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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
To: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
	pbonzini@redhat.com, ebiggers@kernel.org, x86@kernel.org,
	linux-kernel@vger.kernel.org, qemu-devel@nongnu.org,
	ardb@kernel.org, kraxel@redhat.com, philmd@linaro.org
Subject: Re: [PATCH qemu] x86: don't let decompressed kernel image clobber setup_data
Date: Sat, 31 Dec 2022 14:42:26 +0100	[thread overview]
Message-ID: <Y7A8QiYgoYU3QdLm@zx2c4.com> (raw)
In-Reply-To: <Y7A6sTOSudSxSWLB@zn.tnic>

On Sat, Dec 31, 2022 at 02:35:45PM +0100, Borislav Petkov wrote:
> On Sat, Dec 31, 2022 at 01:54:50PM +0100, Jason A. Donenfeld wrote:
> > Nothing special... `-kernel bzImage` should be enough to do it. Eric
> > reported it, and then I was able to repro trivially. Sure you got the
> > right version?
> 
> Yeah, qemu executables confusion here - had wrongly something older of the
> version 7.1...
> 
> Now made sure I'm actually booting with the latest qemu:
> 
> QEMU emulator version 7.2.50 (v7.2.0-333-g222059a0fccf)
> 
> With that the kernel with your config hangs early during boot and the stack
> trace is below.
> 
> Seeing how it says trapnr 14, then that looks like something you are seeing.
> 
> But lemme poke at it more.

Yes. The cause is what I've described in the commit message. There are
two proposed fixes, the v1, which has the 62 MiB limitation due to a
kernel bug, and the v3, which seems to work fine, and is simpler, and I
suspect that's the one QEMU upstream should take.

https://lore.kernel.org/lkml/20221230220725.618763-1-Jason@zx2c4.com/

  reply	other threads:[~2022-12-31 13:42 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-28 14:38 Jason A. Donenfeld
2022-12-28 16:02 ` Philippe Mathieu-Daudé
2022-12-28 16:30   ` Jason A. Donenfeld
2022-12-28 16:57     ` Jason A. Donenfeld
2022-12-28 23:58       ` H. Peter Anvin
2022-12-29  2:13         ` H. Peter Anvin
2022-12-29  2:31         ` Jason A. Donenfeld
2022-12-29  7:28           ` Philippe Mathieu-Daudé
2022-12-29  7:30           ` H. Peter Anvin
2022-12-29  7:31           ` H. Peter Anvin
2022-12-29 12:47             ` Borislav Petkov
2022-12-30 15:54               ` Jason A. Donenfeld
2022-12-30 17:01                 ` Borislav Petkov
2022-12-30 17:07                   ` Jason A. Donenfeld
2022-12-30 19:54                     ` Borislav Petkov
2022-12-30 21:58                       ` H. Peter Anvin
2022-12-30 22:10                         ` Jason A. Donenfeld
2022-12-31  1:06                           ` H. Peter Anvin
2022-12-31  1:14                             ` H. Peter Anvin
2022-12-31 12:55                             ` Jason A. Donenfeld
2022-12-31 13:40                             ` Borislav Petkov
2022-12-31 13:44                               ` Jason A. Donenfeld
2022-12-31 13:48                                 ` Borislav Petkov
2022-12-31 13:51                                   ` Jason A. Donenfeld
2022-12-31 14:24                                     ` Borislav Petkov
2022-12-31 18:22                                       ` Jason A. Donenfeld
2022-12-31 19:00                                         ` Borislav Petkov
2023-01-01  3:21                                           ` H. Peter Anvin
2023-01-01  3:31                                             ` H. Peter Anvin
2023-01-02  6:01                                               ` Borislav Petkov
2023-01-02  6:17                                                 ` Borislav Petkov
2023-01-02  9:32                                                   ` Ard Biesheuvel
2023-01-02 13:36                                                     ` Borislav Petkov
2023-01-02 15:03                                                       ` Ard Biesheuvel
2023-01-02  5:50                                             ` Borislav Petkov
2023-01-01  4:33                                         ` H. Peter Anvin
2023-01-01  4:55                                           ` Mika Penttilä
2023-01-01  5:13                                             ` H. Peter Anvin
2022-12-30 15:59             ` Jason A. Donenfeld
2022-12-30 16:21               ` Jason A. Donenfeld
2022-12-30 19:13               ` H. Peter Anvin
2022-12-31  9:48               ` Borislav Petkov
2022-12-31 12:54                 ` Jason A. Donenfeld
2022-12-31 13:35                   ` Borislav Petkov
2022-12-31 13:42                     ` Jason A. Donenfeld [this message]
2022-12-30 18:30 ` Jason A. Donenfeld

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