On 02.04.19 19:46, Collin Walling wrote: > Execution of DIAGNOSE 0x318 is fenced by checking an SCLP bit > for the availability of hardware support for the instruction. > > In order to support this instruction for a KVM/QEMU guest, we > would need to provide modifications to the SCLP Read SCP Info > data, which will in turn reduce the maximum number of CPUs that > may be provided to the guest. This issue introduces compatability > and legacy concerns. s/compatability/compatibility/ > > Let's circumvent this issue by removing the bit check and blindly > executing the instruction. An exception table rule is in place to > catch the case where hardware does not support this instruction. Great, another ESSA like instruction... The sclp bit is still there but we can choose to ignore it for a spec exception. > > While we're at it, let's condense the version code fields in the > diag318_info struct until we can determine how it will be used. > > This modifies commit 4ad78b8651aacf26b3ab6d1e784952eb70469c43 > > Signed-off-by: Collin Walling <walling@xxxxxxxxxxxxx>
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