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[PATCH v6 4/5] Revert "vfio: Avoid disabling and enabling vectors repeat
From: |
Longpeng(Mike) |
Subject: |
[PATCH v6 4/5] Revert "vfio: Avoid disabling and enabling vectors repeatedly in VFIO migration" |
Date: |
Sat, 26 Mar 2022 14:02:25 +0800 |
Commit ecebe53fe993 ("vfio: Avoid disabling and enabling vectors
repeatedly in VFIO migration") avoids inefficiently disabling and
enabling vectors repeatedly and lets the unmasked vectors be enabled
one by one.
But we want to batch multiple routes and defer the commit, and only
commit once outside the loop of setting vector notifiers, so we
cannot enable the vectors one by one in the loop now.
Revert that commit and we will take another way in the next patch,
it can not only avoid disabling/enabling vectors repeatedly, but
also satisfy our requirement of defer to commit.
Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
---
hw/vfio/pci.c | 20 +++-----------------
1 file changed, 3 insertions(+), 17 deletions(-)
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 6f49e71cd4..6801391cf6 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -572,9 +572,6 @@ static void vfio_msix_vector_release(PCIDevice *pdev,
unsigned int nr)
static void vfio_msix_enable(VFIOPCIDevice *vdev)
{
- PCIDevice *pdev = &vdev->pdev;
- unsigned int nr, max_vec = 0;
-
vfio_disable_interrupts(vdev);
vdev->msi_vectors = g_new0(VFIOMSIVector, vdev->msix->entries);
@@ -593,22 +590,11 @@ static void vfio_msix_enable(VFIOPCIDevice *vdev)
* triggering to userspace, then immediately release the vector, leaving
* the physical device with no vectors enabled, but MSI-X enabled, just
* like the guest view.
- * If there are already unmasked vectors (in migration resume phase and
- * some guest startups) which will be enabled soon, we can allocate all
- * of them here to avoid inefficiently disabling and enabling vectors
- * repeatedly later.
*/
- if (!pdev->msix_function_masked) {
- for (nr = 0; nr < msix_nr_vectors_allocated(pdev); nr++) {
- if (!msix_is_masked(pdev, nr)) {
- max_vec = nr;
- }
- }
- }
- vfio_msix_vector_do_use(pdev, max_vec, NULL, NULL);
- vfio_msix_vector_release(pdev, max_vec);
+ vfio_msix_vector_do_use(&vdev->pdev, 0, NULL, NULL);
+ vfio_msix_vector_release(&vdev->pdev, 0);
- if (msix_set_vector_notifiers(pdev, vfio_msix_vector_use,
+ if (msix_set_vector_notifiers(&vdev->pdev, vfio_msix_vector_use,
vfio_msix_vector_release, NULL)) {
error_report("vfio: msix_set_vector_notifiers failed");
}
--
2.23.0
- [PATCH v6 0/5] optimize the downtime for vfio migration, Longpeng(Mike), 2022/03/26
- [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) <=
- Re: [PATCH v6 0/5] optimize the downtime for vfio migration, Alex Williamson, 2022/03/28