Re: [PATCH] virtio: uapi: Drop __packed attribute in linux/virtio_pci.h:

[Suzuki K Poulose <suzuki.poulose@xxxxxxx>]

On 25/01/2024 22:48, Michael S. Tsirkin wrote:
> On Wed, Jan 24, 2024 at 05:23:45PM +0000, Suzuki K Poulose wrote:
> > Commit 92792ac752aa ("virtio-pci: Introduce admin command sending function")
> > added "__packed" structures to UAPI header linux/virtio_pci.h. This triggers
> > build failures in the consumer userspace applications without proper "definition"
> > of __packed (e.g., kvmtool build fails).
> >
> > Moreover, the structures are already packed well, and doesn't need explicit
> > packing, similar to the rest of the structures in all virtio_* headers. Remove
> > the __packed attribute.
> >
> > Fixes: commit 92792ac752aa ("virtio-pci: Introduce admin command sending function")
>
>
> Proper form is:
>
> Fixes: 92792ac752aa ("virtio-pci: Introduce admin command sending function")

Apologies, for messing that up.

> > Cc: Feng Liu <feliu@xxxxxxxxxx>
> > Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
> > Cc: Yishai Hadas <yishaih@xxxxxxxxxx>
> > Cc: Alex Williamson <alex.williamson@xxxxxxxxxx>
> > Cc: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>
> > Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
> > ---
> >   include/uapi/linux/virtio_pci.h | 10 +++++-----
> >   1 file changed, 5 insertions(+), 5 deletions(-)
> >
> > diff --git a/include/uapi/linux/virtio_pci.h b/include/uapi/linux/virtio_pci.h
> > index ef3810dee7ef..a8208492e822 100644
> > --- a/include/uapi/linux/virtio_pci.h
> > +++ b/include/uapi/linux/virtio_pci.h
> > @@ -240,7 +240,7 @@ struct virtio_pci_cfg_cap {
> >   #define VIRTIO_ADMIN_CMD_LEGACY_DEV_CFG_READ		0x5
> >   #define VIRTIO_ADMIN_CMD_LEGACY_NOTIFY_INFO		0x6
> >   
> > -struct __packed virtio_admin_cmd_hdr {
> > +struct virtio_admin_cmd_hdr {
> >   	__le16 opcode;
> >   	/*
> >   	 * 1 - SR-IOV
> > @@ -252,20 +252,20 @@ struct __packed virtio_admin_cmd_hdr {
> >   	__le64 group_member_id;
> >   };
> >   
> > -struct __packed virtio_admin_cmd_status {
> > +struct virtio_admin_cmd_status {
> >   	__le16 status;
> >   	__le16 status_qualifier;
> >   	/* Unused, reserved for future extensions. */
> >   	__u8 reserved2[4];
> >   };
> >   
> > -struct __packed virtio_admin_cmd_legacy_wr_data {
> > +struct virtio_admin_cmd_legacy_wr_data {
> >   	__u8 offset; /* Starting offset of the register(s) to write. */
> >   	__u8 reserved[7];
> >   	__u8 registers[];
> >   };
> >   
> > -struct __packed virtio_admin_cmd_legacy_rd_data {
> > +struct virtio_admin_cmd_legacy_rd_data {
> >   	__u8 offset; /* Starting offset of the register(s) to read. */
> >   };
> >   
> > @@ -275,7 +275,7 @@ struct __packed virtio_admin_cmd_legacy_rd_data {
> >   
> >   #define VIRTIO_ADMIN_CMD_MAX_NOTIFY_INFO 4
> >   
> > -struct __packed virtio_admin_cmd_notify_info_data {
> > +struct virtio_admin_cmd_notify_info_data {
> >   	__u8 flags; /* 0 = end of list, 1 = owner device, 2 = member device */
> >   	__u8 bar; /* BAR of the member or the owner device */
> >   	__u8 padding[6];
>
>
> Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
>
> I will queue this.

Thanks
Suzuki

> > --
> > 2.34.1