From: Paolo Bonzini <pbonzini@redhat.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: xen-devel@lists.xensource.com, Gerd Hoffmann <kraxel@redhat.com>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH v3 2/6] suspend: switch acpi s3 to new infrastructure.
Date: Thu, 09 Feb 2012 13:47:30 +0100 [thread overview]
Message-ID: <4F33C062.5080302@redhat.com> (raw)
In-Reply-To: <20120209123157.GJ18866@redhat.com>
On 02/09/2012 01:31 PM, Gleb Natapov wrote:
> Real HW may have other ways to notify BIOS that system was S3 suspended
> (special chipset register for instance). I think we can write DSDT magic
> to write RTC for us, but I prefer to do it from inside QEMU.
Heh, I would prefer DSDT magic, but I wouldn't want to write it. ;)
> > RTC memory is nvram, what happens if I remove the mains plug while
> > the system is in S3?
>
> RTC is battery backed, but what do you expect will happen to main memory
> where all your data resides during S3 in this case anyway?
Ah, I confused the ACPI resume vector with the BIOS vector at 0040:0067.
No ACPI tables -> no resume vector, and S3 resume will fail.
Paolo
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: xen-devel@lists.xensource.com, Gerd Hoffmann <kraxel@redhat.com>,
qemu-devel@nongnu.org
Subject: Re: [PATCH v3 2/6] suspend: switch acpi s3 to new infrastructure.
Date: Thu, 09 Feb 2012 13:47:30 +0100 [thread overview]
Message-ID: <4F33C062.5080302@redhat.com> (raw)
In-Reply-To: <20120209123157.GJ18866@redhat.com>
On 02/09/2012 01:31 PM, Gleb Natapov wrote:
> Real HW may have other ways to notify BIOS that system was S3 suspended
> (special chipset register for instance). I think we can write DSDT magic
> to write RTC for us, but I prefer to do it from inside QEMU.
Heh, I would prefer DSDT magic, but I wouldn't want to write it. ;)
> > RTC memory is nvram, what happens if I remove the mains plug while
> > the system is in S3?
>
> RTC is battery backed, but what do you expect will happen to main memory
> where all your data resides during S3 in this case anyway?
Ah, I confused the ACPI resume vector with the BIOS vector at 0040:0067.
No ACPI tables -> no resume vector, and S3 resume will fail.
Paolo
next prev parent reply other threads:[~2012-02-09 12:47 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-08 11:00 [Qemu-devel] [PATCH v3 0/6] initial suspend support Gerd Hoffmann
2012-02-08 11:00 ` Gerd Hoffmann
2012-02-08 11:00 ` [Qemu-devel] [PATCH v3 1/6] suspend: add infrastructure Gerd Hoffmann
2012-02-08 11:00 ` Gerd Hoffmann
2012-02-09 8:48 ` [Qemu-devel] " Gleb Natapov
2012-02-09 8:48 ` Gleb Natapov
2012-02-09 10:45 ` [Qemu-devel] " Gerd Hoffmann
2012-02-09 10:45 ` Gerd Hoffmann
2012-02-09 11:19 ` [Qemu-devel] " Gleb Natapov
2012-02-09 11:19 ` Gleb Natapov
2012-02-09 12:02 ` [Qemu-devel] " Gerd Hoffmann
2012-02-09 12:02 ` Gerd Hoffmann
2012-02-09 12:37 ` [Qemu-devel] " Gleb Natapov
2012-02-09 12:37 ` Gleb Natapov
2012-02-09 12:46 ` [Qemu-devel] " Gerd Hoffmann
2012-02-09 12:46 ` Gerd Hoffmann
2012-02-09 13:17 ` [Qemu-devel] " Gleb Natapov
2012-02-09 13:17 ` Gleb Natapov
2012-02-09 13:29 ` [Qemu-devel] " Gerd Hoffmann
2012-02-09 13:29 ` Gerd Hoffmann
2012-02-09 16:00 ` [Qemu-devel] " Gerd Hoffmann
2012-02-09 16:00 ` Gerd Hoffmann
2012-02-09 16:05 ` [Qemu-devel] " Gleb Natapov
2012-02-09 16:05 ` Gleb Natapov
2012-02-08 11:00 ` [Qemu-devel] [PATCH v3 2/6] suspend: switch acpi s3 to new infrastructure Gerd Hoffmann
2012-02-08 11:00 ` Gerd Hoffmann
2012-02-09 8:53 ` [Qemu-devel] " Gleb Natapov
2012-02-09 8:53 ` Gleb Natapov
2012-02-09 10:51 ` [Qemu-devel] " Gerd Hoffmann
2012-02-09 10:51 ` Gerd Hoffmann
2012-02-09 11:14 ` [Qemu-devel] " Gleb Natapov
2012-02-09 11:14 ` Gleb Natapov
2012-02-09 11:13 ` [Qemu-devel] [Xen-devel] " Stefano Stabellini
2012-02-09 11:13 ` Stefano Stabellini
2012-02-09 11:17 ` [Qemu-devel] " Paolo Bonzini
2012-02-09 11:17 ` Paolo Bonzini
2012-02-09 12:31 ` [Qemu-devel] " Gleb Natapov
2012-02-09 12:31 ` Gleb Natapov
2012-02-09 12:47 ` Paolo Bonzini [this message]
2012-02-09 12:47 ` Paolo Bonzini
2012-02-09 12:53 ` [Qemu-devel] " Gleb Natapov
2012-02-09 12:53 ` Gleb Natapov
2012-02-08 11:00 ` [Qemu-devel] [PATCH v3 3/6] suspend: add system_wakeup monitor command Gerd Hoffmann
2012-02-08 11:00 ` Gerd Hoffmann
2012-02-09 8:54 ` [Qemu-devel] " Gleb Natapov
2012-02-09 8:54 ` Gleb Natapov
2012-02-08 11:00 ` [Qemu-devel] [PATCH v3 4/6] suspend: make ps/2 devices wakeup the guest Gerd Hoffmann
2012-02-08 11:00 ` Gerd Hoffmann
2012-02-08 11:00 ` [Qemu-devel] [PATCH v3 5/6] suspend: make serial ports " Gerd Hoffmann
2012-02-08 11:00 ` Gerd Hoffmann
2012-02-08 11:00 ` [Qemu-devel] [PATCH v3 6/6] suspend: make rtc alarm " Gerd Hoffmann
2012-02-08 11:00 ` Gerd Hoffmann
2012-02-09 8:56 ` [Qemu-devel] " Gleb Natapov
2012-02-09 8:56 ` Gleb Natapov
2012-02-09 12:00 ` [Qemu-devel] " Gerd Hoffmann
2012-02-09 12:00 ` Gerd Hoffmann
2012-02-09 12:24 ` [Qemu-devel] " Gleb Natapov
2012-02-09 12:24 ` Gleb Natapov
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