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Subject[PATCH v3] PCI: hv: Fix hibernation in case interrupts are not re-created
Date
pci_restore_msi_state() directly writes the MSI/MSI-X related registers
via MMIO. On a physical machine, this works perfectly; for a Linux VM
running on a hypervisor, which typically enables IOMMU interrupt remapping,
the hypervisor usually should trap and emulate the MMIO accesses in order
to re-create the necessary interrupt remapping table entries in the IOMMU,
otherwise the interrupts can not work in the VM after hibernation.

Hyper-V is different from other hypervisors in that it does not trap and
emulate the MMIO accesses, and instead it uses a para-virtualized method,
which requires the VM to call hv_compose_msi_msg() to notify the hypervisor
of the info that would be passed to the hypervisor in the case of the
trap-and-emulate method. This is not an issue to a lot of PCI device
drivers, which destroy and re-create the interrupts across hibernation, so
hv_compose_msi_msg() is called automatically. However, some PCI device
drivers (e.g. the in-tree GPU driver nouveau and the out-of-tree Nvidia
proprietary GPU driver) do not destroy and re-create MSI/MSI-X interrupts
across hibernation, so hv_pci_resume() has to call hv_compose_msi_msg(),
otherwise the PCI device drivers can no longer receive interrupts after
the VM resumes from hibernation.

Hyper-V is also different in that chip->irq_unmask() may fail in a
Linux VM running on Hyper-V (on a physical machine, chip->irq_unmask()
can not fail because unmasking an MSI/MSI-X register just means an MMIO
write): during hibernation, when a CPU is offlined, the kernel tries
to move the interrupt to the remaining CPUs that haven't been offlined
yet. In this case, hv_irq_unmask() -> hv_do_hypercall() always fails
because the vmbus channel has been closed: here the early "return" in
hv_irq_unmask() means the pci_msi_unmask_irq() is not called, i.e. the
desc->masked remains "true", so later after hibernation, the MSI interrupt
always remains masked, which is incorrect. Refer to cpu_disable_common()
-> fixup_irqs() -> irq_migrate_all_off_this_cpu() -> migrate_one_irq():

static bool migrate_one_irq(struct irq_desc *desc)
{
...
if (maskchip && chip->irq_mask)
chip->irq_mask(d);
...
err = irq_do_set_affinity(d, affinity, false);
...
if (maskchip && chip->irq_unmask)
chip->irq_unmask(d);

Fix the issue by calling pci_msi_unmask_irq() unconditionally in
hv_irq_unmask(). Also suppress the error message for hibernation because
the hypercall failure during hibernation does not matter (at this time
all the devices have been frozen). Note: the correct affinity info is
still updated into the irqdata data structure in migrate_one_irq() ->
irq_do_set_affinity() -> hv_set_affinity(), so later when the VM
resumes, hv_pci_restore_msi_state() is able to correctly restore
the interrupt with the correct affinity.

Fixes: ac82fc832708 ("PCI: hv: Add hibernation support")
Reviewed-by: Jake Oshins <jakeo@microsoft.com>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
---

Changes in v2:
Fixed a typo in the comment in hv_irq_unmask. Thanks to Michael!
Added Jake's Reviewed-by.

Changes in v3:
Improved the commit log.
Improved the comments.
Improved the change in hv_irq_unmask(): removed the early "return"
and call pci_msi_unmask_irq() unconditionally.

drivers/pci/controller/pci-hyperv.c | 50 +++++++++++++++++++++++++++--
1 file changed, 47 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index fc4c3a15e570..a9df492fbffa 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -1276,11 +1276,25 @@ static void hv_irq_unmask(struct irq_data *data)
exit_unlock:
spin_unlock_irqrestore(&hbus->retarget_msi_interrupt_lock, flags);

- if (res) {
+ /*
+ * During hibernation, when a CPU is offlined, the kernel tries
+ * to move the interrupt to the remaining CPUs that haven't
+ * been offlined yet. In this case, the below hv_do_hypercall()
+ * always fails since the vmbus channel has been closed:
+ * refer to cpu_disable_common() -> fixup_irqs() ->
+ * irq_migrate_all_off_this_cpu() -> migrate_one_irq().
+ *
+ * Suppress the error message for hibernation because the failure
+ * during hibernation does not matter (at this time all the devices
+ * have been frozen). Note: the correct affinity info is still updated
+ * into the irqdata data structure in migrate_one_irq() ->
+ * irq_do_set_affinity() -> hv_set_affinity(), so later when the VM
+ * resumes, hv_pci_restore_msi_state() is able to correctly restore
+ * the interrupt with the correct affinity.
+ */
+ if (res && hbus->state != hv_pcibus_removing)
dev_err(&hbus->hdev->device,
"%s() failed: %#llx", __func__, res);
- return;
- }

pci_msi_unmask_irq(data);
}
@@ -3372,6 +3386,34 @@ static int hv_pci_suspend(struct hv_device *hdev)
return 0;
}

+static int hv_pci_restore_msi_msg(struct pci_dev *pdev, void *arg)
+{
+ struct msi_desc *entry;
+ struct irq_data *irq_data;
+
+ for_each_pci_msi_entry(entry, pdev) {
+ irq_data = irq_get_irq_data(entry->irq);
+ if (WARN_ON_ONCE(!irq_data))
+ return -EINVAL;
+
+ hv_compose_msi_msg(irq_data, &entry->msg);
+ }
+
+ return 0;
+}
+
+/*
+ * Upon resume, pci_restore_msi_state() -> ... -> __pci_write_msi_msg()
+ * directly writes the MSI/MSI-X registers via MMIO, but since Hyper-V
+ * doesn't trap and emulate the MMIO accesses, here hv_compose_msi_msg()
+ * must be used to ask Hyper-V to re-create the IOMMU Interrupt Remapping
+ * Table entries.
+ */
+static void hv_pci_restore_msi_state(struct hv_pcibus_device *hbus)
+{
+ pci_walk_bus(hbus->pci_bus, hv_pci_restore_msi_msg, NULL);
+}
+
static int hv_pci_resume(struct hv_device *hdev)
{
struct hv_pcibus_device *hbus = hv_get_drvdata(hdev);
@@ -3405,6 +3447,8 @@ static int hv_pci_resume(struct hv_device *hdev)

prepopulate_bars(hbus);

+ hv_pci_restore_msi_state(hbus);
+
hbus->state = hv_pcibus_installed;
return 0;
out:
--
2.19.1
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