This is a note to let you know that I've just added the patch titled

KVM: x86: Fix device passthrough when SME is active

to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: kvm-x86-fix-device-passthrough-when-sme-is-active.patch and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From daaf216c06fba4ee4dc3f62715667da929d68774 Mon Sep 17 00:00:00 2001

From: Tom Lendacky thomas.lendacky@amd.com Date: Thu, 8 Mar 2018 17:17:31 -0600 Subject: KVM: x86: Fix device passthrough when SME is active

From: Tom Lendacky thomas.lendacky@amd.com

commit daaf216c06fba4ee4dc3f62715667da929d68774 upstream.

When using device passthrough with SME active, the MMIO range that is mapped for the device should not be mapped encrypted. Add a check in set_spte() to insure that a page is not mapped encrypted if that page is a device MMIO page as indicated by kvm_is_mmio_pfn().

Cc: stable@vger.kernel.org # 4.14.x- Signed-off-by: Tom Lendacky thomas.lendacky@amd.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- arch/x86/kvm/mmu.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2758,8 +2758,10 @@ static int set_spte(struct kvm_vcpu *vcp else pte_access &= ~ACC_WRITE_MASK;

+ if (!kvm_is_mmio_pfn(pfn)) + spte |= shadow_me_mask; + spte |= (u64)pfn << PAGE_SHIFT; - spte |= shadow_me_mask;

if (pte_access & ACC_WRITE_MASK) {

Patches currently in stable-queue which might be from thomas.lendacky@amd.com are

queue-4.15/kvm-x86-fix-device-passthrough-when-sme-is-active.patch queue-4.15/x86-cpufeatures-add-intel-pconfig-cpufeature.patch queue-4.15/x86-cpufeatures-add-intel-total-memory-encryption-cpufeature.patch