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783f0a3ccd
This patch adds s390dbf logging to the function that executes the PQAP(AQIC) instruction on behalf of the guest to which the queue for which interrupts are being enabled or disabled is attached. Currently, the vfio_ap_irq_enable function sets status response code 06 (notification indicator byte address (nib) invalid) in the status word when the vfio_pin_pages function - called to pin the page containing the nib - returns an error or a different number of pages pinned than requested. Setting the response code returned to userspace without also logging a message in the kernel makes it impossible to determine whether the response was due to an error detected by the vfio_ap device driver or because the response code was returned by the firmware in response to the PQAP(AQIC) instruction. In addition to logging a warning for the situation above, this patch adds the following: * A function to validate the nib address invoked prior to calling the vfio_pin_pages function. This allows for logging a message informing the reader of the reason the page containing the nib can not be pinned if the nib address is not valid. Response code 06 (invalid nib address) will be set in the status word returned to the guest from the instruction. * Checks the return value from the kvm_s390_gisc_register and logs a message informing the reader of the failure. Status response code 08 (invalid gisa) will be set in the status word returned to the guest from the PQAP(AQIC) instruction. * Checks the status response code returned from execution of the PQAP(AQIC) instruction and if it indicates an error, logs a message informing the reader. Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com> Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> |
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