From db32d0f43839627f54a1a7f8eee17baa770f52d2 Mon Sep 17 00:00:00 2001 From: Alex Williamson Date: Tue, 6 Feb 2018 11:08:27 -0700 Subject: [PATCH] vfio/pci: Add option to disable GeForce quirks These quirks are necessary for GeForce, but not for Quadro/GRID/Tesla assignment. Leaving them enabled is fully functional and provides the most compatibility, but due to the unique NVIDIA MSI ACK behavior[1], it also introduces latency in re-triggering the MSI interrupt. This overhead is typically negligible, but has been shown to adversely affect some (very) high interrupt rate applications. This adds the vfio-pci device option "x-no-geforce-quirks=" which can be set to "on" to disable this additional overhead. A follow-on optimization for GeForce might be to make use of an ioeventfd to allow KVM to trigger an irqfd in the kernel vfio-pci driver, avoiding the bounce through userspace to handle this device write. [1] Background: the NVIDIA driver has been observed to issue a write to the MMIO mirror of PCI config space in BAR0 in order to allow the MSI interrupt for the device to retrigger. Older reports indicated a write of 0xff to the (read-only) MSI capability ID register, while more recently a write of 0x0 is observed at config space offset 0x704, non-architected, extended config space of the device (BAR0 offset 0x88704). Virtualization of this range is only required for GeForce. Signed-off-by: Alex Williamson --- hw/vfio/pci-quirks.c | 9 ++++++--- hw/vfio/pci.c | 2 ++ hw/vfio/pci.h | 1 + 3 files changed, 9 insertions(+), 3 deletions(-) diff --git a/hw/vfio/pci-quirks.c b/hw/vfio/pci-quirks.c index 60ad5fb91a..e5779a7ad3 100644 --- a/hw/vfio/pci-quirks.c +++ b/hw/vfio/pci-quirks.c @@ -542,7 +542,8 @@ static void vfio_vga_probe_nvidia_3d0_quirk(VFIOPCIDevice *vdev) VFIOQuirk *quirk; VFIONvidia3d0Quirk *data; - if (!vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID) || + if (vdev->no_geforce_quirks || + !vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID) || !vdev->bars[1].region.size) { return; } @@ -660,7 +661,8 @@ static void vfio_probe_nvidia_bar5_quirk(VFIOPCIDevice *vdev, int nr) VFIONvidiaBAR5Quirk *bar5; VFIOConfigWindowQuirk *window; - if (!vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID) || + if (vdev->no_geforce_quirks || + !vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID) || !vdev->vga || nr != 5 || !vdev->bars[5].ioport) { return; } @@ -754,7 +756,8 @@ static void vfio_probe_nvidia_bar0_quirk(VFIOPCIDevice *vdev, int nr) VFIOQuirk *quirk; VFIOConfigMirrorQuirk *mirror; - if (!vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID) || + if (vdev->no_geforce_quirks || + !vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID) || !vfio_is_vga(vdev) || nr != 0) { return; } diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index cab2aecb80..879510c046 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -3130,6 +3130,8 @@ static Property vfio_pci_dev_properties[] = { DEFINE_PROP_BOOL("x-no-kvm-intx", VFIOPCIDevice, no_kvm_intx, false), DEFINE_PROP_BOOL("x-no-kvm-msi", VFIOPCIDevice, no_kvm_msi, false), DEFINE_PROP_BOOL("x-no-kvm-msix", VFIOPCIDevice, no_kvm_msix, false), + DEFINE_PROP_BOOL("x-no-geforce-quirks", VFIOPCIDevice, + no_geforce_quirks, false), DEFINE_PROP_UINT32("x-pci-vendor-id", VFIOPCIDevice, vendor_id, PCI_ANY_ID), DEFINE_PROP_UINT32("x-pci-device-id", VFIOPCIDevice, device_id, PCI_ANY_ID), DEFINE_PROP_UINT32("x-pci-sub-vendor-id", VFIOPCIDevice, diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h index 588381f201..f4aa13e021 100644 --- a/hw/vfio/pci.h +++ b/hw/vfio/pci.h @@ -146,6 +146,7 @@ typedef struct VFIOPCIDevice { bool no_kvm_intx; bool no_kvm_msi; bool no_kvm_msix; + bool no_geforce_quirks; } VFIOPCIDevice; uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len);