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KVM: x86/mmu: Refactor TDP MMU iter need resched check

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Refactor the TDP MMU iterator "need resched" checks into a helper
function so they can be called from a different code path in a
subsequent commit.

No functional change intended.

Signed-off-by: David Matlack <dmatlack@google.com>
Link: https://lore.kernel.org/r/20240823235648.3236880-4-dmatlack@google.com
[sean: rebase on a swapped order of checks]
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2024-10-30 17:00:23 -07:00
parent 38b0ac4716
commit dd2e7dbc4a
1 changed files with 11 additions and 5 deletions
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16
arch/x86/kvm/mmu/tdp_mmu.c
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@@ -638,6 +638,16 @@ static inline void tdp_mmu_iter_set_spte(struct kvm *kvm, struct tdp_iter *iter,
#define tdp_mmu_for_each_pte(_iter, _mmu, _start, _end) \
for_each_tdp_pte(_iter, root_to_sp(_mmu->root.hpa), _start, _end)
static inline bool __must_check tdp_mmu_iter_need_resched(struct kvm *kvm,
struct tdp_iter *iter)
{
if (!need_resched() && !rwlock_needbreak(&kvm->mmu_lock))
return false;
/* Ensure forward progress has been made before yielding. */
return iter->next_last_level_gfn != iter->yielded_gfn;
}
/*
* Yield if the MMU lock is contended or this thread needs to return control
* to the scheduler.
@@ -658,11 +668,7 @@ static inline bool __must_check tdp_mmu_iter_cond_resched(struct kvm *kvm,
{
KVM_MMU_WARN_ON(iter->yielded);
if (!need_resched() && !rwlock_needbreak(&kvm->mmu_lock))
return false;
/* Ensure forward progress has been made before yielding. */
if (iter->next_last_level_gfn == iter->yielded_gfn)
if (!tdp_mmu_iter_need_resched(kvm, iter))
return false;
if (flush)