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s390x/css: add s390-squash-mcss machine option

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We want to support real (i.e. not virtual) channel devices
even for guests that do not support MCSS-E (where guests may
see devices from any channel subsystem image at once). As all
virtio-ccw devices are in css 0xfe (and show up in the default
css 0 for guests not activating MCSS-E), we need an option to
squash both the virtio subchannels and e.g. passed-through
subchannels from their real css (0-3, or 0 for hosts not
activating MCSS-E) into the default css. This will be
exploited in a later patch.

Signed-off-by: Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Message-Id: <20170517004813.58227-4-bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Xiao Feng Ren 2017-05-17 02:48:03 +02:00 • committed by Cornelia Huck
parent 74c98e20a6
commit 274250c301
4 changed files with 37 additions and 1 deletions
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1
include/hw/s390x/s390-virtio-ccw.h
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@ -29,6 +29,7 @@ typedef struct S390CcwMachineState {
bool aes_key_wrap;
bool dea_key_wrap;
uint8_t loadparm[8];
bool s390_squash_mcss;
} S390CcwMachineState;
typedef struct S390CcwMachineClass {