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authorMarc Zyngier <marc.zyngier@arm.com>2017-06-09 12:49:53 +0100
committerMarc Zyngier <marc.zyngier@arm.com>2017-06-15 09:45:06 +0100
commitff89511ef29b794d6a9c6b62f5ea76fc013cdae7 (patch)
tree35d385aa1febf5979d292ea3b47b95799a82cf2f /virt
parent6293d6514d6b0945210e15edcecc71d99cfca97c (diff)
downloadlinux-ff89511ef29b794d6a9c6b62f5ea76fc013cdae7.tar.bz2
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 <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')
-rw-r--r--virt/kvm/arm/vgic/vgic-v3.c11
1 files changed, 10 insertions, 1 deletions
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);
}