linux-kernel - Re: [Part1 PATCH v6.1 16/17] X86/KVM: Decrypt shared per-cpu variables when SEV is active

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Date:   Thu, 19 Oct 2017 17:40:06 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Tom Lendacky <thomas.lendacky@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [Part1 PATCH v6.1 16/17] X86/KVM: Decrypt shared per-cpu
 variables when SEV is active

On Thu, Oct 19, 2017 at 08:44:44AM -0500, Brijesh Singh wrote:
> When SEV is active, guest memory is encrypted with a guest-specific key, a
> guest memory region shared with the hypervisor must be mapped as decrypted
> before we can share it.
> 
> 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>
> ---
> 
> Changes since v6:
>  * use virtual address when call early_set_memory_decrypted()
> 
>  arch/x86/kernel/kvm.c | 40 +++++++++++++++++++++++++++++++++++++---
>  1 file changed, 37 insertions(+), 3 deletions(-)

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

-- 
Regards/Gruss,
    Boris.

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