[PATCH v7 06/19] KVM: ARM64: Add access handler for PMCEID0 and PMCEID1 register

Marc Zyngier
2015-12-15T14:20:14Z

On 15/12/15 08:49, Shannon Zhao wrote:
> From: Shannon Zhao <shannon.zhao@linaro.org>
>
> Add access handler which gets host value of PMCEID0 or PMCEID1 when
> guest access these registers. Writing action to PMCEID0 or PMCEID1 is
> ignored.
>
> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> ---
> arch/arm64/kvm/sys_regs.c | 26 ++++++++++++++++++++++----
> 1 file changed, 22 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> index c21f91b..e043224 100644
> --- a/arch/arm64/kvm/sys_regs.c
> +++ b/arch/arm64/kvm/sys_regs.c
> @@ -486,6 +486,24 @@ static bool access_pmselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
> return true;
> }
>
> +static bool access_pmceid(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
> + const struct sys_reg_desc *r)
> +{
> + u64 pmceid;
> +
> + if (p->is_write)
> + return write_to_read_only(vcpu, p);

This register in UNDEFINED in that case. You should call
kvm_inject_undefined() for that vcpu and return.

Thanks,

M.
--
Jazz is not dead. It just smells funny...