From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753422AbdJHCfT (ORCPT ); Sat, 7 Oct 2017 22:35:19 -0400 Received: from mail-pf0-f195.google.com ([209.85.192.195]:38578 "EHLO mail-pf0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750981AbdJHCfO (ORCPT ); Sat, 7 Oct 2017 22:35:14 -0400 X-Google-Smtp-Source: AOwi7QAOVWM4qn7/KfnuAxvTe1ceIAXPPxwQsVeQVGvVNPldiDEMHXgzLGCZ3z+fBw4sYslGKHigqg== From: Wanpeng Li X-Google-Original-From: Wanpeng Li To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Wanpeng Li Subject: [PATCH 2/2] KVM: X86: XCR0 should be set to the fixed value on vCPU reset Date: Sat, 7 Oct 2017 19:35:07 -0700 Message-Id: <1507430107-4338-2-git-send-email-wanpeng.li@hotmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1507430107-4338-1-git-send-email-wanpeng.li@hotmail.com> References: <1507430107-4338-1-git-send-email-wanpeng.li@hotmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Wanpeng Li SDM section 2.6 mentioned: After reset, all bits (except bit 0) in XCR0 are cleared to zero; XCR0[0] is set to 1. This patch sets XCRO to the 0x1 after vCPU reset. Cc: Paolo Bonzini Cc: Radim Krčmář Signed-off-by: Wanpeng Li --- arch/x86/kvm/x86.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index b0d2915..c784cd6 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -7816,6 +7816,8 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) vcpu->arch.regs_avail = ~0; vcpu->arch.regs_dirty = ~0; + vcpu->arch.xcr0 = XFEATURE_MASK_FP; + kvm_x86_ops->vcpu_reset(vcpu, init_event); } -- 2.7.4