Expose intel xsaves feature to guest.
Signed-off-by: Wanpeng Li <wanpeng.li@xxxxxxxxxxxxxxx>
---
v1 -> v2:
*auto switch msr ia32_xss if this msr is present
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/include/asm/vmx.h | 3 +++
arch/x86/include/uapi/asm/vmx.h | 6 +++++-
arch/x86/kvm/vmx.c | 35 ++++++++++++++++++++++++++++++++++-
4 files changed, 43 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 2896dbc..95dde42 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -362,6 +362,7 @@ struct kvm_vcpu_arch {
int mp_state;
u64 ia32_misc_enable_msr;
bool tpr_access_reporting;
+ u64 ia32_xss;
/*
* Paging state of the vcpu
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index bcbfade..bdb79ef 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -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
@@ -159,6 +160,8 @@ enum vmcs_field {
EOI_EXIT_BITMAP3_HIGH = 0x00002023,
VMREAD_BITMAP = 0x00002026,
VMWRITE_BITMAP = 0x00002028,
+ XSS_EXIT_BIMTAP = 0x0000202C,
+ XSS_EXIT_BIMTAP_HIGH = 0x0000202D,
GUEST_PHYSICAL_ADDRESS = 0x00002400,
GUEST_PHYSICAL_ADDRESS_HIGH = 0x00002401,
VMCS_LINK_POINTER = 0x00002800,
diff --git a/arch/x86/include/uapi/asm/vmx.h b/arch/x86/include/uapi/asm/vmx.h
index 990a2fe..b813bf9 100644
--- a/arch/x86/include/uapi/asm/vmx.h
+++ b/arch/x86/include/uapi/asm/vmx.h
@@ -72,6 +72,8 @@
#define EXIT_REASON_XSETBV 55
#define EXIT_REASON_APIC_WRITE 56
#define EXIT_REASON_INVPCID 58
+#define EXIT_REASON_XSAVES 63
+#define EXIT_REASON_XRSTORS 64
#define VMX_EXIT_REASONS \
{ EXIT_REASON_EXCEPTION_NMI, "EXCEPTION_NMI" }, \
@@ -116,6 +118,8 @@
{ EXIT_REASON_INVALID_STATE, "INVALID_STATE" }, \
{ EXIT_REASON_INVD, "INVD" }, \
{ EXIT_REASON_INVVPID, "INVVPID" }, \
- { EXIT_REASON_INVPCID, "INVPCID" }
+ { EXIT_REASON_INVPCID, "INVPCID" }, \
+ { EXIT_REASON_XSAVES, "XSAVES" }, \
+ { EXIT_REASON_XRSTORS, "XRSTORS" }
#endif /* _UAPIVMX_H */
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 6a951d8..b87b5b8 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1045,6 +1045,12 @@ static inline bool cpu_has_vmx_invpcid(void)
SECONDARY_EXEC_ENABLE_INVPCID;
}
+static inline bool cpu_has_xss_exit_bitmap(void)
+{
+ return vmcs_config.cpu_based_2nd_exec_ctrl &
+ SECONDARY_EXEC_XSAVES;
+}
+
static inline bool cpu_has_virtual_nmis(void)
{
return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS;
@@ -1773,6 +1779,14 @@ static void vmx_save_host_state(struct kvm_vcpu *vcpu)
kvm_set_shared_msr(vmx->guest_msrs[i].index,
vmx->guest_msrs[i].data,
vmx->guest_msrs[i].mask);
+
+ if (cpu_has_xsaves) {
+ u64 host_xss;
+
+ rdmsrl(MSR_IA32_XSS, host_xss);
+ add_atomic_switch_msr(vmx, MSR_IA32_XSS,
+ vcpu->arch.ia32_xss, host_xss);
+ }
}
static void __vmx_load_host_state(struct vcpu_vmx *vmx)
@@ -2895,7 +2909,8 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
SECONDARY_EXEC_ENABLE_INVPCID |
SECONDARY_EXEC_APIC_REGISTER_VIRT |
SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |
- SECONDARY_EXEC_SHADOW_VMCS;
+ SECONDARY_EXEC_SHADOW_VMCS |
+ SECONDARY_EXEC_XSAVES;
if (adjust_vmx_controls(min2, opt2,
MSR_IA32_VMX_PROCBASED_CTLS2,
&_cpu_based_2nd_exec_control) < 0)
@@ -4346,6 +4361,7 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
unsigned long a;
#endif
int i;
+ u64 xss = 0;
/* I/O */
vmcs_write64(IO_BITMAP_A, __pa(vmx_io_bitmap_a));
@@ -4446,6 +4462,9 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
set_cr4_guest_host_mask(vmx);
+ if (cpu_has_xss_exit_bitmap())
+ vmcs_write64(XSS_EXIT_BIMTAP, xss);
+
return 0;
}
@@ -5334,6 +5353,18 @@ static int handle_xsetbv(struct kvm_vcpu *vcpu)
return 1;
}
+static int handle_xsaves(struct kvm_vcpu *vcpu)
+{
+ skip_emulated_instruction(vcpu);
+ return 1;
+}
+
+static int handle_xrstors(struct kvm_vcpu *vcpu)
+{
+ skip_emulated_instruction(vcpu);
+ return 1;
+}
+
static int handle_apic_access(struct kvm_vcpu *vcpu)
{
if (likely(fasteoi)) {
@@ -6951,6 +6982,8 @@ static int (*const kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
[EXIT_REASON_MONITOR_INSTRUCTION] = handle_monitor,
[EXIT_REASON_INVEPT] = handle_invept,
[EXIT_REASON_INVVPID] = handle_invvpid,
+ [EXIT_REASON_XSAVES] = handle_xsaves,
+ [EXIT_REASON_XRSTORS] = handle_xrstors,
};
static const int kvm_vmx_max_exit_handlers =
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
