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    Subject[PATCH v5 25/26] KVM: arm/arm64: GICv4: Enable VLPI support
    Date
    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: Christoffer Dall <cdall@linaro.org>
    Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
    ---
    Documentation/admin-guide/kernel-parameters.txt | 4 ++++
    virt/kvm/arm/vgic/vgic-v3.c | 14 ++++++++++++++
    2 files changed, 18 insertions(+)

    diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
    index 05496622b4ef..93c8fff399eb 100644
    --- a/Documentation/admin-guide/kernel-parameters.txt
    +++ b/Documentation/admin-guide/kernel-parameters.txt
    @@ -1874,6 +1874,10 @@
    [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)
    diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c
    index 96ea597db0e7..405733678c2f 100644
    --- a/virt/kvm/arm/vgic/vgic-v3.c
    +++ b/virt/kvm/arm/vgic/vgic-v3.c
    @@ -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)
    {
    @@ -459,6 +460,12 @@ 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
    @@ -478,6 +485,13 @@ 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;
    --
    2.11.0
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