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KVM: x86/mmu: Refactor low-level TDP MMU set SPTE helper to take raw values

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Refactor __tdp_mmu_set_spte() to work with raw values instead of a
tdp_iter objects so that a future patch can modify SPTEs without doing a
walk, and without having to synthesize a tdp_iter.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Ben Gardon <bgardon@google.com>
Message-Id: <20220226001546.360188-13-seanjc@google.com>
Reviewed-by: Mingwei Zhang <mizhang@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-02-26 00:15:30 +00:00 committed by Paolo Bonzini
parent 966da62ada
commit 626808d137
1 changed files with 31 additions and 20 deletions
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51
arch/x86/kvm/mmu/tdp_mmu.c
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@ -603,9 +603,13 @@ static inline int tdp_mmu_zap_spte_atomic(struct kvm *kvm,
/*
* __tdp_mmu_set_spte - Set a TDP MMU SPTE and handle the associated bookkeeping
* @kvm: kvm instance
* @iter: a tdp_iter instance currently on the SPTE that should be set
* @new_spte: The value the SPTE should be set to
* @kvm: KVM instance
* @as_id: Address space ID, i.e. regular vs. SMM
* @sptep: Pointer to the SPTE
* @old_spte: The current value of the SPTE
* @new_spte: The new value that will be set for the SPTE
* @gfn: The base GFN that was (or will be) mapped by the SPTE
* @level: The level _containing_ the SPTE (its parent PT's level)
* @record_acc_track: Notify the MM subsystem of changes to the accessed state
* of the page. Should be set unless handling an MMU
* notifier for access tracking. Leaving record_acc_track
@ -617,12 +621,10 @@ static inline int tdp_mmu_zap_spte_atomic(struct kvm *kvm,
* Leaving record_dirty_log unset in that case prevents page
* writes from being double counted.
*/
static inline void __tdp_mmu_set_spte(struct kvm *kvm, struct tdp_iter *iter,
u64 new_spte, bool record_acc_track,
bool record_dirty_log)
static void __tdp_mmu_set_spte(struct kvm *kvm, int as_id, tdp_ptep_t sptep,
u64 old_spte, u64 new_spte, gfn_t gfn, int level,
bool record_acc_track, bool record_dirty_log)
{
WARN_ON_ONCE(iter->yielded);
lockdep_assert_held_write(&kvm->mmu_lock);
/*
@ -632,39 +634,48 @@ static inline void __tdp_mmu_set_spte(struct kvm *kvm, struct tdp_iter *iter,
* should be used. If operating under the MMU lock in write mode, the
* use of the removed SPTE should not be necessary.
*/
WARN_ON(is_removed_spte(iter->old_spte) || is_removed_spte(new_spte));
WARN_ON(is_removed_spte(old_spte) || is_removed_spte(new_spte));
kvm_tdp_mmu_write_spte(iter->sptep, new_spte);
kvm_tdp_mmu_write_spte(sptep, new_spte);
__handle_changed_spte(kvm, as_id, gfn, old_spte, new_spte, level, false);
__handle_changed_spte(kvm, iter->as_id, iter->gfn, iter->old_spte,
new_spte, iter->level, false);
if (record_acc_track)
handle_changed_spte_acc_track(iter->old_spte, new_spte,
iter->level);
handle_changed_spte_acc_track(old_spte, new_spte, level);
if (record_dirty_log)
handle_changed_spte_dirty_log(kvm, iter->as_id, iter->gfn,
iter->old_spte, new_spte,
iter->level);
handle_changed_spte_dirty_log(kvm, as_id, gfn, old_spte,
new_spte, level);
}
static inline void _tdp_mmu_set_spte(struct kvm *kvm, struct tdp_iter *iter,
u64 new_spte, bool record_acc_track,
bool record_dirty_log)
{
WARN_ON_ONCE(iter->yielded);
__tdp_mmu_set_spte(kvm, iter->as_id, iter->sptep, iter->old_spte,
new_spte, iter->gfn, iter->level,
record_acc_track, record_dirty_log);
}
static inline void tdp_mmu_set_spte(struct kvm *kvm, struct tdp_iter *iter,
u64 new_spte)
{
__tdp_mmu_set_spte(kvm, iter, new_spte, true, true);
_tdp_mmu_set_spte(kvm, iter, new_spte, true, true);
}
static inline void tdp_mmu_set_spte_no_acc_track(struct kvm *kvm,
struct tdp_iter *iter,
u64 new_spte)
{
__tdp_mmu_set_spte(kvm, iter, new_spte, false, true);
_tdp_mmu_set_spte(kvm, iter, new_spte, false, true);
}
static inline void tdp_mmu_set_spte_no_dirty_log(struct kvm *kvm,
struct tdp_iter *iter,
u64 new_spte)
{
__tdp_mmu_set_spte(kvm, iter, new_spte, true, false);
_tdp_mmu_set_spte(kvm, iter, new_spte, true, false);
}
#define tdp_root_for_each_pte(_iter, _root, _start, _end) \