On 12/7/20 3:19 AM, Christian Borntraeger wrote:
On 07.12.20 09:16, Janosch Frank wrote:
On 12/3/20 10:52 PM, Collin Walling wrote:
The DIAGNOSE 0x0318 instruction, unique to s390x, is a privileged call
s/call/instruction/
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
Acked-by: Janosch Frank frankja@linux.ibm.com
Some nits below.
Collin, can you have a look at the nits and resubmit soon? Then I can pick this for 5.11.
Will do.
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