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kvm: svm: prepare for new bit definition in nested_ctl

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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>
This commit is contained in:
Tom Lendacky 2017-12-04 10:57:24 -06:00 committed by Brijesh Singh
parent 18c71ce9c8
commit cea3a19b00
2 changed files with 6 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/x86/include/asm/svm.h
View file

@ -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;

7
arch/x86/kvm/svm.c
View file

@ -1293,7 +1293,7 @@ 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);
@ -2918,7 +2918,8 @@ 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;
@ -2932,7 +2933,7 @@ static void enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
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);