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| author | Jiqian Chen <Jiqian.Chen@amd.com> | 2024-09-24 14:14:37 +0800 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2024-09-25 09:54:55 +0200 |
| commit | 2fae6bb7be320270801b3c3b040189bd7daa8056 (patch) | |
| tree | 764fe8161bd288ffe4855e98e878f78944e0a4cc /drivers/xen/Kconfig | |
| parent | b166b8ab4189743a717cb93f50d6fcca3a46770d (diff) | |
| download | lwn-2fae6bb7be320270801b3c3b040189bd7daa8056.tar.gz lwn-2fae6bb7be320270801b3c3b040189bd7daa8056.zip | |
xen/privcmd: Add new syscall to get gsi from dev
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>
Diffstat (limited to 'drivers/xen/Kconfig')
| -rw-r--r-- | drivers/xen/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig index d5989871dd5d..fd83d51df2f4 100644 --- a/drivers/xen/Kconfig +++ b/drivers/xen/Kconfig @@ -261,6 +261,7 @@ config XEN_SCSI_BACKEND config XEN_PRIVCMD tristate "Xen hypercall passthrough driver" depends on XEN + imply CONFIG_XEN_PCIDEV_BACKEND default m help The hypercall passthrough driver allows privileged user programs to |