On 1/17/24 5:31 AM, Cédric Le Goater wrote:
> Hello Matthew,
>
> On 1/16/24 23:31, Matthew Rosato wrote:
>> Typically we refresh the host fh during CLP enable, however it's possible
>> that the device goes through multiple reset events before the guest
>> performs another CLP enable. Let's handle this for now by refreshing the
>> host handle from vfio before disabling aif.
>>
>> Fixes: 03451953c7 ("s390x/pci: reset ISM passthrough devices on shutdown and
>> system reset")
>> Reported-by: Cédric Le Goater <[email protected]>
>> Signed-off-by: Matthew Rosato <[email protected]>
>> ---
>> hw/s390x/s390-pci-kvm.c | 11 ++++++++++-
>> 1 file changed, 10 insertions(+), 1 deletion(-)
>>
>> diff --git a/hw/s390x/s390-pci-kvm.c b/hw/s390x/s390-pci-kvm.c
>> index f7e10cfa72..9eef4fc3ec 100644
>> --- a/hw/s390x/s390-pci-kvm.c
>> +++ b/hw/s390x/s390-pci-kvm.c
>> @@ -18,6 +18,7 @@
>> #include "hw/s390x/s390-pci-bus.h"
>> #include "hw/s390x/s390-pci-kvm.h"
>> #include "hw/s390x/s390-pci-inst.h"
>> +#include "hw/s390x/s390-pci-vfio.h"
>> #include "cpu_models.h"
>> bool s390_pci_kvm_interp_allowed(void)
>> @@ -64,9 +65,17 @@ int s390_pci_kvm_aif_disable(S390PCIBusDevice *pbdev)
>> return -EINVAL;
>> }
>> + /*
>> + * The device may have already been reset but we still want to
>> relinquish
>> + * the guest ISC, so always be sure to use an up-to-date host fh.
>> + */
>> + if (!s390_pci_get_host_fh(pbdev, &args.fh)) {
>> + return -EPERM;
>> + }
>> +
>> rc = kvm_vm_ioctl(kvm_state, KVM_S390_ZPCI_OP, &args);
>> if (rc == 0) {
>> - pbev->aif = false;
>> + pbdev->aif = false;
>> }
>
> This belongs to patch 1.
>
>
Thanks for pointing that out, will fix.
