From: Gleb Natapov <gleb@redhat.com>
To: Vasilis Liaskovitis <vliaskov@gmail.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>,
seabios@seabios.org, armbru@redhat.com, kvm@vger.kernel.org
Subject: Re: [PATCH] cpu hotplug issue
Date: Thu, 4 Aug 2011 11:01:56 +0300 [thread overview]
Message-ID: <20110804080156.GE4404@redhat.com> (raw)
In-Reply-To: <20110803162507.GA21463@dhcp-192-168-178-175.profitbricks.localdomain>
On Wed, Aug 03, 2011 at 06:25:07PM +0200, Vasilis Liaskovitis wrote:
> On Wed, Aug 03, 2011 at 12:42:11PM +0200, Jan Kiszka wrote:
> > >> Why can't Seabios read to true number online CPUs from the PIIX4 device?
> > >> The information is there already, no need for addition PV here.
> > >>
> > > Where is it in PIIX4 device?
> >
> > PROC registers (or however they are called).
>
> In qemu-kvm, the cpus_sts bitmap array in PIIX4PMState/ACPIGPE has the true
> number of online CPUS. This is accessed from the DSDT hotplug method in Seabios
> as "OperationRegion SystemIO" with address 0xaf00. Is this i/o address in the
> piix4 spec? How can it be accessed from the rest of SeaBIOS? It seems to reside
> in ACPI_PM space.
>
0xaf00 is not part of PIIX4. PIIX4 supports nor cpu host plug
neither pci hot plug. I haven't found any PROC register in PIIX4 spec
so far.
--
Gleb.
next prev parent reply other threads:[~2011-08-04 8:01 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-19 17:40 cpu hotplug issue Vasilis Liaskovitis
2011-07-20 8:35 ` Gleb Natapov
2011-07-21 11:06 ` [PATCH] " Vasilis Liaskovitis
2011-07-21 11:33 ` Gleb Natapov
2011-07-21 11:42 ` Jan Kiszka
2011-07-21 11:51 ` Gleb Natapov
2011-07-21 11:55 ` Jan Kiszka
2011-07-21 12:00 ` Gleb Natapov
2011-07-21 12:18 ` Avi Kivity
2011-07-21 12:22 ` Gleb Natapov
2011-07-21 12:39 ` Jan Kiszka
2011-07-21 13:27 ` Lucas Meneghel Rodrigues
2011-07-21 12:45 ` Gleb Natapov
2011-07-22 10:56 ` Jan Kiszka
2011-07-24 11:56 ` Gleb Natapov
2011-07-24 16:11 ` Jan Kiszka
2011-07-25 13:18 ` Jan Kiszka
2011-07-25 13:21 ` Gleb Natapov
2011-07-25 13:26 ` Jan Kiszka
2011-07-27 16:35 ` Vasilis Liaskovitis
2011-07-28 16:52 ` Jan Kiszka
2011-08-02 9:46 ` Vasilis Liaskovitis
2011-08-02 10:24 ` Jan Kiszka
2011-08-02 13:41 ` Vasilis Liaskovitis
2011-08-03 10:07 ` Vasilis Liaskovitis
2011-08-03 10:37 ` Jan Kiszka
2011-08-03 10:38 ` Gleb Natapov
2011-08-03 10:42 ` Jan Kiszka
2011-08-03 16:25 ` Vasilis Liaskovitis
2011-08-04 8:01 ` Gleb Natapov [this message]
2011-08-04 8:40 ` Jan Kiszka
2011-07-21 13:08 ` Vasilis Liaskovitis
2011-07-21 13:11 ` Gleb Natapov
2011-07-21 13:12 ` Vasilis Liaskovitis
2011-07-21 13:13 ` Gleb Natapov
2011-07-21 13:15 ` Avi Kivity
2011-07-21 13:15 ` Avi Kivity
2011-07-21 11:36 ` Jan Kiszka
2011-07-21 12:22 ` Jan Kiszka
2011-07-21 12:25 ` Gleb Natapov
2011-07-21 12:35 ` Jan Kiszka
2011-07-21 12:40 ` Gleb Natapov
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