The guest should be checking this before trying to use performance monitors,
for example.
Signed-off-by: Rusty Russell <rusty.russell@xxxxxxxxxx>
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:
*
--
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