[RFC PATCH 25/37] KVM: x86/mmu: Pass root role to kvm_tdp_mmu_get_vcpu_root_hpa()

David Matlack
2022-12-08T19:46:04Z

Pass the root role from the caller rather than grabbing it from
vcpu->arch.mmu. This will enable the TDP MMU to be moved to common code
in a future commit by removing a dependency on vcpu->arch.

No functional change intended.

Signed-off-by: David Matlack <dmatlack@google.com>
---
arch/x86/kvm/mmu/mmu.c | 2 +-
arch/x86/kvm/mmu/tdp_mmu.c | 4 ++--
arch/x86/kvm/mmu/tdp_mmu.h | 3 ++-
3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 9307608ae975..aea7df3c2dcb 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -3612,7 +3612,7 @@ static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu)
goto out_unlock;

if (tdp_mmu_enabled) {
- root = kvm_tdp_mmu_get_vcpu_root_hpa(vcpu);
+ root = kvm_tdp_mmu_get_vcpu_root_hpa(vcpu, mmu->root_role);
mmu->root.hpa = root;
} else if (shadow_root_level >= PT64_ROOT_4LEVEL) {
root = mmu_alloc_root(vcpu, 0, 0, shadow_root_level);
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index e6708829714c..c5d1c9010d21 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -301,9 +301,9 @@ static void tdp_mmu_init_child_sp(struct kvm_mmu_page *child_sp,
tdp_mmu_init_sp(child_sp, iter->sptep, iter->gfn, role);
}

-hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu)
+hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu,
+ union kvm_mmu_page_role role)
{
- union kvm_mmu_page_role role = vcpu->arch.mmu->root_role;
struct kvm *kvm = vcpu->kvm;
struct kvm_mmu_page *root;

diff --git a/arch/x86/kvm/mmu/tdp_mmu.h b/arch/x86/kvm/mmu/tdp_mmu.h
index e6a929089715..897608be7f75 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.h
+++ b/arch/x86/kvm/mmu/tdp_mmu.h
@@ -10,7 +10,8 @@
int kvm_mmu_init_tdp_mmu(struct kvm *kvm);
void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm);

-hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu);
+hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu,
+ union kvm_mmu_page_role role);

__must_check static inline bool kvm_tdp_mmu_get_root(struct kvm_mmu_page *root)
{
--
2.39.0.rc1.256.g54fd8350bd-goog