KVM: s390: interrupt: Fix single-stepping into interrupt handlers

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After single-stepping an instruction that generates an interrupt, GDB
ends up on the second instruction of the respective interrupt handler.

The reason is that vcpu_pre_run() manually delivers the interrupt, and
then __vcpu_run() runs the first handler instruction using the
CPUSTAT_P flag. This causes a KVM_SINGLESTEP exit on the second handler
instruction.

Fix by delaying the KVM_SINGLESTEP exit until after the manual
interrupt delivery.

Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-ID: <20230725143857.228626-2-iii@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>

...

This commit is contained in:

Ilya Leoshkevich 2023-07-25 16:37:16 +02:00 • committed by Janosch Frank

parent ede6d0b203

commit 16631c42e6

2 changed files with 16 additions and 2 deletions

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14

arch/s390/kvm/interrupt.c

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4

arch/s390/kvm/kvm-s390.c

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