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Commit a7546054 authored by Marc Zyngier's avatar Marc Zyngier Committed by Christoffer Dall
Browse files

KVM: arm/arm64: GICv4: Enable VLPI support 



All it takes is the has_v4 flag to be set in gic_kvm_info
as well as "kvm-arm.vgic_v4_enable=1" being passed on the
command line for GICv4 to be enabled in KVM.

Acked-by: default avatarChristoffer Dall <cdall@linaro.org>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
parent d3d83f7f

Documentation/admin-guide/kernel-parameters.txt

+4 −0
Original line number Diff line number Diff line
@@ -1881,6 +1881,10 @@ 
			[KVM,ARM] Trap guest accesses to GICv3 common

			system registers



	kvm-arm.vgic_v4_enable=

			[KVM,ARM] Allow use of GICv4 for direct injection of

			LPIs.



	kvm-intel.ept=	[KVM,Intel] Disable extended page tables

			(virtualized MMU) support on capable Intel chips.

			Default is 1 (enabled)

virt/kvm/arm/vgic/vgic-v3.c

+14 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
static bool group0_trap;

static bool group1_trap;

static bool common_trap;

static bool gicv4_enable;



void vgic_v3_set_underflow(struct kvm_vcpu *vcpu)

{
@@ -461,6 +462,12 @@ static int __init early_common_trap_cfg(char *buf) 
}

early_param("kvm-arm.vgic_v3_common_trap", early_common_trap_cfg);



static int __init early_gicv4_enable(char *buf)

{

	return strtobool(buf, &gicv4_enable);

}

early_param("kvm-arm.vgic_v4_enable", early_gicv4_enable);



/**

 * vgic_v3_probe - probe for a GICv3 compatible interrupt controller in DT

 * @node:	pointer to the DT node
@@ -480,6 +487,13 @@ int vgic_v3_probe(const struct gic_kvm_info *info) 
	kvm_vgic_global_state.can_emulate_gicv2 = false;

	kvm_vgic_global_state.ich_vtr_el2 = ich_vtr_el2;



	/* GICv4 support? */

	if (info->has_v4) {

		kvm_vgic_global_state.has_gicv4 = gicv4_enable;

		kvm_info("GICv4 support %sabled\n",

			 gicv4_enable ? "en" : "dis");

	}



	if (!info->vcpu.start) {

		kvm_info("GICv3: no GICV resource entry\n");

		kvm_vgic_global_state.vcpu_base = 0;