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add the support for the MSR IA32_FEATURE_CONTROL

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- this MSR controlls the usage of VMXON
- per dedault HermitCore allows the usage of VMXON outside of SMX
This commit is contained in:
Stefan Lankes 2015-12-08 22:55:56 +01:00
parent b36e758e9e
commit 82c6dd1e23
2 changed files with 7 additions and 1 deletions
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1
hermit/arch/x86/include/asm/processor.h
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@ -195,6 +195,7 @@ extern "C" {
#define MSR_KERNEL_GS_BASE 0xc0000102
#define MSR_IA32_MISC_ENABLE 0x000001a0
#define MSR_IA32_FEATURE_CONTROL 0x0000003a
// MSR EFER bits
#define EFER_SCE (1 << 0)

7
hermit/arch/x86/kernel/processor.c
View file

@ -318,6 +318,9 @@ int cpu_detection(void) {
if (has_nx())
wrmsr(MSR_EFER, rdmsr(MSR_EFER) | EFER_NXE);
if (has_vmx())
wrmsr(MSR_IA32_FEATURE_CONTROL, rdmsr(MSR_IA32_FEATURE_CONTROL) | 0x5);
writefs(0);
#if MAX_CORES > 1
writegs(atomic_int32_read(&current_boot_id) * ((size_t) &percore_end0 - (size_t) &percore_start));
@ -417,8 +420,10 @@ int cpu_detection(void) {
if (first_time) {
kprintf("CR0 0x%llx, CR4 0x%llx\n", read_cr0(), read_cr4());
kprintf("size of xsave_t: %d\n", sizeof(xsave_t));
if (has_msr())
if (has_msr()) {
kprintf("IA32_MISC_ENABLE 0x%llx\n", rdmsr(MSR_IA32_MISC_ENABLE));
kprintf("IA32_FEATURE_CONTROL 0x%llx\n", rdmsr(MSR_IA32_FEATURE_CONTROL));
}
}
return 0;