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KVM: x86/mmu: replace root_level with cpu_role.base.level

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Remove another duplicate field of struct kvm_mmu.  This time it's
the root level for page table walking; the separate field is
always initialized as cpu_role.base.level, so its users can look
up the CPU mode directly instead.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2022-02-10 07:42:22 -05:00
parent a972e29c1d
commit 4d25502aa1
3 changed files with 9 additions and 14 deletions
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1
arch/x86/include/asm/kvm_host.h
View file

@ -438,7 +438,6 @@ struct kvm_mmu {
struct kvm_mmu_root_info root;
union kvm_cpu_role cpu_role;
union kvm_mmu_page_role root_role;
u8 root_level;
bool direct_map;
/*

18
arch/x86/kvm/mmu/mmu.c
View file

@ -2132,7 +2132,7 @@ static void shadow_walk_init_using_root(struct kvm_shadow_walk_iterator *iterato
iterator->level = vcpu->arch.mmu->root_role.level;
if (iterator->level >= PT64_ROOT_4LEVEL &&
vcpu->arch.mmu->root_level < PT64_ROOT_4LEVEL &&
vcpu->arch.mmu->cpu_role.base.level < PT64_ROOT_4LEVEL &&
!vcpu->arch.mmu->direct_map)
iterator->level = PT32E_ROOT_LEVEL;
@ -3491,7 +3491,7 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
* On SVM, reading PDPTRs might access guest memory, which might fault
* and thus might sleep. Grab the PDPTRs before acquiring mmu_lock.
*/
if (mmu->root_level == PT32E_ROOT_LEVEL) {
if (mmu->cpu_role.base.level == PT32E_ROOT_LEVEL) {
for (i = 0; i < 4; ++i) {
pdptrs[i] = mmu->get_pdptr(vcpu, i);
if (!(pdptrs[i] & PT_PRESENT_MASK))
@ -3515,7 +3515,7 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
* Do we shadow a long mode page table? If so we need to
* write-protect the guests page table root.
*/
if (mmu->root_level >= PT64_ROOT_4LEVEL) {
if (mmu->cpu_role.base.level >= PT64_ROOT_4LEVEL) {
root = mmu_alloc_root(vcpu, root_gfn, 0,
mmu->root_role.level, false);
mmu->root.hpa = root;
@ -3554,7 +3554,7 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
for (i = 0; i < 4; ++i) {
WARN_ON_ONCE(IS_VALID_PAE_ROOT(mmu->pae_root[i]));
if (mmu->root_level == PT32E_ROOT_LEVEL) {
if (mmu->cpu_role.base.level == PT32E_ROOT_LEVEL) {
if (!(pdptrs[i] & PT_PRESENT_MASK)) {
mmu->pae_root[i] = INVALID_PAE_ROOT;
continue;
@ -3596,7 +3596,7 @@ static int mmu_alloc_special_roots(struct kvm_vcpu *vcpu)
* equivalent level in the guest's NPT to shadow. Allocate the tables
* 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 ||
if (mmu->direct_map || mmu->cpu_role.base.level >= PT64_ROOT_4LEVEL ||
mmu->root_role.level < PT64_ROOT_4LEVEL)
return 0;
@ -3701,7 +3701,7 @@ void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu)
vcpu_clear_mmio_info(vcpu, MMIO_GVA_ANY);
if (vcpu->arch.mmu->root_level >= PT64_ROOT_4LEVEL) {
if (vcpu->arch.mmu->cpu_role.base.level >= PT64_ROOT_4LEVEL) {
hpa_t root = vcpu->arch.mmu->root.hpa;
sp = to_shadow_page(root);
@ -4417,7 +4417,7 @@ static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu,
{
__reset_rsvds_bits_mask(&context->guest_rsvd_check,
vcpu->arch.reserved_gpa_bits,
context->root_level, is_efer_nx(context),
context->cpu_role.base.level, is_efer_nx(context),
guest_can_use_gbpages(vcpu),
is_cr4_pse(context),
guest_cpuid_is_amd_or_hygon(vcpu));
@ -4826,7 +4826,6 @@ 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 = cpu_role.base.level;
if (!is_cr0_pg(context))
context->gva_to_gpa = nonpaging_gva_to_gpa;
@ -4856,7 +4855,6 @@ static void shadow_mmu_init_context(struct kvm_vcpu *vcpu, struct kvm_mmu *conte
paging64_init_context(context);
else
paging32_init_context(context);
context->root_level = cpu_role.base.level;
reset_guest_paging_metadata(vcpu, context);
reset_shadow_zero_bits_mask(vcpu, context);
@ -4954,7 +4952,6 @@ void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly,
context->gva_to_gpa = ept_gva_to_gpa;
context->sync_page = ept_sync_page;
context->invlpg = ept_invlpg;
context->root_level = level;
context->direct_map = false;
update_permission_bitmask(context, true);
context->pkru_mask = 0;
@ -4990,7 +4987,6 @@ static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu,
g_context->get_guest_pgd = get_cr3;
g_context->get_pdptr = kvm_pdptr_read;
g_context->inject_page_fault = kvm_inject_page_fault;
g_context->root_level = new_mode.base.level;
/*
* L2 page tables are never shadowed, so there is no need to sync

4
arch/x86/kvm/mmu/paging_tmpl.h
View file

@ -319,7 +319,7 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker,
trace_kvm_mmu_pagetable_walk(addr, access);
retry_walk:
walker->level = mmu->root_level;
walker->level = mmu->cpu_role.base.level;
pte = mmu->get_guest_pgd(vcpu);
have_ad = PT_HAVE_ACCESSED_DIRTY(mmu);
@ -621,7 +621,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault,
WARN_ON_ONCE(gw->gfn != base_gfn);
direct_access = gw->pte_access;
top_level = vcpu->arch.mmu->root_level;
top_level = vcpu->arch.mmu->cpu_role.base.level;
if (top_level == PT32E_ROOT_LEVEL)
top_level = PT32_ROOT_LEVEL;
/*