56 lines
2.2 KiB
Diff
56 lines
2.2 KiB
Diff
From c7b14d3af7c73a3bf0c00911b85f202840d9b414 Mon Sep 17 00:00:00 2001
|
|
From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@redhat.com>
|
|
Date: Mon, 7 Nov 2022 17:13:49 +0100
|
|
Subject: [PATCH 12/42] s390x/s390-virtio-ccw: Switch off zPCI enhancements on
|
|
older machines
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
RH-Author: Cédric Le Goater <clg@redhat.com>
|
|
RH-MergeRequest: 226: s390: Enhanced Interpretation for PCI Functions and Secure Execution guest dump
|
|
RH-Bugzilla: 1664378 2043909
|
|
RH-Acked-by: Thomas Huth <thuth@redhat.com>
|
|
RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
|
|
RH-Acked-by: Jon Maloy <jmaloy@redhat.com>
|
|
RH-Commit: [12/41] 61e32bab6d68ee9abd6a0751944af82e002b05b4
|
|
|
|
zPCI enhancement features (interpretation and forward assist) were
|
|
recently introduced to improve performance on PCI passthrough devices.
|
|
To maintain the same behaviour on older Z machines, deactivate the
|
|
features with the associated properties.
|
|
|
|
Signed-off-by: Cédric Le Goater <clg@redhat.com>
|
|
Message-Id: <20221107161349.1032730-3-clg@kaod.org>
|
|
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
|
|
Signed-off-by: Thomas Huth <thuth@redhat.com>
|
|
(cherry picked from commit d3d1a406127f7da482eafbdc871c120c2770bb91)
|
|
[ clg: applied zPCI restrictions to rhel8.5.0 machine and below ]
|
|
Signed-off-by: Cédric Le Goater <clg@redhat.com>
|
|
---
|
|
hw/s390x/s390-virtio-ccw.c | 6 ++++++
|
|
1 file changed, 6 insertions(+)
|
|
|
|
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
|
|
index bec270598b..bd80e72cf8 100644
|
|
--- a/hw/s390x/s390-virtio-ccw.c
|
|
+++ b/hw/s390x/s390-virtio-ccw.c
|
|
@@ -1130,8 +1130,14 @@ static void ccw_machine_rhel850_instance_options(MachineState *machine)
|
|
|
|
static void ccw_machine_rhel850_class_options(MachineClass *mc)
|
|
{
|
|
+ static GlobalProperty compat[] = {
|
|
+ { TYPE_S390_PCI_DEVICE, "interpret", "off", },
|
|
+ { TYPE_S390_PCI_DEVICE, "forwarding-assist", "off", },
|
|
+ };
|
|
+
|
|
ccw_machine_rhel860_class_options(mc);
|
|
compat_props_add(mc->compat_props, hw_compat_rhel_8_5, hw_compat_rhel_8_5_len);
|
|
+ compat_props_add(mc->compat_props, compat, G_N_ELEMENTS(compat));
|
|
mc->smp_props.prefer_sockets = true;
|
|
}
|
|
DEFINE_CCW_MACHINE(rhel850, "rhel8.5.0", false);
|
|
--
|
|
2.37.3
|
|
|