From: David Woodhouse <dwmw2@infradead.org>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: aliguori@us.ibm.com, lersek@redhat.com, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 4/3] wakeup: only reset the CPU
Date: Tue, 05 Mar 2013 16:59:51 +0000 [thread overview]
Message-ID: <1362502791.32301.13.camel@i7.infradead.org> (raw)
In-Reply-To: <1362499403-16514-1-git-send-email-pbonzini@redhat.com>
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On Tue, 2013-03-05 at 17:03 +0100, Paolo Bonzini wrote:
> Resuming from suspend-to-RAM should not reset all devices. Only the
> CPU should get a reset signal.
Hm... on reflection, I don't actually know if this is true.
Perhaps we *should* reset all devices. After all, in a real machine
they'll all have been turned off and the RAM will have been in
self-refresh. Surely they have to be reset?
So maybe we should *let* the i440FX PAM registers get reset to point to
ROM. And fix the firmware to *cope* with that, check to see if the
shadow RAM already holds an image of a started-up firmware with the
correct checksum, and jump back to it.
That is: perhaps it's a *SeaBIOS* bug that suspend/resume doesn't work
if the PAM configuration is reset?
--
dwmw2
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next prev parent reply other threads:[~2013-03-05 17:00 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-05 15:04 [Qemu-devel] [PATCH 0/3] Implement x86 soft reset Paolo Bonzini
2013-03-05 15:04 ` [Qemu-devel] [PATCH 1/3] cpu: make CPU_INTERRUPT_RESET available on all targets Paolo Bonzini
2013-03-05 15:38 ` Anthony Liguori
2013-03-05 16:10 ` Andreas Färber
2013-03-05 16:17 ` Paolo Bonzini
2013-03-05 18:00 ` Laszlo Ersek
2013-03-05 15:04 ` [Qemu-devel] [PATCH 2/3] pc: port 92 reset requires a low->high transition Paolo Bonzini
2013-03-05 17:20 ` Anthony Liguori
2013-03-05 18:05 ` Laszlo Ersek
2013-03-05 15:04 ` [Qemu-devel] [PATCH 3/3] hw: correctly implement soft reset Paolo Bonzini
2013-03-05 17:18 ` Anthony Liguori
2013-03-05 17:22 ` David Woodhouse
2013-03-05 17:43 ` Paolo Bonzini
2013-03-05 18:32 ` Laszlo Ersek
2013-03-05 15:51 ` [Qemu-devel] [PATCH 0/3] Implement x86 " David Woodhouse
2013-03-05 16:00 ` Paolo Bonzini
2013-03-05 16:13 ` Andreas Färber
2013-03-05 16:03 ` [Qemu-devel] [PATCH 4/3] wakeup: only reset the CPU Paolo Bonzini
2013-03-05 16:59 ` David Woodhouse [this message]
2013-03-05 17:10 ` Paolo Bonzini
2013-03-05 17:26 ` Peter Stuge
2013-03-05 17:42 ` Paolo Bonzini
2013-03-05 19:12 ` Laszlo Ersek
2013-03-05 19:25 ` Paolo Bonzini
2013-03-05 19:51 ` Laszlo Ersek
2013-03-06 1:45 ` Kevin O'Connor
2013-03-06 8:32 ` David Woodhouse
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