Messages in this thread | | | From | Dexuan Cui <> | Subject | RE: [PATCH v2] PCI: hv: Fix hibernation in case interrupts are not re-created | Date | Mon, 21 Sep 2020 17:01:42 +0000 |
| |
> From: Dexuan Cui <decui@microsoft.com> > Sent: Tuesday, September 8, 2020 4:18 PM > > Hyper-V doesn't trap and emulate the accesses to the MSI/MSI-X registers, > and we must use hv_compose_msi_msg() to ask Hyper-V to create the IOMMU > Interrupt Remapping Table Entries. This is not an issue for a lot of > PCI device drivers (e.g. NVMe driver, Mellanox NIC drivers), which > destroy and re-create the interrupts across hibernation, so > hv_compose_msi_msg() is called automatically. However, some other PCI > device drivers (e.g. the Nvidia driver) may not destroy and re-create > the interrupts across hibernation, so hv_pci_resume() has to call > hv_compose_msi_msg(), otherwise the PCI device drivers can no longer > receive MSI/MSI-X interrupts after hibernation. > > Fixes: ac82fc832708 ("PCI: hv: Add hibernation support") > Signed-off-by: Dexuan Cui <decui@microsoft.com> > Reviewed-by: Jake Oshins <jakeo@microsoft.com> > > --- > > Changes in v2: > Fixed a typo in the comment in hv_irq_unmask. Thanks to Michael! > Added Jake's Reviewed-by. > > drivers/pci/controller/pci-hyperv.c | 44 +++++++++++++++++++++++++++++ > 1 file changed, 44 insertions(+)
Hi Lorenzo, Bjorn, Can you please take a look at this patch? I hope it still could have a chance to be in 5.9. :-)
Thanks, -- Dexuan
| |