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Re: [Xen-devel] [PATCH v7 18/36] x86/efi: Update EFI pagetable creation to work with SME
- To: Tom Lendacky <thomas.lendacky@xxxxxxx>
- From: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
- Date: Thu, 22 Jun 2017 11:58:30 +0100
- Cc: linux-efi@xxxxxxxxxxxxxxx, Brijesh Singh <brijesh.singh@xxxxxxx>, Toshimitsu Kani <toshi.kani@xxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, linux-mm@xxxxxxxxx, Radim Krčmář <rkrcmar@xxxxxxxxxx>, Alexander Potapenko <glider@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Larry Woodman <lwoodman@xxxxxxxxxx>, linux-arch@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, Jonathan Corbet <corbet@xxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, kasan-dev@xxxxxxxxxxxxxxxx, Ingo Molnar <mingo@xxxxxxxxxx>, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>, Dave Young <dyoung@xxxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, kexec@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>
- Delivery-date: Thu, 22 Jun 2017 10:58:36 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On Fri, 16 Jun, at 01:53:17PM, Tom Lendacky wrote:
> When SME is active, pagetable entries created for EFI need to have the
> encryption mask set as necessary.
>
> When the new pagetable pages are allocated they are mapped encrypted. So,
> update the efi_pgt value that will be used in cr3 to include the encryption
> mask so that the PGD table can be read successfully. The pagetable mapping
> as well as the kernel are also added to the pagetable mapping as encrypted.
> All other EFI mappings are mapped decrypted (tables, etc.).
>
> Reviewed-by: Borislav Petkov <bp@xxxxxxx>
> Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
> ---
> arch/x86/platform/efi/efi_64.c | 15 +++++++++++----
> 1 file changed, 11 insertions(+), 4 deletions(-)
Reviewed-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
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