linux-kernel - [PATCH 0/2] x86/kvm: Enable MCE injection in the guest v2

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Date:   Thu, 28 Jun 2018 19:38:06 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     KVM <kvm@...r.kernel.org>
Cc:     Joerg Roedel <joro@...tes.org>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Tony Luck <tony.luck@...el.com>,
        Yazen Ghannam <Yazen.Ghannam@....com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/2] x86/kvm: Enable MCE injection in the guest v2

From: Borislav Petkov <bp@...e.de>

Hi all,

here's v2, dropping patch 3 and incorporating hopefully all of Radim's
feedback.

Thx.

v1 cover letter:

there's this mce-inject.ko module in the kernel which allows for
injecting real MCEs and thus test the MCE handling code.

It is doubly useful to be able to inject same MCEs in a guest so that
testing of the MCE handling code can happen even easier/faster. In order
to be able to do that on an AMD guest, we need to emulate some bits
and pieces like the HWCR[McStatusWrEn] bit which allows writes to the
MCi_STATUS registers without a #GP.

The below does that and with it I'm able to properly inject MCEs in said
guest.

Borislav Petkov (2):
  kvm/x86: Move MSR_K7_HWCR to svm.c
  x86/kvm: Implement MSR_HWCR support

 arch/x86/kvm/svm.c | 20 ++++++++++++++++++++
 arch/x86/kvm/x86.c | 46 +++++++++++++++++++++++++++++++---------------
 2 files changed, 51 insertions(+), 15 deletions(-)

-- 
2.17.0.582.gccdcbd54c