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[Qemu-arm] [RFC v3 7/8] hw/arm/virt: Register two redistributor regions
From: |
Eric Auger |
Subject: |
[Qemu-arm] [RFC v3 7/8] hw/arm/virt: Register two redistributor regions when necessary |
Date: |
Wed, 30 May 2018 13:45:40 +0200 |
With a VGICv3 KVM device, if the number of vcpus exceeds the
capacity of the legacy redistributor region (123 redistributors),
we now attempt to register a second redistributor region. Up to
512 redistributors can fit in this latter on top of the 123 allowed
by the legacy redistributor region.
Registering this second redistributor region is possible if the
host kernel supports the following VGICv3 KVM device group/attribute:
KVM_DEV_ARM_VGIC_GRP_ADDR/KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION.
In case the host kernel does not support the registration of several
redistributor regions and the requested number of vcpus exceeds the
capacity of the legacy redistributor region, the GICv3 device
initialization fails with a proper error message and qemu exits.
At the moment the max number of vcpus still is capped by the
virt machine class max_cpus.
Signed-off-by: Eric Auger <address@hidden>
---
v2 -> v3:
- remove spare space
---
hw/arm/virt.c | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 3018ec2..c00f47d 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -529,6 +529,7 @@ static void create_gic(VirtMachineState *vms, qemu_irq *pic)
SysBusDevice *gicbusdev;
const char *gictype;
int type = vms->gic_version, i;
+ uint32_t nb_redist_regions = 0;
gictype = (type == 3) ? gicv3_class_name() : gic_class_name();
@@ -548,14 +549,28 @@ static void create_gic(VirtMachineState *vms, qemu_irq
*pic)
vms->memmap[VIRT_GIC_REDIST].size / GICV3_REDIST_SIZE;
uint32_t redist0_count = MIN(smp_cpus, redist0_capacity);
- qdev_prop_set_uint32(gicdev, "len-redist-region-count", 1);
+ nb_redist_regions = virt_gicv3_redist_region_count(vms);
+
+ qdev_prop_set_uint32(gicdev, "len-redist-region-count",
+ nb_redist_regions);
qdev_prop_set_uint32(gicdev, "redist-region-count[0]", redist0_count);
+
+ if (nb_redist_regions == 2) {
+ uint32_t redist1_capacity =
+ vms->memmap[VIRT_GIC_REDIST2].size / GICV3_REDIST_SIZE;
+
+ qdev_prop_set_uint32(gicdev, "redist-region-count[1]",
+ MIN(smp_cpus - redist0_count, redist1_capacity));
+ }
}
qdev_init_nofail(gicdev);
gicbusdev = SYS_BUS_DEVICE(gicdev);
sysbus_mmio_map(gicbusdev, 0, vms->memmap[VIRT_GIC_DIST].base);
if (type == 3) {
sysbus_mmio_map(gicbusdev, 1, vms->memmap[VIRT_GIC_REDIST].base);
+ if (nb_redist_regions == 2) {
+ sysbus_mmio_map(gicbusdev, 2, vms->memmap[VIRT_GIC_REDIST2].base);
+ }
} else {
sysbus_mmio_map(gicbusdev, 1, vms->memmap[VIRT_GIC_CPU].base);
}
@@ -1351,6 +1366,7 @@ static void machvirt_init(MachineState *machine)
*/
if (vms->gic_version == 3) {
virt_max_cpus = vms->memmap[VIRT_GIC_REDIST].size / GICV3_REDIST_SIZE;
+ virt_max_cpus += vms->memmap[VIRT_GIC_REDIST2].size /
GICV3_REDIST_SIZE;
} else {
virt_max_cpus = GIC_NCPU;
}
--
2.5.5
- [Qemu-arm] [RFC v3 0/8] KVM/ARM: Relax the max 123 vcpus limitation along with KVM GICv3, Eric Auger, 2018/05/30
- [Qemu-arm] [RFC v3 1/8] linux-headers: Partial update for KVM/ARM multiple redistributor region registration, Eric Auger, 2018/05/30
- [Qemu-arm] [RFC v3 3/8] hw/intc/arm_gicv3: Introduce redist-region-count array property, Eric Auger, 2018/05/30
- [Qemu-arm] [RFC v3 4/8] hw/intc/arm_gicv3_kvm: Get prepared to handle multiple redist regions, Eric Auger, 2018/05/30
- [Qemu-arm] [RFC v3 2/8] target/arm: Allow KVM device address overwriting, Eric Auger, 2018/05/30
- [Qemu-arm] [RFC v3 5/8] hw/arm/virt: GICv3 DT node with one or two redistributor regions, Eric Auger, 2018/05/30
- [Qemu-arm] [RFC v3 6/8] hw/arm/virt-acpi-build: Advertise one or two GICR structures, Eric Auger, 2018/05/30
- [Qemu-arm] [RFC v3 7/8] hw/arm/virt: Register two redistributor regions when necessary,
Eric Auger <=
- [Qemu-arm] [RFC v3 8/8] hw/arm/virt: Add virt-3.0 machine type supporting up to 512 vcpus, Eric Auger, 2018/05/30