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s390x/kvm: enable/reset cmma via vm attributes

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Exploit the new api for userspace-controlled cmma. If supported, enable
cmma during kvm initialization and register a reset handler for cmma,
which is also called directly from the load IPL code.

The reset functionality is needed to reset the cmma state of the guest
pages, e.g. if a system reset is triggered via qemu monitor; otherwise
this could result in data corruption.

A guest triggered reboot may now lead to multiple cmma resets; this is
OK, however, as this is slowpath anyway and the simplest way to achieve
the intended effects.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Dominik Dingel 2014-04-11 13:47:40 +02:00 • committed by Cornelia Huck
parent 08da527fd0
commit 4cb88c3c37
4 changed files with 76 additions and 0 deletions
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2
target-s390x/misc_helper.c
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@ -136,6 +136,7 @@ static int modified_clear_reset(S390CPU *cpu)
pause_all_vcpus();
cpu_synchronize_all_states();
cpu_full_reset_all();
cmma_reset(cpu);
io_subsystem_reset();
scc->load_normal(CPU(cpu));
cpu_synchronize_all_post_reset();
@ -150,6 +151,7 @@ static int load_normal_reset(S390CPU *cpu)
pause_all_vcpus();
cpu_synchronize_all_states();
cpu_reset_all();
cmma_reset(cpu);
io_subsystem_reset();
scc->initial_cpu_reset(CPU(cpu));
scc->load_normal(CPU(cpu));