Patch "KVM: x86: Fix device passthrough when SME is active" has been added to the 4.14-stable tree
Subsystems (3)
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 4.14-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-x86-fix-device-passthrough-when-sme-is-active.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.
Quoted 1 line
From
daaf216c06fba4ee4dc3f62715667da929d68774Mon Sep 17 00:00:00 2001
From: Tom Lendacky <[email protected]>
Date: Thu, 8 Mar 2018 17:17:31 -0600
Subject: KVM: x86: Fix device passthrough when SME is active
From: Tom Lendacky <[email protected]>
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().
--- arch/x86/kvm/mmu.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
arch/x86/kvm/mmu.c +3 -1
@@ -2758,8 +2758,10 @@ static int set_spte(struct kvm_vcpu *vcpelse 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 [email protected] are
queue-4.14/kvm-x86-fix-device-passthrough-when-sme-is-active.patch queue-4.14/x86-cpufeatures-add-intel-pconfig-cpufeature.patch queue-4.14/x86-cpufeatures-add-intel-total-memory-encryption-cpufeature.patch