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qemu.18973
0108-xen_backend-add-grant-table-helpers.patch
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File 0108-xen_backend-add-grant-table-helpers.patch of Package qemu.18973
From: Paul Durrant <paul.durrant@citrix.com> Date: Thu, 17 May 2018 16:35:51 +0100 Subject: xen_backend: add grant table helpers This patch adds grant table helper functions to the xen_backend code to localize error reporting and use of xen_domid. The patch also defers the call to xengnttab_open() until just before the initialise method in XenDevOps is invoked. This method is responsible for mapping the shared ring. No prior method requires access to the grant table. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Acked-by: Anthony PERARD <anthony.perard@citrix.com> Signed-off-by: Stefano Stabellini <sstabellini@kernel.org> (cherry picked from commit 9838824affced9e4db01a369dd28c14f694fa9b9) [LD: BSC#1100408] Signed-off-by: Larry Dewey <ldewey@suse.com> --- hw/xen/xen_backend.c | 123 +++++++++++++++++++++++++++++++---- include/hw/xen/xen_backend.h | 33 ++++++++++ 2 files changed, 144 insertions(+), 12 deletions(-) diff --git a/hw/xen/xen_backend.c b/hw/xen/xen_backend.c index 0f849a26d28f25fddd58c5cab3c3..62327194422aad57e5905f9f2488 100644 --- a/hw/xen/xen_backend.c +++ b/hw/xen/xen_backend.c @@ -106,6 +106,103 @@ int xen_be_set_state(struct XenDevice *xendev, enum xenbus_state state) return 0; } +void xen_be_set_max_grant_refs(struct XenDevice *xendev, + unsigned int nr_refs) +{ + assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV); + + if (xengnttab_set_max_grants(xendev->gnttabdev, nr_refs)) { + xen_pv_printf(xendev, 0, "xengnttab_set_max_grants failed: %s\n", + strerror(errno)); + } +} + +void *xen_be_map_grant_refs(struct XenDevice *xendev, uint32_t *refs, + unsigned int nr_refs, int prot) +{ + void *ptr; + + assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV); + + ptr = xengnttab_map_domain_grant_refs(xendev->gnttabdev, nr_refs, + xen_domid, refs, prot); + if (!ptr) { + xen_pv_printf(xendev, 0, + "xengnttab_map_domain_grant_refs failed: %s\n", + strerror(errno)); + } + + return ptr; +} + +void xen_be_unmap_grant_refs(struct XenDevice *xendev, void *ptr, + unsigned int nr_refs) +{ + assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV); + + if (xengnttab_unmap(xendev->gnttabdev, ptr, nr_refs)) { + xen_pv_printf(xendev, 0, "xengnttab_unmap failed: %s\n", + strerror(errno)); + } +} + +int xen_be_copy_grant_refs(struct XenDevice *xendev, + bool to_domain, + XenGrantCopySegment segs[], + unsigned int nr_segs) +{ + xengnttab_grant_copy_segment_t *xengnttab_segs; + unsigned int i; + int rc; + + assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV); + + xengnttab_segs = g_new0(xengnttab_grant_copy_segment_t, nr_segs); + + for (i = 0; i < nr_segs; i++) { + XenGrantCopySegment *seg = &segs[i]; + xengnttab_grant_copy_segment_t *xengnttab_seg = &xengnttab_segs[i]; + + if (to_domain) { + xengnttab_seg->flags = GNTCOPY_dest_gref; + xengnttab_seg->dest.foreign.domid = xen_domid; + xengnttab_seg->dest.foreign.ref = seg->dest.foreign.ref; + xengnttab_seg->dest.foreign.offset = seg->dest.foreign.offset; + xengnttab_seg->source.virt = seg->source.virt; + } else { + xengnttab_seg->flags = GNTCOPY_source_gref; + xengnttab_seg->source.foreign.domid = xen_domid; + xengnttab_seg->source.foreign.ref = seg->source.foreign.ref; + xengnttab_seg->source.foreign.offset = + seg->source.foreign.offset; + xengnttab_seg->dest.virt = seg->dest.virt; + } + + xengnttab_seg->len = seg->len; + } + + rc = xengnttab_grant_copy(xendev->gnttabdev, nr_segs, xengnttab_segs); + + if (rc) { + xen_pv_printf(xendev, 0, "xengnttab_copy failed: %s\n", + strerror(errno)); + } + + for (i = 0; i < nr_segs; i++) { + xengnttab_grant_copy_segment_t *xengnttab_seg = + &xengnttab_segs[i]; + + if (xengnttab_seg->status != GNTST_okay) { + xen_pv_printf(xendev, 0, "segment[%u] status: %d\n", i, + xengnttab_seg->status); + rc = -1; + } + } + + g_free(xengnttab_segs); + return rc; +} + /* * get xen backend device, allocate a new one if it doesn't exist. */ @@ -149,18 +246,6 @@ static struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev, } qemu_set_cloexec(xenevtchn_fd(xendev->evtchndev)); - if (ops->flags & DEVOPS_FLAG_NEED_GNTDEV) { - xendev->gnttabdev = xengnttab_open(NULL, 0); - if (xendev->gnttabdev == NULL) { - xen_pv_printf(NULL, 0, "can't open gnttab device\n"); - xenevtchn_close(xendev->evtchndev); - qdev_unplug(DEVICE(xendev), NULL); - return NULL; - } - } else { - xendev->gnttabdev = NULL; - } - xen_pv_insert_xendev(xendev); if (xendev->ops->alloc) { @@ -322,6 +407,16 @@ static int xen_be_try_initialise(struct XenDevice *xendev) } } + if (xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV) { + xendev->gnttabdev = xengnttab_open(NULL, 0); + if (xendev->gnttabdev == NULL) { + xen_pv_printf(NULL, 0, "can't open gnttab device\n"); + return -1; + } + } else { + xendev->gnttabdev = NULL; + } + if (xendev->ops->initialise) { rc = xendev->ops->initialise(xendev); } @@ -369,6 +464,10 @@ static void xen_be_disconnect(struct XenDevice *xendev, enum xenbus_state state) xendev->ops->disconnect) { xendev->ops->disconnect(xendev); } + if (xendev->gnttabdev) { + xengnttab_close(xendev->gnttabdev); + xendev->gnttabdev = NULL; + } if (xendev->be_state != state) { xen_be_set_state(xendev, state); } diff --git a/include/hw/xen/xen_backend.h b/include/hw/xen/xen_backend.h index 3a27692407979af5a22667d319b5..29bf1c3bc3fd77d9e882e4c32645 100644 --- a/include/hw/xen/xen_backend.h +++ b/include/hw/xen/xen_backend.h @@ -42,6 +42,39 @@ void xen_be_register_common(void); int xen_be_register(const char *type, struct XenDevOps *ops); int xen_be_set_state(struct XenDevice *xendev, enum xenbus_state state); int xen_be_bind_evtchn(struct XenDevice *xendev); +void xen_be_set_max_grant_refs(struct XenDevice *xendev, + unsigned int nr_refs); +void *xen_be_map_grant_refs(struct XenDevice *xendev, uint32_t *refs, + unsigned int nr_refs, int prot); +void xen_be_unmap_grant_refs(struct XenDevice *xendev, void *ptr, + unsigned int nr_refs); + +typedef struct XenGrantCopySegment { + union { + void *virt; + struct { + uint32_t ref; + off_t offset; + } foreign; + } source, dest; + size_t len; +} XenGrantCopySegment; + +int xen_be_copy_grant_refs(struct XenDevice *xendev, + bool to_domain, XenGrantCopySegment segs[], + unsigned int nr_segs); + +static inline void *xen_be_map_grant_ref(struct XenDevice *xendev, + uint32_t ref, int prot) +{ + return xen_be_map_grant_refs(xendev, &ref, 1, prot); +} + +static inline void xen_be_unmap_grant_ref(struct XenDevice *xendev, + void *ptr) +{ + return xen_be_unmap_grant_refs(xendev, ptr, 1); +} /* actual backend drivers */ extern struct XenDevOps xen_console_ops; /* xen_console.c */
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