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KVM: arm64: Don't log IMP DEF sysreg traps 

We don't intend to support IMPLEMENATION DEFINED system registers, but
have to trap them (and emulate them as UNDEFINED). These traps aren't
interesting to the system administrator or to the KVM developers, so
let's not bother logging when we do so.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20191205180652.18671-3-mark.rutland@arm.com
This commit is contained in:
Mark Rutland 2019-12-05 18:06:52 +00:00 committed by Marc Zyngier
parent bf4b96bb54
commit 54ad68b777
1 changed files with 8 additions and 0 deletions
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8
arch/arm64/kvm/sys_regs.c
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@ -2229,6 +2229,12 @@ int kvm_handle_cp14_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
NULL, 0);
}
static bool is_imp_def_sys_reg(struct sys_reg_params *params)
{
// See ARM DDI 0487E.a, section D12.3.2
return params->Op0 == 3 && (params->CRn & 0b1011) == 0b1011;
}
static int emulate_sys_reg(struct kvm_vcpu *vcpu,
struct sys_reg_params *params)
{
@ -2244,6 +2250,8 @@ static int emulate_sys_reg(struct kvm_vcpu *vcpu,
if (likely(r)) {
perform_access(vcpu, params, r);
} else if (is_imp_def_sys_reg(params)) {
kvm_inject_undefined(vcpu);
} else {
print_sys_reg_msg(params,
"Unsupported guest sys_reg access at: %lx [%08lx]\n",