Add kvm_get/set logic to xsaves. Signed-off-by: Wanpeng Li <wanpeng.li@xxxxxxxxxxxxxxx> --- arch/x86/kvm/vmx.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 12915f1..ad1153a 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 +2668,22 @@ 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; + /* + * The only supported bit as of Skylake is bit 8, but + * it is not supported on KVM. + */ + if (data != 0) + 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 +3043,9 @@ 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 -- 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
