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qemu-kvm/SOURCES/kvm-vfio-Implement-a-common...

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From f68e8c5d841cd7fc785cc3d15b3c280211bfb4c3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@redhat.com>
Date: Wed, 12 Jul 2023 17:46:57 +0200
Subject: [PATCH 17/37] vfio: Implement a common device info helper
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Cédric Le Goater <clg@redhat.com>
RH-MergeRequest: 179: vfio: live migration support
RH-Bugzilla: 2192818
RH-Acked-by: Eric Auger <eric.auger@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [15/28] 9cfd233ab1b95dc7de776e8ef901823bd37c5a6b (clegoate/qemu-kvm-c9s)
Bugzilla: https://bugzilla.redhat.com/2192818
commit 634f38f0f73f
Author: Alex Williamson <alex.williamson@redhat.com>
Date: Thu Jun 1 08:45:06 2023 -0600
vfio: Implement a common device info helper
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>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
---
hw/s390x/s390-pci-vfio.c | 37 ++++------------------------
hw/vfio/common.c | 46 ++++++++++++++++++++++++++---------
include/hw/vfio/vfio-common.h | 1 +
3 files changed, 41 insertions(+), 43 deletions(-)
diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c
index f51190d466..59a2e03873 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 b73086e17a..3b4ac53f15 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -2845,11 +2845,35 @@ 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) {
@@ -2861,11 +2885,11 @@ 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;
}
/*
@@ -2893,14 +2917,14 @@ 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;
}
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 3dc5f2104c..6d1b8487c3 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);
--
2.39.3
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