From: Eduardo Habkost <ehabkost@redhat.com>
To: Alexey G <x1917x@gmail.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
qemu-devel@nongnu.org, Paolo Bonzini <pbonzini@redhat.com>,
Marcel Apfelbaum <marcel@redhat.com>,
xen-devel@lists.xenproject.org,
Richard Henderson <rth@twiddle.net>
Subject: Re: [RFC PATCH 16/30] q35/xen: Add Xen platform device support for Q35
Date: Mon, 12 Mar 2018 18:44:02 -0300 [thread overview]
Message-ID: <20180312214402.GY3417__560.613492462103$1520891001$gmane$org@localhost.localdomain> (raw)
In-Reply-To: <20180313065637.00005cee@gmail.com>
On Tue, Mar 13, 2018 at 06:56:37AM +1000, Alexey G wrote:
> On Mon, 12 Mar 2018 16:44:06 -0300
> Eduardo Habkost <ehabkost@redhat.com> wrote:
>
> >On Tue, Mar 13, 2018 at 04:34:01AM +1000, Alexey Gerasimenko wrote:
> >> Current Xen/QEMU method to control Xen Platform device on i440 is a
> >> bit odd -- enabling/disabling Xen platform device actually modifies
> >> the QEMU emulated machine type, namely xenfv <--> pc.
> >>
> >> In order to avoid multiplying machine types, use a new way to
> >> control Xen Platform device for QEMU -- "xen-platform-dev" machine
> >> property (bool). To maintain backward compatibility with existing
> >> Xen/QEMU setups, this is only applicable to q35 machine currently.
> >> i440 emulation still uses the old method (i.e. xenfv/pc machine
> >> selection) to control Xen Platform device, this may be changed later
> >> to xen-platform-dev property as well.
> >>
> >> This way we can use a single machine type (q35) and change just
> >> xen-platform-dev value to on/off to control Xen platform device.
> >>
> >> Signed-off-by: Alexey Gerasimenko <x1917x@gmail.com>
> >> ---
> >[...]
> >> diff --git a/qemu-options.hx b/qemu-options.hx
> >> index 6585058c6c..cee0b92028 100644
> >> --- a/qemu-options.hx
> >> +++ b/qemu-options.hx
> >> @@ -38,6 +38,7 @@ DEF("machine", HAS_ARG, QEMU_OPTION_machine, \
> >> " dump-guest-core=on|off include guest memory in
> >> a core dump (default=on)\n" " mem-merge=on|off
> >> controls memory merge support (default: on)\n" "
> >> igd-passthru=on|off controls IGD GFX passthrough support
> >> (default=off)\n"
> >> + " xen-platform-dev=on|off controls Xen Platform
> >> device (default=off)\n" " aes-key-wrap=on|off
> >> controls support for AES key wrapping (default=on)\n"
> >> " dea-key-wrap=on|off controls support for DEA key
> >> wrapping (default=on)\n" " suppress-vmdesc=on|off
> >> disables self-describing migration (default=off)\n"
> >
> >What are the obstacles preventing "-device xen-platform" from
> >working? It would be better than adding a new boolean option to
> >-machine.
>
> I guess the initial assumption was that changing the
> xen_platform_device value in Xen's options may cause some additional
> changes in platform configuration besides adding (or not) the Xen
> Platform device, hence a completely different machine type was chosen
> (xenfv).
>
> At the moment pc,accel=xen/xenfv selection mostly governs
> only the Xen Platform device presence. Also setting max_cpus to
> HVM_MAX_VCPUS depends on it, but this doesn't applicable to a
> 'pc,accel=xen' machine for some reason.
>
> If applying HVM_MAX_VCPUS to max_cpus is really necessary I think it's
> better to set it unconditionally for all 'accel=xen' HVM machine
> types inside xen_enabled() block. Right now it's missing for
> pc,accel=xen and q35,accel=xen.
If you are talking about MachineClass::max_cpus, note that it is
returned by query-machines, so it's supposed to be a static
value. Changing it a runtime would mean the query-machines value
is incorrect.
Is HVM_MAX_CPUS higher or lower than 255? If it's higher, does
it mean the current value on pc and q35 isn't accurate?
>
> I'll check if supplying the Xen platform device via the '-device' option
> will be ok for all usage cases.
Is HVM_MAX_CPUS something that needs to be enabled because of
accel=xen or because or the xen-platform device?
If it's just because of accel=xen, we could introduce a
AccelClass::max_cpus() method (we also have KVM-imposed CPU count
limits, currently implemented inside kvm_init()).
--
Eduardo
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next prev parent reply other threads:[~2018-03-12 21:44 UTC|newest]
Thread overview: 155+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-12 18:33 [RFC PATCH 00/30] Xen Q35 Bringup patches + support for PCIe Extended Capabilities for passed through devices Alexey Gerasimenko
2018-03-12 18:33 ` [RFC PATCH 01/12] libacpi: new DSDT ACPI table for Q35 Alexey Gerasimenko
2018-03-12 19:38 ` Konrad Rzeszutek Wilk
2018-03-12 20:10 ` Alexey G
2018-03-12 20:32 ` Konrad Rzeszutek Wilk
2018-03-12 21:19 ` Alexey G
2018-03-13 2:41 ` Tian, Kevin
2018-03-19 12:43 ` Roger Pau Monné
2018-03-19 13:57 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 02/12] Makefile: build and use new DSDT " Alexey Gerasimenko
2018-03-19 12:46 ` Roger Pau Monné
2018-03-19 14:18 ` Alexey G
2018-03-19 13:07 ` Jan Beulich
2018-03-19 14:10 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 03/12] hvmloader: add function to query an emulated machine type (i440/Q35) Alexey Gerasimenko
2018-03-13 17:26 ` Wei Liu
2018-03-13 17:58 ` Alexey G
2018-03-13 18:04 ` Wei Liu
2018-03-19 12:56 ` Roger Pau Monné
2018-03-19 16:26 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 04/12] hvmloader: add ACPI enabling for Q35 Alexey Gerasimenko
2018-03-13 17:26 ` Wei Liu
2018-03-19 13:01 ` Roger Pau Monné
2018-03-19 23:59 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 05/12] hvmloader: add Q35 DSDT table loading Alexey Gerasimenko
2018-03-19 14:45 ` Roger Pau Monné
2018-03-20 0:15 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 06/12] hvmloader: add basic Q35 support Alexey Gerasimenko
2018-03-19 15:30 ` Roger Pau Monné
2018-03-19 23:44 ` Alexey G
2018-03-20 9:20 ` Roger Pau Monné
2018-03-20 21:23 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 07/12] hvmloader: allocate MMCONFIG area in the MMIO hole + minor code refactoring Alexey Gerasimenko
2018-03-19 15:58 ` Roger Pau Monné
2018-03-19 19:49 ` Alexey G
2018-03-20 8:50 ` Roger Pau Monné
2018-03-20 9:25 ` Paul Durrant
2018-03-21 0:58 ` Alexey G
2018-03-21 9:09 ` Roger Pau Monné
2018-03-21 9:36 ` Paul Durrant
2018-03-21 14:35 ` Alexey G
2018-03-21 14:58 ` Paul Durrant
2018-03-21 14:25 ` Alexey G
2018-03-21 14:54 ` Paul Durrant
2018-03-21 17:41 ` Alexey G
2018-03-21 15:20 ` Roger Pau Monné
2018-03-21 16:56 ` Alexey G
2018-03-21 17:06 ` Paul Durrant
2018-03-22 0:31 ` Alexey G
2018-03-22 9:04 ` Jan Beulich
2018-03-22 9:55 ` Alexey G
2018-03-22 10:06 ` Paul Durrant
2018-03-22 11:56 ` Alexey G
2018-03-22 12:09 ` Jan Beulich
2018-03-22 13:05 ` Alexey G
2018-03-22 13:20 ` Jan Beulich
2018-03-22 14:34 ` Alexey G
2018-03-22 14:42 ` Jan Beulich
2018-03-22 15:08 ` Alexey G
2018-03-23 13:57 ` Paul Durrant
2018-03-23 22:32 ` Alexey G
2018-03-26 9:24 ` Roger Pau Monné
2018-03-26 19:42 ` Alexey G
2018-03-27 8:45 ` Roger Pau Monné
2018-03-27 15:37 ` Alexey G
2018-03-28 9:30 ` Roger Pau Monné
2018-03-28 11:42 ` Alexey G
2018-03-28 12:05 ` Paul Durrant
2018-03-28 10:03 ` Paul Durrant
2018-03-28 14:14 ` Alexey G
2018-03-21 17:15 ` Roger Pau Monné
2018-03-21 22:49 ` Alexey G
2018-03-22 9:29 ` Paul Durrant
2018-03-22 10:05 ` Roger Pau Monné
2018-03-22 10:09 ` Paul Durrant
2018-03-22 11:36 ` Alexey G
2018-03-22 10:50 ` Alexey G
2018-03-22 9:57 ` Roger Pau Monné
2018-03-22 12:29 ` Alexey G
2018-03-22 12:44 ` Roger Pau Monné
2018-03-22 15:31 ` Alexey G
2018-03-23 10:29 ` Paul Durrant
2018-03-23 11:38 ` Jan Beulich
2018-03-23 13:52 ` Paul Durrant
2018-05-29 14:23 ` Jan Beulich
2018-05-29 17:56 ` Alexey G
2018-05-29 18:47 ` Alexey G
2018-05-30 4:32 ` Alexey G
2018-05-30 8:13 ` Jan Beulich
2018-05-31 4:25 ` Alexey G
2018-05-30 8:12 ` Jan Beulich
2018-05-31 5:15 ` Alexey G
2018-06-01 5:30 ` Jan Beulich
2018-06-01 15:53 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 08/12] libxl: Q35 support (new option device_model_machine) Alexey Gerasimenko
2018-03-13 17:25 ` Wei Liu
2018-03-13 17:32 ` Anthony PERARD
2018-03-19 17:01 ` Roger Pau Monné
2018-03-19 22:11 ` Alexey G
2018-03-20 9:11 ` Roger Pau Monné
2018-03-21 16:27 ` Wei Liu
2018-03-21 17:03 ` Anthony PERARD
2018-03-21 16:25 ` Wei Liu
2018-03-12 18:33 ` [RFC PATCH 09/12] libxl: Xen Platform device support for Q35 Alexey Gerasimenko
2018-03-19 15:05 ` Alexey G
2018-03-21 16:32 ` Wei Liu
2018-03-12 18:33 ` [RFC PATCH 10/12] libacpi: build ACPI MCFG table if requested Alexey Gerasimenko
2018-03-19 17:33 ` Roger Pau Monné
2018-03-19 21:46 ` Alexey G
2018-03-20 9:03 ` Roger Pau Monné
2018-03-20 21:06 ` Alexey G
2018-05-29 14:36 ` Jan Beulich
2018-05-29 18:20 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 11/12] hvmloader: use libacpi to build MCFG table Alexey Gerasimenko
2018-03-14 17:48 ` Alexey G
2018-03-19 17:49 ` Roger Pau Monné
2018-03-19 21:20 ` Alexey G
2018-03-20 8:58 ` Roger Pau Monné
2018-03-20 9:36 ` Jan Beulich
2018-03-20 20:53 ` Alexey G
2018-03-21 7:36 ` Jan Beulich
2018-05-29 14:46 ` Jan Beulich
2018-05-29 17:26 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 12/12] docs: provide description for device_model_machine option Alexey Gerasimenko
2018-03-12 18:33 ` [RFC PATCH 13/30] pc/xen: Xen Q35 support: provide IRQ handling for PCI devices Alexey Gerasimenko
2018-03-14 10:48 ` Paolo Bonzini
[not found] ` <406abf99-4311-f08d-9f61-df72a9a3ef05@redhat.com>
2018-03-14 11:28 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 14/30] pc/q35: Apply PCI bus BSEL property for Xen PCI device hotplug Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 15/30] q35/acpi/xen: Provide ACPI PCI hotplug interface for Xen on Q35 Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 16/30] q35/xen: Add Xen platform device support for Q35 Alexey Gerasimenko
2018-03-12 19:44 ` Eduardo Habkost
[not found] ` <20180312194406.GX3417@localhost.localdomain>
2018-03-12 20:56 ` Alexey G
2018-03-12 21:44 ` Eduardo Habkost [this message]
[not found] ` <20180312214402.GY3417@localhost.localdomain>
2018-03-13 23:49 ` Alexey G
2018-03-13 9:24 ` [Qemu-devel] " Daniel P. Berrangé
2018-03-12 18:34 ` [RFC PATCH 17/30] q35: Fix incorrect values for PCIEXBAR masks Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 18/30] xen/pt: XenHostPCIDevice: provide functions for PCI Capabilities and PCIe Extended Capabilities enumeration Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 19/30] xen/pt: avoid reading PCIe device type and cap version multiple times Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 20/30] xen/pt: determine the legacy/PCIe mode for a passed through device Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 21/30] xen/pt: Xen PCIe passthrough support for Q35: bypass PCIe topology check Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 22/30] xen/pt: add support for PCIe Extended Capabilities and larger config space Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 23/30] xen/pt: handle PCIe Extended Capabilities Next register Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 24/30] xen/pt: allow to hide PCIe Extended Capabilities Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 25/30] xen/pt: add Vendor-specific PCIe Extended Capability descriptor and sizing Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 26/30] xen/pt: add fixed-size PCIe Extended Capabilities descriptors Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 27/30] xen/pt: add AER PCIe Extended Capability descriptor and sizing Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 28/30] xen/pt: add descriptors and size calculation for RCLD/ACS/PMUX/DPA/MCAST/TPH/DPC PCIe Extended Capabilities Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 29/30] xen/pt: add Resizable BAR PCIe Extended Capability descriptor and sizing Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 30/30] xen/pt: add VC/VC9/MFVC PCIe Extended Capabilities descriptors " Alexey Gerasimenko
2018-03-13 9:21 ` [Qemu-devel] [RFC PATCH 00/30] Xen Q35 Bringup patches + support for PCIe Extended Capabilities for passed through devices Daniel P. Berrangé
2018-03-13 11:37 ` Alexey G
2018-03-13 11:44 ` Daniel P. Berrangé
2018-03-16 17:34 ` Alexey G
2018-03-16 18:26 ` Stefano Stabellini
2018-03-16 18:36 ` Roger Pau Monné
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