linux-kernel - Re: [PATCH kernel v2 3/3] x86/sev: Do not handle #VC for DR7 read/write

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Message-ID: <Y73E0aUFXkmQGDgX@zn.tnic>
Date:   Tue, 10 Jan 2023 21:04:33 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Alexey Kardashevskiy <aik@....com>
Cc:     kvm@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org,
        Venu Busireddy <venu.busireddy@...cle.com>,
        Tony Luck <tony.luck@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sean Christopherson <seanjc@...gle.com>,
        Sandipan Das <sandipan.das@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Michael Roth <michael.roth@....com>,
        Mario Limonciello <mario.limonciello@....com>,
        Jan Kara <jack@...e.cz>, Ingo Molnar <mingo@...hat.com>,
        Huang Rui <ray.huang@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH kernel v2 3/3] x86/sev: Do not handle #VC for DR7
 read/write

On Fri, Dec 09, 2022 at 03:38:04PM +1100, Alexey Kardashevskiy wrote:
> With MSR_AMD64_SEV_DEBUG_SWAP enabled, the VM should not get #VC
> events for DR7 read/write which it rather avoided.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@....com>
> ---
> Changes:
> v2:
> * use new bit definition
> ---
>  arch/x86/include/asm/msr-index.h       | 1 +
>  tools/arch/x86/include/asm/msr-index.h | 1 +
>  arch/x86/kernel/sev.c                  | 6 ++++++
>  3 files changed, 8 insertions(+)

Reviewed-by: Borislav Petkov (AMD) <bp@...en8.de>

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette