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KVM: s390: gs support for kvm guests

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This patch adds guarded storage support for KVM guest. We need to
setup the necessary control blocks, the kvm_run structure for the
new registers, the necessary wrappers for VSIE, as well as the
machine check save areas.
GS is enabled lazily and the register saving and reloading is done in
KVM code.  As this feature adds new content for migration, we provide
a new capability for enablement (KVM_CAP_S390_GS).

Signed-off-by: Fan Zhang <[email protected]>
Reviewed-by: Christian Borntraeger <[email protected]>
Reviewed-by: Janosch Frank <[email protected]>
Signed-off-by: Christian Borntraeger <[email protected]>
This commit is contained in:
Fan Zhang 2016-11-29 07:17:55 +01:00 • committed by Christian Borntraeger
commit 4e0b1ab72b
10 changed files with 191 additions and 4 deletions
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9
Documentation/virtual/kvm/api.txt
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@ -4101,6 +4101,15 @@ to take care of that.
This capability can be enabled dynamically even if VCPUs were already
created and are running.
7.9 KVM_CAP_S390_GS
Architectures: s390
Parameters: none
Returns: 0 on success; -EINVAL if the machine does not support
guarded storage; -EBUSY if a VCPU has already been created.
Allows use of guarded storage for the KVM guest.
8. Other capabilities.
----------------------