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KVM: Put the extra pfn reference when reusing a pfn in the gpc cache 

commit 3dddf65b4f upstream.

Put the struct page reference to pfn acquired by hva_to_pfn() when the
old and new pfns for a gfn=>pfn cache match.  The cache already has a
reference via the old/current pfn, and will only put one reference when
the cache is done with the pfn.

Fixes: 982ed0de47 ("KVM: Reinstate gfn_to_pfn_cache with invalidation support")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220429210025.3293691-5-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Christopherson 2022-04-29 21:00:21 +00:00 committed by Greg Kroah-Hartman
parent 81b640cc9b
commit 391931dafc
1 changed files with 8 additions and 0 deletions
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8
virt/kvm/pfncache.c
View File

@ -206,6 +206,14 @@ int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struct gfn_to_pfn_cache *gpc,
if (gpc->usage & KVM_HOST_USES_PFN) {
if (new_pfn == old_pfn) {
/*
* Reuse the existing pfn and khva, but put the
* reference acquired hva_to_pfn_retry(); the
* cache still holds a reference to the pfn
* from the previous refresh.
*/
gpc_release_pfn_and_khva(kvm, new_pfn, NULL);
new_khva = old_khva;
old_pfn = KVM_PFN_ERR_FAULT;
old_khva = NULL;