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[PATCH v6 0/5] optimize the downtime for vfio migration
From: |
Longpeng(Mike) |
Subject: |
[PATCH v6 0/5] optimize the downtime for vfio migration |
Date: |
Sat, 26 Mar 2022 14:02:21 +0800 |
From: Longpeng <longpeng2@huawei.com>
Hi guys,
In vfio migration resume phase, the cost would increase if the
vfio device has more unmasked vectors. We try to optimize it in
this series.
You can see the commit message in PATCH 6 for details.
Patch 1-3 are simple cleanups and fixup.
Patch 4 are the preparations for the optimization.
Patch 5 optimizes the vfio msix setup path.
v5: https://lore.kernel.org/all/20211103081657.1945-1-longpeng2@huawei.com/T/
Change v5->v6:
- remove the Patch 4("kvm: irqchip: extract
kvm_irqchip_add_deferred_msi_route")
of v5, and use KVMRouteChange API instead. [Paolo, Longpeng]
Changes v4->v5:
- setup the notifier and irqfd in the same function to makes
the code neater. [Alex]
Changes v3->v4:
- fix several typos and grammatical errors [Alex]
- remove the patches that fix and clean the MSIX common part
from this series [Alex]
- Patch 6:
- use vector->use directly and fill it with -1 on error
paths [Alex]
- add comment before enable deferring to commit [Alex]
- move the code that do_use/release on vector 0 into an
"else" branch [Alex]
- introduce vfio_prepare_kvm_msi_virq_batch() that enables
the 'defer_kvm_irq_routing' flag [Alex]
- introduce vfio_commit_kvm_msi_virq_batch() that clears the
'defer_kvm_irq_routing' flag and does further work [Alex]
Changes v2->v3:
- fix two errors [Longpeng]
Changes v1->v2:
- fix several typos and grammatical errors [Alex, Philippe]
- split fixups and cleanups into separate patches [Alex, Philippe]
- introduce kvm_irqchip_add_deferred_msi_route to
minimize code changes [Alex]
- enable the optimization in msi setup path [Alex]
Longpeng (Mike) (5):
vfio: simplify the conditional statements in vfio_msi_enable
vfio: move re-enabling INTX out of the common helper
vfio: simplify the failure path in vfio_msi_enable
Revert "vfio: Avoid disabling and enabling vectors repeatedly in VFIO
migration"
vfio: defer to commit kvm irq routing when enable msi/msix
hw/vfio/pci.c | 183 +++++++++++++++++++++++++++++++-------------------
hw/vfio/pci.h | 2 +
2 files changed, 115 insertions(+), 70 deletions(-)
--
2.23.0
- [PATCH v6 0/5] optimize the downtime for vfio migration,
Longpeng(Mike) <=
- [PATCH v6 5/5] vfio: defer to commit kvm irq routing when enable msi/msix, Longpeng(Mike), 2022/03/26
- [PATCH v6 1/5] vfio: simplify the conditional statements in vfio_msi_enable, Longpeng(Mike), 2022/03/26
- [PATCH v6 3/5] vfio: simplify the failure path in vfio_msi_enable, Longpeng(Mike), 2022/03/26
- [PATCH v6 2/5] vfio: move re-enabling INTX out of the common helper, Longpeng(Mike), 2022/03/26
- [PATCH v6 4/5] Revert "vfio: Avoid disabling and enabling vectors repeatedly in VFIO migration", Longpeng(Mike), 2022/03/26
- Re: [PATCH v6 0/5] optimize the downtime for vfio migration, Alex Williamson, 2022/03/28