KVM: x86/mmu: Add a helper to calculate root from role_regs

Add a helper to calculate the level for non-EPT page tables from the
MMU's role_regs.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210622175739.3610207-45-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-06-22 10:57:29 -07:00 коммит произвёл Paolo Bonzini
Родитель 533f9a4b38
Коммит f4bd6f7376
1 изменённых файлов: 25 добавлений и 35 удалений

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@ -238,6 +238,19 @@ static struct kvm_mmu_role_regs vcpu_to_role_regs(struct kvm_vcpu *vcpu)
return regs;
}
static int role_regs_to_root_level(struct kvm_mmu_role_regs *regs)
{
if (!____is_cr0_pg(regs))
return 0;
else if (____is_efer_lma(regs))
return ____is_cr4_la57(regs) ? PT64_ROOT_5LEVEL :
PT64_ROOT_4LEVEL;
else if (____is_cr4_pae(regs))
return PT32E_ROOT_LEVEL;
else
return PT32_ROOT_LEVEL;
}
static inline bool kvm_available_flush_tlb_with_range(void)
{
return kvm_x86_ops.tlb_remote_flush_with_range;
@ -3949,7 +3962,6 @@ static void nonpaging_init_context(struct kvm_mmu *context)
context->gva_to_gpa = nonpaging_gva_to_gpa;
context->sync_page = nonpaging_sync_page;
context->invlpg = NULL;
context->root_level = 0;
context->direct_map = true;
}
@ -4519,11 +4531,8 @@ static void reset_guest_paging_metadata(struct kvm_vcpu *vcpu,
update_last_nonleaf_level(mmu);
}
static void paging64_init_context_common(struct kvm_mmu *context,
int root_level)
static void paging64_init_context_common(struct kvm_mmu *context)
{
context->root_level = root_level;
WARN_ON_ONCE(!is_cr4_pae(context));
context->page_fault = paging64_page_fault;
context->gva_to_gpa = paging64_gva_to_gpa;
@ -4532,18 +4541,13 @@ static void paging64_init_context_common(struct kvm_mmu *context,
context->direct_map = false;
}
static void paging64_init_context(struct kvm_mmu *context,
struct kvm_mmu_role_regs *regs)
static void paging64_init_context(struct kvm_mmu *context)
{
int root_level = ____is_cr4_la57(regs) ? PT64_ROOT_5LEVEL :
PT64_ROOT_4LEVEL;
paging64_init_context_common(context, root_level);
paging64_init_context_common(context);
}
static void paging32_init_context(struct kvm_mmu *context)
{
context->root_level = PT32_ROOT_LEVEL;
context->page_fault = paging32_page_fault;
context->gva_to_gpa = paging32_gva_to_gpa;
context->sync_page = paging32_sync_page;
@ -4553,7 +4557,7 @@ static void paging32_init_context(struct kvm_mmu *context)
static void paging32E_init_context(struct kvm_mmu *context)
{
paging64_init_context_common(context, PT32E_ROOT_LEVEL);
paging64_init_context_common(context);
}
static union kvm_mmu_extended_role kvm_calc_mmu_role_ext(struct kvm_vcpu *vcpu,
@ -4642,21 +4646,16 @@ static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
context->get_guest_pgd = get_cr3;
context->get_pdptr = kvm_pdptr_read;
context->inject_page_fault = kvm_inject_page_fault;
context->root_level = role_regs_to_root_level(&regs);
if (!is_paging(vcpu)) {
if (!is_paging(vcpu))
context->gva_to_gpa = nonpaging_gva_to_gpa;
context->root_level = 0;
} else if (is_long_mode(vcpu)) {
context->root_level = ____is_cr4_la57(&regs) ?
PT64_ROOT_5LEVEL : PT64_ROOT_4LEVEL;
else if (is_long_mode(vcpu))
context->gva_to_gpa = paging64_gva_to_gpa;
} else if (is_pae(vcpu)) {
context->root_level = PT32E_ROOT_LEVEL;
else if (is_pae(vcpu))
context->gva_to_gpa = paging64_gva_to_gpa;
} else {
context->root_level = PT32_ROOT_LEVEL;
else
context->gva_to_gpa = paging32_gva_to_gpa;
}
reset_guest_paging_metadata(vcpu, context);
reset_tdp_shadow_zero_bits_mask(vcpu, context);
@ -4706,11 +4705,12 @@ static void shadow_mmu_init_context(struct kvm_vcpu *vcpu, struct kvm_mmu *conte
if (!____is_cr0_pg(regs))
nonpaging_init_context(context);
else if (____is_efer_lma(regs))
paging64_init_context(context, regs);
paging64_init_context(context);
else if (____is_cr4_pae(regs))
paging32E_init_context(context);
else
paging32_init_context(context);
context->root_level = role_regs_to_root_level(regs);
reset_guest_paging_metadata(vcpu, context);
context->shadow_root_level = new_role.base.level;
@ -4849,17 +4849,7 @@ kvm_calc_nested_mmu_role(struct kvm_vcpu *vcpu, struct kvm_mmu_role_regs *regs)
* to "true" to try to detect bogus usage of the nested MMU.
*/
role.base.direct = true;
if (!____is_cr0_pg(regs))
role.base.level = 0;
else if (____is_efer_lma(regs))
role.base.level = ____is_cr4_la57(regs) ? PT64_ROOT_5LEVEL :
PT64_ROOT_4LEVEL;
else if (____is_cr4_pae(regs))
role.base.level = PT32E_ROOT_LEVEL;
else
role.base.level = PT32_ROOT_LEVEL;
role.base.level = role_regs_to_root_level(regs);
return role;
}