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

[Ghannam, Yazen]

> -----Original Message-----
> From: Borislav Petkov <bp@xxxxxxxxx>
> Sent: Thursday, June 28, 2018 1:38 PM
> To: KVM <kvm@xxxxxxxxxxxxxxx>
> Cc: Joerg Roedel <joro@xxxxxxxxxx>; Radim Krčmář <rkrcmar@xxxxxxxxxx>;
> Lendacky, Thomas <Thomas.Lendacky@xxxxxxx>; Tony Luck
> <tony.luck@xxxxxxxxx>; Ghannam, Yazen <Yazen.Ghannam@xxxxxxx>; LKML
> <linux-kernel@xxxxxxxxxxxxxxx>
> Subject: [PATCH 0/2] x86/kvm: Enable MCE injection in the guest v2
> 
> From: Borislav Petkov <bp@xxxxxxx>
> 
> 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@xxxxxxx>

Thanks!

-Yazen