From: Arnd Bergmann <arnd@arndb.de>
To: linaro-acpi@lists.linaro.org
Cc: Mark Rutland <mark.rutland@arm.com>,
Peter Maydell <peter.maydell@linaro.org>,
"Ian.Campbell@citrix.com" <Ian.Campbell@citrix.com>,
Claudio Fontana <claudio.fontana@huawei.com>,
QEMU Developers <qemu-devel@nongnu.org>,
"stefano.stabellini@citrix.com" <stefano.stabellini@citrix.com>,
Paolo Bonzini <pbonzini@redhat.com>,
"tech@virtualopensystems.com" <tech@virtualopensystems.com>,
Parth Dixit <parth.dixit@linaro.org>,
Christoffer Dall <christoffer.dall@linaro.org>
Subject: Re: [Qemu-devel] [Linaro-acpi] [RFC PATCH 0/7] hw/arm/virt: Dynamic ACPI v5.1 table generation
Date: Wed, 12 Nov 2014 16:32:10 +0100 [thread overview]
Message-ID: <2085435.cOIMo5l3OF@wuerfel> (raw)
In-Reply-To: <5463763A.7080707@huawei.com>
On Wednesday 12 November 2014 16:01:14 Claudio Fontana wrote:
>
> Would the last step you mention allow for guests to start with an already existing PCI interrupt map
> and the BAR registers preprogrammed to point to somewhere sane?
>
> I ask because on OSv at the moment, the situation is that for x86 we don't need to reprogram anything on PCI,
> as everything is already nicely set up by the time the guest starts, and thus the BAR addresses can be read directly.
> On ARM we have to reprogram the BARs manually for all devices.
>
> Couldn't we give an easier time to each OS guest by having everything
> nicely set up on AArch64 as well?
Definitely, I think having the OS manually program the BARs only makes sense
in an environment where you don't have a full-featured boot loader or you
don't trust it. In servers and virtual machines, the PCI bus should always come
fully set up. This also implies that the OS should not have to deal with
registers for setting up the translation between PCI and system address
ranges.
Arnd
next prev parent reply other threads:[~2014-11-12 15:32 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-30 17:43 [Qemu-devel] [RFC PATCH 0/7] hw/arm/virt: Dynamic ACPI v5.1 table generation Alexander Spyridakis
2014-10-30 17:43 ` [Qemu-devel] [RFC PATCH 1/7] hw/i386: Move ACPI header definitions in an arch-independent location Alexander Spyridakis
2014-10-30 17:44 ` [Qemu-devel] [RFC PATCH 2/7] hw/arm/virt-acpi: Basic skeleton for dynamic generation of ACPI tables Alexander Spyridakis
2014-10-30 17:46 ` Peter Maydell
2014-10-30 17:52 ` [Qemu-devel] [RFC PATCH 0/7] hw/arm/virt: Dynamic ACPI v5.1 table generation Peter Maydell
2014-10-30 18:02 ` [Qemu-devel] [Linaro-acpi] " Mark Rutland
2014-11-05 9:58 ` Claudio Fontana
2014-11-06 12:44 ` Peter Maydell
2014-11-06 12:57 ` Igor Mammedov
2014-11-06 13:33 ` Alexander Spyridakis
2014-11-06 13:52 ` Peter Maydell
2014-11-11 15:29 ` Mark Rutland
2014-11-11 16:31 ` Christoffer Dall
2014-11-11 16:48 ` Mark Rutland
2014-11-11 21:33 ` Christoffer Dall
2014-11-12 10:38 ` Mark Rutland
2014-11-12 10:44 ` Christoffer Dall
2014-11-12 10:55 ` Julien Grall
2014-11-12 11:07 ` Mark Rutland
2014-11-12 11:38 ` Graeme Gregory
2014-11-12 11:52 ` Paolo Bonzini
2014-11-12 12:04 ` Mark Rutland
2014-11-12 12:12 ` Paolo Bonzini
2014-11-12 13:27 ` Peter Maydell
2014-11-12 13:32 ` Paolo Bonzini
2014-11-12 15:01 ` Claudio Fontana
2014-11-12 15:32 ` Arnd Bergmann [this message]
2014-11-12 15:39 ` Peter Maydell
2014-11-12 15:52 ` Paolo Bonzini
2014-11-12 15:57 ` Arnd Bergmann
2014-11-12 16:04 ` Paolo Bonzini
2014-11-12 16:13 ` Arnd Bergmann
2014-11-12 16:25 ` Paolo Bonzini
2014-11-12 17:33 ` Peter Maydell
2014-11-13 8:32 ` Gerd Hoffmann
2014-11-13 8:14 ` Gerd Hoffmann
2014-11-13 8:10 ` Gerd Hoffmann
2014-11-13 18:16 ` Al Stone
2014-11-13 19:22 ` Paolo Bonzini
2014-11-14 7:54 ` Gerd Hoffmann
2014-11-12 9:08 ` Claudio Fontana
2014-11-12 10:56 ` Mark Rutland
2014-11-12 11:15 ` Arnd Bergmann
2014-11-12 11:34 ` Christoffer Dall
2014-11-12 11:48 ` Paolo Bonzini
2014-11-12 12:18 ` Mark Rutland
2014-11-12 12:27 ` Paolo Bonzini
2014-11-12 12:40 ` Christoffer Dall
2014-11-12 13:08 ` Arnd Bergmann
2014-11-12 13:27 ` Paolo Bonzini
2014-11-12 13:41 ` Mark Rutland
2014-11-12 13:59 ` Paolo Bonzini
2014-11-12 14:10 ` Mark Rutland
2014-11-12 14:46 ` Paolo Bonzini
2014-11-12 13:03 ` Arnd Bergmann
2014-11-12 13:35 ` Christoffer Dall
2014-11-12 11:55 ` Mark Rutland
2014-11-12 18:10 ` Peter Maydell
2014-11-13 9:57 ` Claudio Fontana
2014-11-17 17:52 ` Peter Maydell
2014-11-06 6:53 ` Hanjun Guo
2014-11-06 13:30 ` Mark Rutland
2014-11-06 13:33 ` Arnd Bergmann
2014-11-06 15:57 ` Paolo Bonzini
2014-11-06 16:18 ` Igor Mammedov
2014-11-06 16:27 ` Paolo Bonzini
2014-11-07 8:31 ` Hanjun Guo
2015-03-09 12:12 ` Leif Lindholm
2015-03-09 12:28 ` Peter Maydell
2015-03-09 12:47 ` Shannon Zhao
2015-03-09 14:50 ` Leif Lindholm
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