linux-kernel - Re: [Part1 PATCH v4 17/17] X86/KVM: Clear encryption attribute when SEV is active

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Message-ID: <20170919114746.GO4733@nazgul.tnic>
Date:   Tue, 19 Sep 2017 13:47:46 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, kvm@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Subject: Re: [Part1 PATCH v4 17/17] X86/KVM: Clear encryption attribute when
 SEV is active

On Sat, Sep 16, 2017 at 07:34:18AM -0500, Brijesh Singh wrote:
> The guest physical memory area holding the struct pvclock_wall_clock and
> struct pvclock_vcpu_time_info are shared with the hypervisor. Hypervisor

						the hypervisor. It ...

> periodically updates the contents of the memory. When SEV is active, we
> must clear the encryption attributes from the shared memory pages so that
> both hypervisor and guest can access the data.
> 
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Borislav Petkov <bp@...e.de>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: "Radim Krčmář" <rkrcmar@...hat.com>
> Cc: Tom Lendacky <thomas.lendacky@....com>
> Cc: x86@...nel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: kvm@...r.kernel.org
> Signed-off-by: Brijesh Singh <brijesh.singh@....com>
> ---
>  arch/x86/entry/vdso/vma.c  |  5 ++--
>  arch/x86/kernel/kvmclock.c | 65 ++++++++++++++++++++++++++++++++++++++--------
>  2 files changed, 57 insertions(+), 13 deletions(-)

Otherwise:

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--