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KVM: s390: introduce post handlers for STSI

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The Store System Information (STSI) instruction currently collects all
information it relays to the caller in the kernel. Some information,
however, is only available in user space. An example of this is the
guest name: The kernel always sets "KVMGuest", but user space knows the
actual guest name.

This patch introduces a new exit, KVM_EXIT_S390_STSI, guarded by a
capability that can be enabled by user space if it wants to be able to
insert such data. User space will be provided with the target buffer
and the requested STSI function code.

Reviewed-by: Eric Farman <[email protected]>
Reviewed-by: Christian Borntraeger <[email protected]>
Signed-off-by: Ekaterina Tumanova <[email protected]>
Signed-off-by: Christian Borntraeger <[email protected]>
This commit is contained in:
Ekaterina Tumanova 2015-01-30 16:55:56 +01:00 • committed by Christian Borntraeger
commit e44fc8c9da
5 changed files with 61 additions and 1 deletions
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28
Documentation/virtual/kvm/api.txt
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@ -3304,3 +3304,31 @@ Returns: 0 on success, negative value on error
Allows use of the vector registers introduced with z13 processor, and
provides for the synchronization between host and user space. Will
return -EINVAL if the machine does not support vectors.
7.4 KVM_CAP_S390_USER_STSI
Architectures: s390
Parameters: none
This capability allows post-handlers for the STSI instruction. After
initial handling in the kernel, KVM exits to user space with
KVM_EXIT_S390_STSI to allow user space to insert further data.
Before exiting to userspace, kvm handlers should fill in s390_stsi field of
vcpu->run:
struct {
__u64 addr;
__u8 ar;
__u8 reserved;
__u8 fc;
__u8 sel1;
__u16 sel2;
} s390_stsi;
@addr - guest address of STSI SYSIB
@fc - function code
@sel1 - selector 1
@sel2 - selector 2
@ar - access register number
KVM handlers should exit to userspace with rc = -EREMOTE.