From: Anthony Liguori <anthony@codemonkey.ws>
To: Avi Kivity <avi@redhat.com>
Cc: Markus Armbruster <armbru@redhat.com>,
Jan Kiszka <jan.kiszka@siemens.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
Glauber Costa <glommer@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH 28/35] kvm: x86: Introduce kvmclock device to save/restore its state
Date: Tue, 25 Jan 2011 08:30:31 -0600 [thread overview]
Message-ID: <4D3EDE87.1000005@codemonkey.ws> (raw)
In-Reply-To: <4D3EAEB9.80803@redhat.com>
On 01/25/2011 05:06 AM, Avi Kivity wrote:
> On 01/19/2011 06:57 PM, Anthony Liguori wrote:
>> On 01/19/2011 07:15 AM, Markus Armbruster wrote:
>>> So they interact with KVM (need kvm_state), and they interact with the
>>> emulated PCI bus. Could you elaborate on the fundamental difference
>>> between the two interactions that makes you choose the (hypothetical)
>>> KVM bus over the PCI bus as device parent?
>>
>> It's almost arbitrary, but I would say it's the direction that I/Os
>> flow.
>>
>
> In the case of kvm, things are somewhat misleading. I/O still flows
> through the (virtual) PCI bus, it's just short-circuited to a real device.
It doesn't. If we have a PCI bus that transforms I/O or remaps I/O via
an IOMMU, that device doesn't participate in it.
But this whole discussion is way off track.
We don't have to solve any of these problems today. Just don't remove
kvm_state and grab a global reference to it when we need to (which is
*at best* one place in the code today) and let's move on with our lives.
Regards,
Anthony Liguori
> Similarly when attaching an ioeventfd to a virtio kick register,
> things still logically from the same way as without ioeventfd; we
> simply add a fast path for the operation. But it doesn't change the
> logical view of things.
>
WARNING: multiple messages have this Message-ID (diff)
From: Anthony Liguori <anthony@codemonkey.ws>
To: Avi Kivity <avi@redhat.com>
Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
Jan Kiszka <jan.kiszka@siemens.com>,
Glauber Costa <glommer@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
Markus Armbruster <armbru@redhat.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH 28/35] kvm: x86: Introduce kvmclock device to save/restore its state
Date: Tue, 25 Jan 2011 08:30:31 -0600 [thread overview]
Message-ID: <4D3EDE87.1000005@codemonkey.ws> (raw)
In-Reply-To: <4D3EAEB9.80803@redhat.com>
On 01/25/2011 05:06 AM, Avi Kivity wrote:
> On 01/19/2011 06:57 PM, Anthony Liguori wrote:
>> On 01/19/2011 07:15 AM, Markus Armbruster wrote:
>>> So they interact with KVM (need kvm_state), and they interact with the
>>> emulated PCI bus. Could you elaborate on the fundamental difference
>>> between the two interactions that makes you choose the (hypothetical)
>>> KVM bus over the PCI bus as device parent?
>>
>> It's almost arbitrary, but I would say it's the direction that I/Os
>> flow.
>>
>
> In the case of kvm, things are somewhat misleading. I/O still flows
> through the (virtual) PCI bus, it's just short-circuited to a real device.
It doesn't. If we have a PCI bus that transforms I/O or remaps I/O via
an IOMMU, that device doesn't participate in it.
But this whole discussion is way off track.
We don't have to solve any of these problems today. Just don't remove
kvm_state and grab a global reference to it when we need to (which is
*at best* one place in the code today) and let's move on with our lives.
Regards,
Anthony Liguori
> Similarly when attaching an ioeventfd to a virtio kick register,
> things still logically from the same way as without ioeventfd; we
> simply add a fast path for the operation. But it doesn't change the
> logical view of things.
>
next prev parent reply other threads:[~2011-01-25 14:30 UTC|newest]
Thread overview: 300+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-06 17:56 [PATCH 00/35] [PULL] qemu-kvm.git uq/master queue Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 01/35] kvm: Enable user space NMI injection for kvm guest Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 02/35] kvm: convert kvm_ioctl(KVM_CHECK_EXTENSION) to kvm_check_extension() Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 03/35] Clean up cpu_inject_x86_mce() Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 04/35] Add "broadcast" option for mce command Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-09 18:51 ` Jan Kiszka
2011-01-09 18:51 ` [Qemu-devel] " Jan Kiszka
2011-01-15 16:24 ` Jan Kiszka
2011-01-15 16:24 ` [Qemu-devel] " Jan Kiszka
2011-01-06 17:56 ` [PATCH 05/35] Add function for checking mca broadcast of CPU Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 06/35] kvm: introduce kvm_mce_in_progress Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 07/35] kvm: kvm_mce_inj_* subroutines for templated error injections Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 08/35] kvm: introduce kvm_inject_x86_mce_on Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 09/35] kvm: x86: Fix DPL write back of segment registers Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 10/35] kvm: x86: Remove obsolete SS.RPL/DPL aligment Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 11/35] kvm: x86: Prevent sign extension of DR7 in guest debugging mode Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 12/35] kvm: x86: Fix a few coding style violations Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 13/35] kvm: Fix " Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 14/35] kvm: Drop return value of kvm_cpu_exec Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-08 13:09 ` Jan Kiszka
2011-01-08 13:09 ` [Qemu-devel] " Jan Kiszka
2011-01-06 17:56 ` [PATCH 15/35] kvm: Stop on all fatal exit reasons Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 16/35] kvm: Improve reporting of fatal errors Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 17/35] x86: Optionally dump code bytes on cpu_dump_state Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 18/35] kvm: x86: Align kvm_arch_put_registers code with comment Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 19/35] kvm: x86: Prepare kvm_get_mp_state for in-kernel irqchip Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 20/35] kvm: x86: Remove redundant mp_state initialization Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 21/35] kvm: x86: Fix xcr0 reset mismerge Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 22/35] kvm: x86: Refactor msr_star/hsave_pa setup and checks Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 23/35] kvm: x86: Reset paravirtual MSRs Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 24/35] Synchronize VCPU states before reset Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 25/35] kvm: x86: Drop MCE MSRs write back restrictions Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 26/35] kvm: Eliminate KVMState arguments Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 19:24 ` Anthony Liguori
2011-01-06 19:24 ` [Qemu-devel] " Anthony Liguori
2011-01-07 9:03 ` Jan Kiszka
2011-01-07 9:03 ` [Qemu-devel] " Jan Kiszka
2011-01-07 23:27 ` Anthony Liguori
2011-01-07 23:27 ` [Qemu-devel] " Anthony Liguori
2011-01-08 8:47 ` Jan Kiszka
2011-01-08 8:47 ` [Qemu-devel] " Jan Kiszka
2011-01-10 19:59 ` Anthony Liguori
2011-01-10 19:59 ` [Qemu-devel] " Anthony Liguori
2011-01-10 20:12 ` Jan Kiszka
2011-01-10 20:12 ` [Qemu-devel] " Jan Kiszka
2011-01-10 20:23 ` Anthony Liguori
2011-01-10 20:34 ` Jan Kiszka
2011-01-11 9:01 ` Avi Kivity
2011-01-11 9:01 ` Avi Kivity
2011-01-11 14:00 ` Anthony Liguori
2011-01-11 14:00 ` Anthony Liguori
2011-01-11 14:06 ` Alexander Graf
2011-01-11 14:06 ` Alexander Graf
2011-01-11 14:09 ` Anthony Liguori
2011-01-11 14:09 ` Anthony Liguori
2011-01-11 14:22 ` Avi Kivity
2011-01-11 14:22 ` Avi Kivity
2011-01-11 14:36 ` Anthony Liguori
2011-01-11 14:36 ` Anthony Liguori
2011-01-11 14:56 ` Avi Kivity
2011-01-11 14:56 ` Avi Kivity
2011-01-11 15:12 ` Anthony Liguori
2011-01-11 15:12 ` Anthony Liguori
2011-01-11 15:17 ` Alexander Graf
2011-01-11 15:17 ` Alexander Graf
2011-01-11 15:37 ` Avi Kivity
2011-01-11 15:37 ` Avi Kivity
2011-01-11 15:55 ` Anthony Liguori
2011-01-11 15:55 ` Anthony Liguori
2011-01-11 16:03 ` Avi Kivity
2011-01-11 16:03 ` Avi Kivity
2011-01-11 16:26 ` Anthony Liguori
2011-01-11 16:26 ` Anthony Liguori
2011-01-11 17:05 ` Avi Kivity
2011-01-11 17:05 ` Avi Kivity
2011-01-11 14:24 ` Alexander Graf
2011-01-11 14:24 ` Alexander Graf
2011-01-11 14:18 ` Avi Kivity
2011-01-11 14:18 ` Avi Kivity
2011-01-11 14:28 ` Anthony Liguori
2011-01-11 14:28 ` Anthony Liguori
2011-01-11 14:52 ` Avi Kivity
2011-01-11 14:52 ` Avi Kivity
2011-01-10 20:11 ` Anthony Liguori
2011-01-10 20:15 ` Jan Kiszka
2011-01-11 9:17 ` Avi Kivity
2011-01-11 9:17 ` Avi Kivity
2011-01-06 17:56 ` [PATCH 27/35] kvm: x86: Fix !CONFIG_KVM_PARA build Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 28/35] kvm: x86: Introduce kvmclock device to save/restore its state Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-10 20:31 ` Anthony Liguori
2011-01-10 20:31 ` Anthony Liguori
2011-01-10 21:06 ` Jan Kiszka
2011-01-10 21:06 ` Jan Kiszka
2011-01-10 22:21 ` Jan Kiszka
2011-01-10 22:21 ` Jan Kiszka
2011-01-10 23:02 ` Anthony Liguori
2011-01-10 23:02 ` Anthony Liguori
2011-01-11 5:54 ` Jan Kiszka
2011-01-11 5:54 ` Jan Kiszka
2011-01-11 8:00 ` Paolo Bonzini
2011-01-11 8:00 ` Paolo Bonzini
2011-01-11 8:53 ` Gerd Hoffmann
2011-01-11 8:53 ` Gerd Hoffmann
2011-01-11 17:13 ` Jan Kiszka
2011-01-11 17:13 ` Jan Kiszka
2011-01-11 9:31 ` Markus Armbruster
2011-01-11 9:31 ` Markus Armbruster
2011-01-11 13:54 ` Anthony Liguori
2011-01-11 13:54 ` Anthony Liguori
2011-01-12 10:22 ` Avi Kivity
2011-01-12 10:22 ` Avi Kivity
2011-01-12 10:31 ` Jan Kiszka
2011-01-12 10:31 ` Jan Kiszka
2011-01-18 14:28 ` Jan Kiszka
2011-01-18 14:28 ` Jan Kiszka
2011-01-18 15:04 ` Anthony Liguori
2011-01-18 15:04 ` Anthony Liguori
2011-01-18 15:43 ` Jan Kiszka
2011-01-18 15:43 ` Jan Kiszka
2011-01-18 15:48 ` Anthony Liguori
2011-01-18 15:48 ` Anthony Liguori
2011-01-18 15:54 ` Jan Kiszka
2011-01-18 15:54 ` Jan Kiszka
2011-01-18 17:02 ` Alex Williamson
2011-01-18 17:02 ` Alex Williamson
2011-01-18 17:08 ` Jan Kiszka
2011-01-18 17:08 ` Jan Kiszka
2011-01-18 17:39 ` Alex Williamson
2011-01-18 17:39 ` Alex Williamson
2011-01-18 15:50 ` Anthony Liguori
2011-01-18 15:50 ` Anthony Liguori
2011-01-18 16:01 ` Jan Kiszka
2011-01-18 16:01 ` Jan Kiszka
2011-01-18 16:04 ` Anthony Liguori
2011-01-18 16:04 ` Anthony Liguori
2011-01-18 16:17 ` Jan Kiszka
2011-01-18 16:17 ` Jan Kiszka
2011-01-18 16:37 ` Anthony Liguori
2011-01-18 16:37 ` Anthony Liguori
2011-01-18 16:56 ` Jan Kiszka
2011-01-18 16:56 ` Jan Kiszka
2011-01-18 17:09 ` Anthony Liguori
2011-01-18 17:09 ` Anthony Liguori
2011-01-18 17:20 ` Jan Kiszka
2011-01-18 17:20 ` Jan Kiszka
2011-01-18 17:31 ` Anthony Liguori
2011-01-18 17:31 ` Anthony Liguori
2011-01-18 17:45 ` Jan Kiszka
2011-01-18 17:45 ` Jan Kiszka
2011-01-19 9:48 ` Gerd Hoffmann
2011-01-19 9:48 ` Gerd Hoffmann
2011-01-19 13:11 ` Markus Armbruster
2011-01-19 13:11 ` Markus Armbruster
2011-01-19 16:54 ` Anthony Liguori
2011-01-19 16:54 ` Anthony Liguori
2011-01-19 17:19 ` Daniel P. Berrange
2011-01-19 17:19 ` Daniel P. Berrange
2011-01-19 17:43 ` Anthony Liguori
2011-01-19 17:43 ` Anthony Liguori
2011-01-20 8:44 ` Gerd Hoffmann
2011-01-20 8:44 ` Gerd Hoffmann
2011-01-20 10:33 ` Daniel P. Berrange
2011-01-20 10:33 ` Daniel P. Berrange
2011-01-20 19:42 ` Anthony Liguori
2011-01-20 19:42 ` Anthony Liguori
2011-01-20 19:39 ` Anthony Liguori
2011-01-20 19:39 ` Anthony Liguori
2011-01-21 8:35 ` Gerd Hoffmann
2011-01-21 8:35 ` Gerd Hoffmann
2011-01-21 10:03 ` Markus Armbruster
2011-01-21 10:03 ` Markus Armbruster
2011-01-19 16:53 ` Anthony Liguori
2011-01-19 16:53 ` Anthony Liguori
2011-01-19 17:01 ` Daniel P. Berrange
2011-01-19 17:01 ` Daniel P. Berrange
2011-01-19 17:51 ` Anthony Liguori
2011-01-19 17:51 ` Anthony Liguori
2011-01-19 18:52 ` Daniel P. Berrange
2011-01-19 18:52 ` Daniel P. Berrange
2011-01-19 18:58 ` Anthony Liguori
2011-01-19 18:58 ` Anthony Liguori
2011-01-19 17:35 ` Daniel P. Berrange
2011-01-19 17:35 ` Daniel P. Berrange
2011-01-19 17:42 ` Anthony Liguori
2011-01-19 17:42 ` Anthony Liguori
2011-01-19 18:53 ` Daniel P. Berrange
2011-01-19 18:53 ` Daniel P. Berrange
2011-01-19 13:09 ` Markus Armbruster
2011-01-19 13:09 ` Markus Armbruster
2011-01-24 8:45 ` Gleb Natapov
2011-01-24 8:45 ` Gleb Natapov
2011-01-19 13:15 ` Markus Armbruster
2011-01-19 13:15 ` Markus Armbruster
2011-01-19 16:57 ` Anthony Liguori
2011-01-19 16:57 ` [Qemu-devel] " Anthony Liguori
2011-01-19 17:25 ` Jan Kiszka
2011-01-19 17:25 ` Jan Kiszka
2011-01-19 19:32 ` Blue Swirl
2011-01-19 19:32 ` Blue Swirl
2011-01-20 9:33 ` Jan Kiszka
2011-01-20 9:33 ` Jan Kiszka
2011-01-20 19:27 ` Blue Swirl
2011-01-20 19:27 ` Blue Swirl
2011-01-20 21:22 ` Jan Kiszka
2011-01-20 21:22 ` Jan Kiszka
2011-01-20 21:40 ` Blue Swirl
2011-01-20 21:40 ` Blue Swirl
2011-01-20 21:53 ` Jan Kiszka
2011-01-20 21:53 ` Jan Kiszka
2011-01-25 11:10 ` Avi Kivity
2011-01-25 11:10 ` Avi Kivity
2011-01-21 8:46 ` Gerd Hoffmann
2011-01-21 8:46 ` Gerd Hoffmann
2011-01-21 10:05 ` Markus Armbruster
2011-01-21 10:05 ` Markus Armbruster
2011-01-21 16:37 ` Blue Swirl
2011-01-21 16:37 ` Blue Swirl
2011-01-21 17:21 ` Jan Kiszka
2011-01-21 17:21 ` Jan Kiszka
2011-01-21 18:04 ` Blue Swirl
2011-01-21 18:04 ` Blue Swirl
2011-01-21 18:17 ` Jan Kiszka
2011-01-21 18:17 ` Jan Kiszka
2011-01-21 18:49 ` Blue Swirl
2011-01-21 18:49 ` Blue Swirl
2011-01-24 14:08 ` Jan Kiszka
2011-01-24 14:08 ` Jan Kiszka
2011-01-24 21:35 ` Blue Swirl
2011-01-24 21:35 ` Blue Swirl
2011-01-24 21:57 ` Jan Kiszka
2011-01-24 21:57 ` Jan Kiszka
2011-01-20 19:37 ` Anthony Liguori
2011-01-20 19:37 ` Anthony Liguori
2011-01-20 20:02 ` Blue Swirl
2011-01-20 20:02 ` Blue Swirl
2011-01-20 21:42 ` Jan Kiszka
2011-01-20 21:42 ` Jan Kiszka
2011-01-20 21:27 ` Jan Kiszka
2011-01-20 21:27 ` Jan Kiszka
2011-01-25 11:06 ` Avi Kivity
2011-01-25 11:06 ` Avi Kivity
2011-01-25 14:30 ` Anthony Liguori [this message]
2011-01-25 14:30 ` Anthony Liguori
2011-01-25 10:34 ` Avi Kivity
2011-01-25 10:34 ` Avi Kivity
2011-01-25 10:27 ` Avi Kivity
2011-01-25 10:27 ` Avi Kivity
2011-01-25 13:58 ` Anthony Liguori
2011-01-25 13:58 ` Anthony Liguori
2011-01-12 12:04 ` Markus Armbruster
2011-01-12 12:04 ` Markus Armbruster
2011-01-10 23:04 ` Anthony Liguori
2011-01-10 23:04 ` Anthony Liguori
2011-01-11 5:55 ` Jan Kiszka
2011-01-11 5:55 ` Jan Kiszka
2011-01-06 17:56 ` [PATCH 29/35] kvm: Drop smp_cpus argument from init functions Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 30/35] kvm: Consolidate must-have capability checks Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 31/35] kvm: x86: Rework identity map and TSS setup for larger BIOS sizes Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 32/35] kvm: Flush coalesced mmio buffer on IO window exits Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 33/35] kvm: Do not use qemu_fair_mutex Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 34/35] kvm: x86: Implicitly clear nmi_injected/pending on reset Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-06 17:56 ` [PATCH 35/35] kvm: x86: Only read/write MSR_KVM_ASYNC_PF_EN if supported Marcelo Tosatti
2011-01-06 17:56 ` [Qemu-devel] " Marcelo Tosatti
2011-01-27 14:39 ` [PATCH] kvm: x86: Fix build in absence of KVM_CAP_ASYNC_PF Jan Kiszka
2011-01-27 14:39 ` [Qemu-devel] " Jan Kiszka
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