kernel/linux.git/include/xen/interface/io/ring.h, branch linux-4.4.y

xen: sync include/xen/interface/io/ring.h with Xen's newest version

2021-12-08T07:44:06+00:00

commit 629a5d87e26fe96bcaab44cbb81f5866af6f7008 upstream. Sync include/xen/interface/io/ring.h with Xen's newest version in order to get the RING_COPY_RESPONSE() and RING_RESPONSE_PROD_OVERFLOW() macros. Signed-off-by: Juergen Gross Signed-off-by: Greg Kroah-Hartman

xen: Add RING_COPY_REQUEST()

2015-12-18T15:00:17+00:00

Using RING_GET_REQUEST() on a shared ring is easy to use incorrectly (i.e., by not considering that the other end may alter the data in the shared ring while it is being inspected). Safe usage of a request generally requires taking a local copy. Provide a RING_COPY_REQUEST() macro to use instead of RING_GET_REQUEST() and an open-coded memcpy(). This takes care of ensuring that the copy is done correctly regardless of any possible compiler optimizations. Use a volatile source to prevent the compiler from reordering or omitting the copy. This is part of XSA155. CC: stable@vger.kernel.org Signed-off-by: David Vrabel Signed-off-by: Konrad Rzeszutek Wilk

xen/io/ring.h: new macro to detect whether there are too many requests on the ring

2013-06-17T19:17:15+00:00

Backends may need to protect themselves against an insane number of produced requests stored by a frontend, in case they iterate over requests until reaching the req_prod value. There can't be more requests on the ring than the difference between produced requests and produced (but possibly not yet published) responses. This is a more strict alternative to a patch previously posted by Konrad Rzeszutek Wilk . Signed-off-by: Jan Beulich Signed-off-by: Konrad Rzeszutek Wilk

xen: Provide a variant of __RING_SIZE() that is an integer constant expression

2010-12-15T20:34:28+00:00

Without this, gcc 4.5 won't compile xen-netfront and xen-blkfront, where this is being used to specify array sizes. Signed-off-by: Jan Beulich Signed-off-by: Jeremy Fitzhardinge Cc: Jens Axboe Cc: David Miller Cc: Stable Kernel Signed-off-by: Linus Torvalds

xen: Add Xen interface header files

2007-07-18T15:47:42+00:00

Add Xen interface header files. These are taken fairly directly from the Xen tree, but somewhat rearranged to suit the kernel's conventions. Define macros and inline functions for doing hypercalls into the hypervisor. Signed-off-by: Jeremy Fitzhardinge Signed-off-by: Ian Pratt Signed-off-by: Christian Limpach Signed-off-by: Chris Wright