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[PATCH v2 5/6] hw/arm/virt: kvm: Check the chosen gic version is support
From: |
Eric Auger |
Subject: |
[PATCH v2 5/6] hw/arm/virt: kvm: Check the chosen gic version is supported by the host |
Date: |
Sun, 1 Mar 2020 11:40:39 +0100 |
Restructure the finalize_gic_version with switch cases and, in
KVM mode, 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.
Signed-off-by: Eric Auger <address@hidden>
---
hw/arm/virt.c | 76 +++++++++++++++++++++++++++++++++++----------------
1 file changed, 52 insertions(+), 24 deletions(-)
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index eb8c57c85e..610bfc9ee9 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -1542,33 +1542,61 @@ 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 = kvm_arm_vgic_probe();
- if (!probe_bitmap) {
- error_report(
- "Unable to determine GIC version supported by host");
- 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;
- }
- }
+ if (!probe_bitmap) {
+ error_report("Unable to determine GIC version supported by host");
+ exit(1);
}
- } else if (vms->gic_version == VIRT_GIC_VERSION_NOSEL) {
+
+ switch (vms->gic_version) {
+ case VIRT_GIC_VERSION_NOSEL:
+ vms->gic_version = VIRT_GIC_VERSION_2;
+ break;
+ 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_2:
+ case VIRT_GIC_VERSION_3:
+ break;
+ }
+
+ if (!kvm_irqchip_in_kernel()) {
+ return;
+ }
+
+ /* 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);
+ default: /* explicit V2/V3 are left untouched */
+ break;
}
}
--
2.20.1
- [PATCH v2 0/6] hw/arm/virt: kvm: allow gicv3 by default if v2 cannot work, Eric Auger, 2020/03/01
- [PATCH v2 1/6] hw/arm/virt: Document 'max' value in gic-version property description, Eric Auger, 2020/03/01
- [PATCH v2 2/6] hw/arm/virt: Use VIRT_GIC_VERSION defines, Eric Auger, 2020/03/01
- [PATCH v2 3/6] hw/arm/virt: Introduce finalize_gic_version(), Eric Auger, 2020/03/01
- [PATCH v2 4/6] target/arm/kvm: Let kvm_arm_vgic_probe() return a bitmap, Eric Auger, 2020/03/01
- [PATCH v2 5/6] hw/arm/virt: kvm: Check the chosen gic version is supported by the host,
Eric Auger <=
- [PATCH v2 6/6] hw/arm/virt: kvm: allow gicv3 by default if v2 cannot work, Eric Auger, 2020/03/01
- Re: [PATCH v2 0/6] hw/arm/virt: kvm: allow gicv3 by default if v2 cannot work, Andrew Jones, 2020/03/02