From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934955AbeBURrn (ORCPT ); Wed, 21 Feb 2018 12:47:43 -0500 Received: from smtp-fw-33001.amazon.com ([207.171.190.10]:46048 "EHLO smtp-fw-33001.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932422AbeBURrj (ORCPT ); Wed, 21 Feb 2018 12:47:39 -0500 X-IronPort-AV: E=Sophos;i="5.47,375,1515456000"; d="scan'208";a="720905219" From: KarimAllah Ahmed To: x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: hpa@zytor.com, jmattson@google.com, mingo@redhat.com, pbonzini@redhat.com, rkrcmar@redhat.com, tglx@linutronix.de, KarimAllah Ahmed Subject: [PATCH 01/10] X86/nVMX: handle_vmon: Read 4 bytes from guest memory instead of map->read->unmap sequence Date: Wed, 21 Feb 2018 18:47:12 +0100 Message-Id: <1519235241-6500-2-git-send-email-karahmed@amazon.de> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1519235241-6500-1-git-send-email-karahmed@amazon.de> References: <1519235241-6500-1-git-send-email-karahmed@amazon.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ... which also avoids using kvm_vcpu_gpa_to_page() and kmap() which assumes that there is a "struct page" for guest memory. Suggested-by: Jim Mattson Signed-off-by: KarimAllah Ahmed --- arch/x86/kvm/vmx.c | 14 +++----------- 1 file changed, 3 insertions(+), 11 deletions(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 19a150b..cf696e2 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -7562,7 +7562,7 @@ static int handle_vmon(struct kvm_vcpu *vcpu) { int ret; gpa_t vmptr; - struct page *page; + uint32_t revision; struct vcpu_vmx *vmx = to_vmx(vcpu); const u64 VMXON_NEEDED_FEATURES = FEATURE_CONTROL_LOCKED | FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX; @@ -7608,19 +7608,11 @@ static int handle_vmon(struct kvm_vcpu *vcpu) return kvm_skip_emulated_instruction(vcpu); } - page = kvm_vcpu_gpa_to_page(vcpu, vmptr); - if (is_error_page(page)) { + if (kvm_read_guest(vcpu->kvm, vmptr, &revision, sizeof(revision)) || + revision != VMCS12_REVISION) { nested_vmx_failInvalid(vcpu); return kvm_skip_emulated_instruction(vcpu); } - if (*(u32 *)kmap(page) != VMCS12_REVISION) { - kunmap(page); - kvm_release_page_clean(page); - nested_vmx_failInvalid(vcpu); - return kvm_skip_emulated_instruction(vcpu); - } - kunmap(page); - kvm_release_page_clean(page); vmx->nested.vmxon_ptr = vmptr; ret = enter_vmx_operation(vcpu); -- 2.7.4