On 4/4/22 20:17, 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 vfio CLP capabilities chain. Signed-off-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxx>
Reviewed-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
--- hw/s390x/s390-pci-vfio.c | 83 ++++++++++++++++++++++++++------ include/hw/s390x/s390-pci-vfio.h | 6 +++ 2 files changed, 73 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); + + 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); + return NULL; }if (info->argsz > argsz) {@@ -259,6 +269,47 @@ retry: goto retry; }+ return info;+} + +/* + * Get the host function handle from the vfio CLP capabilities chain. Returns + * true if a fh value was placed into the provided buffer. Returns false + * if a fh could not be obtained (ioctl failed or capabilitiy version does + * not include the fh) + */ +bool s390_pci_get_host_fh(S390PCIBusDevice *pbdev, uint32_t *fh) +{ + g_autofree struct vfio_device_info *info = NULL; + + assert(fh); + + info = get_device_info(pbdev, sizeof(*info)); + if (!info) { + return false; + } + + return get_host_fh(pbdev, info, fh); +} + +/* + * 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) +{ + g_autofree struct vfio_device_info *info = NULL; + + info = get_device_info(pbdev, sizeof(*info)); + if (!info) { + return; + } + /* * Find the CLP features provided and fill in the guest CLP responses. * Always call s390_pci_read_base first as information from this could diff --git a/include/hw/s390x/s390-pci-vfio.h b/include/hw/s390x/s390-pci-vfio.h index ff708aef50..0c2e4b5175 100644 --- a/include/hw/s390x/s390-pci-vfio.h +++ b/include/hw/s390x/s390-pci-vfio.h @@ -20,6 +20,7 @@ bool s390_pci_update_dma_avail(int fd, unsigned int *avail); S390PCIDMACount *s390_pci_start_dma_count(S390pciState *s, S390PCIBusDevice *pbdev); void s390_pci_end_dma_count(S390pciState *s, S390PCIDMACount *cnt); +bool s390_pci_get_host_fh(S390PCIBusDevice *pbdev, uint32_t *fh); void s390_pci_get_clp_info(S390PCIBusDevice *pbdev); #else static inline bool s390_pci_update_dma_avail(int fd, unsigned int *avail) @@ -33,6 +34,11 @@ static inline S390PCIDMACount *s390_pci_start_dma_count(S390pciState *s, } static inline void s390_pci_end_dma_count(S390pciState *s, S390PCIDMACount *cnt) { } +static inline bool s390_pci_get_host_fh(S390PCIBusDevice *pbdev, + unsigned int *fh) +{ + return false; +} static inline void s390_pci_get_clp_info(S390PCIBusDevice *pbdev) { } #endif
-- Pierre Morel IBM Lab Boeblingen
