KVM: SVM: do not set MSR_TSC_AUX on 32-bit builds

[cascardo/linux.git] / arch / x86 / kvm / svm.c

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 8a3c571..05c08b6 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -41,6 +41,7 @@
 #include <asm/desc.h>
 #include <asm/debugreg.h>
 #include <asm/kvm_para.h>
+#include <asm/vgtod.h>
 
 #include <asm/virtext.h>
 #include "trace.h"
@@ -238,7 +239,9 @@ module_param(nested, int, S_IRUGO);
 
 /* enable / disable AVIC */
 static int avic;
+#ifdef CONFIG_X86_LOCAL_APIC
 module_param(avic, int, S_IRUGO);
+#endif
 
 static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
 static void svm_flush_tlb(struct kvm_vcpu *vcpu);
@@ -981,11 +984,14 @@ static __init int svm_hardware_setup(void)
        } else
                kvm_disable_tdp();
 
-       if (avic && (!npt_enabled || !boot_cpu_has(X86_FEATURE_AVIC)))
-               avic = false;
-
-       if (avic)
-               pr_info("AVIC enabled\n");
+       if (avic) {
+               if (!npt_enabled ||
+                   !boot_cpu_has(X86_FEATURE_AVIC) ||
+                   !IS_ENABLED(CONFIG_X86_LOCAL_APIC))
+                       avic = false;
+               else
+                       pr_info("AVIC enabled\n");
+       }
 
        return 0;
 
@@ -1525,9 +1531,6 @@ static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
                        wrmsrl(MSR_AMD64_TSC_RATIO, tsc_ratio);
                }
        }
-       /* This assumes that the kernel never uses MSR_TSC_AUX */
-       if (static_cpu_has(X86_FEATURE_RDTSCP))
-               wrmsrl(MSR_TSC_AUX, svm->tsc_aux);
 
        avic_vcpu_load(vcpu, cpu);
 }
@@ -4469,6 +4472,8 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu)
        svm->vmcb->save.cr2 = vcpu->arch.cr2;
 
        clgi();
+       if (static_cpu_has(X86_FEATURE_RDTSCP))
+               wrmsrl(MSR_TSC_AUX, svm->tsc_aux);
 
        local_irq_enable();
 
@@ -4546,6 +4551,8 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu)
                );
 
 #ifdef CONFIG_X86_64
+       if (static_cpu_has(X86_FEATURE_RDTSCP))
+               wrmsrl(MSR_TSC_AUX, __getcpu());
        wrmsrl(MSR_GS_BASE, svm->host.gs_base);
 #else
        loadsegment(fs, svm->host.fs);