KVM: s390: Add capability that forwards operation exceptions

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Setting KVM_CAP_S390_USER_OPEREXEC will forward all operation
exceptions to user space. This also includes the 0x0000 instructions
managed by KVM_CAP_S390_USER_INSTR0. It's helpful if user space wants
to emulate instructions which do not (yet) have an opcode.

While we're at it refine the documentation for
KVM_CAP_S390_USER_INSTR0.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>

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This commit is contained in:

Janosch Frank 2025-07-08 12:57:57 +00:00

parent 182a258b5e

commit 8e8678e740

7 changed files with 169 additions and 1 deletions

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17

Documentation/virt/kvm/api.rst

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1

arch/s390/include/asm/kvm_host.h

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3

arch/s390/kvm/intercept.c

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7

arch/s390/kvm/kvm-s390.c

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1

include/uapi/linux/kvm.h

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1

tools/testing/selftests/kvm/Makefile.kvm

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140

tools/testing/selftests/kvm/s390/user_operexec.c

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