This is a note to let you know that I've just added the patch titled
KVM: Do not incorporate page offset into gfn=>pfn cache user address
to the 5.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-do-not-incorporate-page-offset-into-gfn-pfn-cache-user-address.patch
and it can be found in the queue-5.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3ba2c95ea180740b16281fa43a3ee5f47279c0ed Mon Sep 17 00:00:00 2001
From: Sean Christopherson <seanjc@xxxxxxxxxx>
Date: Fri, 29 Apr 2022 21:00:22 +0000
Subject: KVM: Do not incorporate page offset into gfn=>pfn cache user address
From: Sean Christopherson <seanjc@xxxxxxxxxx>
commit 3ba2c95ea180740b16281fa43a3ee5f47279c0ed upstream.
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@xxxxxxxxxxxxxxx
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Message-Id: <20220429210025.3293691-6-seanjc@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
virt/kvm/pfncache.c | 2 --
1 file changed, 2 deletions(-)
--- a/virt/kvm/pfncache.c
+++ b/virt/kvm/pfncache.c
@@ -274,8 +274,6 @@ int kvm_gfn_to_pfn_cache_refresh(struct
ret = -EFAULT;
goto out;
}
-
- gpc->uhva += page_offset;
}
/*
Patches currently in stable-queue which might be from seanjc@xxxxxxxxxx are
queue-5.19/kvm-x86-mmu-treat-nx-as-a-valid-spte-bit-for-npt.patch
queue-5.19/kvm-put-the-extra-pfn-reference-when-reusing-a-pfn-in-the-gpc-cache.patch
queue-5.19/kvm-drop-unused-gpa-param-from-gfn-pfn-cache-s-__release_gpc-helper.patch
queue-5.19/kvm-nvmx-let-userspace-set-nvmx-msr-to-any-_host_-supported-value.patch
queue-5.19/kvm-x86-set-error-code-to-segment-selector-on-lldt-ltr-non-canonical-gp.patch
queue-5.19/kvm-nvmx-inject-ud-if-vmxon-is-attempted-with-incompatible-cr0-cr4.patch
queue-5.19/kvm-do-not-incorporate-page-offset-into-gfn-pfn-cache-user-address.patch
queue-5.19/kvm-svm-don-t-bug-if-userspace-injects-an-interrupt-with-gif-0.patch
queue-5.19/kvm-nvmx-snapshot-pre-vm-enter-bndcfgs-for-nested_run_pending-case.patch
queue-5.19/kvm-x86-split-kvm_is_valid_cr4-and-export-only-the-non-vendor-bits.patch
queue-5.19/kvm-fix-multiple-races-in-gfn-pfn-cache-refresh.patch
queue-5.19/kvm-fully-serialize-gfn-pfn-cache-refresh-via-mutex.patch
queue-5.19/kvm-x86-mark-tss-busy-during-ltr-emulation-_after_-all-fault-checks.patch
queue-5.19/kvm-nvmx-account-for-kvm-reserved-cr4-bits-in-consistency-checks.patch
queue-5.19/kvm-nvmx-snapshot-pre-vm-enter-debugctl-for-nested_run_pending-case.patch
