[PATCH v14 01/13] KVM: x86: Report XSS as an MSR to be saved if there are supported features

[Yang Weijiang]

From: Sean Christopherson <sean.j.christopher...@intel.com>

Add MSR_IA32_XSS to the list of MSRs reported to userspace if
supported_xss is non-zero, i.e. KVM supports at least one XSS based
feature.

Signed-off-by: Sean Christopherson <sean.j.christopher...@intel.com>
---
 arch/x86/kvm/x86.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 397f599b20e5..fce18a2537ea 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1237,6 +1237,8 @@ static const u32 msrs_to_save_all[] = {
        MSR_ARCH_PERFMON_EVENTSEL0 + 12, MSR_ARCH_PERFMON_EVENTSEL0 + 13,
        MSR_ARCH_PERFMON_EVENTSEL0 + 14, MSR_ARCH_PERFMON_EVENTSEL0 + 15,
        MSR_ARCH_PERFMON_EVENTSEL0 + 16, MSR_ARCH_PERFMON_EVENTSEL0 + 17,
+
+       MSR_IA32_XSS,
 };
 
 static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_all)];
@@ -5728,6 +5730,10 @@ static void kvm_init_msr_list(void)
                            min(INTEL_PMC_MAX_GENERIC, x86_pmu.num_counters_gp))
                                continue;
                        break;
+               case MSR_IA32_XSS:
+                       if (!supported_xss)
+                               continue;
+                       break;
                default:
                        break;
                }
-- 
2.17.2