From dd1d5fd9684beeb0c14c39f497ef2aa9ac683aa7 Mon Sep 17 00:00:00 2001 From: Matthew Rosato Date: Fri, 2 Sep 2022 13:27:32 -0400 Subject: 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 Acked-by: Thomas Huth Message-Id: <20220902172737.170349-4-mjrosato@linux.ibm.com> Signed-off-by: Thomas Huth --- hw/s390x/s390-pci-kvm.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 hw/s390x/s390-pci-kvm.c (limited to 'hw/s390x/s390-pci-kvm.c') diff --git a/hw/s390x/s390-pci-kvm.c b/hw/s390x/s390-pci-kvm.c new file mode 100644 index 0000000000..0f16104a74 --- /dev/null +++ b/hw/s390x/s390-pci-kvm.c @@ -0,0 +1,22 @@ +/* + * s390 zPCI KVM interfaces + * + * Copyright 2022 IBM Corp. + * Author(s): Matthew Rosato + * + * This work is licensed under the terms of the GNU GPL, version 2 or (at + * your option) any later version. See the COPYING file in the top-level + * directory. + */ + +#include "qemu/osdep.h" + +#include "kvm/kvm_s390x.h" +#include "hw/s390x/pv.h" +#include "hw/s390x/s390-pci-kvm.h" +#include "cpu_models.h" + +bool s390_pci_kvm_interp_allowed(void) +{ + return kvm_s390_get_zpci_op() && !s390_is_pv(); +} -- cgit v1.2.3-55-g7522