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qemu-kvm/kvm-vfio-iommufd-Enable-pci...

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From e94700896dd8fcea149d9719eccde6f485440be2 Mon Sep 17 00:00:00 2001
From: Zhenzhong Duan <zhenzhong.duan@intel.com>
Date: Tue, 21 Nov 2023 16:44:08 +0800
Subject: [PATCH 029/101] vfio/iommufd: Enable pci hot reset through iommufd
cdev interface
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Eric Auger <eric.auger@redhat.com>
RH-MergeRequest: 211: IOMMUFD backend backport
RH-Jira: RHEL-19302 RHEL-21057
RH-Acked-by: Cédric Le Goater <clg@redhat.com>
RH-Acked-by: Sebastian Ott <sebott@redhat.com>
RH-Commit: [28/67] ca1ae970138ee4a6f4b3b49817e775f3159f4c97 (eauger1/centos-qemu-kvm)
Implement the newly introduced pci_hot_reset callback named
iommufd_cdev_pci_hot_reset to do iommufd specific check and
reset operation.
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
(cherry picked from commit 96d6f85ff012abd7aaa35b1a2bc48b8640c898d9)
Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
hw/vfio/iommufd.c | 150 +++++++++++++++++++++++++++++++++++++++++++
hw/vfio/trace-events | 1 +
2 files changed, 151 insertions(+)
diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index 01b448e840..6e53e013ef 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -24,6 +24,7 @@
#include "sysemu/reset.h"
#include "qemu/cutils.h"
#include "qemu/chardev_open.h"
+#include "pci.h"
static int iommufd_cdev_map(VFIOContainerBase *bcontainer, hwaddr iova,
ram_addr_t size, void *vaddr, bool readonly)
@@ -468,9 +469,158 @@ static void iommufd_cdev_detach(VFIODevice *vbasedev)
close(vbasedev->fd);
}
+static VFIODevice *iommufd_cdev_pci_find_by_devid(__u32 devid)
+{
+ VFIODevice *vbasedev_iter;
+
+ QLIST_FOREACH(vbasedev_iter, &vfio_device_list, global_next) {
+ if (vbasedev_iter->bcontainer->ops != &vfio_iommufd_ops) {
+ continue;
+ }
+ if (devid == vbasedev_iter->devid) {
+ return vbasedev_iter;
+ }
+ }
+ return NULL;
+}
+
+static VFIOPCIDevice *
+iommufd_cdev_dep_get_realized_vpdev(struct vfio_pci_dependent_device *dep_dev,
+ VFIODevice *reset_dev)
+{
+ VFIODevice *vbasedev_tmp;
+
+ if (dep_dev->devid == reset_dev->devid ||
+ dep_dev->devid == VFIO_PCI_DEVID_OWNED) {
+ return NULL;
+ }
+
+ vbasedev_tmp = iommufd_cdev_pci_find_by_devid(dep_dev->devid);
+ if (!vbasedev_tmp || !vbasedev_tmp->dev->realized ||
+ vbasedev_tmp->type != VFIO_DEVICE_TYPE_PCI) {
+ return NULL;
+ }
+
+ return container_of(vbasedev_tmp, VFIOPCIDevice, vbasedev);
+}
+
+static int iommufd_cdev_pci_hot_reset(VFIODevice *vbasedev, bool single)
+{
+ VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
+ struct vfio_pci_hot_reset_info *info = NULL;
+ struct vfio_pci_dependent_device *devices;
+ struct vfio_pci_hot_reset *reset;
+ int ret, i;
+ bool multi = false;
+
+ trace_vfio_pci_hot_reset(vdev->vbasedev.name, single ? "one" : "multi");
+
+ if (!single) {
+ vfio_pci_pre_reset(vdev);
+ }
+ vdev->vbasedev.needs_reset = false;
+
+ ret = vfio_pci_get_pci_hot_reset_info(vdev, &info);
+
+ if (ret) {
+ goto out_single;
+ }
+
+ assert(info->flags & VFIO_PCI_HOT_RESET_FLAG_DEV_ID);
+
+ devices = &info->devices[0];
+
+ if (!(info->flags & VFIO_PCI_HOT_RESET_FLAG_DEV_ID_OWNED)) {
+ if (!vdev->has_pm_reset) {
+ for (i = 0; i < info->count; i++) {
+ if (devices[i].devid == VFIO_PCI_DEVID_NOT_OWNED) {
+ error_report("vfio: Cannot reset device %s, "
+ "depends on device %04x:%02x:%02x.%x "
+ "which is not owned.",
+ vdev->vbasedev.name, devices[i].segment,
+ devices[i].bus, PCI_SLOT(devices[i].devfn),
+ PCI_FUNC(devices[i].devfn));
+ }
+ }
+ }
+ ret = -EPERM;
+ goto out_single;
+ }
+
+ trace_vfio_pci_hot_reset_has_dep_devices(vdev->vbasedev.name);
+
+ for (i = 0; i < info->count; i++) {
+ VFIOPCIDevice *tmp;
+
+ trace_iommufd_cdev_pci_hot_reset_dep_devices(devices[i].segment,
+ devices[i].bus,
+ PCI_SLOT(devices[i].devfn),
+ PCI_FUNC(devices[i].devfn),
+ devices[i].devid);
+
+ /*
+ * If a VFIO cdev device is resettable, all the dependent devices
+ * are either bound to same iommufd or within same iommu_groups as
+ * one of the iommufd bound devices.
+ */
+ assert(devices[i].devid != VFIO_PCI_DEVID_NOT_OWNED);
+
+ tmp = iommufd_cdev_dep_get_realized_vpdev(&devices[i], &vdev->vbasedev);
+ if (!tmp) {
+ continue;
+ }
+
+ if (single) {
+ ret = -EINVAL;
+ goto out_single;
+ }
+ vfio_pci_pre_reset(tmp);
+ tmp->vbasedev.needs_reset = false;
+ multi = true;
+ }
+
+ if (!single && !multi) {
+ ret = -EINVAL;
+ goto out_single;
+ }
+
+ /* Use zero length array for hot reset with iommufd backend */
+ reset = g_malloc0(sizeof(*reset));
+ reset->argsz = sizeof(*reset);
+
+ /* Bus reset! */
+ ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_PCI_HOT_RESET, reset);
+ g_free(reset);
+ if (ret) {
+ ret = -errno;
+ }
+
+ trace_vfio_pci_hot_reset_result(vdev->vbasedev.name,
+ ret ? strerror(errno) : "Success");
+
+ /* Re-enable INTx on affected devices */
+ for (i = 0; i < info->count; i++) {
+ VFIOPCIDevice *tmp;
+
+ tmp = iommufd_cdev_dep_get_realized_vpdev(&devices[i], &vdev->vbasedev);
+ if (!tmp) {
+ continue;
+ }
+ vfio_pci_post_reset(tmp);
+ }
+out_single:
+ if (!single) {
+ vfio_pci_post_reset(vdev);
+ }
+ g_free(info);
+
+ return ret;
+}
+
const VFIOIOMMUOps vfio_iommufd_ops = {
.dma_map = iommufd_cdev_map,
.dma_unmap = iommufd_cdev_unmap,
.attach_device = iommufd_cdev_attach,
.detach_device = iommufd_cdev_detach,
+ .pci_hot_reset = iommufd_cdev_pci_hot_reset,
};
diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
index 3340c93af0..8fdde54456 100644
--- a/hw/vfio/trace-events
+++ b/hw/vfio/trace-events
@@ -174,3 +174,4 @@ iommufd_cdev_detach_ioas_hwpt(int iommufd, const char *name) " [iommufd=%d] Succ
iommufd_cdev_fail_attach_existing_container(const char *msg) " %s"
iommufd_cdev_alloc_ioas(int iommufd, int ioas_id) " [iommufd=%d] new IOMMUFD container with ioasid=%d"
iommufd_cdev_device_info(char *name, int devfd, int num_irqs, int num_regions, int flags) " %s (%d) num_irqs=%d num_regions=%d flags=%d"
+iommufd_cdev_pci_hot_reset_dep_devices(int domain, int bus, int slot, int function, int dev_id) "\t%04x:%02x:%02x.%x devid %d"
--
2.39.3
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