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qemu: refactor maximum vcpus supported in aarch64

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on aarch64, we support different gic interrupt controllers.
The maximum number of vCPUs depends on the GIC version, or on how
many redistributors we can fit into the memory map.

Fixes: #584

Signed-off-by: Penny Zheng <penny.zheng@arm.com>
Signed-off-by: Wei Chen <Wei.Chen@arm.com>
This commit is contained in:
root 2018-08-27 13:55:24 +08:00
parent 39ad9702de
commit c4ded6ee5e
1 changed files with 14 additions and 0 deletions
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14
virtcontainers/qemu_arm64.go
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@ -107,8 +107,22 @@ func getGuestGICVersion() (version string) {
return "host"
}
//In qemu, maximum number of vCPUs depends on the GIC version, or on how
//many redistributors we can fit into the memory map.
//related codes are under github.com/qemu/qemu/hw/arm/virt.c(Line 135 and 1306 in stable-2.11)
//for now, qemu only supports v2 and v3, we treat v4 as v3 based on
//backward compatibility.
var gicList = map[uint32]uint32{
uint32(2): uint32(8),
uint32(3): uint32(123),
uint32(4): uint32(123),
}
// MaxQemuVCPUs returns the maximum number of vCPUs supported
func MaxQemuVCPUs() uint32 {
if hostGICVersion != 0 {
return gicList[hostGICVersion]
}
return uint32(runtime.NumCPU())
}