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kvm: x86: Add kvm_x86_ops hook that enables XSAVES for guest

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Expose the XSAVES feature to the guest if the kvm_x86_ops say it is
available.

Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Wanpeng Li 2014-12-02 19:21:30 +08:00 committed by Paolo Bonzini
parent 5c404cabd1
commit 55412b2eda
5 changed files with 17 additions and 1 deletions
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1
arch/x86/include/asm/kvm_host.h
View File

@ -771,6 +771,7 @@ struct kvm_x86_ops {
enum x86_intercept_stage stage);
void (*handle_external_intr)(struct kvm_vcpu *vcpu);
bool (*mpx_supported)(void);
bool (*xsaves_supported)(void);
int (*check_nested_events)(struct kvm_vcpu *vcpu, bool external_intr);

1
arch/x86/include/asm/vmx.h
View File

@ -69,6 +69,7 @@
#define SECONDARY_EXEC_PAUSE_LOOP_EXITING 0x00000400
#define SECONDARY_EXEC_ENABLE_INVPCID 0x00001000
#define SECONDARY_EXEC_SHADOW_VMCS 0x00004000
#define SECONDARY_EXEC_XSAVES 0x00100000
#define PIN_BASED_EXT_INTR_MASK 0x00000001

3
arch/x86/kvm/cpuid.c
View File

@ -267,6 +267,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0;
unsigned f_invpcid = kvm_x86_ops->invpcid_supported() ? F(INVPCID) : 0;
unsigned f_mpx = kvm_x86_ops->mpx_supported() ? F(MPX) : 0;
unsigned f_xsaves = kvm_x86_ops->xsaves_supported() ? F(XSAVES) : 0;
/* cpuid 1.edx */
const u32 kvm_supported_word0_x86_features =
@ -322,7 +323,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
/* cpuid 0xD.1.eax */
const u32 kvm_supported_word10_x86_features =
F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1);
F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | f_xsaves;
/* all calls to cpuid_count() should be made on the same cpu */
get_cpu();

6
arch/x86/kvm/svm.c
View File

@ -4127,6 +4127,11 @@ static bool svm_mpx_supported(void)
return false;
}
static bool svm_xsaves_supported(void)
{
return false;
}
static bool svm_has_wbinvd_exit(void)
{
return true;
@ -4414,6 +4419,7 @@ static struct kvm_x86_ops svm_x86_ops = {
.rdtscp_supported = svm_rdtscp_supported,
.invpcid_supported = svm_invpcid_supported,
.mpx_supported = svm_mpx_supported,
.xsaves_supported = svm_xsaves_supported,
.set_supported_cpuid = svm_set_supported_cpuid,

7
arch/x86/kvm/vmx.c
View File

@ -7553,6 +7553,12 @@ static bool vmx_mpx_supported(void)
(vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_BNDCFGS);
}
static bool vmx_xsaves_supported(void)
{
return vmcs_config.cpu_based_2nd_exec_ctrl &
SECONDARY_EXEC_XSAVES;
}
static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx)
{
u32 exit_intr_info;
@ -9329,6 +9335,7 @@ static struct kvm_x86_ops vmx_x86_ops = {
.check_intercept = vmx_check_intercept,
.handle_external_intr = vmx_handle_external_intr,
.mpx_supported = vmx_mpx_supported,
.xsaves_supported = vmx_xsaves_supported,
.check_nested_events = vmx_check_nested_events,