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KVM: arm64: Restore GICv2-on-GICv3 functionality 

When reworking the vgic locking, the vgic distributor registration
got simplified, which was a very good cleanup. But just a tad too
radical, as we now register the *native* vgic only, ignoring the
GICv2-on-GICv3 that allows pre-historic VMs (or so I thought)
to run.

As it turns out, QEMU still defaults to GICv2 in some cases, and
this breaks Nathan's setup!

Fix it by propagating the *requested* vgic type rather than the
host's version.

Fixes: 59112e9c39 ("KVM: arm64: vgic: Fix a circular locking issue")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
link: https://lore.kernel.org/r/20230606221525.GA2269598@dev-arch.thelio-3990X
This commit is contained in:
Marc Zyngier 2023-06-07 15:38:44 +01:00
parent 0c2f9acf6a
commit 1caa71a7a6
1 changed files with 7 additions and 4 deletions
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11
arch/arm64/kvm/vgic/vgic-init.c
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@ -446,6 +446,7 @@ int vgic_lazy_init(struct kvm *kvm)
int kvm_vgic_map_resources(struct kvm *kvm)
{
struct vgic_dist *dist = &kvm->arch.vgic;
enum vgic_type type;
gpa_t dist_base;
int ret = 0;
@ -460,10 +461,13 @@ int kvm_vgic_map_resources(struct kvm *kvm)
if (!irqchip_in_kernel(kvm))
goto out;
if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V2)
if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V2) {
ret = vgic_v2_map_resources(kvm);
else
type = VGIC_V2;
} else {
ret = vgic_v3_map_resources(kvm);
type = VGIC_V3;
}
if (ret) {
__kvm_vgic_destroy(kvm);
@ -473,8 +477,7 @@ int kvm_vgic_map_resources(struct kvm *kvm)
dist_base = dist->vgic_dist_base;
mutex_unlock(&kvm->arch.config_lock);
ret = vgic_register_dist_iodev(kvm, dist_base,
kvm_vgic_global_state.type);
ret = vgic_register_dist_iodev(kvm, dist_base, type);
if (ret) {
kvm_err("Unable to register VGIC dist MMIO regions\n");
kvm_vgic_destroy(kvm);