KVM: VMX: Enable XSAVE/XRSTOR for guest
This patch enable guest to use XSAVE/XRSTOR instructions.
We assume that host_xcr0 would use all possible bits that OS supported.
And we loaded xcr0 in the same way we handled fpu - do it as late as we can.
Signed-off-by: Dexuan Cui <dexuan.cui@intel.com>
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 26ba61d..864a1b6 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -37,6 +37,8 @@
#include <asm/vmx.h>
#include <asm/virtext.h>
#include <asm/mce.h>
+#include <asm/i387.h>
+#include <asm/xcr.h>
#include "trace.h"
@@ -3390,6 +3392,16 @@
return 1;
}
+static int handle_xsetbv(struct kvm_vcpu *vcpu)
+{
+ u64 new_bv = kvm_read_edx_eax(vcpu);
+ u32 index = kvm_register_read(vcpu, VCPU_REGS_RCX);
+
+ if (kvm_set_xcr(vcpu, index, new_bv) == 0)
+ skip_emulated_instruction(vcpu);
+ return 1;
+}
+
static int handle_apic_access(struct kvm_vcpu *vcpu)
{
return emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DONE;
@@ -3668,6 +3680,7 @@
[EXIT_REASON_TPR_BELOW_THRESHOLD] = handle_tpr_below_threshold,
[EXIT_REASON_APIC_ACCESS] = handle_apic_access,
[EXIT_REASON_WBINVD] = handle_wbinvd,
+ [EXIT_REASON_XSETBV] = handle_xsetbv,
[EXIT_REASON_TASK_SWITCH] = handle_task_switch,
[EXIT_REASON_MCE_DURING_VMENTRY] = handle_machine_check,
[EXIT_REASON_EPT_VIOLATION] = handle_ept_violation,
