From: Borislav Petkov Date: Sun, 26 Mar 2017 21:51:24 +0000 (+0200) Subject: kvm/svm: Setup MCG_CAP on AMD properly X-Git-Tag: v4.12-rc1~68^2~67 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=74f169090b6f36b867c9df0454366dd9af6f62d1;p=platform%2Fkernel%2Flinux-exynos.git kvm/svm: Setup MCG_CAP on AMD properly MCG_CAP[63:9] bits are reserved on AMD. However, on an AMD guest, this MSR returns 0x100010a. More specifically, bit 24 is set, which is simply wrong. That bit is MCG_SER_P and is present only on Intel. Thus, clean up the reserved bits in order not to confuse guests. Signed-off-by: Borislav Petkov Cc: Joerg Roedel Cc: Paolo Bonzini Cc: Radim Krčmář Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 5fba706..1b203ab 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -5256,6 +5256,12 @@ static inline void avic_post_state_restore(struct kvm_vcpu *vcpu) avic_handle_ldr_update(vcpu); } +static void svm_setup_mce(struct kvm_vcpu *vcpu) +{ + /* [63:9] are reserved. */ + vcpu->arch.mcg_cap &= 0x1ff; +} + static struct kvm_x86_ops svm_x86_ops __ro_after_init = { .cpu_has_kvm_support = has_svm, .disabled_by_bios = is_disabled, @@ -5367,6 +5373,7 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = { .pmu_ops = &amd_pmu_ops, .deliver_posted_interrupt = svm_deliver_avic_intr, .update_pi_irte = svm_update_pi_irte, + .setup_mce = svm_setup_mce, }; static int __init svm_init(void)