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Message-ID: <74de50ac-6b10-a268-06f0-70a498e8b42d@intel.com>
Date:   Wed, 11 Jan 2023 14:29:20 -0800
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Subject: Re: [PATCH v6 6/7] x86/cpu: Support AMD Automatic IBRS
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To:     Kim Phillips <kim.phillips@amd.com>, x86@kernel.org
Cc:     Borislav Petkov <bp@alien8.de>,
        Borislav Petkov <borislav.petkov@amd.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
        Joao Martins <joao.m.martins@oracle.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Sean Christopherson <seanjc@google.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        David Woodhouse <dwmw@amazon.co.uk>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Juergen Gross <jgross@suse.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Tony Luck <tony.luck@intel.com>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        Alexey Kardashevskiy <aik@amd.com>, kvm@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20230110224643.452273-1-kim.phillips@amd.com>
 <20230110224643.452273-8-kim.phillips@amd.com>
From:   Dave Hansen <dave.hansen@intel.com>
In-Reply-To: <20230110224643.452273-8-kim.phillips@amd.com>
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On 1/10/23 14:46, Kim Phillips wrote:
> The AMD Zen4 core supports a new feature called Automatic IBRS.
> 
> It is a "set-and-forget" feature that means that, like
> Intel's Enhanced IBRS, h/w manages its IBRS mitigation
> resources automatically across CPL transitions.

This looks a *LOT* better than what was here before.  Sharing the eibrs
boot options looks great.  Thanks,

Acked-by: Dave Hansen <dave.hansen@linux.intel.com>