Revision 1457d8cf7664f34c4ba534c1073821a559a2f6f9 authored by Juergen Gross on 07 November 2018, 17:01:00 UTC, committed by Juergen Gross on 09 November 2018, 07:16:55 UTC
Commit 9da3f2b7405440 ("x86/fault: BUG() when uaccess helpers fault on
kernel addresses") introduced a regression for booting Xen PV guests.

Xen PV guests are using __put_user() and __get_user() for accessing the
p2m map (physical to machine frame number map) as accesses might fail
in case of not populated areas of the map.

With above commit using __put_user() and __get_user() for accessing
kernel pages is no longer valid. So replace the Xen hack by adding
appropriate p2m access functions using the default fixup handler.

Fixes: 9da3f2b7405440 ("x86/fault: BUG() when uaccess helpers fault on kernel addresses")
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
1 parent 6cc4a08
History
File Mode Size
Makefile -rw-r--r-- 361 bytes
compat.c -rw-r--r-- 2.2 KB
ipc_sysctl.c -rw-r--r-- 5.4 KB
mq_sysctl.c -rw-r--r-- 2.9 KB
mqueue.c -rw-r--r-- 39.0 KB
msg.c -rw-r--r-- 29.9 KB
msgutil.c -rw-r--r-- 3.6 KB
namespace.c -rw-r--r-- 4.6 KB
sem.c -rw-r--r-- 61.4 KB
shm.c -rw-r--r-- 42.4 KB
syscall.c -rw-r--r-- 4.7 KB
util.c -rw-r--r-- 22.1 KB
util.h -rw-r--r-- 8.8 KB

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