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From 99e4847c8110fd6e3f654cf07ea0e71964760bed Mon Sep 17 00:00:00 2001
From: Tom Lendacky <thomas.lendacky@amd.com>
Date: Mon, 4 Dec 2017 10:57:24 -0600
Subject: [PATCH 60/95] kvm: svm: prepare for new bit definition in nested_ctl
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Currently the nested_ctl variable in the vmcb_control_area structure is
used to indicate nested paging support. The nested paging support field
is actually defined as bit 0 of the field. In order to support a new
feature flag the usage of the nested_ctl and nested paging support must
be converted to operate on a single bit.
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: x86@kernel.org
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Sudheesh Mavila <sudheesh.mavila@amd.com>
---
arch/x86/include/asm/svm.h | 2 ++
arch/x86/kvm/svm.c | 7 ++++---
2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
index 78dd9df..c936c98 100644
--- a/arch/x86/include/asm/svm.h
+++ b/arch/x86/include/asm/svm.h
@@ -146,6 +146,8 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
#define SVM_VM_CR_SVM_LOCK_MASK 0x0008ULL
#define SVM_VM_CR_SVM_DIS_MASK 0x0010ULL
+#define SVM_NESTED_CTL_NP_ENABLE BIT(0)
+
struct __attribute__ ((__packed__)) vmcb_seg {
u16 selector;
u16 attrib;
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index f6bebce..3c637b97 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1330,7 +1330,7 @@ static void init_vmcb(struct vcpu_svm *svm)
if (npt_enabled) {
/* Setup VMCB for Nested Paging */
- control->nested_ctl = 1;
+ control->nested_ctl |= SVM_NESTED_CTL_NP_ENABLE;
clr_intercept(svm, INTERCEPT_INVLPG);
clr_exception_intercept(svm, PF_VECTOR);
clr_cr_intercept(svm, INTERCEPT_CR3_READ);
@@ -2960,7 +2960,8 @@ static bool nested_vmcb_checks(struct vmcb *vmcb)
if (vmcb->control.asid == 0)
return false;
- if (vmcb->control.nested_ctl && !npt_enabled)
+ if ((vmcb->control.nested_ctl & SVM_NESTED_CTL_NP_ENABLE) &&
+ !npt_enabled)
return false;
return true;
@@ -3035,7 +3036,7 @@ static bool nested_svm_vmrun(struct vcpu_svm *svm)
else
svm->vcpu.arch.hflags &= ~HF_HIF_MASK;
- if (nested_vmcb->control.nested_ctl) {
+ if (nested_vmcb->control.nested_ctl & SVM_NESTED_CTL_NP_ENABLE) {
kvm_mmu_unload(&svm->vcpu);
svm->nested.nested_cr3 = nested_vmcb->control.nested_cr3;
nested_svm_init_mmu_context(&svm->vcpu);
--
2.7.4
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