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Re: [PATCH v3] xen: Remove dependency between pciback and privcmd
- To: Jiqian Chen <Jiqian.Chen@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Fri, 11 Oct 2024 14:06:14 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 11 Oct 2024 12:06:18 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.10.24 05:42, Jiqian Chen wrote:
Commit 2fae6bb7be32 ("xen/privcmd: Add new syscall to get gsi from dev")
adds a weak reverse dependency to the config XEN_PRIVCMD definition, that
dependency causes xen-privcmd can't be loaded on domU, because dependent
xen-pciback isn't always be loaded successfully on domU.
To solve above problem, remove that dependency, and do not call
pcistub_get_gsi_from_sbdf() directly, instead add a hook in
drivers/xen/apci.c, xen-pciback register the real call function, then in
privcmd_ioctl_pcidev_get_gsi call that hook.
Fixes: 2fae6bb7be32 ("xen/privcmd: Add new syscall to get gsi from dev")
Reported-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jiqian Chen <Jiqian.Chen@xxxxxxx>
Unfortunately I'm seeing a build breakage for the 32-bit x86 build.
Reason is that drivers/xen/acpi.c is being built for Dom0 only, so having
CONFIG_XEN_ACPI defined is not enough for ensuring the new functions are
present.
I suggest to add a new CONFIG item CONFIG_XEN_DOM0_ACPI like
config XEN_DOM0_ACPI
def_bool y
depends on XEN_ACPI && XEN_DOM0
and then replace all CONFIG_XEN_ACPI instances in your patch with
CONFIG_XEN_DOM0_ACPI. This includes the use case in
privcmd_ioctl_pcidev_get_gsi().
Juergen
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