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| author | Sean Christopherson <seanjc@google.com> | 2022-04-29 21:00:21 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-05-25 05:23:41 -0400 |
| commit | 3dddf65b4f4c451c345d34ae85bdf1791a746e49 (patch) | |
| tree | 8b068db831c9b8db6a179763a710adec69a75469 /virt/kvm | |
| parent | 345b0fd6fe5f66dfe841bad0b39dd11a5672df68 (diff) | |
| download | linux-3dddf65b4f4c451c345d34ae85bdf1791a746e49.tar.gz linux-3dddf65b4f4c451c345d34ae85bdf1791a746e49.tar.bz2 linux-3dddf65b4f4c451c345d34ae85bdf1791a746e49.zip | |
KVM: Put the extra pfn reference when reusing a pfn in the gpc cache
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: 982ed0de4753 ("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>
Diffstat (limited to 'virt/kvm')
| -rw-r--r-- | virt/kvm/pfncache.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/virt/kvm/pfncache.c b/virt/kvm/pfncache.c index e05a6a1b8eff..40cbe90d52e0 100644 --- a/virt/kvm/pfncache.c +++ b/virt/kvm/pfncache.c @@ -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; |