterror();
}
rc = devdirread(c, a, n, nil, 0, vmxgen);
qunlock(&vmxtablock);
poperror();
return rc;
default:
error(Egreg);
}
}
vmx = vmxent(c->qid);
if(vmx == nil) error(Enonexist);
switch(FILE(c->qid)){
case Qdir:
goto dirread;
case Qctl:
{
char buf[20];
sprint(buf, "%d", vmx->index);
return readstr(off, a, n, buf);
}
case Qregs:
if(off == 0)
vmxcmd(vmx, cmdgetregs, c->aux, (char *) c->aux + AUXSIZE);
return readstr(off, a, n, c->aux);
case Qmap:
if(off == 0)
vmxcmd(vmx, cmdgetmeminfo, c->aux, (char *) c->aux + AUXSIZE);
return readstr(off, a, n, c->aux);
case Qstatus:
{
char buf[ERRMAX+128];
char errbuf[ERRMAX];
int status;
status = vmx->state;
if(status == VMXDEAD){
vmxcmd(vmx, cmdstatus, errbuf);
snprint(buf, sizeof(buf), "%s %#q\n", statenames[status], errbuf);
}else if(status >= 0 && status < nelem(statenames))
snprint(buf, sizeof(buf), "%s\n", statenames[status]);
else
snprint(buf, sizeof(buf), "%d\n", status);
return readstr(off, a, n, buf);
}
case Qwait:
{
char buf[512];
rc = vmxcmd(vmx, cmdwait, buf, buf + sizeof(buf));
if(rc > n) rc = n;
if(rc > 0) memmove(a, buf, rc);
return rc;
}
case Qfpregs:
{
char buf[sizeof(FPsave)];
vmxcmd(vmx, cmdgetfpregs, buf);
if(n < 0 || off < 0 || off >= sizeof(buf)) n = 0;
else if(off + n > sizeof(buf)) n = sizeof(buf) - off;
if(n != 0) memmove(a, buf + off, n);
return n;
}
default:
error(Egreg);
break;
}
return 0;
}
static long
vmxwrite(Chan* c, void* a, long n, vlong off)
{
Cmdbuf *cb;
Cmdtab *ct;
char *s;
int rc;
Vmx *vmx;
if(SLOT(c->qid) == -1){
switch((int)c->qid.path){
case Qdir:
error(Eperm);
default:
error(Egreg);
}
}
vmx = vmxent(c->qid);
if(vmx == nil) error(Enonexist);
switch(FILE(c->qid)){
case Qdir:
error(Eperm);
case Qctl:
cb = parsecmd(a, n);
if(waserror()){
free(cb);
nexterror();
}
ct = lookupcmd(cb, vmxctlmsg, nelem(vmxctlmsg));
switch(ct->index){
case CMquit:
vmxcmd(vmx, cmdquit);
break;
case CMgo:
case CMstep:
s = nil;
if(cb->nf == 2) kstrdup(&s, cb->f[1]);
else if(cb->nf != 1) error(Ebadarg);
if(waserror()){
free(s);
nexterror();
}
vmxcmd(vmx, cmdgo, ct->index == CMstep, s);
poperror();
free(s);
break;
case CMstop:
vmxcmd(vmx, cmdstop);
break;
case CMexc:
s = nil;
kstrdup(&s, cb->f[1]);
if(waserror()){
free(s);
nexterror();
}
vmxcmd(vmx, cmdexcept, s);
poperror();
free(s);
break;
case CMirq:
s = nil;
if(cb->nf == 2)
kstrdup(&s, cb->f[1]);
if(waserror()){
free(s);
nexterror();
}
vmxcmd(vmx, cmdirq, s);
poperror();
free(s);
break;
case CMextrap:
s = nil;
kstrdup(&s, cb->f[1]);
if(waserror()){
free(s);
nexterror();
}
vmxcmd(vmx, cmdextrap, s);
poperror();
free(s);
break;
default:
error(Egreg);
}
poperror();
free(cb);
break;
case Qmap:
case Qregs:
s = malloc(n+1);
if(s == nil) error(Enomem);
if(waserror()){
free(s);
nexterror();
}
memmove(s, a, n);
s[n] = 0;
rc = vmxcmd(vmx, FILE(c->qid) == Qregs ? cmdsetregs : cmdsetmeminfo, s);
poperror();
free(s);
return rc;
case Qfpregs:
{
char buf[sizeof(FPsave)];
if(n > sizeof(FPsave)) n = sizeof(FPsave);
memmove(buf, a, n);
return vmxcmd(vmx, cmdsetfpregs, buf, n, off);
}
default:
error(Egreg);
break;
}
return n;
}
Dev vmxdevtab = {
'X',
"vmx",
vmxreset,
devinit,
devshutdown,
vmxattach,
vmxwalk,
vmxstat,
vmxopen,
devcreate,
vmxclose,
vmxread,
devbread,
vmxwrite,
devbwrite,
vmxremove,
devwstat,
};