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Subject[RFC Part2 PATCH v3 06/26] KVM: SVM: Prepare for new bit definition in nested_ctl
Date
From: Tom Lendacky <thomas.lendacky@amd.com>

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.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@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 58fffe7..a3d9e0b 100644
--- a/arch/x86/include/asm/svm.h
+++ b/arch/x86/include/asm/svm.h
@@ -139,6 +139,8 @@ 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 06bd902..1cd7c78 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1296,7 +1296,7 @@ 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);
@@ -2904,7 +2904,8 @@ 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;
@@ -2979,7 +2980,7 @@ 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);
--
2.9.4
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