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KVM: Add kvm_release_page_unused() API to put pages that KVM never consumes

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Add an API to release an unused page, i.e. to put a page without marking
it accessed or dirty.  The API will be used when KVM faults-in a page but
bails before installing the guest mapping (and other similar flows).

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
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: <20241010182427.1434605-4-seanjc@google.com>
This commit is contained in:
Sean Christopherson
2024-10-10 11:23:05 -07:00
committed by Paolo Bonzini
parent 85e88b2bba
commit 3af91068b7
1 changed files with 9 additions and 0 deletions
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9
include/linux/kvm_host.h
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@@ -1216,6 +1216,15 @@ unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable);
unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, gfn_t gfn,
bool *writable);
static inline void kvm_release_page_unused(struct page *page)
{
if (!page)
return;
put_page(page);
}
void kvm_release_page_clean(struct page *page);
void kvm_release_page_dirty(struct page *page);