[PATCH v2 5/8] KVM: Do not incorporate page offset into gfn=>pfn cache user address

From: Sean Christopherson
Date: Tue Apr 26 2022 - 21:41:09 EST

Don't adjust the userspace address in the gfn=>pfn cache by the page
offset from the gpa. KVM should never use the user address directly, and
all KVM operations that translate a user address to something else
require the user address to be page aligned. Ignoring the offset will
allow the cache to reuse a gfn=>hva translation in the unlikely event
that the page offset of the gpa changes, but the gfn does not.

Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
virt/kvm/pfncache.c | 2 --
1 file changed, 2 deletions(-)

diff --git a/virt/kvm/pfncache.c b/virt/kvm/pfncache.c
index 40cbe90d52e0..05cb0bcbf662 100644
--- a/virt/kvm/pfncache.c
+++ b/virt/kvm/pfncache.c
@@ -179,8 +179,6 @@ int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struct gfn_to_pfn_cache *gpc,
ret = -EFAULT;
goto out;
- gpc->uhva += page_offset;