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[PULL 09/16] vfio: Implement a common device info helper
From: |
Cédric Le Goater |
Subject: |
[PULL 09/16] vfio: Implement a common device info helper |
Date: |
Fri, 30 Jun 2023 07:22:28 +0200 |
From: Alex Williamson <alex.williamson@redhat.com>
A common helper implementing the realloc algorithm for handling
capabilities.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Robin Voetter <robin@streamhpc.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
---
include/hw/vfio/vfio-common.h | 1 +
hw/s390x/s390-pci-vfio.c | 37 ++++------------------------
hw/vfio/common.c | 46 ++++++++++++++++++++++++++---------
3 files changed, 41 insertions(+), 43 deletions(-)
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 3dc5f2104c86..6d1b8487c374 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -216,6 +216,7 @@ void vfio_region_finalize(VFIORegion *region);
void vfio_reset_handler(void *opaque);
VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp);
void vfio_put_group(VFIOGroup *group);
+struct vfio_device_info *vfio_get_device_info(int fd);
int vfio_get_device(VFIOGroup *group, const char *name,
VFIODevice *vbasedev, Error **errp);
diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c
index f51190d4662f..59a2e03873bd 100644
--- a/hw/s390x/s390-pci-vfio.c
+++ b/hw/s390x/s390-pci-vfio.c
@@ -289,38 +289,11 @@ static void s390_pci_read_pfip(S390PCIBusDevice *pbdev,
memcpy(pbdev->zpci_fn.pfip, cap->pfip, CLP_PFIP_NR_SEGMENTS);
}
-static struct vfio_device_info *get_device_info(S390PCIBusDevice *pbdev,
- uint32_t argsz)
+static struct vfio_device_info *get_device_info(S390PCIBusDevice *pbdev)
{
- struct vfio_device_info *info = g_malloc0(argsz);
- VFIOPCIDevice *vfio_pci;
- int fd;
+ VFIOPCIDevice *vfio_pci = container_of(pbdev->pdev, VFIOPCIDevice, pdev);
- vfio_pci = container_of(pbdev->pdev, VFIOPCIDevice, pdev);
- fd = vfio_pci->vbasedev.fd;
-
- /*
- * If the specified argsz is not large enough to contain all capabilities
- * it will be updated upon return from the ioctl. Retry until we have
- * a big enough buffer to hold the entire capability chain. On error,
- * just exit and rely on CLP defaults.
- */
-retry:
- info->argsz = argsz;
-
- if (ioctl(fd, VFIO_DEVICE_GET_INFO, info)) {
- trace_s390_pci_clp_dev_info(vfio_pci->vbasedev.name);
- g_free(info);
- return NULL;
- }
-
- if (info->argsz > argsz) {
- argsz = info->argsz;
- info = g_realloc(info, argsz);
- goto retry;
- }
-
- return info;
+ return vfio_get_device_info(vfio_pci->vbasedev.fd);
}
/*
@@ -335,7 +308,7 @@ bool s390_pci_get_host_fh(S390PCIBusDevice *pbdev, uint32_t
*fh)
assert(fh);
- info = get_device_info(pbdev, sizeof(*info));
+ info = get_device_info(pbdev);
if (!info) {
return false;
}
@@ -356,7 +329,7 @@ void s390_pci_get_clp_info(S390PCIBusDevice *pbdev)
{
g_autofree struct vfio_device_info *info = NULL;
- info = get_device_info(pbdev, sizeof(*info));
+ info = get_device_info(pbdev);
if (!info) {
return;
}
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 25801de173c4..28ec9e999c09 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -2846,11 +2846,35 @@ void vfio_put_group(VFIOGroup *group)
}
}
+struct vfio_device_info *vfio_get_device_info(int fd)
+{
+ struct vfio_device_info *info;
+ uint32_t argsz = sizeof(*info);
+
+ info = g_malloc0(argsz);
+
+retry:
+ info->argsz = argsz;
+
+ if (ioctl(fd, VFIO_DEVICE_GET_INFO, info)) {
+ g_free(info);
+ return NULL;
+ }
+
+ if (info->argsz > argsz) {
+ argsz = info->argsz;
+ info = g_realloc(info, argsz);
+ goto retry;
+ }
+
+ return info;
+}
+
int vfio_get_device(VFIOGroup *group, const char *name,
VFIODevice *vbasedev, Error **errp)
{
- struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) };
- int ret, fd;
+ g_autofree struct vfio_device_info *info = NULL;
+ int fd;
fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
if (fd < 0) {
@@ -2862,11 +2886,11 @@ int vfio_get_device(VFIOGroup *group, const char *name,
return fd;
}
- ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info);
- if (ret) {
+ info = vfio_get_device_info(fd);
+ if (!info) {
error_setg_errno(errp, errno, "error getting device info");
close(fd);
- return ret;
+ return -1;
}
/*
@@ -2894,14 +2918,14 @@ int vfio_get_device(VFIOGroup *group, const char *name,
vbasedev->group = group;
QLIST_INSERT_HEAD(&group->device_list, vbasedev, next);
- vbasedev->num_irqs = dev_info.num_irqs;
- vbasedev->num_regions = dev_info.num_regions;
- vbasedev->flags = dev_info.flags;
+ vbasedev->num_irqs = info->num_irqs;
+ vbasedev->num_regions = info->num_regions;
+ vbasedev->flags = info->flags;
+
+ trace_vfio_get_device(name, info->flags, info->num_regions,
info->num_irqs);
- trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions,
- dev_info.num_irqs);
+ vbasedev->reset_works = !!(info->flags & VFIO_DEVICE_FLAGS_RESET);
- vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
return 0;
}
--
2.41.0
- [PULL 02/16] migration: Implement switchover ack logic, (continued)
- [PULL 02/16] migration: Implement switchover ack logic, Cédric Le Goater, 2023/06/30
- [PULL 05/16] vfio/migration: Refactor vfio_save_block() to return saved data size, Cédric Le Goater, 2023/06/30
- [PULL 06/16] vfio/migration: Store VFIO migration flags in VFIOMigration, Cédric Le Goater, 2023/06/30
- [PULL 04/16] tests: Add migration switchover ack capability test, Cédric Le Goater, 2023/06/30
- [PULL 07/16] vfio/migration: Add VFIO migration pre-copy support, Cédric Le Goater, 2023/06/30
- [PULL 08/16] vfio/migration: Add support for switchover ack capability, Cédric Le Goater, 2023/06/30
- [PULL 14/16] MAINTAINERS: Promote Cédric to VFIO co-maintainer, Cédric Le Goater, 2023/06/30
- [PULL 10/16] hw/vfio/pci-quirks: Support alternate offset for GPUDirect Cliques, Cédric Le Goater, 2023/06/30
- [PULL 11/16] vfio/pci: Call vfio_prepare_kvm_msi_virq_batch() in MSI retry path, Cédric Le Goater, 2023/06/30
- [PULL 09/16] vfio: Implement a common device info helper,
Cédric Le Goater <=
- [PULL 12/16] vfio/migration: Reset bytes_transferred properly, Cédric Le Goater, 2023/06/30
- [PULL 13/16] vfio/migration: Make VFIO migration non-experimental, Cédric Le Goater, 2023/06/30
- [PULL 15/16] vfio/pci: Fix a segfault in vfio_realize, Cédric Le Goater, 2023/06/30
- [PULL 16/16] vfio/pci: Free leaked timer in vfio_realize error path, Cédric Le Goater, 2023/06/30
- Re: [PULL 00/16] vfio queue, Richard Henderson, 2023/06/30