From: Dave Hansen <dave.hansen@intel.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>,
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 -v2] x86/CPU/AMD: Make sure EFER[AIBRSE] is set
Date: Mon, 13 Mar 2023 08:42:11 -0700 [thread overview]
Message-ID: <9461b569-2f76-0ec7-af8d-53ee0778b7cd@intel.com> (raw)
In-Reply-To: <20230310162253.GCZAtZXcpK2JK0cFkZ@fat_crate.local>
On 3/10/23 08:22, Borislav Petkov wrote:
> The AutoIBRS bit gets set only on the BSP as part of determining which
> mitigation to enable on AMD. Setting on the APs relies on the
> circumstance that the APs get booted through the trampoline and EFER
> - the MSR which contains that bit - gets replicated on every AP from the
> BSP.
>
> However, this can change in the future and considering the security
> implications of this bit not being set on every CPU, make sure it is set
> by verifying EFER later in the boot process and on every AP.
>
> Reported-by: Josh Poimboeuf <jpoimboe@kernel.org>
> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
> Link: https://lore.kernel.org/r/20230224185257.o3mcmloei5zqu7wa@treble
Looks sane, thanks for adding the warning:
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
next prev parent reply other threads:[~2023-03-13 15:42 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: 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
2023-01-26 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 ` [PATCH v9 7/8] x86/cpu: Support AMD Automatic IBRS 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
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 [this message]
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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