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If VMX isn't enabled so long as the lock bit isn't set yet in MSR

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IA32_FEATURE_CONTROL it still can be.

Approved by:	grehan (co-mentor)
This commit is contained in:
Tycho Nightingale 2014-05-30 23:37:31 +00:00
parent 368541ba1e
commit 11669a681c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=266910
1 changed files with 10 additions and 1 deletions
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11
sys/amd64/vmm/intel/vmx.c
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@ -512,6 +512,15 @@ static void
vmx_enable(void *arg __unused)
{
int error;
uint64_t feature_control;
feature_control = rdmsr(MSR_IA32_FEATURE_CONTROL);
if ((feature_control & IA32_FEATURE_CONTROL_LOCK) == 0 ||
(feature_control & IA32_FEATURE_CONTROL_VMX_EN) == 0) {
wrmsr(MSR_IA32_FEATURE_CONTROL,
feature_control | IA32_FEATURE_CONTROL_VMX_EN |
IA32_FEATURE_CONTROL_LOCK);
}
load_cr4(rcr4() | CR4_VMXE);
@ -547,7 +556,7 @@ vmx_init(int ipinum)
* are set (bits 0 and 2 respectively).
*/
feature_control = rdmsr(MSR_IA32_FEATURE_CONTROL);
if ((feature_control & IA32_FEATURE_CONTROL_LOCK) == 0 ||
if ((feature_control & IA32_FEATURE_CONTROL_LOCK) == 1 &&
(feature_control & IA32_FEATURE_CONTROL_VMX_EN) == 0) {
printf("vmx_init: VMX operation disabled by BIOS\n");
return (ENXIO);