diff mbox series

[v2,14/16] KVM: Skip unnecessary "unmap" if gpc is already valid during refresh

Message ID 20221013211234.1318131-15-seanjc@google.com (mailing list archive)
State New, archived
Headers show
Series KVM: x86: gfn_to_pfn_cache fixes and cleanups | expand

Commit Message

Sean Christopherson Oct. 13, 2022, 9:12 p.m. UTC 
When refreshing a gfn=>pfn cache, skip straight to unlocking if the cache
already valid instead of stuffing the "old" variables to turn the
unmapping outro into a nop.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 virt/kvm/pfncache.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/virt/kvm/pfncache.c b/virt/kvm/pfncache.c
index f211c878788b..57d47f06637d 100644
--- a/virt/kvm/pfncache.c
+++ b/virt/kvm/pfncache.c
@@ -293,9 +293,8 @@  static int __kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, gpa_t gpa)
 		ret = hva_to_pfn_retry(gpc);
 	} else {
 		/* If the HVA→PFN mapping was already valid, don't unmap it. */
-		old_pfn = KVM_PFN_ERR_FAULT;
-		old_khva = NULL;
 		ret = 0;
+		goto out_unlock;
 	}
 
  out: