From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brijesh Singh Subject: [PATCH] x86/efi: Access EFI MMIO data as unencrypted when SEV is active Date: Tue, 3 Jul 2018 08:32:00 -0500 Message-ID: <1530624720-32004-1-git-send-email-brijesh.singh@amd.com> Mime-Version: 1.0 Content-Type: text/plain Cc: Brijesh Singh , Tom Lendacky , Thomas Gleixner , Borislav Petkov , kvm@vger.kernel.org, Ard Biesheuvel , Matt Fleming , Andy Lutomirski , "# 4 . 15 . x" To: x86@kernel.org, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org SEV guest fails to update the UEFI runtime variables stored in the flash. commit 1379edd59673 ("x86/efi: Access EFI data as encrypted when SEV is active") unconditionally maps all the UEFI runtime data as 'encrypted' (C=1). When SEV is active the UEFI runtime data marked as EFI_MEMORY_MAPPED_IO should be mapped as 'unencrypted' so that both guest and hypervisor can access the data. Fixes: 1379edd59673 (x86/efi: Access EFI data as encrypted ...) Cc: Tom Lendacky Cc: Thomas Gleixner Cc: Borislav Petkov Cc: linux-efi@vger.kernel.org Cc: kvm@vger.kernel.org Cc: Ard Biesheuvel Cc: Matt Fleming Cc: Andy Lutomirski Cc: # 4.15.x Signed-off-by: Brijesh Singh --- arch/x86/platform/efi/efi_64.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c index 77873ce..5f2eb32 100644 --- a/arch/x86/platform/efi/efi_64.c +++ b/arch/x86/platform/efi/efi_64.c @@ -417,7 +417,7 @@ static void __init __map_region(efi_memory_desc_t *md, u64 va) if (!(md->attribute & EFI_MEMORY_WB)) flags |= _PAGE_PCD; - if (sev_active()) + if (sev_active() && md->type != EFI_MEMORY_MAPPED_IO) flags |= _PAGE_ENC; pfn = md->phys_addr >> PAGE_SHIFT; -- 2.7.4