On 12/7/20 10:41 AM, Collin Walling wrote: > 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@xxxxxxxxxxxxx> Please add Acked-by: Janosch Frank <frankja@xxxxxxxxxxxxx> [...] -- Regards, Collin Stay safe and stay healthy
