From: Peter Maydell <peter.maydell@linaro.org>
To: "Cédric Le Goater" <clg@kaod.org>
Cc: David Gibson <david@gibson.dropbear.id.au>,
qemu-ppc <qemu-ppc@nongnu.org>,
QEMU Developers <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH v5 27/36] sysbus: add a sysbus_mmio_unmap() helper
Date: Tue, 4 Dec 2018 13:04:34 +0000 [thread overview]
Message-ID: <CAFEAcA_3Qy1R8uOT_QayXfUneQT0_rL3J3Rv_uTG0DDFSCyRvQ@mail.gmail.com> (raw)
In-Reply-To: <f92e8c2c-3384-ba88-3d85-0c168441b052@kaod.org>
On Tue, 4 Dec 2018 at 12:33, Cédric Le Goater <clg@kaod.org> wrote:
> A completely new interrupt controller was introduced on the POWER9
> processor and it uses MMIO regions for interrupt management. These
> regions are backed by simple MRs in QEMU, when using TCG, and backed
> by ram_device_ptr MRs under KVM.
>
> Difficulties arise with the fact that POWER9 pseries guests need
> to support the old mode (XICS, no MMIOs) and the new mode XIVE.
> The interrupt mode is negotiated at boot between the hypervisor
> and the guest and a reset is generated to take into account
> the changes. Which means that, at reset, we may need to disconnect
> from a KVM IC device and reconnect to another.
This is a painful API for QEMU to implement, incidentally,
because we don't have any concept really of a warm reset. In
theory reset should get you back to exactly the same state
as if you'd just started QEMU. You can probably bodge something
together, though.
> When switching from XICS to XIVE mode :
>
> if kvm
> - destroy KVM XICS device
> - create KVM XIVE device
> - get fd, mmap, init ram_device_ptr MRs
> - map mmio
> - enable MMIOs
>
> When switching from XIVE to XICS :
>
> - disable MMIOs
> if kvm
> - delete MRs
> - munmap
> - destroy KVM XIVE device
> - create KVM XICS device
This seems basically OK, I think.
thanks
-- PMM
next prev parent reply other threads:[~2018-12-04 13:04 UTC|newest]
Thread overview: 184+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-16 10:56 [Qemu-devel] [PATCH v5 00/36] ppc: support for the XIVE interrupt controller (POWER9) Cédric Le Goater
2018-11-16 10:56 ` [Qemu-devel] [PATCH v5 01/36] ppc/xive: introduce a XIVE interrupt source model Cédric Le Goater
2018-11-22 3:05 ` David Gibson
2018-11-22 7:25 ` Cédric Le Goater
2018-11-23 0:31 ` David Gibson
2018-11-23 8:21 ` Cédric Le Goater
2018-11-26 8:14 ` Cédric Le Goater
2018-11-16 10:56 ` [Qemu-devel] [PATCH v5 02/36] ppc/xive: add support for the LSI interrupt sources Cédric Le Goater
2018-11-22 3:19 ` David Gibson
2018-11-22 7:39 ` Cédric Le Goater
2018-11-23 1:08 ` David Gibson
2018-11-23 13:28 ` Cédric Le Goater
2018-11-26 5:39 ` David Gibson
2018-11-26 11:20 ` Cédric Le Goater
2018-11-26 23:48 ` David Gibson
2018-11-27 7:30 ` Cédric Le Goater
2018-11-16 10:56 ` [Qemu-devel] [PATCH v5 03/36] ppc/xive: introduce the XiveFabric interface Cédric Le Goater
2018-11-16 10:56 ` [Qemu-devel] [PATCH v5 04/36] ppc/xive: introduce the XiveRouter model Cédric Le Goater
2018-11-22 4:11 ` David Gibson
2018-11-22 7:53 ` Cédric Le Goater
2018-11-23 3:50 ` David Gibson
2018-11-23 8:06 ` Cédric Le Goater
2018-11-27 1:54 ` David Gibson
2018-11-27 8:45 ` Cédric Le Goater
2018-11-22 4:44 ` David Gibson
2018-11-22 6:50 ` Benjamin Herrenschmidt
2018-11-22 7:59 ` Cédric Le Goater
2018-11-23 1:17 ` David Gibson
2018-11-23 1:10 ` David Gibson
2018-11-23 10:28 ` Cédric Le Goater
2018-11-26 5:44 ` David Gibson
2018-11-26 9:39 ` Cédric Le Goater
2018-11-27 0:11 ` David Gibson
2018-11-27 7:30 ` Cédric Le Goater
2018-11-27 22:56 ` David Gibson
2018-11-16 10:56 ` [Qemu-devel] [PATCH v5 05/36] ppc/xive: introduce the XIVE Event Notification Descriptors Cédric Le Goater
2018-11-22 4:41 ` David Gibson
2018-11-22 6:49 ` Benjamin Herrenschmidt
2018-11-23 3:51 ` David Gibson
2018-11-22 21:47 ` Cédric Le Goater
2018-11-23 4:35 ` David Gibson
2018-11-23 11:01 ` Cédric Le Goater
2018-11-29 4:46 ` David Gibson
2018-11-16 10:56 ` [Qemu-devel] [PATCH v5 06/36] ppc/xive: add support for the END Event State buffers Cédric Le Goater
2018-11-22 5:13 ` David Gibson
2018-11-22 21:58 ` Cédric Le Goater
2018-11-23 4:36 ` David Gibson
2018-11-23 7:28 ` Cédric Le Goater
2018-11-26 5:54 ` David Gibson
2018-11-29 22:06 ` Cédric Le Goater
2018-11-30 1:04 ` David Gibson
2018-11-30 6:41 ` Cédric Le Goater
2018-12-03 1:14 ` David Gibson
2018-12-03 16:19 ` Cédric Le Goater
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 07/36] ppc/xive: introduce the XIVE interrupt thread context Cédric Le Goater
2018-11-23 5:08 ` David Gibson
2018-11-25 20:35 ` Cédric Le Goater
2018-11-27 5:07 ` David Gibson
2018-11-27 12:47 ` Cédric Le Goater
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 08/36] ppc/xive: introduce a simplified XIVE presenter Cédric Le Goater
2018-11-27 23:49 ` David Gibson
2018-11-28 2:34 ` Benjamin Herrenschmidt
2018-11-28 10:59 ` Cédric Le Goater
2018-11-29 0:47 ` David Gibson
2018-11-29 3:39 ` Benjamin Herrenschmidt
2018-11-29 17:51 ` Cédric Le Goater
2018-11-30 1:09 ` David Gibson
2018-12-03 17:05 ` Cédric Le Goater
2018-12-04 1:54 ` David Gibson
2018-12-04 17:04 ` Cédric Le Goater
2018-12-05 1:40 ` David Gibson
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 09/36] ppc/xive: notify the CPU when the interrupt priority is more privileged Cédric Le Goater
2018-11-28 0:13 ` David Gibson
2018-11-28 2:32 ` Benjamin Herrenschmidt
2018-11-28 2:41 ` David Gibson
2018-11-28 3:00 ` Eric Blake
2018-11-28 11:30 ` Cédric Le Goater
2018-11-29 0:49 ` David Gibson
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 10/36] spapr/xive: introduce a XIVE interrupt controller Cédric Le Goater
2018-11-28 0:52 ` David Gibson
2018-11-28 16:27 ` Cédric Le Goater
2018-11-29 0:54 ` David Gibson
2018-11-29 14:37 ` Cédric Le Goater
2018-11-29 22:36 ` David Gibson
2018-12-04 17:12 ` Cédric Le Goater
2018-12-05 1:41 ` David Gibson
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 11/36] spapr/xive: use the VCPU id as a NVT identifier Cédric Le Goater
2018-11-28 2:39 ` David Gibson
2018-11-28 16:48 ` Cédric Le Goater
2018-11-29 1:00 ` David Gibson
2018-11-29 15:27 ` Cédric Le Goater
2018-11-30 1:11 ` David Gibson
2018-11-30 6:56 ` Cédric Le Goater
2018-12-03 1:18 ` David Gibson
2018-12-03 16:30 ` Cédric Le Goater
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 12/36] spapr: initialize VSMT before initializing the IRQ backend Cédric Le Goater
2018-11-28 2:57 ` David Gibson
2018-11-28 9:35 ` [Qemu-devel] [Qemu-ppc] " Greg Kurz
2018-11-28 16:50 ` Cédric Le Goater
2018-11-28 16:59 ` Greg Kurz
2018-11-29 1:02 ` David Gibson
2018-11-29 6:56 ` Greg Kurz
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 13/36] spapr: introduce a spapr_irq_init() routine Cédric Le Goater
2018-11-28 2:59 ` David Gibson
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 14/36] spapr: modify the irq backend 'init' method Cédric Le Goater
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 15/36] spapr: introdude a new machine IRQ backend for XIVE Cédric Le Goater
2018-11-28 3:28 ` David Gibson
2018-11-28 17:16 ` Cédric Le Goater
2018-11-29 1:07 ` David Gibson
2018-11-29 15:34 ` Cédric Le Goater
2018-11-29 22:39 ` David Gibson
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 16/36] spapr: add hcalls support for the XIVE exploitation interrupt mode Cédric Le Goater
2018-11-28 4:25 ` David Gibson
2018-11-28 22:21 ` Cédric Le Goater
2018-11-29 1:23 ` David Gibson
2018-11-29 16:04 ` Cédric Le Goater
2018-11-30 1:23 ` David Gibson
2018-11-30 8:07 ` Cédric Le Goater
2018-12-03 1:36 ` David Gibson
2018-12-03 16:49 ` Cédric Le Goater
2018-12-04 1:56 ` David Gibson
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 17/36] spapr: add device tree support for the XIVE exploitation mode Cédric Le Goater
2018-11-28 4:31 ` David Gibson
2018-11-28 22:26 ` Cédric Le Goater
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 18/36] spapr: allocate the interrupt thread context under the CPU core Cédric Le Goater
2018-11-28 4:39 ` David Gibson
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 19/36] spapr: add a 'pseries-3.1-xive' machine type Cédric Le Goater
2018-11-28 4:42 ` David Gibson
2018-11-28 22:37 ` Cédric Le Goater
2018-12-04 15:14 ` Cédric Le Goater
2018-12-05 1:44 ` David Gibson
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 20/36] spapr: add classes for the XIVE models Cédric Le Goater
2018-11-28 5:13 ` David Gibson
2018-11-28 22:38 ` Cédric Le Goater
2018-11-29 2:59 ` David Gibson
2018-11-29 16:06 ` Cédric Le Goater
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 21/36] spapr: extend the sPAPR IRQ backend for XICS migration Cédric Le Goater
2018-11-28 5:54 ` David Gibson
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 22/36] spapr/xive: add models for KVM support Cédric Le Goater
2018-11-28 5:52 ` David Gibson
2018-11-28 22:45 ` Cédric Le Goater
2018-11-29 3:33 ` David Gibson
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 23/36] spapr/xive: add migration support for KVM Cédric Le Goater
2018-11-29 3:43 ` David Gibson
2018-11-29 16:19 ` Cédric Le Goater
2018-11-30 1:24 ` David Gibson
2018-11-30 7:04 ` Cédric Le Goater
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 24/36] spapr: add a 'reset' method to the sPAPR IRQ backend Cédric Le Goater
2018-11-29 3:47 ` David Gibson
2018-11-29 16:21 ` Cédric Le Goater
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 25/36] spapr: set the interrupt presenter at reset Cédric Le Goater
2018-11-29 4:03 ` David Gibson
2018-11-29 16:28 ` Cédric Le Goater
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 26/36] spapr: add a 'pseries-3.1-dual' machine type Cédric Le Goater
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 27/36] sysbus: add a sysbus_mmio_unmap() helper Cédric Le Goater
2018-11-29 4:09 ` David Gibson
2018-11-29 16:36 ` Cédric Le Goater
2018-12-03 15:52 ` Cédric Le Goater
2018-12-04 1:59 ` David Gibson
2018-12-03 17:48 ` Peter Maydell
2018-12-04 12:33 ` Cédric Le Goater
2018-12-04 13:04 ` Peter Maydell [this message]
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 28/36] ppc/xics: introduce a icp_kvm_init() routine Cédric Le Goater
2018-11-29 4:08 ` David Gibson
2018-11-29 16:36 ` Cédric Le Goater
2018-11-29 22:43 ` David Gibson
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 29/36] ppc/xics: remove abort() in icp_kvm_init() Cédric Le Goater
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 30/36] spapr: check for KVM IRQ device activation Cédric Le Goater
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 31/36] spapr/xive: export the spapr_xive_kvm_init() routine Cédric Le Goater
2018-11-29 4:11 ` David Gibson
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 32/36] spapr/rtas: modify spapr_rtas_register() to remove RTAS handlers Cédric Le Goater
2018-11-29 4:12 ` David Gibson
2018-11-29 16:40 ` Cédric Le Goater
2018-11-29 22:44 ` David Gibson
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 33/36] spapr: introduce routines to delete the KVM IRQ device Cédric Le Goater
2018-11-29 4:17 ` David Gibson
2018-11-29 16:41 ` Cédric Le Goater
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 34/36] spapr: add KVM support to the 'dual' machine Cédric Le Goater
2018-11-29 4:22 ` David Gibson
2018-11-29 17:07 ` Cédric Le Goater
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 35/36] ppc: externalize ppc_get_vcpu_by_pir() Cédric Le Goater
2018-11-16 10:57 ` [Qemu-devel] [PATCH v5 36/36] ppc/pnv: add XIVE support Cédric Le Goater
2018-12-03 2:26 ` David Gibson
2018-12-06 15:14 ` Cédric Le Goater
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