Several PV drivers (both historically and currently [1]) report errors by writing text into /local/domain/$DOMID/error. This patch creates the node in libxl and makes it writable by the domain, and also adds some text into xenstore-paths.pandoc to state what the node is for.
[1] https://xenbits.xen.org/gitweb/?p=pvdrivers/win/xenvif.git;a=blob;f=src/xenvif/frontend.c;hb=HEAD#l459 Signed-off-by: Paul Durrant <pdurr...@amazon.com> --- Cc: Andrew Cooper <andrew.coop...@citrix.com> Cc: George Dunlap <george.dun...@citrix.com> Cc: Ian Jackson <ian.jack...@eu.citrix.com> Cc: Jan Beulich <jbeul...@suse.com> Cc: Julien Grall <jul...@xen.org> Cc: Konrad Rzeszutek Wilk <konrad.w...@oracle.com> Cc: Stefano Stabellini <sstabell...@kernel.org> Cc: Wei Liu <w...@xen.org> Cc: Anthony PERARD <anthony.per...@citrix.com> --- docs/misc/xenstore-paths.pandoc | 5 +++++ tools/libxl/libxl_create.c | 3 +++ 2 files changed, 8 insertions(+) diff --git a/docs/misc/xenstore-paths.pandoc b/docs/misc/xenstore-paths.pandoc index 0a6b36146e..e2ab5da54e 100644 --- a/docs/misc/xenstore-paths.pandoc +++ b/docs/misc/xenstore-paths.pandoc @@ -539,6 +539,11 @@ address written in one of these paths to, for example, establish a VNC session to the guest (although clearly some level of trust is placed in the value supplied by the guest in this case). +#### ~/error [w] + +A domain writable path used by some PV drivers to pass error messages +to the toolstack. + ### Paths private to the toolstack #### ~/device-model/$DOMID/state [w] diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c index ccc9e70990..27627cb199 100644 --- a/tools/libxl/libxl_create.c +++ b/tools/libxl/libxl_create.c @@ -797,6 +797,9 @@ retry_transaction: libxl__xs_mknod(gc, t, GCSPRINTF("%s/attr", dom_path), rwperm, ARRAY_SIZE(rwperm)); + libxl__xs_mknod(gc, t, + GCSPRINTF("%s/error", dom_path), + rwperm, ARRAY_SIZE(rwperm)); if (libxl_defbool_val(info->driver_domain)) { /* -- 2.20.1 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
