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xen/privcmd: Add new syscall to get gsi from dev

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On PVH dom0, when passthrough a device to domU, QEMU and xl tools
want to use gsi number to do pirq mapping, see QEMU code
xen_pt_realize->xc_physdev_map_pirq, and xl code
pci_add_dm_done->xc_physdev_map_pirq, but in current codes, the gsi
number is got from file /sys/bus/pci/devices/<sbdf>/irq, that is
wrong, because irq is not equal with gsi, they are in different
spaces, so pirq mapping fails.
And in current linux codes, there is no method to get gsi
for userspace.

For above purpose, record gsi of pcistub devices when init
pcistub and add a new syscall into privcmd to let userspace
can get gsi when they have a need.

Signed-off-by: Jiqian Chen <Jiqian.Chen@amd.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Jiqian Chen <Jiqian.Chen@amd.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Message-ID: <20240924061437.2636766-4-Jiqian.Chen@amd.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Jiqian Chen
2024-09-24 14:14:37 +08:00
committed by Juergen Gross
parent b166b8ab41
commit 2fae6bb7be
5 changed files with 84 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/uapi/xen/privcmd.h
+7
View File
@@ -126,6 +126,11 @@ struct privcmd_ioeventfd {
__u8 pad[2];
};
struct privcmd_pcidev_get_gsi {
__u32 sbdf;
__u32 gsi;
};
/*
* @cmd: IOCTL_PRIVCMD_HYPERCALL
* @arg: &privcmd_hypercall_t
@@ -157,5 +162,7 @@ struct privcmd_ioeventfd {
_IOW('P', 8, struct privcmd_irqfd)
#define IOCTL_PRIVCMD_IOEVENTFD \
_IOW('P', 9, struct privcmd_ioeventfd)
#define IOCTL_PRIVCMD_PCIDEV_GET_GSI \
_IOC(_IOC_NONE, 'P', 10, sizeof(struct privcmd_pcidev_get_gsi))
#endif /* __LINUX_PUBLIC_PRIVCMD_H__ */