[PATCH v3 2/3] kvm: vmx: add kvm_get/set logic to xsaves

Wanpeng Li
2014-12-02T11:15:54Z

Add kvm_get/set logic to xsaves.

Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com>
---
arch/x86/kvm/vmx.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 12915f1..66d1e3d 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -99,6 +99,8 @@ module_param_named(enable_shadow_vmcs, enable_shadow_vmcs, bool, S_IRUGO);
static bool __read_mostly nested = 0;
module_param(nested, bool, S_IRUGO);

+static u64 __read_mostly host_xss;
+
#define KVM_GUEST_CR0_MASK (X86_CR0_NW | X86_CR0_CD)
#define KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST (X86_CR0_WP | X86_CR0_NE)
#define KVM_VM_CR0_ALWAYS_ON \
@@ -2570,6 +2572,11 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
if (!nested_vmx_allowed(vcpu))
return 1;
return vmx_get_vmx_msr(vcpu, msr_index, pdata);
+ case MSR_IA32_XSS:
+ if (!vmx_xsaves_supported())
+ return 1;
+ data = vcpu->arch.ia32_xss;
+ break;
case MSR_TSC_AUX:
if (!to_vmx(vcpu)->rdtscp_enabled)
return 1;
@@ -2661,6 +2668,16 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
break;
case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC:
return 1; /* they are read-only */
+ case MSR_IA32_XSS:
+ if (!vmx_xsaves_supported())
+ return 1;
+ vcpu->arch.ia32_xss = data;
+ if (vcpu->arch.ia32_xss != host_xss)
+ add_atomic_switch_msr(vmx, MSR_IA32_XSS,
+ vcpu->arch.ia32_xss, host_xss);
+ else
+ clear_atomic_switch_msr(vmx, MSR_IA32_XSS);
+ break;
case MSR_TSC_AUX:
if (!vmx->rdtscp_enabled)
return 1;
@@ -3020,6 +3037,9 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
}
}

+ if (cpu_has_xsaves)
+ rdmsrl(MSR_IA32_XSS, host_xss);
+
return 0;
}

--
1.9.1