From: Dave Hansen <dave.hansen@intel.com>
To: Kim Phillips <kim.phillips@amd.com>, x86@kernel.org
Cc: Babu Moger <Babu.Moger@amd.com>, Borislav Petkov <bp@alien8.de>,
Borislav Petkov <bp@suse.de>,
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
Subject: Re: [PATCH v4 6/7] x86/cpu: Support AMD Automatic IBRS
Date: Fri, 2 Dec 2022 09:40:29 -0800 [thread overview]
Message-ID: <7a078451-172c-40f3-c2c7-4472c5006532@intel.com> (raw)
In-Reply-To: <20221201015003.295769-7-kim.phillips@amd.com>
On 11/30/22 17:50, Kim Phillips wrote:
> @@ -1240,8 +1240,11 @@ static const struct {
> { "retpoline,lfence", SPECTRE_V2_CMD_RETPOLINE_LFENCE, false },
> { "retpoline,generic", SPECTRE_V2_CMD_RETPOLINE_GENERIC, false },
> { "eibrs", SPECTRE_V2_CMD_EIBRS, false },
> + { "autoibrs", SPECTRE_V2_CMD_EIBRS, false },
> { "eibrs,lfence", SPECTRE_V2_CMD_EIBRS_LFENCE, false },
> + { "autoibrs,lfence", SPECTRE_V2_CMD_EIBRS_LFENCE, false },
> { "eibrs,retpoline", SPECTRE_V2_CMD_EIBRS_RETPOLINE, false },
> + { "autoibrs,retpoline", SPECTRE_V2_CMD_EIBRS_RETPOLINE, false },
> { "auto", SPECTRE_V2_CMD_AUTO, false },
> { "ibrs", SPECTRE_V2_CMD_IBRS, false },
I don't think we should expose "autoibrs" to end users like this.
"eibrs" means always-on IBRS. Intel did it first, so gets to name it.
Those are the rules, and it's why we call it "x86_64" and not whatever
Intel's silly name for it was.
Also, expanding the strings:
> + [SPECTRE_V2_EIBRS_RETPOLINE] = "Mitigation: Enhanced / Automatic IBRS + Retpolines",
is fine, but adding new user-visible options that we have to document is
not.
next prev parent reply other threads:[~2022-12-02 17:40 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-01 1:49 [PATCH v4 0/7] x86/cpu, kvm: Support AMD Automatic IBRS Kim Phillips
2022-12-01 1:49 ` [PATCH v4 1/7] x86/cpu: Define a scattered No Nested Data Breakpoints feature bit Kim Phillips
2022-12-05 10:23 ` Borislav Petkov
2022-12-05 17:32 ` Kim Phillips
2022-12-05 20:20 ` Borislav Petkov
2022-12-05 22:05 ` Kim Phillips
2022-12-01 1:49 ` [PATCH v4 2/7] x86/cpu: Define a scattered Null Selector Clears Base " Kim Phillips
2022-12-01 1:49 ` [PATCH v4 3/7] x86/cpu: Make X86_FEATURE_LFENCE_RDTSC a scattered " Kim Phillips
2022-12-01 1:50 ` [PATCH v4 4/7] x86/cpu, kvm: Move CPUID 0x80000021 EAX feature bits propagation to kvm_set_cpu_caps() Kim Phillips
2022-12-01 1:50 ` [PATCH v4 5/7] x86/cpu: Define a scattered AMD Automatic IBRS feature bit Kim Phillips
2022-12-01 1:50 ` [PATCH v4 6/7] x86/cpu: Support AMD Automatic IBRS Kim Phillips
2022-12-02 16:31 ` Pawan Gupta
2022-12-02 17:40 ` Dave Hansen [this message]
2022-12-01 1:50 ` [PATCH v4 7/7] x86/cpu, kvm: Propagate the AMD Automatic IBRS feature to the guest Kim Phillips
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