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KVM: s390: Add sthyi emulation

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Store Hypervisor Information is an emulated z/VM instruction that
provides a guest with basic information about the layers it is running
on. This includes information about the cpu configuration of both the
machine and the lpar, as well as their names, machine model and
machine type. This information enables an application to determine the
maximum capacity of CPs and IFLs available to software.

The instruction is available whenever the facility bit 74 is set,
otherwise executing it results in an operation exception.

It is important to check the validity flags in the sections before
using data from any structure member. It is not guaranteed that all
members will be valid on all machines / machine configurations.

Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Janosch Frank
2016-05-23 15:11:58 +02:00
committed by Christian Borntraeger
parent a2d57b35c0
commit 95ca2cb579
9 changed files with 507 additions and 1 deletions
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2
arch/s390/include/asm/kvm_host.h
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@@ -154,6 +154,7 @@ struct kvm_s390_sie_block {
#define LCTL_CR14 0x0002
__u16 lctl; /* 0x0044 */
__s16 icpua; /* 0x0046 */
#define ICTL_OPEREXC 0x80000000
#define ICTL_PINT 0x20000000
#define ICTL_LPSW 0x00400000
#define ICTL_STCTL 0x00040000
@@ -279,6 +280,7 @@ struct kvm_vcpu_stat {
u32 instruction_stfl;
u32 instruction_tprot;
u32 instruction_essa;
u32 instruction_sthyi;
u32 instruction_sigp_sense;
u32 instruction_sigp_sense_running;
u32 instruction_sigp_external_call;