From ff89511ef29b794d6a9c6b62f5ea76fc013cdae7 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Fri, 9 Jun 2017 12:49:53 +0100 Subject: KVM: arm64: Enable GICv3 common sysreg trapping via command-line Now that we're able to safely handle common sysreg access, let's give the user the opportunity to enable it by passing a specific command-line option (vgic_v3.common_trap). Tested-by: Alexander Graf Acked-by: David Daney Signed-off-by: Marc Zyngier Acked-by: Christoffer Dall Signed-off-by: Christoffer Dall --- virt/kvm/arm/vgic/vgic-v3.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) (limited to 'virt') diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c index 35c00efc110b..91cf8b4f01f1 100644 --- a/virt/kvm/arm/vgic/vgic-v3.c +++ b/virt/kvm/arm/vgic/vgic-v3.c @@ -23,6 +23,7 @@ static bool group0_trap; static bool group1_trap; +static bool common_trap; void vgic_v3_set_underflow(struct kvm_vcpu *vcpu) { @@ -265,6 +266,8 @@ void vgic_v3_enable(struct kvm_vcpu *vcpu) vgic_v3->vgic_hcr |= ICH_HCR_TALL0; if (group1_trap) vgic_v3->vgic_hcr |= ICH_HCR_TALL1; + if (common_trap) + vgic_v3->vgic_hcr |= ICH_HCR_TC; } int vgic_v3_lpi_sync_pending_status(struct kvm *kvm, struct vgic_irq *irq) @@ -450,6 +453,12 @@ static int __init early_group1_trap_cfg(char *buf) } early_param("kvm-arm.vgic_v3_group1_trap", early_group1_trap_cfg); +static int __init early_common_trap_cfg(char *buf) +{ + return strtobool(buf, &common_trap); +} +early_param("kvm-arm.vgic_v3_common_trap", early_common_trap_cfg); + /** * vgic_v3_probe - probe for a GICv3 compatible interrupt controller in DT * @node: pointer to the DT node @@ -508,7 +517,7 @@ int vgic_v3_probe(const struct gic_kvm_info *info) } #endif - if (group0_trap || group1_trap) { + if (group0_trap || group1_trap || common_trap) { kvm_info("GICv3 sysreg trapping enabled (reduced performance)\n"); static_branch_enable(&vgic_v3_cpuif_trap); } -- cgit v1.2.3