From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joel Schopp Subject: [PATCH v2] x86: svm: use cr_interception for SVM_EXIT_CR0_SEL_WRITE Date: Fri, 6 Mar 2015 14:44:35 -0600 Message-ID: <20150306204435.18348.72139.stgit@joelvmguard2.amd.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: Joerg Roedel , Borislav Petkov , , David Kaplan , To: Gleb Natapov , Paolo Bonzini , Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org From: David Kaplan Another patch in my war on emulate_on_interception() use as a svm exit handler. These were pulled out of a larger patch at the suggestion of Radim Krcmar, see https://lkml.org/lkml/2015/2/25/559 Changes since v1: * fixed typo introduced after test, retested Signed-off-by: David Kaplan [separated out just cr_interception part from larger removal of INTERCEPT_CR0_WRITE, forward ported, tested] Signed-off-by: Joel Schopp --- arch/x86/kvm/svm.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index d319e0c..16ad05b 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -2940,7 +2940,10 @@ static int cr_interception(struct vcpu_svm *svm) return emulate_on_interception(svm); reg = svm->vmcb->control.exit_info_1 & SVM_EXITINFO_REG_MASK; - cr = svm->vmcb->control.exit_code - SVM_EXIT_READ_CR0; + if (svm->vmcb->control.exit_code == SVM_EXIT_CR0_SEL_WRITE) + cr = SVM_EXIT_WRITE_CR0 - SVM_EXIT_READ_CR0; + else + cr = svm->vmcb->control.exit_code - SVM_EXIT_READ_CR0; err = 0; if (cr >= 16) { /* mov to cr */ @@ -3325,7 +3328,7 @@ static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = { [SVM_EXIT_READ_CR3] = cr_interception, [SVM_EXIT_READ_CR4] = cr_interception, [SVM_EXIT_READ_CR8] = cr_interception, - [SVM_EXIT_CR0_SEL_WRITE] = emulate_on_interception, + [SVM_EXIT_CR0_SEL_WRITE] = cr_interception, [SVM_EXIT_WRITE_CR0] = cr_interception, [SVM_EXIT_WRITE_CR3] = cr_interception, [SVM_EXIT_WRITE_CR4] = cr_interception,