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hw/arm/virt: Support TCG GICv4

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Add support for the TCG GICv4 to the virt board. For the board,
the GICv4 is very similar to the GICv3, with the only difference
being the size of the redistributor frame. The changes here are thus:
 * calculating virt_redist_capacity correctly for GICv4
 * changing various places which were "if GICv3" to be "if not GICv2"
 * the commandline option handling

Note that using GICv4 reduces the maximum possible number of CPUs on
the virt board from 512 to 317, because we can now only fit half as
many redistributors into the redistributor regions we have defined.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-42-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2022-04-08 15:15:50 +01:00
parent f31985a77a
commit 7cf3f8d243
3 changed files with 67 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

12
include/hw/arm/virt.h
View file

@ -113,6 +113,7 @@ typedef enum VirtGICType {
VIRT_GIC_VERSION_HOST,
VIRT_GIC_VERSION_2,
VIRT_GIC_VERSION_3,
VIRT_GIC_VERSION_4,
VIRT_GIC_VERSION_NOSEL,
} VirtGICType;
@ -188,7 +189,14 @@ bool virt_is_acpi_enabled(VirtMachineState *vms);
/* Return number of redistributors that fit in the specified region */
static uint32_t virt_redist_capacity(VirtMachineState *vms, int region)
{
return vms->memmap[region].size / GICV3_REDIST_SIZE;
uint32_t redist_size;
if (vms->gic_version == VIRT_GIC_VERSION_3) {
redist_size = GICV3_REDIST_SIZE;
} else {
redist_size = GICV4_REDIST_SIZE;
}
return vms->memmap[region].size / redist_size;
}
/* Return the number of used redistributor regions */
@ -196,7 +204,7 @@ static inline int virt_gicv3_redist_region_count(VirtMachineState *vms)
{
uint32_t redist0_capacity = virt_redist_capacity(vms, VIRT_GIC_REDIST);
assert(vms->gic_version == VIRT_GIC_VERSION_3);
assert(vms->gic_version != VIRT_GIC_VERSION_2);
return (MACHINE(vms)->smp.cpus > redist0_capacity &&
vms->highmem_redists) ? 2 : 1;