Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752196AbbETCpc (ORCPT ); Tue, 19 May 2015 22:45:32 -0400 Received: from mga09.intel.com ([134.134.136.24]:45042 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751583AbbETCp1 (ORCPT ); Tue, 19 May 2015 22:45:27 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.13,462,1427785200"; d="scan'208";a="495823954" From: Liang Li To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: gleb@kernel.or, pbonzini@redhat.com, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, yang.z.zhang@intel.com, Liang Li Subject: [PATCH] kvm/fpu: Enable eager restore kvm FPU for MPX Date: Wed, 20 May 2015 22:35:39 +0800 Message-Id: <1432132539-6194-1-git-send-email-liang.z.li@intel.com> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1446 Lines: 46 The MPX feature requires eager KVM FPU restore support. We have verified that MPX cannot work correctly with the current lazy KVM FPU restore mechanism. Eager KVM FPU restore should be enabled if the MPX feature is exposed to VM. Signed-off-by: Liang Li --- arch/x86/kvm/vmx.c | 2 ++ arch/x86/kvm/x86.c | 3 ++- 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index f7b6168..e2cccbe 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -8445,6 +8445,8 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id) goto free_vmcs; } + if (vmx_mpx_supported()) + vmx_fpu_activate(&vmx->vcpu); return &vmx->vcpu; free_vmcs: diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 5f38188..5993f5f 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -7060,7 +7060,8 @@ void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) fpu_save_init(&vcpu->arch.guest_fpu); __kernel_fpu_end(); ++vcpu->stat.fpu_reload; - kvm_make_request(KVM_REQ_DEACTIVATE_FPU, vcpu); + if (!kvm_x86_ops->mpx_supported()) + kvm_make_request(KVM_REQ_DEACTIVATE_FPU, vcpu); trace_kvm_fpu(0); } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/