From: Gerd Hoffmann <kraxel@redhat.com>
To: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Marcel Apfelbaum <marcel@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>,
qemu-devel@nongnu.org, Eduardo Habkost <ehabkost@redhat.com>
Subject: Re: [Qemu-devel] Default for phys-addr-bits? (was Re: [PATCH 4/5] x86: Allow physical address bits to be set)
Date: Thu, 30 Jun 2016 08:10:46 +0200 [thread overview]
Message-ID: <1467267046.15123.94.camel@redhat.com> (raw)
In-Reply-To: <20160629164252.GD10488@work-vm>
Hi,
> Something somewhere in qemu/ kernel/ firmware is already reading the number
> of physical bits to determine PCI mapping; if I do:
>
> ./x86_64-softmmu/qemu-system-x86_64 -m 4096,slots=16,maxmem=128T
No, it's not the physbits. You add some memory hotplug slots here.
Qemu will ask seabios to reserve address space for those, which seabios
promptly does and maps 64bit pci bars above the reserved address space.
> -vga none -device qxl-vga,bus=pcie.0,ram_size_mb=2048,vram64_size_mb=2048 -vnc 0.0.0.0:0 /home/vms/7.2a.qcow2 -chardev stdio,mux=on,id=mon -mon chardev=mon,mode=readline -cpu host,phys-bits=48
>
> it will happily map the qxl VRAM right up high, but if I lower
> the phys-bits down to 46 it won't.
I suspect the linux kernel remaps the bar because the seabios mapping is
unreachable. Check dmesg.
cheers,
Gerd
next prev parent reply other threads:[~2016-06-30 6:10 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
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 [this message]
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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