From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932482AbeCLOES (ORCPT ); Mon, 12 Mar 2018 10:04:18 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:45846 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751985AbeCLODG (ORCPT ); Mon, 12 Mar 2018 10:03:06 -0400 From: Vitaly Kuznetsov To: kvm@vger.kernel.org, x86@kernel.org Cc: linux-kernel@vger.kernel.org, Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Andy Lutomirski Subject: [PATCH 2/3] x86/kvm/vmx: read MSR_KERNEL_GS_BASE from current->thread Date: Mon, 12 Mar 2018 15:02:59 +0100 Message-Id: <20180312140300.6166-3-vkuznets@redhat.com> In-Reply-To: <20180312140300.6166-1-vkuznets@redhat.com> References: <20180312140300.6166-1-vkuznets@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org vmx_save_host_state() is only called from kvm_arch_vcpu_ioctl_run() so the context is pretty well defined and as we're past 'swapgs' MSR_KERNEL_GS_BASE is equal to current->thread.gsbase (after previous save_current_fsgs() call). Signed-off-by: Vitaly Kuznetsov --- arch/x86/kvm/vmx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index e46b7b24ebae..d4d9bb2fd91e 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2167,7 +2167,7 @@ static void vmx_save_host_state(struct kvm_vcpu *vcpu) #endif #ifdef CONFIG_X86_64 - rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base); + vmx->msr_host_kernel_gs_base = current->thread.gsbase; if (is_long_mode(&vmx->vcpu)) wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base); #endif -- 2.14.3