On 02/09/2022 19.27, Matthew Rosato wrote:
In order to interface with the underlying host zPCI device, we need
to know it's function handle. Add a routine to grab this from the
Nit: s/it's/its/
vfio CLP capabilities chain.
Reviewed-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
Signed-off-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxx>
---
hw/s390x/s390-pci-vfio.c | 83 ++++++++++++++++++++++++++------
include/hw/s390x/s390-pci-vfio.h | 5 ++
2 files changed, 72 insertions(+), 16 deletions(-)
diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c
index 6f80a47e29..4bf0a7e22d 100644
--- a/hw/s390x/s390-pci-vfio.c
+++ b/hw/s390x/s390-pci-vfio.c
@@ -124,6 +124,27 @@ static void s390_pci_read_base(S390PCIBusDevice *pbdev,
pbdev->zpci_fn.pft = 0;
}
+static bool get_host_fh(S390PCIBusDevice *pbdev, struct vfio_device_info *info,
+ uint32_t *fh)
+{
+ struct vfio_info_cap_header *hdr;
+ struct vfio_device_info_cap_zpci_base *cap;
+ VFIOPCIDevice *vpci = container_of(pbdev->pdev, VFIOPCIDevice, pdev);
Nit: two spaces after the "="
+ hdr = vfio_get_device_info_cap(info, VFIO_DEVICE_INFO_CAP_ZPCI_BASE);
+
+ /* Can only get the host fh with version 2 or greater */
+ if (hdr == NULL || hdr->version < 2) {
+ trace_s390_pci_clp_cap(vpci->vbasedev.name,
+ VFIO_DEVICE_INFO_CAP_ZPCI_BASE);
+ return false;
+ }
+ cap = (void *) hdr;
+
+ *fh = cap->fh;
+ return true;
+}
+
static void s390_pci_read_group(S390PCIBusDevice *pbdev,
struct vfio_device_info *info)
{
@@ -217,25 +238,13 @@ static void s390_pci_read_pfip(S390PCIBusDevice *pbdev,
memcpy(pbdev->zpci_fn.pfip, cap->pfip, CLP_PFIP_NR_SEGMENTS);
}
-/*
- * This function will issue the VFIO_DEVICE_GET_INFO ioctl and look for
- * capabilities that contain information about CLP features provided by the
- * underlying host.
- * On entry, defaults have already been placed into the guest CLP response
- * buffers. On exit, defaults will have been overwritten for any CLP features
- * found in the capability chain; defaults will remain for any CLP features not
- * found in the chain.
- */
-void s390_pci_get_clp_info(S390PCIBusDevice *pbdev)
+static struct vfio_device_info *get_device_info(S390PCIBusDevice *pbdev,
+ uint32_t argsz)
{
- g_autofree struct vfio_device_info *info = NULL;
+ struct vfio_device_info *info = g_malloc0(argsz);
VFIOPCIDevice *vfio_pci;
- uint32_t argsz;
int fd;
- argsz = sizeof(*info);
- info = g_malloc0(argsz);
-
vfio_pci = container_of(pbdev->pdev, VFIOPCIDevice, pdev);
fd = vfio_pci->vbasedev.fd;
@@ -250,7 +259,8 @@ retry:
if (ioctl(fd, VFIO_DEVICE_GET_INFO, info)) {
trace_s390_pci_clp_dev_info(vfio_pci->vbasedev.name);
- return;
+ free(info);
Nit: Please use g_free() for things that you've allocated with g_malloc0().
+ return NULL;
}
if (info->argsz > argsz) {
@@ -259,6 +269,47 @@ retry:
goto retry;
}
+ return info;
+}
...
Apart from the nits, the patch looks fine to me.
Thomas