Re: [PATCH Part1 v5 38/38] virt: sevguest: Add support to get extended report
From: Dov Murik <hidden>
Date: 2021-08-31 20:23:18
Also in:
kvm, linux-efi, linux-mm, lkml, platform-driver-x86
Hi Brijesh, On 20/08/2021 18:19, Brijesh Singh wrote:
Version 2 of GHCB specification defines NAE to get the extended guest request. It is similar to the SNP_GET_REPORT ioctl. The main difference is related to the additional data that be returned. The additional data returned is a certificate blob that can be used by the SNP guest user.
It seems like the SNP_GET_EXT_REPORT ioctl does everything that the SNP_GET_REPORT ioctl does, and more. Why expose SNP_GET_REPORT to userspace at all? -Dov
The certificate blob layout is defined in the GHCB specification. The driver simply treats the blob as a opaque data and copies it to userspace. Signed-off-by: Brijesh Singh <redacted> --- Documentation/virt/coco/sevguest.rst | 22 +++++ drivers/virt/coco/sevguest/sevguest.c | 126 ++++++++++++++++++++++++++ include/uapi/linux/sev-guest.h | 13 +++ 3 files changed, 161 insertions(+)
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