linux-kernel - [PATCH v4 0/2] x86/sev: Fix AP Jump Table handling for SNP guests

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Date:   Tue, 26 Apr 2022 09:21:45 -0500
From:   Michael Roth <michael.roth@....com>
To:     <linux-kernel@...r.kernel.org>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, <x86@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        Kees Cook <keescook@...omium.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        "Nick Desaulniers" <ndesaulniers@...gle.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Venu Busireddy <venu.busireddy@...cle.com>,
        "Joerg Roedel" <jroedel@...e.de>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>
Subject: [PATCH v4 0/2] x86/sev: Fix AP Jump Table handling for SNP guests

This series is based on tip/master (commit 1912a07f8a)

SNP guests should only retrieve the AP Jump Table address from the
secrets page, not via a GHCB request as with SEV-ES guests. This series
reworks the handling accordingly, and fixes up some __init annotations
for some of the SEV routines touched by that rework.

v4:
 - Improve commit msg for patch 2 (Tom)

v3:
 - Address missing __init annotations (Boris)

v2:
 - add handling for memremap()/ioremap() failures (Boris)
 - don't mix function calls with declarations (Boris)

 arch/x86/include/asm/sev.h              | 35 +++++++++++++++++++++++++++++++++++
 arch/x86/kernel/sev.c                   | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++++++--------------------------
 arch/x86/realmode/init.c                |  2 +-
 drivers/virt/coco/sev-guest/sev-guest.h | 35 -----------------------------------
 4 files changed, 90 insertions(+), 62 deletions(-)