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authorCollin Walling <walling@linux.ibm.com>2020-12-07 10:41:25 -0500
committerChristian Borntraeger <borntraeger@de.ibm.com>2020-12-10 13:36:05 +0100
commitefaa83a3736d392c61499ee3aad8690a142675cd (patch)
tree8014cee4063fca83650727d0e23ed438921dbdba /arch/s390
parent0cd2a787cffb5750ba2e7b5de39a6f3d1dfc17e9 (diff)
KVM: selftests: sync_regs test for diag318
The DIAGNOSE 0x0318 instruction, unique to s390x, is a privileged call that must be intercepted via SIE, handled in userspace, and the information set by the instruction is communicated back to KVM. To test the instruction interception, an ad-hoc handler is defined which simply has a VM execute the instruction and then userspace will extract the necessary info. The handler is defined such that the instruction invocation occurs only once. It is up to the caller to determine how the info returned by this handler should be used. The diag318 info is communicated from userspace to KVM via a sync_regs call. This is tested during a sync_regs test, where the diag318 info is requested via the handler, then the info is stored in the appropriate register in KVM via a sync registers call. If KVM does not support diag318, then the tests will print a message stating that diag318 was skipped, and the asserts will simply test against a value of 0. Signed-off-by: Collin Walling <walling@linux.ibm.com> Link: https://lore.kernel.org/r/20201207154125.10322-1-walling@linux.ibm.com Acked-by: Janosch Frank <frankja@linux.ibm.com> Acked-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
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