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authorLinus Torvalds <torvalds@linux-foundation.org>2022-05-24 06:49:45 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-05-24 06:49:45 +0300
commitd61306047533eb6f63a7bd51dfa7f868503bf0ba (patch)
tree1f1e905249b81474fcb465b4d461ccb0beea8134 /sound
parent8443516da676be839b54ee11350baa2605f0a445 (diff)
parent5b3353949e89d48b4faf54a9cc241ee5d70df615 (diff)
downloadlinux-d61306047533eb6f63a7bd51dfa7f868503bf0ba.tar.xz
Merge tag 'for-linus-5.19-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen updates from Juergen Gross: - decouple the PV interface from kernel internals in the Xen scsifront/scsiback pv drivers - harden the Xen scsifront PV driver against a malicious backend driver - simplify Xen PV frontend driver ring page setup - support Xen setups with multiple domains created at boot time to tolerate Xenstore coming up late - two small cleanup patches * tag 'for-linus-5.19-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: (29 commits) xen: add support for initializing xenstore later as HVM domain xen: sync xs_wire.h header with upstream xen x86: xen: remove STACK_FRAME_NON_STANDARD from xen_cpuid xen-blk{back,front}: Update contact points for buffer_squeeze_duration_ms and feature_persistent xen/xenbus: eliminate xenbus_grant_ring() xen/sndfront: use xenbus_setup_ring() and xenbus_teardown_ring() xen/usbfront: use xenbus_setup_ring() and xenbus_teardown_ring() xen/scsifront: use xenbus_setup_ring() and xenbus_teardown_ring() xen/pcifront: use xenbus_setup_ring() and xenbus_teardown_ring() xen/drmfront: use xenbus_setup_ring() and xenbus_teardown_ring() xen/tpmfront: use xenbus_setup_ring() and xenbus_teardown_ring() xen/netfront: use xenbus_setup_ring() and xenbus_teardown_ring() xen/blkfront: use xenbus_setup_ring() and xenbus_teardown_ring() xen/xenbus: add xenbus_setup_ring() service function xen: update ring.h xen/shbuf: switch xen-front-pgdir-shbuf to use INVALID_GRANT_REF xen/dmabuf: switch gntdev-dmabuf to use INVALID_GRANT_REF xen/sound: switch xen_snd_front to use INVALID_GRANT_REF xen/drm: switch xen_drm_front to use INVALID_GRANT_REF xen/usb: switch xen-hcd to use INVALID_GRANT_REF ...
Diffstat (limited to 'sound')
-rw-r--r--sound/xen/xen_snd_front_evtchnl.c44
-rw-r--r--sound/xen/xen_snd_front_evtchnl.h9
2 files changed, 10 insertions, 43 deletions
diff --git a/sound/xen/xen_snd_front_evtchnl.c b/sound/xen/xen_snd_front_evtchnl.c
index ecbc294fc59a..26d1b3987887 100644
--- a/sound/xen/xen_snd_front_evtchnl.c
+++ b/sound/xen/xen_snd_front_evtchnl.c
@@ -143,12 +143,12 @@ void xen_snd_front_evtchnl_flush(struct xen_snd_front_evtchnl *channel)
static void evtchnl_free(struct xen_snd_front_info *front_info,
struct xen_snd_front_evtchnl *channel)
{
- unsigned long page = 0;
+ void *page = NULL;
if (channel->type == EVTCHNL_TYPE_REQ)
- page = (unsigned long)channel->u.req.ring.sring;
+ page = channel->u.req.ring.sring;
else if (channel->type == EVTCHNL_TYPE_EVT)
- page = (unsigned long)channel->u.evt.page;
+ page = channel->u.evt.page;
if (!page)
return;
@@ -167,10 +167,7 @@ static void evtchnl_free(struct xen_snd_front_info *front_info,
xenbus_free_evtchn(front_info->xb_dev, channel->port);
/* End access and free the page. */
- if (channel->gref != GRANT_INVALID_REF)
- gnttab_end_foreign_access(channel->gref, page);
- else
- free_page(page);
+ xenbus_teardown_ring(&page, 1, &channel->gref);
memset(channel, 0, sizeof(*channel));
}
@@ -196,8 +193,7 @@ static int evtchnl_alloc(struct xen_snd_front_info *front_info, int index,
enum xen_snd_front_evtchnl_type type)
{
struct xenbus_device *xb_dev = front_info->xb_dev;
- unsigned long page;
- grant_ref_t gref;
+ void *page;
irq_handler_t handler;
char *handler_name = NULL;
int ret;
@@ -207,12 +203,9 @@ static int evtchnl_alloc(struct xen_snd_front_info *front_info, int index,
channel->index = index;
channel->front_info = front_info;
channel->state = EVTCHNL_STATE_DISCONNECTED;
- channel->gref = GRANT_INVALID_REF;
- page = get_zeroed_page(GFP_KERNEL);
- if (!page) {
- ret = -ENOMEM;
+ ret = xenbus_setup_ring(xb_dev, GFP_KERNEL, &page, 1, &channel->gref);
+ if (ret)
goto fail;
- }
handler_name = kasprintf(GFP_KERNEL, "%s-%s", XENSND_DRIVER_NAME,
type == EVTCHNL_TYPE_REQ ?
@@ -226,33 +219,18 @@ static int evtchnl_alloc(struct xen_snd_front_info *front_info, int index,
mutex_init(&channel->ring_io_lock);
if (type == EVTCHNL_TYPE_REQ) {
- struct xen_sndif_sring *sring = (struct xen_sndif_sring *)page;
+ struct xen_sndif_sring *sring = page;
init_completion(&channel->u.req.completion);
mutex_init(&channel->u.req.req_io_lock);
- SHARED_RING_INIT(sring);
- FRONT_RING_INIT(&channel->u.req.ring, sring, XEN_PAGE_SIZE);
-
- ret = xenbus_grant_ring(xb_dev, sring, 1, &gref);
- if (ret < 0) {
- channel->u.req.ring.sring = NULL;
- goto fail;
- }
+ XEN_FRONT_RING_INIT(&channel->u.req.ring, sring, XEN_PAGE_SIZE);
handler = evtchnl_interrupt_req;
} else {
- ret = gnttab_grant_foreign_access(xb_dev->otherend_id,
- virt_to_gfn((void *)page), 0);
- if (ret < 0)
- goto fail;
-
- channel->u.evt.page = (struct xensnd_event_page *)page;
- gref = ret;
+ channel->u.evt.page = page;
handler = evtchnl_interrupt_evt;
}
- channel->gref = gref;
-
ret = xenbus_alloc_evtchn(xb_dev, &channel->port);
if (ret < 0)
goto fail;
@@ -279,8 +257,6 @@ static int evtchnl_alloc(struct xen_snd_front_info *front_info, int index,
return 0;
fail:
- if (page)
- free_page(page);
kfree(handler_name);
dev_err(&xb_dev->dev, "Failed to allocate ring: %d\n", ret);
return ret;
diff --git a/sound/xen/xen_snd_front_evtchnl.h b/sound/xen/xen_snd_front_evtchnl.h
index cbe51fd1ec15..3675fba70564 100644
--- a/sound/xen/xen_snd_front_evtchnl.h
+++ b/sound/xen/xen_snd_front_evtchnl.h
@@ -15,15 +15,6 @@
struct xen_snd_front_info;
-#ifndef GRANT_INVALID_REF
-/*
- * FIXME: usage of grant reference 0 as invalid grant reference:
- * grant reference 0 is valid, but never exposed to a PV driver,
- * because of the fact it is already in use/reserved by the PV console.
- */
-#define GRANT_INVALID_REF 0
-#endif
-
/* Timeout in ms to wait for backend to respond. */
#define VSND_WAIT_BACK_MS 3000