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KVM: Skip unnecessary "unmap" if gpc is already valid during refresh

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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>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
This commit is contained in:
Sean Christopherson 2022-10-13 21:12:32 +00:00 committed by David Woodhouse
parent 58f5ee5fed
commit 06e155c44a
1 changed files with 1 additions and 2 deletions
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3
virt/kvm/pfncache.c
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@ -301,9 +301,8 @@ static int __kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, gpa_t gpa,
* may have changed.
*/
gpc->khva = old_khva + page_offset;
old_pfn = KVM_PFN_ERR_FAULT;
old_khva = NULL;
ret = 0;
goto out_unlock;
}
out: