From 3ba2c95ea180740b16281fa43a3ee5f47279c0ed Mon Sep 17 00:00:00 2001 From: Sean Christopherson <seanjc@google.com> Date: Fri, 29 Apr 2022 21:00:22 +0000 Subject: [PATCH] KVM: Do not incorporate page offset into gfn=>pfn cache user address 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. And more importantly, not having to (un)adjust the user address will simplify a future bug fix. Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20220429210025.3293691-6-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> --- virt/kvm/pfncache.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/virt/kvm/pfncache.c b/virt/kvm/pfncache.c index 40cbe90d52e04..05cb0bcbf662a 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; } /* -- GitLab