diff options
| author | Sigrid Solveig Haflínudóttir <ftrvxmtrx@gmail.com> | 2021-09-13 22:54:05 +0000 |
|---|---|---|
| committer | Sigrid Solveig Haflínudóttir <ftrvxmtrx@gmail.com> | 2021-09-13 22:54:05 +0000 |
| commit | 4f310b8f515e28f44f06554684b349dadcc5b0dd (patch) | |
| tree | cdb71b7dc2c509f58e5e9bec271972b287c7eb35 /sys/src/9/pc/devvmx.c | |
| parent | c7dcc82b0be805717efbe77c98eaadf3ee1e31af (diff) | |
devvmx: skip tsc offset writing if CPU doesn't support it
Diffstat (limited to 'sys/src/9/pc/devvmx.c')
| -rw-r--r-- | sys/src/9/pc/devvmx.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/sys/src/9/pc/devvmx.c b/sys/src/9/pc/devvmx.c index 304f70a43..adf592307 100644 --- a/sys/src/9/pc/devvmx.c +++ b/sys/src/9/pc/devvmx.c @@ -267,6 +267,7 @@ struct Vmx { char errstr[ERRMAX]; Ureg ureg; uvlong tscoffset; + u32int procbctls; uintptr cr2; uintptr xcr0; uintptr dr[8]; /* DR7 is also kept in VMCS */ @@ -962,6 +963,7 @@ vmcsinit(Vmx *vmx) 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; @@ -1062,9 +1064,11 @@ vmcsinit(Vmx *vmx) vmcswrite(VMEXIT_MSRSTADDR, PADDR(vmx->msrguest)); vmcswrite(VMEXIT_MSRLDADDR, PADDR(vmx->msrhost)); vmcswrite(MSR_BITMAP, PADDR(vmx->msrbits)); - - cycles(&vmx->tscoffset); - vmcswrite(VMCS_TSC_OFFSET, vmx->tscoffset); + + if(vmx->procbctls & PROCB_TSCOFFSET){ + cycles(&vmx->tscoffset); + vmcswrite(VMCS_TSC_OFFSET, vmx->tscoffset); + } if(sizeof(uintptr) == 8){ vmxaddmsr(vmx, Star, 0); @@ -1682,7 +1686,7 @@ vmxproc(void *vmxp) } rc = vmlaunch(&vmx->ureg, vmx->launched); cycles(&end); - useend = 1; + useend = vmx->procbctls & PROCB_TSCOFFSET; vmx->cr2 = getcr2(); if(m->xcr0 != 0 && vmx->xcr0 != m->xcr0) putxcr0(m->xcr0); |