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Simple get_vmx_cap()

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Don't check MSR Control Features in get_vmx_cap

Signed-off-by: Li, Fei1 <fei1.li@intel.com>
This commit is contained in:
Li, Fei1 2018-03-08 21:14:24 +08:00 committed by Jack Ren
parent 05b8f366f6
commit 4f65dd477a
3 changed files with 5 additions and 28 deletions
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27
arch/x86/vmx.c
View File

@ -94,38 +94,15 @@ static inline int exec_vmxon(void *addr)
return status; return status;
} }
int check_vmx_support(void) bool get_vmx_cap(void)
{ {
uint32_t eax, ebx, ecx, edx; uint32_t eax, ebx, ecx, edx;
int ret_val = 0;
uint64_t tmp64;
/* Run CPUID to determine if VTX support available */ /* Run CPUID to determine if VTX support available */
cpuid(CPUID_FEATURES, &eax, &ebx, &ecx, &edx); cpuid(CPUID_FEATURES, &eax, &ebx, &ecx, &edx);
/* See if VMX feature bit is set in ECX */ /* See if VMX feature bit is set in ECX */
if (!(ecx & CPUID_ECX_VMX)) { return !!(ecx & CPUID_ECX_VMX);
/* Log and return error */
pr_fatal("VMX not supported by CPU");
ret_val = -EINVAL;
} else {
/* Read feature control MSR */
tmp64 = msr_read(MSR_IA32_FEATURE_CONTROL);
/* See if feature control MSR is locked and VMX not enabled
* appropriately
*/
if ((tmp64 & MSR_IA32_FEATURE_CONTROL_LOCK) &&
(!(tmp64 & MSR_IA32_FEATURE_CONTROL_VMX_NO_SMX))) {
/* Log and return error */
pr_fatal("MSR_IA32_FEATURE_CONTROL: Lock bit is on and VMXON bit is off");
pr_fatal(" Cannot do vmxon");
ret_val = -EINVAL;
}
}
/* Return status to caller */
return ret_val;
} }
int exec_vmxon_instr(void) int exec_vmxon_instr(void)

4
common/hv_main.c
View File

@ -152,8 +152,8 @@ int hv_main(int cpu_id)
"cpu_id/tsc_aux mismatch"); "cpu_id/tsc_aux mismatch");
/* Check if virtualization extensions are supported */ /* Check if virtualization extensions are supported */
ret = check_vmx_support(); ret = get_vmx_cap();
ASSERT(ret == 0, "VMX not supported!"); ASSERT(ret == 1, "VMX not supported!");
/* Enable virtualization extensions */ /* Enable virtualization extensions */
ret = exec_vmxon_instr(); ret = exec_vmxon_instr();

2
include/arch/x86/vmx.h
View File

@ -413,7 +413,7 @@
#define PAGE_PROTECTED_MODE 2 #define PAGE_PROTECTED_MODE 2
/* External Interfaces */ /* External Interfaces */
int check_vmx_support(void); bool get_vmx_cap(void);
int exec_vmxon_instr(void); int exec_vmxon_instr(void);
uint64_t exec_vmread(uint32_t field); uint64_t exec_vmread(uint32_t field);
uint64_t exec_vmread64(uint32_t field_full); uint64_t exec_vmread64(uint32_t field_full);