[PATCH v2 21/25] KVM: x86/mmu: replace shadow_root_level with root_role.level

From: Paolo Bonzini
Date: Mon Feb 21 2022 - 11:25:00 EST

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root_role.level is always the same value as shadow_level:

- it's kvm_mmu_get_tdp_level(vcpu) when going through init_kvm_tdp_mmu

- it's the level argument when going through kvm_init_shadow_ept_mmu

- it's assigned directly from new_role.base.level when going
through shadow_mmu_init_context

Remove the duplication and get the level directly from the role.

Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 1 -
arch/x86/kvm/mmu.h | 2 +-
arch/x86/kvm/mmu/mmu.c | 33 ++++++++++++++-------------------
arch/x86/kvm/mmu/tdp_mmu.c | 2 +-
arch/x86/kvm/svm/svm.c | 2 +-
arch/x86/kvm/vmx/vmx.c | 2 +-
6 files changed, 18 insertions(+), 24 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index b8b115b2038f..81897aa4e669 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -432,7 +432,6 @@ struct kvm_mmu {
union kvm_mmu_paging_mode cpu_mode;
union kvm_mmu_page_role root_role;
u8 root_level;
- u8 shadow_root_level;
bool direct_map;
struct kvm_mmu_root_info prev_roots[KVM_MMU_NUM_PREV_ROOTS];

diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index 6ee4436e46f1..596ac2d424fc 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -113,7 +113,7 @@ static inline void kvm_mmu_load_pgd(struct kvm_vcpu *vcpu)
return;

static_call(kvm_x86_load_mmu_pgd)(vcpu, root_hpa,
- vcpu->arch.mmu->shadow_root_level);
+ vcpu->arch.mmu->root_role.level);
}

extern unsigned long kvm_get_guest_cr3(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index a7028c2ae5c7..c33879f23e94 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2127,7 +2127,7 @@ static void shadow_walk_init_using_root(struct kvm_shadow_walk_iterator *iterato
{
iterator->addr = addr;
iterator->shadow_addr = root;
- iterator->level = vcpu->arch.mmu->shadow_root_level;
+ iterator->level = vcpu->arch.mmu->root_role.level;

if (iterator->level >= PT64_ROOT_4LEVEL &&
vcpu->arch.mmu->root_level < PT64_ROOT_4LEVEL &&
@@ -3316,7 +3316,7 @@ static hpa_t mmu_alloc_root(struct kvm_vcpu *vcpu, gfn_t gfn, gva_t gva,
static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu)
{
struct kvm_mmu *mmu = vcpu->arch.mmu;
- u8 shadow_root_level = mmu->shadow_root_level;
+ u8 shadow_root_level = mmu->root_role.level;
hpa_t root;
unsigned i;
int r;
@@ -3466,7 +3466,7 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
*/
if (mmu->root_level >= PT64_ROOT_4LEVEL) {
root = mmu_alloc_root(vcpu, root_gfn, 0,
- mmu->shadow_root_level, false);
+ mmu->root_role.level, false);
mmu->root.hpa = root;
goto set_root_pgd;
}
@@ -3482,7 +3482,7 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
* the shadow page table may be a PAE or a long mode page table.
*/
pm_mask = PT_PRESENT_MASK | shadow_me_mask;
- if (mmu->shadow_root_level >= PT64_ROOT_4LEVEL) {
+ if (mmu->root_role.level >= PT64_ROOT_4LEVEL) {
pm_mask |= PT_ACCESSED_MASK | PT_WRITABLE_MASK | PT_USER_MASK;

if (WARN_ON_ONCE(!mmu->pml4_root)) {
@@ -3491,7 +3491,7 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
}
mmu->pml4_root[0] = __pa(mmu->pae_root) | pm_mask;

- if (mmu->shadow_root_level == PT64_ROOT_5LEVEL) {
+ if (mmu->root_role.level == PT64_ROOT_5LEVEL) {
if (WARN_ON_ONCE(!mmu->pml5_root)) {
r = -EIO;
goto out_unlock;
@@ -3516,9 +3516,9 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
mmu->pae_root[i] = root | pm_mask;
}

- if (mmu->shadow_root_level == PT64_ROOT_5LEVEL)
+ if (mmu->root_role.level == PT64_ROOT_5LEVEL)
mmu->root.hpa = __pa(mmu->pml5_root);
- else if (mmu->shadow_root_level == PT64_ROOT_4LEVEL)
+ else if (mmu->root_role.level == PT64_ROOT_4LEVEL)
mmu->root.hpa = __pa(mmu->pml4_root);
else
mmu->root.hpa = __pa(mmu->pae_root);
@@ -3534,7 +3534,7 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
static int mmu_alloc_special_roots(struct kvm_vcpu *vcpu)
{
struct kvm_mmu *mmu = vcpu->arch.mmu;
- bool need_pml5 = mmu->shadow_root_level > PT64_ROOT_4LEVEL;
+ bool need_pml5 = mmu->root_role.level > PT64_ROOT_4LEVEL;
u64 *pml5_root = NULL;
u64 *pml4_root = NULL;
u64 *pae_root;
@@ -3546,7 +3546,7 @@ static int mmu_alloc_special_roots(struct kvm_vcpu *vcpu)
* on demand, as running a 32-bit L1 VMM on 64-bit KVM is very rare.
*/
if (mmu->direct_map || mmu->root_level >= PT64_ROOT_4LEVEL ||
- mmu->shadow_root_level < PT64_ROOT_4LEVEL)
+ mmu->root_role.level < PT64_ROOT_4LEVEL)
return 0;

/*
@@ -4420,18 +4420,18 @@ static void reset_shadow_zero_bits_mask(struct kvm_vcpu *vcpu,
struct rsvd_bits_validate *shadow_zero_check;
int i;

- WARN_ON_ONCE(context->shadow_root_level < PT32E_ROOT_LEVEL);
+ WARN_ON_ONCE(context->root_role.level < PT32E_ROOT_LEVEL);

shadow_zero_check = &context->shadow_zero_check;
__reset_rsvds_bits_mask(shadow_zero_check, reserved_hpa_bits(),
- context->shadow_root_level,
+ context->root_role.level,
context->root_role.efer_nx,
guest_can_use_gbpages(vcpu), is_pse, is_amd);

if (!shadow_me_mask)
return;

- for (i = context->shadow_root_level; --i >= 0;) {
+ for (i = context->root_role.level; --i >= 0;) {
shadow_zero_check->rsvd_bits_mask[0][i] &= ~shadow_me_mask;
shadow_zero_check->rsvd_bits_mask[1][i] &= ~shadow_me_mask;
}
@@ -4458,7 +4458,7 @@ reset_tdp_shadow_zero_bits_mask(struct kvm_mmu *context)

if (boot_cpu_is_amd())
__reset_rsvds_bits_mask(shadow_zero_check, reserved_hpa_bits(),
- context->shadow_root_level, false,
+ context->root_role.level, false,
boot_cpu_has(X86_FEATURE_GBPAGES),
false, true);
else
@@ -4469,7 +4469,7 @@ reset_tdp_shadow_zero_bits_mask(struct kvm_mmu *context)
if (!shadow_me_mask)
return;

- for (i = context->shadow_root_level; --i >= 0;) {
+ for (i = context->root_role.level; --i >= 0;) {
shadow_zero_check->rsvd_bits_mask[0][i] &= ~shadow_me_mask;
shadow_zero_check->rsvd_bits_mask[1][i] &= ~shadow_me_mask;
}
@@ -4748,7 +4748,6 @@ static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu, union kvm_mmu_paging_mode cp
context->page_fault = kvm_tdp_page_fault;
context->sync_page = nonpaging_sync_page;
context->invlpg = NULL;
- context->shadow_root_level = kvm_mmu_get_tdp_level(vcpu);
context->direct_map = true;
context->get_guest_pgd = kvm_get_guest_cr3;
context->get_pdptr = kvm_pdptr_read;
@@ -4786,8 +4785,6 @@ static void shadow_mmu_init_context(struct kvm_vcpu *vcpu, struct kvm_mmu *conte
context->root_level = cpu_mode.base.level;

reset_guest_paging_metadata(vcpu, context);
- context->shadow_root_level = root_role.level;
-
reset_shadow_zero_bits_mask(vcpu, context);
}

@@ -4873,8 +4870,6 @@ void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly,
context->cpu_mode.as_u64 = new_mode.as_u64;
context->root_role.word = new_mode.base.word;

- context->shadow_root_level = level;
-
context->page_fault = ept_page_fault;
context->gva_to_gpa = ept_gva_to_gpa;
context->sync_page = ept_sync_page;
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index c18ad86c9a82..ab8c09db4c19 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -1697,7 +1697,7 @@ int kvm_tdp_mmu_get_walk(struct kvm_vcpu *vcpu, u64 addr, u64 *sptes,
gfn_t gfn = addr >> PAGE_SHIFT;
int leaf = -1;

- *root_level = vcpu->arch.mmu->shadow_root_level;
+ *root_level = vcpu->arch.mmu->root_role.level;

tdp_mmu_for_each_pte(iter, mmu, gfn, gfn + 1) {
leaf = iter.level;
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 7038c76fa841..d169221d9305 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3863,7 +3863,7 @@ static void svm_load_mmu_pgd(struct kvm_vcpu *vcpu, hpa_t root_hpa,
hv_track_root_tdp(vcpu, root_hpa);

cr3 = vcpu->arch.cr3;
- } else if (vcpu->arch.mmu->shadow_root_level >= PT64_ROOT_4LEVEL) {
+ } else if (vcpu->arch.mmu->root_role.level >= PT64_ROOT_4LEVEL) {
cr3 = __sme_set(root_hpa) | kvm_get_active_pcid(vcpu);
} else {
/* PCID in the guest should be impossible with a 32-bit MMU. */
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index b183dfc41d74..00a79b82fa46 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -2960,7 +2960,7 @@ static void vmx_flush_tlb_current(struct kvm_vcpu *vcpu)

if (enable_ept)
ept_sync_context(construct_eptp(vcpu, root_hpa,
- mmu->shadow_root_level));
+ mmu->root_role.level));
else
vpid_sync_context(vmx_get_current_vpid(vcpu));
}
--
2.31.1

Next message: Paolo Bonzini: "[PATCH v2 17/25] KVM: x86/mmu: remove redundant bits from extended role"
Previous message: Paolo Bonzini: "[PATCH v2 23/25] KVM: x86/mmu: replace direct_map with root_role.direct"
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