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170 lines
6.8 KiB
170 lines
6.8 KiB
From 4ab2aff624908e49b099f00609875f4d03e9e1ec Mon Sep 17 00:00:00 2001
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From: Gavin Shan <gshan@redhat.com>
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Date: Wed, 21 Dec 2022 08:48:45 +0800
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Subject: [PATCH 6/8] hw/arm/virt: Add 'compact-highmem' property
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RH-Author: Gavin Shan <gshan@redhat.com>
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RH-MergeRequest: 126: hw/arm/virt: Optimize high memory region address assignment
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RH-Bugzilla: 2113840
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RH-Acked-by: Eric Auger <eric.auger@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [6/8] 781506f3445493f05b511547370b6d88ef092457
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2113840
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After the improvement to high memory region address assignment is
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applied, the memory layout can be changed, introducing possible
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migration breakage. For example, VIRT_HIGH_PCIE_MMIO memory region
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is disabled or enabled when the optimization is applied or not, with
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the following configuration. The configuration is only achievable by
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modifying the source code until more properties are added to allow
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users selectively disable those high memory regions.
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pa_bits = 40;
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vms->highmem_redists = false;
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vms->highmem_ecam = false;
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vms->highmem_mmio = true;
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# qemu-system-aarch64 -accel kvm -cpu host \
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-machine virt-7.2,compact-highmem={on, off} \
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-m 4G,maxmem=511G -monitor stdio
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Region compact-highmem=off compact-highmem=on
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----------------------------------------------------------------
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MEM [1GB 512GB] [1GB 512GB]
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HIGH_GIC_REDISTS2 [512GB 512GB+64MB] [disabled]
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HIGH_PCIE_ECAM [512GB+256MB 512GB+512MB] [disabled]
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HIGH_PCIE_MMIO [disabled] [512GB 1TB]
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In order to keep backwords compatibility, we need to disable the
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optimization on machine, which is virt-7.1 or ealier than it. It
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means the optimization is enabled by default from virt-7.2. Besides,
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'compact-highmem' property is added so that the optimization can be
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explicitly enabled or disabled on all machine types by users.
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Signed-off-by: Gavin Shan <gshan@redhat.com>
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Reviewed-by: Eric Auger <eric.auger@redhat.com>
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Reviewed-by: Cornelia Huck <cohuck@redhat.com>
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Reviewed-by: Marc Zyngier <maz@kernel.org>
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Tested-by: Zhenyu Zhang <zhenyzha@redhat.com>
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Message-id: 20221029224307.138822-7-gshan@redhat.com
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Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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(cherry picked from commit f40408a9fe5d1db70a75a33d2b26c8af8a5d57b0)
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Signed-off-by: Gavin Shan <gshan@redhat.com>
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Conflicts:
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hw/arm/virt.c
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Comment out the handlers of property 'compact-highmem' since
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the property isn't exposed.
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---
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docs/system/arm/virt.rst | 4 ++++
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hw/arm/virt.c | 34 ++++++++++++++++++++++++++++++++++
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include/hw/arm/virt.h | 1 +
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3 files changed, 39 insertions(+)
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diff --git a/docs/system/arm/virt.rst b/docs/system/arm/virt.rst
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index 20442ea2c1..4454706392 100644
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--- a/docs/system/arm/virt.rst
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+++ b/docs/system/arm/virt.rst
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@@ -94,6 +94,10 @@ highmem
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address space above 32 bits. The default is ``on`` for machine types
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later than ``virt-2.12``.
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+compact-highmem
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+ Set ``on``/``off`` to enable/disable the compact layout for high memory regions.
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+ The default is ``on`` for machine types later than ``virt-7.2``.
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+
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gic-version
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Specify the version of the Generic Interrupt Controller (GIC) to provide.
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Valid values are:
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diff --git a/hw/arm/virt.c b/hw/arm/virt.c
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index 6896e0ca0f..6087511ae9 100644
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--- a/hw/arm/virt.c
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+++ b/hw/arm/virt.c
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@@ -216,6 +216,12 @@ static const MemMapEntry base_memmap[] = {
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* Note the extended_memmap is sized so that it eventually also includes the
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* base_memmap entries (VIRT_HIGH_GIC_REDIST2 index is greater than the last
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* index of base_memmap).
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+ *
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+ * The memory map for these Highmem IO Regions can be in legacy or compact
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+ * layout, depending on 'compact-highmem' property. With legacy layout, the
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+ * PA space for one specific region is always reserved, even if the region
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+ * has been disabled or doesn't fit into the PA space. However, the PA space
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+ * for the region won't be reserved in these circumstances with compact layout.
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*/
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static MemMapEntry extended_memmap[] = {
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/* Additional 64 MB redist region (can contain up to 512 redistributors) */
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@@ -2400,6 +2406,22 @@ static void virt_set_highmem(Object *obj, bool value, Error **errp)
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vms->highmem = value;
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}
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+#if 0 /* Disabled for Red Hat Enterprise Linux */
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+static bool virt_get_compact_highmem(Object *obj, Error **errp)
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+{
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+ VirtMachineState *vms = VIRT_MACHINE(obj);
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+
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+ return vms->highmem_compact;
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+}
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+
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+static void virt_set_compact_highmem(Object *obj, bool value, Error **errp)
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+{
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+ VirtMachineState *vms = VIRT_MACHINE(obj);
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+
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+ vms->highmem_compact = value;
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+}
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+#endif /* disabled for RHEL */
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+
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static bool virt_get_its(Object *obj, Error **errp)
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{
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VirtMachineState *vms = VIRT_MACHINE(obj);
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@@ -3023,6 +3045,13 @@ static void virt_machine_class_init(ObjectClass *oc, void *data)
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"Set on/off to enable/disable using "
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"physical address space above 32 bits");
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+ object_class_property_add_bool(oc, "compact-highmem",
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+ virt_get_compact_highmem,
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+ virt_set_compact_highmem);
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+ object_class_property_set_description(oc, "compact-highmem",
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+ "Set on/off to enable/disable compact "
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+ "layout for high memory regions");
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+
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object_class_property_add_str(oc, "gic-version", virt_get_gic_version,
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virt_set_gic_version);
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object_class_property_set_description(oc, "gic-version",
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@@ -3107,6 +3136,7 @@ static void virt_instance_init(Object *obj)
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/* High memory is enabled by default */
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vms->highmem = true;
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+ vms->highmem_compact = !vmc->no_highmem_compact;
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vms->gic_version = VIRT_GIC_VERSION_NOSEL;
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vms->highmem_ecam = !vmc->no_highmem_ecam;
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@@ -3176,8 +3206,12 @@ DEFINE_VIRT_MACHINE_AS_LATEST(7, 2)
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static void virt_machine_7_1_options(MachineClass *mc)
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{
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+ VirtMachineClass *vmc = VIRT_MACHINE_CLASS(OBJECT_CLASS(mc));
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+
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virt_machine_7_2_options(mc);
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compat_props_add(mc->compat_props, hw_compat_7_1, hw_compat_7_1_len);
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+ /* Compact layout for high memory regions was introduced with 7.2 */
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+ vmc->no_highmem_compact = true;
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}
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DEFINE_VIRT_MACHINE(7, 1)
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diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
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index 15bd291311..85e7d61868 100644
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--- a/include/hw/arm/virt.h
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+++ b/include/hw/arm/virt.h
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@@ -125,6 +125,7 @@ struct VirtMachineClass {
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bool no_pmu;
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bool claim_edge_triggered_timers;
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bool smbios_old_sys_ver;
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+ bool no_highmem_compact;
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bool no_highmem_ecam;
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bool no_ged; /* Machines < 4.2 have no support for ACPI GED device */
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bool kvm_no_adjvtime;
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--
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2.31.1
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