linux

iv/linux

History

Claudio Imbrenda b108f7f0a2 KVM: s390: pv: handle secure storage exceptions for normal guests

With upcoming patches, normal guests might touch secure pages.

This patch extends the existing exception handler to convert the pages
to non secure also when the exception is triggered by a normal guest.

This can happen for example when a secure guest reboots; the first
stage of a secure guest is non secure, and in general a secure guest
can reboot into non-secure mode.

If the secure memory of the previous boot has not been cleared up
completely yet (which will be allowed to happen in an upcoming patch),
a non-secure guest might touch secure memory, which will need to be
handled properly.

This means that gmap faults must be handled and not cause termination
of the process. The handling is the same as userspace accesses, it's
enough to translate the gmap address to a user address and then let the
normal user fault code handle it.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20220628135619.32410-4-imbrenda@linux.ibm.com
Message-Id: <20220628135619.32410-4-imbrenda@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>

2022-07-13 14:42:11 +00:00

cmm.c

s390/cmm: add missing virt_to_phys() conversion

2021-12-10 16:14:25 +01:00

dump_pagetables.c

s390: add support for BEAR enhancement facility

2021-10-26 15:21:29 +02:00

extable.c

s390/uaccess: use exception handler to zero result on get_user() failure

2022-06-01 12:03:17 +02:00

extmem.c

s390/extmem: remove stale -ENOSPC comment and handling