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KVM: arm64: Enable GICv3 Group-0 sysreg trapping via command-line

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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 <agraf@suse.de>
Acked-by: David Daney <david.daney@cavium.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
This commit is contained in:
Marc Zyngier 2017-06-09 12:49:46 +01:00
parent abf55766f7
commit e23f62f76a
2 changed files with 10 additions and 0 deletions
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4
Documentation/admin-guide/kernel-parameters.txt
View File

@ -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

6
virt/kvm/arm/vgic/vgic-v3.c
View File

@ -438,6 +438,12 @@ out:
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);