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vmx: implement long mode page table translation

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This allows vmx to translate virtual addresses to physical
when the gues runs in long mode.
This commit is contained in:
cinap_lenrek 2021-05-12 18:00:46 +02:00
parent 014197f8d3
commit 67eac97a81
1 changed files with 38 additions and 3 deletions
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41
sys/src/cmd/vmx/x86.c
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@ -60,10 +60,44 @@ translatepae(uintptr, uintptr *, int *)
}
static uintptr
translate64(uintptr, uintptr *, int *)
translate64(uintptr va, uintptr *pa, int *perm)
{
vmerror("long mode translation not implemented");
return 0;
void *pml4, *pdp, *pd, *pt;
u64int pml4e, pdpe, pde, pte;
pml4 = gptr(rget("cr3") & 0xffffffffff000ULL, 4096);
if(pml4 == nil) return 0;
pml4e = GET64(pml4, (va & (511ULL<<39)) >> (39-3));
if(perm != nil) *perm = pml4e & 15;
if((pml4e & 1) == 0) return 0;
pdp = gptr(pml4e & 0xffffffffff000ULL, 4096);
if(pdp == nil) return 0;
pdpe = GET64(pdp, (va & (511ULL<<30)) >> (30-3));
if((pdpe & 1) == 0) return 0;
if(perm != nil) *perm &= pdpe;
if((pdpe & 0x80) != 0){
*pa = (pdpe & 0xfffffc0000000ULL) | (va & 0x3fffffffULL);
return 0x40000000ULL - (va & 0x3fffffffULL);
}
pd = gptr(pdpe & 0xffffffffff000ULL, 4096);
if(pd == nil) return 0;
pde = GET64(pd, (va & (511ULL<<21)) >> (21-3));
if((pde & 1) == 0) return 0;
if(perm != nil) *perm &= pde;
if((pde & 0x80) != 0){
*pa = (pde & 0xfffffffe00000ULL) | (va & 0x1fffffULL);
return 0x200000ULL - (va & 0x1fffffULL);
}
pt = gptr(pde & 0xffffffffff000ULL, 4096);
if(pt == nil) return 0;
pte = GET64(pt, (va & (511ULL<<12)) >> (12-3));
if((pte & 1) == 0) return 0;
if(perm != nil) *perm &= pte;
*pa = (pte & 0xffffffffff000ULL) | (va & 0xfffULL);
return 0x1000ULL - (va & 0xfffULL);
}
static uintptr (*
@ -229,6 +263,7 @@ x86access(int seg, uintptr addr0, int asz, uvlong *val, int sz, int acc, TLB *tl
cpl = rget("cs") & 3;
wp = (rget("cr0real") & 1<<16) != 0;
for(i = 0; i < sz; ){
pperm = 0;
l = translator()(addr+i, &pav, &pperm);
if(l == 0){
pf: