Author: tychon
Date: Fri May 30 23:37:31 2014
New Revision: 266910
URL: http://svnweb.freebsd.org/changeset/base/266910
Log:
If VMX isn't enabled so long as the lock bit isn't set yet in MSR
IA32_FEATURE_CONTROL it still can be.
Approved by: grehan (co-mentor)
Modified:
head/sys/amd64/vmm/intel/vmx.c
Modified: head/sys/amd64/vmm/intel/vmx.c
==============================================================================
--- head/sys/amd64/vmm/intel/vmx.c Fri May 30 23:28:53 2014
(r266909)
+++ head/sys/amd64/vmm/intel/vmx.c Fri May 30 23:37:31 2014
(r266910)
@@ -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);
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