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KVM: SVM: move has_svm() code to asm/virtext.h

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Use a trick to keep the printk()s on has_svm() working as before. gcc
will take care of not generating code for the 'msg' stuff when the
function is called with a NULL msg argument.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Eduardo Habkost 2008-11-17 19:03:20 -02:00 committed by Avi Kivity
parent 6aa07a0d77
commit 63d1142f8f
2 changed files with 46 additions and 14 deletions
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41
arch/x86/include/asm/virtext.h
View File

@ -19,6 +19,7 @@
#include <asm/system.h>
#include <asm/vmx.h>
#include <asm/svm.h>
/*
* VMX functions:
@ -66,4 +67,44 @@ static inline void cpu_emergency_vmxoff(void)
__cpu_emergency_vmxoff();
}
/*
* SVM functions:
*/
/** Check if the CPU has SVM support
*
* You can use the 'msg' arg to get a message describing the problem,
* if the function returns zero. Simply pass NULL if you are not interested
* on the messages; gcc should take care of not generating code for
* the messages on this case.
*/
static inline int cpu_has_svm(const char **msg)
{
uint32_t eax, ebx, ecx, edx;
if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) {
if (msg)
*msg = "not amd";
return 0;
}
cpuid(0x80000000, &eax, &ebx, &ecx, &edx);
if (eax < SVM_CPUID_FUNC) {
if (msg)
*msg = "can't execute cpuid_8000000a";
return 0;
}
cpuid(0x80000001, &eax, &ebx, &ecx, &edx);
if (!(ecx & (1 << SVM_CPUID_FEATURE_SHIFT))) {
if (msg)
*msg = "svm not available";
return 0;
}
return 1;
}
#endif /* _ASM_X86_VIRTEX_H */

19
arch/x86/kvm/svm.c
View File

@ -28,6 +28,8 @@
#include <asm/desc.h>
#include <asm/virtext.h>
#define __ex(x) __kvm_handle_fault_on_reboot(x)
MODULE_AUTHOR("Qumranet");
@ -245,24 +247,13 @@ static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
static int has_svm(void)
{
uint32_t eax, ebx, ecx, edx;
const char *msg;
if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) {
printk(KERN_INFO "has_svm: not amd\n");
if (!cpu_has_svm(&msg)) {
printk(KERN_INFO "has_svn: %s\n", msg);
return 0;
}
cpuid(0x80000000, &eax, &ebx, &ecx, &edx);
if (eax < SVM_CPUID_FUNC) {
printk(KERN_INFO "has_svm: can't execute cpuid_8000000a\n");
return 0;
}
cpuid(0x80000001, &eax, &ebx, &ecx, &edx);
if (!(ecx & (1 << SVM_CPUID_FEATURE_SHIFT))) {
printk(KERN_DEBUG "has_svm: svm not available\n");
return 0;
}
return 1;
}