From: Gerd Hoffmann <kraxel@redhat.com>
To: Igor Mammedov <imammedo@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
aarcange@redhat.com, qemu-devel@nongnu.org,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
Eduardo Habkost <ehabkost@redhat.com>,
Laszlo Ersek <lersek@redhat.com>
Subject: Re: [Qemu-devel] [PATCH 4/5] x86: Allow physical address bits to be set
Date: Fri, 17 Jun 2016 13:20:38 +0200 [thread overview]
Message-ID: <1466162438.18921.22.camel@redhat.com> (raw)
In-Reply-To: <20160617115239.035fb544@nial.brq.redhat.com>
Hi,
> > Not sure whenever qemu adds some extra space for hotplug to the 64bit
> > hole and if so how it calculates the size then. But the guest os should
> > stick to those ranges when configuring hotplugged devices.
> currently firmware would assign 64-bit BARs after reserved-memory-end
> (not sure about ovmf though)
Ah, right, reserved-memory-end is checked too if present. Both seabios
and ovmf should do that.
> but QEMU on ACPI side will add 64-bit _CRS only
> for firmware mapped devices (i.e. no space reserved for hotplug).
Yes. Tested meanwhile, looks like this (seabios):
100000000-17fffffff : System RAM
180000000-1c1ffffff : PCI Bus 0000:00
180000000-1bfffffff : 0000:00:0f.0
1c0000000-1c07fffff : PCI Bus 0000:04
1c0000000-1c07fffff : 0000:04:00.0
1c0000000-1c07fffff : virtio-pci
1c0800000-1c0ffffff : PCI Bus 0000:03
1c0800000-1c0ffffff : 0000:03:00.0
1c0800000-1c0ffffff : virtio-pci
1c1000000-1c17fffff : PCI Bus 0000:02
1c1000000-1c17fffff : 0000:02:00.0
1c1000000-1c17fffff : virtio-pci
1c1800000-1c19fffff : PCI Bus 0000:08
1c1a00000-1c1bfffff : PCI Bus 0000:07
1c1c00000-1c1dfffff : PCI Bus 0000:06
1c1e00000-1c1ffffff : PCI Bus 0000:05
seabios assigns a 2M memory window to pci bridges (which support
hotplug) even in case no device is connected, so there is some space for
hotplug because of that.
/me should try the same with ovmf ...
cheers,
Gerd
next prev parent reply other threads:[~2016-06-17 11:20 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-16 17:12 [Qemu-devel] [PATCH 0/5] x86: Physical address limit patches Dr. David Alan Gilbert (git)
2016-06-16 17:12 ` [Qemu-devel] [PATCH 1/5] BIT_RANGE convenience macro Dr. David Alan Gilbert (git)
2016-06-16 17:23 ` Paolo Bonzini
2016-06-16 17:24 ` Dr. David Alan Gilbert
2016-06-16 18:01 ` Peter Maydell
2016-06-16 18:05 ` Paolo Bonzini
2016-06-20 14:11 ` Dr. David Alan Gilbert
2016-06-20 14:17 ` Peter Maydell
2016-06-16 17:12 ` [Qemu-devel] [PATCH 2/5] x86: Mask mtrr mask based on CPU physical address limits Dr. David Alan Gilbert (git)
2016-06-16 19:59 ` Eduardo Habkost
2016-06-17 8:23 ` Dr. David Alan Gilbert
2016-06-17 12:13 ` Paolo Bonzini
2016-06-16 17:12 ` [Qemu-devel] [PATCH 3/5] x86: fill high bits of mtrr mask Dr. David Alan Gilbert (git)
2016-06-16 20:14 ` Eduardo Habkost
2016-06-17 7:47 ` Paolo Bonzini
2016-06-17 12:46 ` Eduardo Habkost
2016-06-17 13:01 ` Paolo Bonzini
2016-06-17 13:41 ` Eduardo Habkost
2016-06-17 14:25 ` Paolo Bonzini
2016-06-17 15:27 ` Eduardo Habkost
2016-06-17 15:29 ` Paolo Bonzini
2016-06-17 15:35 ` Eduardo Habkost
2016-06-17 13:51 ` Dr. David Alan Gilbert
2016-06-17 14:19 ` Paolo Bonzini
2016-06-17 8:53 ` Dr. David Alan Gilbert
2016-06-16 17:12 ` [Qemu-devel] [PATCH 4/5] x86: Allow physical address bits to be set Dr. David Alan Gilbert (git)
2016-06-16 17:26 ` Paolo Bonzini
2016-06-16 18:09 ` Eduardo Habkost
2016-06-16 20:24 ` Eduardo Habkost
2016-06-17 8:15 ` Dr. David Alan Gilbert
2016-06-17 8:43 ` Paolo Bonzini
2016-06-17 9:17 ` Gerd Hoffmann
2016-06-17 9:52 ` Igor Mammedov
2016-06-17 11:20 ` Gerd Hoffmann [this message]
2016-06-17 16:20 ` Laszlo Ersek
2016-06-17 16:07 ` Laszlo Ersek
2016-06-19 16:13 ` Marcel Apfelbaum
2016-06-20 10:42 ` Igor Mammedov
2016-06-20 11:13 ` Marcel Apfelbaum
2016-06-17 9:37 ` Dr. David Alan Gilbert
2016-06-17 9:54 ` Paolo Bonzini
2016-06-17 13:18 ` Eduardo Habkost
2016-06-17 13:38 ` Paolo Bonzini
2016-06-17 15:19 ` Eduardo Habkost
2016-06-17 15:28 ` Paolo Bonzini
2016-06-17 15:49 ` Eduardo Habkost
2016-06-21 19:44 ` [Qemu-devel] Default for phys-addr-bits? (was Re: [PATCH 4/5] x86: Allow physical address bits to be set) Eduardo Habkost
2016-06-22 12:41 ` Paolo Bonzini
2016-06-22 14:24 ` Andrea Arcangeli
2016-06-22 14:33 ` Paolo Bonzini
2016-06-22 14:44 ` Andrea Arcangeli
2016-06-22 14:48 ` Paolo Bonzini
2016-06-22 15:02 ` Andrea Arcangeli
2016-06-22 22:44 ` Michael S. Tsirkin
2016-06-22 23:23 ` Andrea Arcangeli
2016-06-22 23:45 ` Michael S. Tsirkin
2016-06-23 8:40 ` Gerd Hoffmann
2016-06-23 16:38 ` Michael S. Tsirkin
2016-06-24 5:55 ` Gerd Hoffmann
2016-06-24 23:12 ` Michael S. Tsirkin
2016-06-29 16:42 ` Dr. David Alan Gilbert
2016-06-30 6:10 ` Gerd Hoffmann
2016-06-30 10:59 ` Dr. David Alan Gilbert
2016-06-30 16:14 ` Gerd Hoffmann
2016-06-30 17:12 ` Dr. David Alan Gilbert
2016-07-01 19:03 ` Dr. David Alan Gilbert
2016-06-22 22:40 ` Michael S. Tsirkin
2016-06-22 23:15 ` Andrea Arcangeli
2016-06-19 3:36 ` [Qemu-devel] [PATCH 4/5] x86: Allow physical address bits to be set Michael S. Tsirkin
2016-06-20 7:04 ` Paolo Bonzini
2016-06-17 14:24 ` Marcel Apfelbaum
2016-06-16 17:12 ` [Qemu-devel] [PATCH 5/5] x86: Set physical address bits based on host Dr. David Alan Gilbert (git)
2016-06-17 7:25 ` Igor Mammedov
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