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

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Date:   Fri, 6 Jul 2018 16:34:59 +0000
From:   "Ghannam, Yazen" <Yazen.Ghannam@....com>
To:     Borislav Petkov <bp@...en8.de>, KVM <kvm@...r.kernel.org>
CC:     Joerg Roedel <joro@...tes.org>,
        Radim Krčmář <rkrcmar@...hat.com>,
        "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        Tony Luck <tony.luck@...el.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 0/2] x86/kvm: Enable MCE injection in the guest v2

> -----Original Message-----
> From: Borislav Petkov <bp@...en8.de>
> Sent: Thursday, June 28, 2018 1:38 PM
> To: KVM <kvm@...r.kernel.org>
> Cc: Joerg Roedel <joro@...tes.org>; Radim Krčmář <rkrcmar@...hat.com>;
> Lendacky, Thomas <Thomas.Lendacky@....com>; Tony Luck
> <tony.luck@...el.com>; Ghannam, Yazen <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(-)
> 

Tested-by: Yazen Ghannam <yazen.ghannam@....com>

Thanks!

-Yazen