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KVM: x86: use struct kvm_mmu_root_info for mmu->root

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The root_hpa and root_pgd fields form essentially a struct kvm_mmu_root_info.
Use the struct to have more consistency between mmu->root and
mmu->prev_roots.

The patch is entirely search and replace except for cached_root_available,
which does not need a temporary struct kvm_mmu_root_info anymore.

Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2022-02-21 09:28:33 -05:00
parent 9191b8f074
commit b9e5603c2a
9 changed files with 41 additions and 49 deletions
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3
arch/x86/include/asm/kvm_host.h
View File

@ -432,8 +432,7 @@ struct kvm_mmu {
int (*sync_page)(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *sp);
void (*invlpg)(struct kvm_vcpu *vcpu, gva_t gva, hpa_t root_hpa);
hpa_t root_hpa;
gpa_t root_pgd;
struct kvm_mmu_root_info root;
union kvm_mmu_role mmu_role;
u8 root_level;
u8 shadow_root_level;

4
arch/x86/kvm/mmu.h
View File

@ -85,7 +85,7 @@ void kvm_mmu_sync_prev_roots(struct kvm_vcpu *vcpu);
static inline int kvm_mmu_reload(struct kvm_vcpu *vcpu)
{
if (likely(vcpu->arch.mmu->root_hpa != INVALID_PAGE))
if (likely(vcpu->arch.mmu->root.hpa != INVALID_PAGE))
return 0;
return kvm_mmu_load(vcpu);
@ -107,7 +107,7 @@ static inline unsigned long kvm_get_active_pcid(struct kvm_vcpu *vcpu)
static inline void kvm_mmu_load_pgd(struct kvm_vcpu *vcpu)
{
u64 root_hpa = vcpu->arch.mmu->root_hpa;
u64 root_hpa = vcpu->arch.mmu->root.hpa;
if (!VALID_PAGE(root_hpa))
return;

71
arch/x86/kvm/mmu/mmu.c
View File

@ -2146,7 +2146,7 @@ static void shadow_walk_init_using_root(struct kvm_shadow_walk_iterator *iterato
* prev_root is currently only used for 64-bit hosts. So only
* the active root_hpa is valid here.
*/
BUG_ON(root != vcpu->arch.mmu->root_hpa);
BUG_ON(root != vcpu->arch.mmu->root.hpa);
iterator->shadow_addr
= vcpu->arch.mmu->pae_root[(addr >> 30) & 3];
@ -2160,7 +2160,7 @@ static void shadow_walk_init_using_root(struct kvm_shadow_walk_iterator *iterato
static void shadow_walk_init(struct kvm_shadow_walk_iterator *iterator,
struct kvm_vcpu *vcpu, u64 addr)
{
shadow_walk_init_using_root(iterator, vcpu, vcpu->arch.mmu->root_hpa,
shadow_walk_init_using_root(iterator, vcpu, vcpu->arch.mmu->root.hpa,
addr);
}
@ -3229,7 +3229,7 @@ void kvm_mmu_free_roots(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
BUILD_BUG_ON(KVM_MMU_NUM_PREV_ROOTS >= BITS_PER_LONG);
/* Before acquiring the MMU lock, see if we need to do any real work. */
if (!(free_active_root && VALID_PAGE(mmu->root_hpa))) {
if (!(free_active_root && VALID_PAGE(mmu->root.hpa))) {
for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++)
if ((roots_to_free & KVM_MMU_ROOT_PREVIOUS(i)) &&
VALID_PAGE(mmu->prev_roots[i].hpa))
@ -3249,7 +3249,7 @@ void kvm_mmu_free_roots(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
if (free_active_root) {
if (mmu->shadow_root_level >= PT64_ROOT_4LEVEL &&
(mmu->root_level >= PT64_ROOT_4LEVEL || mmu->direct_map)) {
mmu_free_root_page(kvm, &mmu->root_hpa, &invalid_list);
mmu_free_root_page(kvm, &mmu->root.hpa, &invalid_list);
} else if (mmu->pae_root) {
for (i = 0; i < 4; ++i) {
if (!IS_VALID_PAE_ROOT(mmu->pae_root[i]))
@ -3260,8 +3260,8 @@ void kvm_mmu_free_roots(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
mmu->pae_root[i] = INVALID_PAE_ROOT;
}
}
mmu->root_hpa = INVALID_PAGE;
mmu->root_pgd = 0;
mmu->root.hpa = INVALID_PAGE;
mmu->root.pgd = 0;
}
kvm_mmu_commit_zap_page(kvm, &invalid_list);
@ -3334,10 +3334,10 @@ static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu)
if (is_tdp_mmu_enabled(vcpu->kvm)) {
root = kvm_tdp_mmu_get_vcpu_root_hpa(vcpu);
mmu->root_hpa = root;
mmu->root.hpa = root;
} else if (shadow_root_level >= PT64_ROOT_4LEVEL) {
root = mmu_alloc_root(vcpu, 0, 0, shadow_root_level, true);
mmu->root_hpa = root;
mmu->root.hpa = root;
} else if (shadow_root_level == PT32E_ROOT_LEVEL) {
if (WARN_ON_ONCE(!mmu->pae_root)) {
r = -EIO;
@ -3352,15 +3352,15 @@ static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu)
mmu->pae_root[i] = root | PT_PRESENT_MASK |
shadow_me_mask;
}
mmu->root_hpa = __pa(mmu->pae_root);
mmu->root.hpa = __pa(mmu->pae_root);
} else {
WARN_ONCE(1, "Bad TDP root level = %d\n", shadow_root_level);
r = -EIO;
goto out_unlock;
}
/* root_pgd is ignored for direct MMUs. */
mmu->root_pgd = 0;
/* root.pgd is ignored for direct MMUs. */
mmu->root.pgd = 0;
out_unlock:
write_unlock(&vcpu->kvm->mmu_lock);
return r;
@ -3473,7 +3473,7 @@ 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_hpa = root;
mmu->root.hpa = root;
goto set_root_pgd;
}
@ -3523,14 +3523,14 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
}
if (mmu->shadow_root_level == PT64_ROOT_5LEVEL)
mmu->root_hpa = __pa(mmu->pml5_root);
mmu->root.hpa = __pa(mmu->pml5_root);
else if (mmu->shadow_root_level == PT64_ROOT_4LEVEL)
mmu->root_hpa = __pa(mmu->pml4_root);
mmu->root.hpa = __pa(mmu->pml4_root);
else
mmu->root_hpa = __pa(mmu->pae_root);
mmu->root.hpa = __pa(mmu->pae_root);
set_root_pgd:
mmu->root_pgd = root_pgd;
mmu->root.pgd = root_pgd;
out_unlock:
write_unlock(&vcpu->kvm->mmu_lock);
@ -3643,13 +3643,13 @@ void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu)
if (vcpu->arch.mmu->direct_map)
return;
if (!VALID_PAGE(vcpu->arch.mmu->root_hpa))
if (!VALID_PAGE(vcpu->arch.mmu->root.hpa))
return;
vcpu_clear_mmio_info(vcpu, MMIO_GVA_ANY);
if (vcpu->arch.mmu->root_level >= PT64_ROOT_4LEVEL) {
hpa_t root = vcpu->arch.mmu->root_hpa;
hpa_t root = vcpu->arch.mmu->root.hpa;
sp = to_shadow_page(root);
if (!is_unsync_root(root))
@ -3934,7 +3934,7 @@ out_retry:
static bool is_page_fault_stale(struct kvm_vcpu *vcpu,
struct kvm_page_fault *fault, int mmu_seq)
{
struct kvm_mmu_page *sp = to_shadow_page(vcpu->arch.mmu->root_hpa);
struct kvm_mmu_page *sp = to_shadow_page(vcpu->arch.mmu->root.hpa);
/* Special roots, e.g. pae_root, are not backed by shadow pages. */
if (sp && is_obsolete_sp(vcpu->kvm, sp))
@ -4091,34 +4091,27 @@ static inline bool is_root_usable(struct kvm_mmu_root_info *root, gpa_t pgd,
/*
* Find out if a previously cached root matching the new pgd/role is available.
* The current root is also inserted into the cache.
* If a matching root was found, it is assigned to kvm_mmu->root_hpa and true is
* If a matching root was found, it is assigned to kvm_mmu->root.hpa and true is
* returned.
* Otherwise, the LRU root from the cache is assigned to kvm_mmu->root_hpa and
* Otherwise, the LRU root from the cache is assigned to kvm_mmu->root.hpa and
* false is returned. This root should now be freed by the caller.
*/
static bool cached_root_available(struct kvm_vcpu *vcpu, gpa_t new_pgd,
union kvm_mmu_page_role new_role)
{
uint i;
struct kvm_mmu_root_info root;
struct kvm_mmu *mmu = vcpu->arch.mmu;
root.pgd = mmu->root_pgd;
root.hpa = mmu->root_hpa;
if (is_root_usable(&root, new_pgd, new_role))
if (is_root_usable(&mmu->root, new_pgd, new_role))
return true;
for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++) {
swap(root, mmu->prev_roots[i]);
swap(mmu->root, mmu->prev_roots[i]);
if (is_root_usable(&root, new_pgd, new_role))
if (is_root_usable(&mmu->root, new_pgd, new_role))
break;
}
mmu->root_hpa = root.hpa;
mmu->root_pgd = root.pgd;
return i < KVM_MMU_NUM_PREV_ROOTS;
}
@ -4174,7 +4167,7 @@ static void __kvm_mmu_new_pgd(struct kvm_vcpu *vcpu, gpa_t new_pgd,
*/
if (!new_role.direct)
__clear_sp_write_flooding_count(
to_shadow_page(vcpu->arch.mmu->root_hpa));
to_shadow_page(vcpu->arch.mmu->root.hpa));
}
void kvm_mmu_new_pgd(struct kvm_vcpu *vcpu, gpa_t new_pgd)
@ -5069,9 +5062,9 @@ out:
void kvm_mmu_unload(struct kvm_vcpu *vcpu)
{
kvm_mmu_free_roots(vcpu, &vcpu->arch.root_mmu, KVM_MMU_ROOTS_ALL);
WARN_ON(VALID_PAGE(vcpu->arch.root_mmu.root_hpa));
WARN_ON(VALID_PAGE(vcpu->arch.root_mmu.root.hpa));
kvm_mmu_free_roots(vcpu, &vcpu->arch.guest_mmu, KVM_MMU_ROOTS_ALL);
WARN_ON(VALID_PAGE(vcpu->arch.guest_mmu.root_hpa));
WARN_ON(VALID_PAGE(vcpu->arch.guest_mmu.root.hpa));
}
static bool need_remote_flush(u64 old, u64 new)
@ -5254,7 +5247,7 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 error_code,
int r, emulation_type = EMULTYPE_PF;
bool direct = vcpu->arch.mmu->direct_map;
if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root_hpa)))
if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root.hpa)))
return RET_PF_RETRY;
r = RET_PF_INVALID;
@ -5326,7 +5319,7 @@ void kvm_mmu_invalidate_gva(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
return;
if (root_hpa == INVALID_PAGE) {
mmu->invlpg(vcpu, gva, mmu->root_hpa);
mmu->invlpg(vcpu, gva, mmu->root.hpa);
/*
* INVLPG is required to invalidate any global mappings for the VA,
@ -5362,7 +5355,7 @@ void kvm_mmu_invpcid_gva(struct kvm_vcpu *vcpu, gva_t gva, unsigned long pcid)
uint i;
if (pcid == kvm_get_active_pcid(vcpu)) {
mmu->invlpg(vcpu, gva, mmu->root_hpa);
mmu->invlpg(vcpu, gva, mmu->root.hpa);
tlb_flush = true;
}
@ -5475,8 +5468,8 @@ static int __kvm_mmu_create(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu)
struct page *page;
int i;
mmu->root_hpa = INVALID_PAGE;
mmu->root_pgd = 0;
mmu->root.hpa = INVALID_PAGE;
mmu->root.pgd = 0;
for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++)
mmu->prev_roots[i] = KVM_MMU_ROOT_INFO_INVALID;

2
arch/x86/kvm/mmu/paging_tmpl.h
View File

@ -668,7 +668,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault,
if (FNAME(gpte_changed)(vcpu, gw, top_level))
goto out_gpte_changed;
if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root_hpa)))
if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root.hpa)))
goto out_gpte_changed;
for (shadow_walk_init(&it, vcpu, fault->addr);

2
arch/x86/kvm/mmu/tdp_mmu.c
View File

@ -657,7 +657,7 @@ static inline void tdp_mmu_set_spte_no_dirty_log(struct kvm *kvm,
else
#define tdp_mmu_for_each_pte(_iter, _mmu, _start, _end) \
for_each_tdp_pte(_iter, to_shadow_page(_mmu->root_hpa), _start, _end)
for_each_tdp_pte(_iter, to_shadow_page(_mmu->root.hpa), _start, _end)
/*
* Yield if the MMU lock is contended or this thread needs to return control

2
arch/x86/kvm/mmu/tdp_mmu.h
View File

@ -95,7 +95,7 @@ static inline bool is_tdp_mmu_page(struct kvm_mmu_page *sp) { return sp->tdp_mmu
static inline bool is_tdp_mmu(struct kvm_mmu *mmu)
{
struct kvm_mmu_page *sp;
hpa_t hpa = mmu->root_hpa;
hpa_t hpa = mmu->root.hpa;
if (WARN_ON(!VALID_PAGE(hpa)))
return false;

2
arch/x86/kvm/vmx/nested.c
View File

@ -5466,7 +5466,7 @@ static int handle_invept(struct kvm_vcpu *vcpu)
VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
roots_to_free = 0;
if (nested_ept_root_matches(mmu->root_hpa, mmu->root_pgd,
if (nested_ept_root_matches(mmu->root.hpa, mmu->root.pgd,
operand.eptp))
roots_to_free |= KVM_MMU_ROOT_CURRENT;

2
arch/x86/kvm/vmx/vmx.c
View File

@ -2952,7 +2952,7 @@ static inline int vmx_get_current_vpid(struct kvm_vcpu *vcpu)
static void vmx_flush_tlb_current(struct kvm_vcpu *vcpu)
{
struct kvm_mmu *mmu = vcpu->arch.mmu;
u64 root_hpa = mmu->root_hpa;
u64 root_hpa = mmu->root.hpa;
/* No flush required if the current context is invalid. */
if (!VALID_PAGE(root_hpa))

2
arch/x86/kvm/x86.c
View File

@ -764,7 +764,7 @@ bool kvm_inject_emulated_page_fault(struct kvm_vcpu *vcpu,
if ((fault->error_code & PFERR_PRESENT_MASK) &&
!(fault->error_code & PFERR_RSVD_MASK))
kvm_mmu_invalidate_gva(vcpu, fault_mmu, fault->address,
fault_mmu->root_hpa);
fault_mmu->root.hpa);
fault_mmu->inject_page_fault(vcpu, fault);
return fault->nested_page_fault;