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| author | Daniel De Graaf <dgdegra@tycho.nsa.gov> | 2011-10-06 19:28:53 +0100 |
|---|---|---|
| committer | Daniel De Graaf <dgdegra@tycho.nsa.gov> | 2011-10-06 19:28:53 +0100 |
| commit | 1f5552006de96f879ea0bcf342dcf4d9b3b06354 (patch) | |
| tree | ea023d0ddf2f20b6590c98f49c83fa4fdb811064 /tools/libxc/xc_gnttab.c | |
| parent | b7ee8d2f432f726a1154d172016d3f2b22757fe3 (diff) | |
| download | xen-1f5552006de96f879ea0bcf342dcf4d9b3b06354.tar.gz xen-1f5552006de96f879ea0bcf342dcf4d9b3b06354.tar.bz2 xen-1f5552006de96f879ea0bcf342dcf4d9b3b06354.zip | |
libxc: add xc_gnttab_map_grant_ref_notify
Normally, when a userspace process mapping a grant crashes, the domain
providing the reference receives no indication that its peer has
crashed, possibly leading to unexpected freezes or timeouts. This
function provides a notification of the unmap by signalling an event
channel and/or clearing a specific byte in the page.
This also unifies the 3 very similar grant-mapping osdep interfaces into
a single function instead of introducing yet another minor variation.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Diffstat (limited to 'tools/libxc/xc_gnttab.c')
| -rw-r--r-- | tools/libxc/xc_gnttab.c | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/tools/libxc/xc_gnttab.c b/tools/libxc/xc_gnttab.c index 4f55fcef15..033cc5c0de 100644 --- a/tools/libxc/xc_gnttab.c +++ b/tools/libxc/xc_gnttab.c @@ -18,6 +18,7 @@ */ #include "xc_private.h" +#include <errno.h> int xc_gnttab_op(xc_interface *xch, int cmd, void * op, int op_size, int count) { @@ -150,8 +151,8 @@ void *xc_gnttab_map_grant_ref(xc_gnttab *xcg, uint32_t ref, int prot) { - return xcg->ops->u.gnttab.map_grant_ref(xcg, xcg->ops_handle, - domid, ref, prot); + return xcg->ops->u.gnttab.grant_map(xcg, xcg->ops_handle, 1, 0, prot, + &domid, &ref, -1, -1); } void *xc_gnttab_map_grant_refs(xc_gnttab *xcg, @@ -160,8 +161,8 @@ void *xc_gnttab_map_grant_refs(xc_gnttab *xcg, uint32_t *refs, int prot) { - return xcg->ops->u.gnttab.map_grant_refs(xcg, xcg->ops_handle, - count, domids, refs, prot); + return xcg->ops->u.gnttab.grant_map(xcg, xcg->ops_handle, count, 0, + prot, domids, refs, -1, -1); } void *xc_gnttab_map_domain_grant_refs(xc_gnttab *xcg, @@ -170,10 +171,23 @@ void *xc_gnttab_map_domain_grant_refs(xc_gnttab *xcg, uint32_t *refs, int prot) { - return xcg->ops->u.gnttab.map_domain_grant_refs(xcg, xcg->ops_handle, - count, domid, refs, prot); + return xcg->ops->u.gnttab.grant_map(xcg, xcg->ops_handle, count, + XC_GRANT_MAP_SINGLE_DOMAIN, + prot, &domid, refs, -1, -1); } +void *xc_gnttab_map_grant_ref_notify(xc_gnttab *xcg, + uint32_t domid, + uint32_t ref, + int prot, + uint32_t notify_offset, + evtchn_port_t notify_port) +{ + return xcg->ops->u.gnttab.grant_map(xcg, xcg->ops_handle, 1, 0, prot, + &domid, &ref, notify_offset, notify_port); +} + + int xc_gnttab_munmap(xc_gnttab *xcg, void *start_address, uint32_t count) |