linux-kernel - [PATCH v2 0/8] x86/sev-es: Fixes for SEV-ES Guest Support

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Date:   Wed, 19 May 2021 15:52:43 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     x86@...nel.org, Hyunwook Baek <baekhw@...gle.com>
Cc:     Joerg Roedel <joro@...tes.org>, Joerg Roedel <jroedel@...e.de>,
        hpa@...or.com, Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Slaby <jslaby@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Juergen Gross <jgross@...e.com>,
        Kees Cook <keescook@...omium.org>,
        David Rientjes <rientjes@...gle.com>,
        Cfir Cohen <cfir@...gle.com>,
        Erdem Aktas <erdemaktas@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mike Stunes <mstunes@...are.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Martin Radev <martin.b.radev@...il.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        linux-coco@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: [PATCH v2 0/8] x86/sev-es: Fixes for SEV-ES Guest Support

From: Joerg Roedel <jroedel@...e.de>

Hi,

here is the second version of my pending SEV-ES fixes. The most
important patches are patch 1 to 5, as they fix warnings and splats
that trigger with various debugging options are enabled.

Patches 6 to 8 fix a correctness issue in the instruction emulation
part of the #VC exception handler.

Please review.

Thanks,

	Joerg

Link to v1: https://lore.kernel.org/lkml/20210512075445.18935-1-joro@8bytes.org/

Changes since v1:

	- Documented why __get_user()/__put_user() are safe to use in
	  the #VC handlers memory access path.

	- Merged the revert into patch 3

	- Refactored code in the instruction decoder and added #GP
	  reporting when getting the instructions linear address fails.

Joerg Roedel (8):
  x86/sev-es: Don't return NULL from sev_es_get_ghcb()
  x86/sev-es: Forward page-faults which happen during emulation
  x86/sev-es: Use __put_user()/__get_user() for data accesses
  x86/sev-es: Fix error message in runtime #VC handler
  x86/sev-es: Leave NMI-mode before sending signals
  x86/insn-eval: Make 0 a valid RIP for insn_get_effective_ip()
  x86/insn: Extend error reporting from
    insn_fetch_from_user[_inatomic]()
  x86/sev-es: Propagate #GP if getting linear instruction address failed

 arch/x86/include/asm/insn-eval.h |   6 +-
 arch/x86/kernel/sev.c            | 127 +++++++++++++++++++++----------
 arch/x86/kernel/umip.c           |  10 +--
 arch/x86/lib/insn-eval.c         |  52 ++++++++-----
 4 files changed, 129 insertions(+), 66 deletions(-)


base-commit: a50c5bebc99c525e7fbc059988c6a5ab8680cb76
-- 
2.31.1