qemu-kvm/kvm-hw-arm-virt-Add-properties-to-disable-high-memory-re.patch

From e670722b9a6460d41497688d820d5a9a9b51d8e9 Mon Sep 17 00:00:00 2001
From: Gavin Shan <gshan@redhat.com>
Date: Tue, 9 Jan 2024 11:36:42 +1000
Subject: [PATCH 001/101] hw/arm/virt: Add properties to disable high memory
 regions

RH-Author: Gavin Shan <gshan@redhat.com>
RH-MergeRequest: 210: hw/arm/virt: Add properties to disable high memory regions
RH-Jira: RHEL-19738
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: Eric Auger <eric.auger@redhat.com>
RH-Commit: [1/1] 4097ba5133a67126e30b84202cb40df4e019c5f4

Upstream: RHEL-only
Brew: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=57927352

There are 3 high memory regions for GICv3 or GICv4 redistributor, PCI
ECAM and PCI MMIO. Each of them has a property introduced by upstream
commit 6a48c64eec ("hw/arm/virt: Add properties to disable high memory
regions") so that the corresponding high memory region can be disabled.

It's notable that another property ("compact-highmem") introduced by
upstream commit f40408a9fe ("hw/arm/virt: Add 'compact-highmem' property")
so that the compact high memory region layout during assignment can be
disabled, compatible to the old machine types. However, we don't have
the compatible issue since the compact high memory region layout is
always kept as disabled until RHEL9.2.0 machine type and onwards.

Expose those 3 properties: "highmem-redists", "highmem-ecam" and
"highmem-mmio". The property "compact-highmem" is kept as hidden.

Signed-off-by: Gavin Shan <gshan@redhat.com>
---
 hw/arm/virt.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 5cab00b4cd..60f117f0d2 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -2456,6 +2456,7 @@ static void virt_set_compact_highmem(Object *obj, bool value, Error **errp)
 
     vms->highmem_compact = value;
 }
+#endif /* disabled for RHEL */
 
 static bool virt_get_highmem_redists(Object *obj, Error **errp)
 {
@@ -2498,7 +2499,6 @@ static void virt_set_highmem_mmio(Object *obj, bool value, Error **errp)
 
     vms->highmem_mmio = value;
 }
-#endif /* disabled for RHEL */
 
 static bool virt_get_its(Object *obj, Error **errp)
 {
@@ -3521,6 +3521,28 @@ static void rhel_machine_class_init(ObjectClass *oc, void *data)
                                           "Set on/off to enable/disable using "
                                           "physical address space above 32 bits");
 
+    object_class_property_add_bool(oc, "highmem-redists",
+                                   virt_get_highmem_redists,
+                                   virt_set_highmem_redists);
+    object_class_property_set_description(oc, "highmem-redists",
+                                          "Set on/off to enable/disable high "
+                                          "memory region for GICv3 or GICv4 "
+                                          "redistributor");
+
+    object_class_property_add_bool(oc, "highmem-ecam",
+                                   virt_get_highmem_ecam,
+                                   virt_set_highmem_ecam);
+    object_class_property_set_description(oc, "highmem-ecam",
+                                          "Set on/off to enable/disable high "
+                                          "memory region for PCI ECAM");
+
+    object_class_property_add_bool(oc, "highmem-mmio",
+                                   virt_get_highmem_mmio,
+                                   virt_set_highmem_mmio);
+    object_class_property_set_description(oc, "highmem-mmio",
+                                          "Set on/off to enable/disable high "
+                                          "memory region for PCI MMIO");
+
     object_class_property_add_str(oc, "gic-version", virt_get_gic_version,
                                   virt_set_gic_version);
     object_class_property_set_description(oc, "gic-version",
-- 
2.39.3