From: Borislav Petkov <bp@alien8.de>
To: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: 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 v9 7/8] x86/cpu: Support AMD Automatic IBRS
Date: Fri, 24 Feb 2023 23:51:17 +0100 [thread overview]
Message-ID: <Y/k/ZXUXOFiBhOiI@zn.tnic> (raw)
In-Reply-To: <Y/knUC0s+rg6ef2r@zn.tnic>
On Fri, Feb 24, 2023 at 10:08:32PM +0100, Borislav Petkov wrote:
> On Fri, Feb 24, 2023 at 10:52:57AM -0800, Josh Poimboeuf wrote:
> > Doesn't this only enable it on the boot CPU?
>
> Whoops, you might be right.
Actually, we stick that MSR - EFER - into the trampoline header and then
each AP gets it written to in arch/x86/realmode/rm/trampoline_64.S
But this is only from code staring - I'll confirm this tomorrow.
And if so, we should at least put comments in that trampoline code so
that people do not remove the MSR writes.
Or, actually, we should simply write it again because it is the init
path and not really a hot path but it should damn well make sure that
that bit gets set.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2023-02-24 22:51 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-24 16:33 [PATCH v9 0/8] x86/cpu, kvm: " Kim Phillips
2023-01-24 16:33 ` [PATCH v9 1/8] x86/cpu, kvm: Add support for CPUID_80000021_EAX Kim Phillips
2023-01-26 10:12 ` [tip: x86/cpu] " tip-bot2 for 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
2023-01-26 10:12 ` [tip: x86/cpu] KVM: x86: Move open-coded CPUID " tip-bot2 for Kim Phillips
2023-01-24 16:33 ` [PATCH v9 3/8] x86/cpu, kvm: Add the NO_NESTED_DATA_BP feature Kim Phillips
2023-01-26 10:12 ` [tip: x86/cpu] " tip-bot2 for 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
2023-01-26 10:12 ` [tip: x86/cpu] " tip-bot2 for Kim Phillips
2023-01-24 16:33 ` [PATCH v9 5/8] x86/cpu, kvm: Add the Null Selector Clears Base feature Kim Phillips
2023-01-26 10:12 ` [tip: x86/cpu] " tip-bot2 for Kim Phillips
2023-01-24 16:33 ` [PATCH v9 6/8] x86/cpu, kvm: Add the SMM_CTL MSR not present feature Kim Phillips
2023-01-26 10:12 ` [tip: x86/cpu] " tip-bot2 for Kim Phillips
2023-01-24 16:33 ` [PATCH v9 7/8] x86/cpu: Support AMD Automatic IBRS Kim Phillips
2023-01-26 10:12 ` [tip: x86/cpu] " tip-bot2 for Kim Phillips
2023-02-24 18:52 ` [PATCH v9 7/8] " 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
2023-03-10 10:23 ` [tip: x86/misc] MAINTAINERS: Add x86 hardware vulnerabilities section tip-bot2 for Josh Poimboeuf
2023-02-24 22:51 ` Borislav Petkov [this message]
2023-02-24 23:23 ` [PATCH v9 7/8] x86/cpu: Support AMD Automatic IBRS 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
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
2023-03-16 11:04 ` [tip: x86/cpu] " tip-bot2 for Borislav Petkov (AMD)
2023-01-24 16:33 ` [PATCH v9 8/8] KVM: x86: Propagate the AMD Automatic IBRS feature to the guest Kim Phillips
2023-01-26 10:12 ` [tip: x86/cpu] " tip-bot2 for Kim Phillips
2023-01-24 21:37 ` [PATCH v9 0/8] x86/cpu, kvm: Support AMD Automatic IBRS Sean Christopherson
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