KVM: s390: vsie: retry SIE instruction on host intercepts

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It's possible that SIE exits for work that the host needs to perform
rather than something that is intended for the guest.

A Linux guest will ignore this intercept code since there is nothing
for it to do, but a more robust solution would rewind the PSW back to
the SIE instruction. This will transparently resume the guest once
the host completes its work, without the guest needing to process
what is effectively a NOP and re-issue SIE itself.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Link: https://lore.kernel.org/r/20240301204342.3217540-1-farman@linux.ibm.com
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Message-ID: <20240301204342.3217540-1-farman@linux.ibm.com>

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Eric Farman 2024-03-01 21:43:42 +01:00 • committed by Janosch Frank

parent 98f770389f

commit 33a729a177

1 changed files with 19 additions and 3 deletions

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arch/s390/kvm/vsie.c

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