Re: [PATCH] KVM: x86: Fix device passthrough when SME is active

[Tom Lendacky <thomas.lendacky@amd.com>]

On 3/8/2018 5:17 PM, Tom Lendacky wrote:
> 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>

Any concerns with this fix?

Thanks,
Tom

> ---
>  arch/x86/kvm/mmu.c |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
> index f551962..763bb3b 100644
> --- a/arch/x86/kvm/mmu.c
> +++ b/arch/x86/kvm/mmu.c
> @@ -2770,8 +2770,10 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
>  	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) {
>  
>