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| author | Marc Zyngier <marc.zyngier@arm.com> | 2017-06-09 12:49:41 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2017-06-15 09:45:01 +0100 |
| commit | 182936eee7e6b1956881b51bc534a541dc71a101 (patch) | |
| tree | 1d6bbaea62d09cdae15f1962fc57112a3e3650d4 /virt/kvm/arm | |
| parent | 9c7bfc288c71068ab323b802dba2eb87fd08b127 (diff) | |
| download | lwn-182936eee7e6b1956881b51bc534a541dc71a101.tar.gz lwn-182936eee7e6b1956881b51bc534a541dc71a101.zip | |
KVM: arm64: Enable GICv3 Group-1 sysreg trapping via command-line
Now that we're able to safely handle Group-1 sysreg access, let's
give the user the opportunity to enable it by passing a specific
command-line option (vgic_v3.group1_trap).
Tested-by: Alexander Graf <agraf@suse.de>
Acked-by: David Daney <david.daney@cavium.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
Diffstat (limited to 'virt/kvm/arm')
| -rw-r--r-- | virt/kvm/arm/vgic/vgic-v3.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c index 722bdebdfbb5..4b2b62b73470 100644 --- a/virt/kvm/arm/vgic/vgic-v3.c +++ b/virt/kvm/arm/vgic/vgic-v3.c @@ -435,6 +435,12 @@ out: DEFINE_STATIC_KEY_FALSE(vgic_v3_cpuif_trap); +static int __init early_group1_trap_cfg(char *buf) +{ + return strtobool(buf, &group1_trap); +} +early_param("kvm-arm.vgic_v3_group1_trap", early_group1_trap_cfg); + /** * vgic_v3_probe - probe for a GICv3 compatible interrupt controller in DT * @node: pointer to the DT node @@ -486,6 +492,11 @@ int vgic_v3_probe(const struct gic_kvm_info *info) if (kvm_vgic_global_state.vcpu_base == 0) kvm_info("disabling GICv2 emulation\n"); + if (group1_trap) { + kvm_info("GICv3 sysreg trapping enabled (reduced performance)\n"); + static_branch_enable(&vgic_v3_cpuif_trap); + } + kvm_vgic_global_state.vctrl_base = NULL; kvm_vgic_global_state.type = VGIC_V3; kvm_vgic_global_state.max_gic_vcpus = VGIC_V3_MAX_CPUS; |