Re: [Bug 1693649] Re: x86 pause misbehaves with -cpu haswell

[Paul Goyette]

Seems ok now.

On Fri, 22 May 2020, Thomas Huth wrote:

> Can you still reproduce this issue with the latest version of QEMU
> (currently 5.0)?
>
> ** Changed in: qemu
>       Status: New => Incomplete
>
> -- 
> You received this bug notification because you are subscribed to the bug
> report.
> 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:
> https://bugs.launchpad.net/qemu/+bug/1693649/+subscriptions
>
> !DSPAM:5ec7625658281532840571!
>
>

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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:
https://bugs.launchpad.net/qemu/+bug/1693649/+subscriptions