From 49a1a2c70a7fd820fe60a65a3e38ab9095082dc9 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Tue, 5 Apr 2022 19:23:27 +0100 Subject: KVM: arm64: vgic-v3: Advertise GICR_CTLR.{IR, CES} as a new GICD_IIDR revision Since adversising GICR_CTLR.{IC,CES} is directly observable from a guest, we need to make it selectable from userspace. For that, bump the default GICD_IIDR revision and let userspace downgrade it to the previous default. For GICv2, the two distributor revisions are strictly equivalent. Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20220405182327.205520-5-maz@kernel.org --- arch/arm64/kvm/vgic/vgic-init.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'arch/arm64/kvm/vgic/vgic-init.c') diff --git a/arch/arm64/kvm/vgic/vgic-init.c b/arch/arm64/kvm/vgic/vgic-init.c index fc00304fe7d8..f84e04f334c6 100644 --- a/arch/arm64/kvm/vgic/vgic-init.c +++ b/arch/arm64/kvm/vgic/vgic-init.c @@ -319,7 +319,12 @@ int vgic_init(struct kvm *kvm) vgic_debug_init(kvm); - dist->implementation_rev = 2; + /* + * If userspace didn't set the GIC implementation revision, + * default to the latest and greatest. You know want it. + */ + if (!dist->implementation_rev) + dist->implementation_rev = KVM_VGIC_IMP_REV_LATEST; dist->initialized = true; out: -- cgit v1.2.3