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KVM: x86/mmu: Put refcounted pages instead of blindly releasing pfns

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Now that all x86 page fault paths precisely track refcounted pages, use
Use kvm_page_fault.refcounted_page to put references to struct page memory
when finishing page faults.  This is a baby step towards eliminating
kvm_pfn_to_refcounted_page().

Tested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20241010182427.1434605-48-seanjc@google.com>
This commit is contained in:
Sean Christopherson
2024-10-10 11:23:49 -07:00
committed by Paolo Bonzini
parent 1fbee5b01a
commit 8dd861cc07
1 changed files with 5 additions and 2 deletions
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arch/x86/kvm/mmu/mmu.c
+5 -2
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@@ -4380,6 +4380,9 @@ static void kvm_mmu_finish_page_fault(struct kvm_vcpu *vcpu,
lockdep_assert_once(lockdep_is_held(&vcpu->kvm->mmu_lock) ||
r == RET_PF_RETRY);
if (!fault->refcounted_page)
return;
/*
* If the page that KVM got from the *primary MMU* is writable, and KVM
* installed or reused a SPTE, mark the page/folio dirty. Note, this
@@ -4391,9 +4394,9 @@ static void kvm_mmu_finish_page_fault(struct kvm_vcpu *vcpu,
* folio dirty if KVM could locklessly make the SPTE writable.
*/
if (!fault->map_writable || r == RET_PF_RETRY)
kvm_release_pfn_clean(fault->pfn);
kvm_release_page_clean(fault->refcounted_page);
else
kvm_release_pfn_dirty(fault->pfn);
kvm_release_page_dirty(fault->refcounted_page);
}
static int kvm_mmu_faultin_pfn_private(struct kvm_vcpu *vcpu,