s390x/pci: enable for load/store interpretation

If the ZPCI_OP ioctl reports that is is available and usable, then the
underlying KVM host will enable load/store intepretation for any guest
device without a SHM bit in the guest function handle.  For a device that
will be using interpretation support, ensure the guest function handle
matches the host function handle; this value is re-checked every time the
guest issues a SET PCI FN to enable the guest device as it is the only
opportunity to reflect function handle changes.

By default, unless interpret=off is specified, interpretation support will
always be assumed and exploited if the necessary ioctl and features are
available on the host kernel.  When these are unavailable, we will silently
revert to the interception model; this allows existing guest configurations
to work unmodified on hosts with and without zPCI interpretation support,
allowing QEMU to choose the best support model available.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Acked-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20220902172737.170349-4-mjrosato@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index 6d400d4..651ec38 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -18,6 +18,8 @@
 #include "sysemu/hw_accel.h"
 #include "hw/s390x/s390-pci-inst.h"
 #include "hw/s390x/s390-pci-bus.h"
+#include "hw/s390x/s390-pci-kvm.h"
+#include "hw/s390x/s390-pci-vfio.h"
 #include "hw/s390x/tod.h"
 
 #ifndef DEBUG_S390PCI_INST
@@ -246,6 +248,20 @@ int clp_service_call(S390CPU *cpu, uint8_t r2, uintptr_t ra)
                 goto out;
             }
 
+            /*
+             * Take this opportunity to make sure we still have an accurate
+             * host fh.  It's possible part of the handle changed while the
+             * device was disabled to the guest (e.g. vfio hot reset for
+             * ISM during plug)
+             */
+            if (pbdev->interp) {
+                /* Take this opportunity to make sure we are sync'd with host */
+                if (!s390_pci_get_host_fh(pbdev, &pbdev->fh) ||
+                    !(pbdev->fh & FH_MASK_ENABLE)) {
+                    stw_p(&ressetpci->hdr.rsp, CLP_RC_SETPCIFN_FH);
+                    goto out;
+                }
+            }
             pbdev->fh |= FH_MASK_ENABLE;
             pbdev->state = ZPCI_FS_ENABLED;
             stl_p(&ressetpci->fh, pbdev->fh);