linux-kernel - Re: Linux 6.11-rc1

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Message-ID: <20240731122002.GE33588@noisy.programming.kicks-ass.net>
Date: Wed, 31 Jul 2024 14:20:02 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Guenter Roeck <linux@...ck-us.net>
Cc: Jens Axboe <axboe@...nel.dk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Peter Anvin <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: Linux 6.11-rc1

On Tue, Jul 30, 2024 at 01:24:34PM -0700, Guenter Roeck wrote:
> An interesting bit of information: The problem is seen with many,
> but not all CPUs. For example, I don't see it with athlon, n270, Dhyana,
> or EPYC. qemu32 is affected, but qemu64 is fine. But on the other side
> both kvm32 and kvm64 are affected.

pti=off makes it go away, could be those CPU models don't have meltdown
and as such don't enable PTI.