From: Thomas Huth <1693649@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Bug 1693649] Re: x86 pause misbehaves with -cpu haswell
Date: Fri, 22 May 2020 05:19:19 -0000 [thread overview]
Message-ID: <159012475963.7477.6476241369082913120.malone@gac.canonical.com> (raw)
In-Reply-To: 149575946555.18286.18117412791023512529.malonedeb@chaenomeles.canonical.com
Can you still reproduce this issue with the latest version of QEMU
(currently 5.0)?
** Changed in: qemu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1693649
Title:
x86 pause misbehaves with -cpu haswell
Status in QEMU:
Incomplete
Bug description:
Using qemu-2.9.0
When booting NetBSD using '-cpu haswell -smp 4', the system fails to
initialize the additional CPUs. It appears as though the "application
processor" enters routine x86_pause() but never returns.
x86_pause() is simply two assembler instructions: 'pause; ret;'
Replacing the routine with 'nop; nop; ret;' allows the system to
proceed, of course without the benefit of the pause instruction on
spin-loops!
Additionally, booting with '-cpu phenom -smp 4' also works, although
the system does seem confused about the type of CPU being used.
To manage notifications about this bug go to:
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next prev parent reply other threads:[~2020-05-22 5:27 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-26 0:44 [Qemu-devel] [Bug 1693649] [NEW] x86 pause misbehaves with -cpu haswell Paul Goyette
2017-05-26 4:40 ` [Qemu-devel] [Bug 1693649] " Paul Goyette
2020-05-22 5:19 ` Thomas Huth [this message]
2020-05-22 12:51 ` Paul Goyette
2020-05-22 19:25 ` Thomas Huth
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