From: Josh Poimboeuf <jpoimboe@kernel.org>
To: Borislav Petkov <bp@alien8.de>
Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
Kim Phillips <kim.phillips@amd.com>,
x86@kernel.org, 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] x86/CPU/AMD: Make sure EFER[AIBRSE] is set
Date: Sat, 25 Feb 2023 09:28:32 -0800 [thread overview]
Message-ID: <20230225172832.sqdd7dejkkmjxpt6@treble> (raw)
In-Reply-To: <Y/n9XcbnCzWv2Vul@zn.tnic>
On Sat, Feb 25, 2023 at 01:21:49PM +0100, Borislav Petkov wrote:
> On Fri, Feb 24, 2023 at 05:32:02PM -0800, Josh Poimboeuf wrote:
> > > Is it intended to be set regardless of the spectre_v2 mitigation status?
> >
> > Right, it needs to check spectre_v2_enabled.
>
> Right, I realized this too this morning, while sleeping, so I made me
> a note on the nightstand to fix it... :-)
>
> > Also, this code might be a better fit in identify_secondary_cpu() with
> > the other MSR-writing bug-related code.
>
> Same path:
>
> identify_secondary_cpu->identify_cpu->this_cpu->c_init(c)->init_amd
>
> Plus, it keeps the vendor code where it belongs.
All the other "bug" code in identify_secondary_cpu() *is*
vendor-specific.
And for that matter, so is most of the code in bugs.c.
I'm thinking we should just move all this MSR-writing bug-related code
into a new cpu_init_bugs() function in bugs.c which can be called by
identify_secondary_cpu().
Then we have more "bug" code together and all the local
variables/functions like spectre_v2_in_ibrs_mode() can remain local.
--
Josh
next prev parent reply other threads:[~2023-02-25 17:28 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-24 16:33 [PATCH v9 0/8] x86/cpu, kvm: Support AMD Automatic IBRS Kim Phillips
2023-01-24 16:33 ` [PATCH v9 1/8] x86/cpu, kvm: Add support for CPUID_80000021_EAX Kim Phillips
2023-01-24 16:33 ` [PATCH v9 2/8] KVM: x86: Move open-coded cpuid leaf 0x80000021 EAX bit propagation code Kim Phillips
2023-01-24 16:33 ` [PATCH v9 3/8] x86/cpu, kvm: Add the NO_NESTED_DATA_BP feature Kim Phillips
2023-01-24 16:33 ` [PATCH v9 4/8] x86/cpu, kvm: Move X86_FEATURE_LFENCE_RDTSC to its native leaf Kim Phillips
2023-01-24 21:32 ` Sean Christopherson
2023-01-25 12:09 ` Borislav Petkov
2023-01-24 16:33 ` [PATCH v9 5/8] x86/cpu, kvm: Add the Null Selector Clears Base feature Kim Phillips
2023-01-24 16:33 ` [PATCH v9 6/8] x86/cpu, kvm: Add the SMM_CTL MSR not present feature Kim Phillips
2023-01-24 16:33 ` [PATCH v9 7/8] x86/cpu: Support AMD Automatic IBRS Kim Phillips
2023-02-24 18:52 ` Josh Poimboeuf
2023-02-24 21:08 ` Borislav Petkov
2023-02-24 21:35 ` Josh Poimboeuf
2023-02-24 21:59 ` Borislav Petkov
2023-02-24 22:03 ` Luck, Tony
2023-02-24 22:12 ` Borislav Petkov
2023-02-24 23:30 ` pawan.kumar.gupta
2023-02-24 22:51 ` Borislav Petkov
2023-02-24 23:23 ` Borislav Petkov
2023-02-25 0:09 ` Josh Poimboeuf
2023-02-25 0:20 ` [PATCH] x86/CPU/AMD: Make sure EFER[AIBRSE] is set Borislav Petkov
2023-02-25 0:52 ` Pawan Gupta
2023-02-25 1:32 ` Josh Poimboeuf
2023-02-25 12:21 ` Borislav Petkov
2023-02-25 17:28 ` Josh Poimboeuf [this message]
2023-02-25 22:56 ` Borislav Petkov
2023-02-25 23:43 ` Josh Poimboeuf
2023-02-26 11:18 ` Borislav Petkov
2023-02-26 17:27 ` Josh Poimboeuf
2023-02-26 18:44 ` Borislav Petkov
2023-02-27 15:25 ` Dave Hansen
2023-02-27 15:40 ` Borislav Petkov
2023-02-27 16:39 ` Dave Hansen
2023-03-10 16:22 ` [PATCH -v2] " Borislav Petkov
2023-03-13 15:42 ` Dave Hansen
2023-01-24 16:33 ` [PATCH v9 8/8] KVM: x86: Propagate the AMD Automatic IBRS feature to the guest Kim Phillips
2023-01-24 21:37 ` [PATCH v9 0/8] x86/cpu, kvm: Support AMD Automatic IBRS Sean Christopherson
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