From 831ca6093ca486060721f5c3c74f97b10f3172b9 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Tue, 8 Mar 2011 16:09:51 +0200 Subject: [PATCH] KVM: SVM: Load %gs earlier if CONFIG_X86_32_LAZY_GS=n With CONFIG_CC_STACKPROTECTOR, we need a valid %gs at all times, so disable lazy reload and do an eager reload immediately after the vmexit. Reported-by: IVAN ANGELOV Acked-By: Joerg Roedel Signed-off-by: Avi Kivity --- arch/x86/kvm/svm.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 8d61df4a02c7..6bb15d583e47 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1155,7 +1155,9 @@ static void svm_vcpu_put(struct kvm_vcpu *vcpu) wrmsrl(MSR_KERNEL_GS_BASE, current->thread.gs); load_gs_index(svm->host.gs); #else +#ifdef CONFIG_X86_32_LAZY_GS loadsegment(gs, svm->host.gs); +#endif #endif for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++) wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]); @@ -3649,6 +3651,9 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu) wrmsrl(MSR_GS_BASE, svm->host.gs_base); #else loadsegment(fs, svm->host.fs); +#ifndef CONFIG_X86_32_LAZY_GS + loadsegment(gs, svm->host.gs); +#endif #endif reload_tss(vcpu); -- 2.39.5