From: Jiri Slaby <jirislaby@kernel.org>
To: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>, stable@vger.kernel.org
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
Alyssa Milburn <alyssa.milburn@intel.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 6.1.y 1/6] x86/bugs: Add asm helpers for executing VERW
Date: Tue, 27 Feb 2024 09:19:13 +0100 [thread overview]
Message-ID: <5a289118-f6d2-4471-b833-1565fd51cbdd@kernel.org> (raw)
In-Reply-To: <20240226-delay-verw-backport-6-1-y-v1-1-b3a2c5b9b0cb@linux.intel.com>
On 27. 02. 24, 9:00, Pawan Gupta wrote:
> commit baf8361e54550a48a7087b603313ad013cc13386 upstream.
...
> --- a/arch/x86/include/asm/nospec-branch.h
> +++ b/arch/x86/include/asm/nospec-branch.h
> @@ -194,6 +194,17 @@
> #endif
> .endm
>
> +/*
> + * Macro to execute VERW instruction that mitigate transient data sampling
> + * attacks such as MDS. On affected systems a microcode update overloaded VERW
> + * instruction to also clear the CPU buffers. VERW clobbers CFLAGS.ZF.
> + *
> + * Note: Only the memory operand variant of VERW clears the CPU buffers.
> + */
> +.macro CLEAR_CPU_BUFFERS
> + ALTERNATIVE "", __stringify(verw mds_verw_sel), X86_FEATURE_CLEAR_CPU_BUF
The same here. Except 6.1 (I didn't check stable-6.1) does not have:
commit 270a69c4485d7d07516d058bcc0473c90ee22185
Author: Peter Zijlstra <peterz@infradead.org>
Date: Wed Feb 8 18:10:52 2023 +0100
x86/alternative: Support relocations in alternatives
yet. You likely need to backport that too.
regards,
--
js
suse labs
next prev parent reply other threads:[~2024-02-27 8:19 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-27 8:00 [PATCH 6.1.y 0/6] Delay VERW - 6.1.y backport Pawan Gupta
2024-02-27 8:00 ` [PATCH 6.1.y 1/6] x86/bugs: Add asm helpers for executing VERW Pawan Gupta
2024-02-27 8:19 ` Jiri Slaby [this message]
2024-02-27 8:40 ` Pawan Gupta
2024-02-27 8:00 ` [PATCH 6.1.y 2/6] x86/entry_64: Add VERW just before userspace transition Pawan Gupta
2024-02-27 8:00 ` [PATCH 6.1.y 3/6] x86/entry_32: " Pawan Gupta
2024-02-27 8:00 ` [PATCH 6.1.y 4/6] x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key Pawan Gupta
2024-02-27 8:00 ` [PATCH 6.1.y 5/6] KVM/VMX: Use BT+JNC, i.e. EFLAGS.CF to select VMRESUME vs. VMLAUNCH Pawan Gupta
2024-02-27 8:00 ` [PATCH 6.1.y 6/6] KVM/VMX: Move VERW closer to VMentry for MDS mitigation Pawan Gupta
2024-02-27 8:21 ` [PATCH 6.1.y 0/6] Delay VERW - 6.1.y backport Jiri Slaby
2024-02-27 8:56 ` Pawan Gupta
2024-02-27 9:09 ` Greg KH
2024-02-29 9:53 ` Pawan Gupta
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