The guest should be checking this before trying to use performance monitors, for example.
Signed-off-by: Rusty Russell <[email protected]> diff --git a/arch/arm/kvm/emulate.c b/arch/arm/kvm/emulate.c index e356d1c..c07eb2b 100644 --- a/arch/arm/kvm/emulate.c +++ b/arch/arm/kvm/emulate.c @@ -238,6 +238,15 @@ static bool read_l2ctlr(struct kvm_vcpu *vcpu, return true; } +static bool read_id_dfr0(struct kvm_vcpu *vcpu, + const struct coproc_params *p, + unsigned long arg) +{ + /* We support no performance monitors (27-24 = b1111) and no debug */ + *vcpu_reg(vcpu, p->Rt1) = 0x0F000000; + return true; +} + static bool access_cp15_reg(struct kvm_vcpu *vcpu, const struct coproc_params *p, unsigned long cp15_reg) @@ -277,6 +286,9 @@ struct coproc_emulate { #define RW .is_w = DF static const struct coproc_emulate coproc_emulate[] = { + /* ID_DFR0 (guest asks what PMU/debug we support) */ + { CRn( 0), CRm( 1), Op1( 0), Op2( 2), is32, READ, read_id_dfr0}, + /* * L2CTLR access: * -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
