This is a note to let you know that I've just added the patch titled
PCI: hv: Use effective affinity mask
to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: pci-hv-use-effective-affinity-mask.patch and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 79aa801e899417a56863d6713f76c4e108856000 Mon Sep 17 00:00:00 2001
From: Dexuan Cui decui@microsoft.com Date: Wed, 1 Nov 2017 20:30:53 +0000 Subject: PCI: hv: Use effective affinity mask
From: Dexuan Cui decui@microsoft.com
commit 79aa801e899417a56863d6713f76c4e108856000 upstream.
The effective_affinity_mask is always set when an interrupt is assigned in __assign_irq_vector() -> apic->cpu_mask_to_apicid(), e.g. for struct apic apic_physflat: -> default_cpu_mask_to_apicid() -> irq_data_update_effective_affinity(), but it looks d->common->affinity remains all-1's before the user space or the kernel changes it later.
In the early allocation/initialization phase of an IRQ, we should use the effective_affinity_mask, otherwise Hyper-V may not deliver the interrupt to the expected CPU. Without the patch, if we assign 7 Mellanox ConnectX-3 VFs to a 32-vCPU VM, one of the VFs may fail to receive interrupts.
Tested-by: Adrian Suhov v-adsuho@microsoft.com Signed-off-by: Dexuan Cui decui@microsoft.com Signed-off-by: Bjorn Helgaas bhelgaas@google.com Reviewed-by: Jake Oshins jakeo@microsoft.com Cc: Jork Loeser jloeser@microsoft.com Cc: Stephen Hemminger sthemmin@microsoft.com Cc: K. Y. Srinivasan kys@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/pci/host/pci-hyperv.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
--- a/drivers/pci/host/pci-hyperv.c +++ b/drivers/pci/host/pci-hyperv.c @@ -879,7 +879,7 @@ static void hv_irq_unmask(struct irq_dat int cpu; u64 res;
- dest = irq_data_get_affinity_mask(data); + dest = irq_data_get_effective_affinity_mask(data); pdev = msi_desc_to_pci_dev(msi_desc); pbus = pdev->bus; hbus = container_of(pbus->sysdata, struct hv_pcibus_device, sysdata); @@ -1042,6 +1042,7 @@ static void hv_compose_msi_msg(struct ir struct hv_pci_dev *hpdev; struct pci_bus *pbus; struct pci_dev *pdev; + struct cpumask *dest; struct compose_comp_ctxt comp; struct tran_int_desc *int_desc; struct { @@ -1056,6 +1057,7 @@ static void hv_compose_msi_msg(struct ir int ret;
pdev = msi_desc_to_pci_dev(irq_data_get_msi_desc(data)); + dest = irq_data_get_effective_affinity_mask(data); pbus = pdev->bus; hbus = container_of(pbus->sysdata, struct hv_pcibus_device, sysdata); hpdev = get_pcichild_wslot(hbus, devfn_to_wslot(pdev->devfn)); @@ -1081,14 +1083,14 @@ static void hv_compose_msi_msg(struct ir switch (pci_protocol_version) { case PCI_PROTOCOL_VERSION_1_1: size = hv_compose_msi_req_v1(&ctxt.int_pkts.v1, - irq_data_get_affinity_mask(data), + dest, hpdev->desc.win_slot.slot, cfg->vector); break;
case PCI_PROTOCOL_VERSION_1_2: size = hv_compose_msi_req_v2(&ctxt.int_pkts.v2, - irq_data_get_affinity_mask(data), + dest, hpdev->desc.win_slot.slot, cfg->vector); break;
Patches currently in stable-queue which might be from decui@microsoft.com are
queue-4.14/pci-hv-use-effective-affinity-mask.patch