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hw/arm/virt: kvm: Restructure finalize_gic_version() 

Restructure the finalize_gic_version with switch cases and
clearly separate the following cases:

- KVM mode / in-kernel irqchip
- KVM mode / userspace irqchip
- TCG mode

In KVM mode / in-kernel irqchip , we explictly check whether
the chosen version is supported by the host. If the end-user
explicitly sets v2/v3 and this is not supported by the host,
then the user gets an explicit error message. Note that for
old kernels where the CREATE_DEVICE ioctl doesn't exist then
we will now fail if the user specifically asked for gicv2,
where previously we (probably) would have succeeded.

In KVM mode / userspace irqchip we immediatly output an error
in case the end-user explicitly selected v3. Also we warn the
end-user about the unexpected usage of gic-version=host in
that case as only userspace GICv2 is supported.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Message-id: 20200311131618.7187-6-eric.auger@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Eric Auger 2020-03-11 14:16:17 +01:00 committed by Peter Maydell
parent d45efe4782
commit 97b4c9188c
1 changed files with 67 additions and 21 deletions
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88
hw/arm/virt.c
View File

@ -1543,33 +1543,79 @@ static void virt_set_memmap(VirtMachineState *vms)
*/
static void finalize_gic_version(VirtMachineState *vms)
{
if (vms->gic_version == VIRT_GIC_VERSION_HOST ||
vms->gic_version == VIRT_GIC_VERSION_MAX) {
if (!kvm_enabled()) {
if (vms->gic_version == VIRT_GIC_VERSION_HOST) {
error_report("gic-version=host requires KVM");
exit(1);
} else {
/* "max": currently means 3 for TCG */
vms->gic_version = VIRT_GIC_VERSION_3;
}
} else {
int probe_bitmap = kvm_arm_vgic_probe();
if (kvm_enabled()) {
int probe_bitmap;
if (!probe_bitmap) {
if (!kvm_irqchip_in_kernel()) {
switch (vms->gic_version) {
case VIRT_GIC_VERSION_HOST:
warn_report(
"gic-version=host not relevant with kernel-irqchip=off "
"as only userspace GICv2 is supported. Using v2 ...");
return;
case VIRT_GIC_VERSION_MAX:
case VIRT_GIC_VERSION_NOSEL:
vms->gic_version = VIRT_GIC_VERSION_2;
return;
case VIRT_GIC_VERSION_2:
return;
case VIRT_GIC_VERSION_3:
error_report(
"Unable to determine GIC version supported by host");
"gic-version=3 is not supported with kernel-irqchip=off");
exit(1);
} else {
if (probe_bitmap & KVM_ARM_VGIC_V3) {
vms->gic_version = VIRT_GIC_VERSION_3;
} else {
vms->gic_version = VIRT_GIC_VERSION_2;
}
}
}
} else if (vms->gic_version == VIRT_GIC_VERSION_NOSEL) {
probe_bitmap = kvm_arm_vgic_probe();
if (!probe_bitmap) {
error_report("Unable to determine GIC version supported by host");
exit(1);
}
switch (vms->gic_version) {
case VIRT_GIC_VERSION_HOST:
case VIRT_GIC_VERSION_MAX:
if (probe_bitmap & KVM_ARM_VGIC_V3) {
vms->gic_version = VIRT_GIC_VERSION_3;
} else {
vms->gic_version = VIRT_GIC_VERSION_2;
}
return;
case VIRT_GIC_VERSION_NOSEL:
vms->gic_version = VIRT_GIC_VERSION_2;
break;
case VIRT_GIC_VERSION_2:
case VIRT_GIC_VERSION_3:
break;
}
/* Check chosen version is effectively supported by the host */
if (vms->gic_version == VIRT_GIC_VERSION_2 &&
!(probe_bitmap & KVM_ARM_VGIC_V2)) {
error_report("host does not support in-kernel GICv2 emulation");
exit(1);
} else if (vms->gic_version == VIRT_GIC_VERSION_3 &&
!(probe_bitmap & KVM_ARM_VGIC_V3)) {
error_report("host does not support in-kernel GICv3 emulation");
exit(1);
}
return;
}
/* TCG mode */
switch (vms->gic_version) {
case VIRT_GIC_VERSION_NOSEL:
vms->gic_version = VIRT_GIC_VERSION_2;
break;
case VIRT_GIC_VERSION_MAX:
vms->gic_version = VIRT_GIC_VERSION_3;
break;
case VIRT_GIC_VERSION_HOST:
error_report("gic-version=host requires KVM");
exit(1);
case VIRT_GIC_VERSION_2:
case VIRT_GIC_VERSION_3:
break;
}
}