From mboxrd@z Thu Jan 1 00:00:00 1970 From: marc.zyngier@arm.com (Marc Zyngier) Date: Fri, 9 Jun 2017 12:49:46 +0100 Subject: [PATCH v3 17/27] KVM: arm64: Enable GICv3 Group-0 sysreg trapping via command-line In-Reply-To: <20170609114956.25963-1-marc.zyngier@arm.com> References: <20170609114956.25963-1-marc.zyngier@arm.com> Message-ID: <20170609114956.25963-18-marc.zyngier@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Now that we're able to safely handle Group-0 sysreg access, let's give the user the opportunity to enable it by passing a specific command-line option (vgic_v3.group0_trap). Tested-by: Alexander Graf Acked-by: David Daney Signed-off-by: Marc Zyngier --- Documentation/admin-guide/kernel-parameters.txt | 4 ++++ virt/kvm/arm/vgic/vgic-v3.c | 6 ++++++ 2 files changed, 10 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 42fe395be6c8..88bdc421351f 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1829,6 +1829,10 @@ for all guests. Default is 1 (enabled) if in 64-bit or 32-bit PAE mode. + kvm-arm.vgic_v3_group0_trap= + [KVM,ARM] Trap guest accesses to GICv3 group-0 + system registers + kvm-arm.vgic_v3_group1_trap= [KVM,ARM] Trap guest accesses to GICv3 group-1 system registers diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c index 06773b985b4e..e0e50ca547de 100644 --- a/virt/kvm/arm/vgic/vgic-v3.c +++ b/virt/kvm/arm/vgic/vgic-v3.c @@ -419,6 +419,12 @@ int vgic_v3_map_resources(struct kvm *kvm) DEFINE_STATIC_KEY_FALSE(vgic_v3_cpuif_trap); +static int __init early_group0_trap_cfg(char *buf) +{ + return strtobool(buf, &group0_trap); +} +early_param("kvm-arm.vgic_v3_group0_trap", early_group0_trap_cfg); + static int __init early_group1_trap_cfg(char *buf) { return strtobool(buf, &group1_trap); -- 2.11.0