From daa97513415525e4d17c4978f3c47a7b7e935b36 Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Tue, 21 Nov 2023 14:56:40 -0800 Subject: [PATCH] tools headers UAPI: Update tools's copy of vhost.h header tldr; Just FYI, I'm carrying this on the perf tools tree. Full explanation: There used to be no copies, with tools/ code using kernel headers directly. From time to time tools/perf/ broke due to legitimate kernel hacking. At some point Linus complained about such direct usage. Then we adopted the current model. The way these headers are used in perf are not restricted to just including them to compile something. There are sometimes used in scripts that convert defines into string tables, etc, so some change may break one of these scripts, or new MSRs may use some different #define pattern, etc. E.g.: $ ls -1 tools/perf/trace/beauty/*.sh | head -5 tools/perf/trace/beauty/arch_errno_names.sh tools/perf/trace/beauty/drm_ioctl.sh tools/perf/trace/beauty/fadvise.sh tools/perf/trace/beauty/fsconfig.sh tools/perf/trace/beauty/fsmount.sh $ $ tools/perf/trace/beauty/fadvise.sh static const char *fadvise_advices[] = { [0] = "NORMAL", [1] = "RANDOM", [2] = "SEQUENTIAL", [3] = "WILLNEED", [4] = "DONTNEED", [5] = "NOREUSE", }; $ The tools/perf/check-headers.sh script, part of the tools/ build process, points out changes in the original files. So its important not to touch the copies in tools/ when doing changes in the original kernel headers, that will be done later, when check-headers.sh inform about the change to the perf tools hackers. Cc: "Michael S. Tsirkin" Cc: Jason Wang Cc: kvm@vger.kernel.org Cc: virtualization@lists.linux.dev Cc: netdev@vger.kernel.org Signed-off-by: Namhyung Kim Link: https://lore.kernel.org/r/20231121225650.390246-5-namhyung@kernel.org --- tools/include/uapi/linux/vhost.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tools/include/uapi/linux/vhost.h b/tools/include/uapi/linux/vhost.h index f5c48b61ab62..649560c685f1 100644 --- a/tools/include/uapi/linux/vhost.h +++ b/tools/include/uapi/linux/vhost.h @@ -219,4 +219,12 @@ */ #define VHOST_VDPA_RESUME _IO(VHOST_VIRTIO, 0x7E) +/* Get the group for the descriptor table including driver & device areas + * of a virtqueue: read index, write group in num. + * The virtqueue index is stored in the index field of vhost_vring_state. + * The group ID of the descriptor table for this specific virtqueue + * is returned via num field of vhost_vring_state. + */ +#define VHOST_VDPA_GET_VRING_DESC_GROUP _IOWR(VHOST_VIRTIO, 0x7F, \ + struct vhost_vring_state) #endif