On 22/12/15 08:08, Shannon Zhao wrote:
> From: Shannon Zhao <shannon.z...@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
> UNDEFINED.
>
> Signed-off-by: Shannon Zhao <shannon.z...@linaro.org>
> ---
> arch/arm64/kvm/sys_regs.c | 27 +++++++++++++++++++++++----
> 1 file changed, 23 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> index f9985fc..2552db1 100644
> --- a/arch/arm64/kvm/sys_regs.c
> +++ b/arch/arm64/kvm/sys_regs.c
> @@ -486,6 +486,25 @@ 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) {
> + kvm_inject_undefined(vcpu);
Just "return false", which will do the right thing.
> + } else {
> + if (!(p->Op2 & 1))
> + asm volatile("mrs %0, pmceid0_el0\n" : "=r" (pmceid));
> + else
> + asm volatile("mrs %0, pmceid1_el0\n" : "=r" (pmceid));
> +
> + p->regval = pmceid;
> + }
> +
> + return true;
> +}
> +
> /* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */
> #define DBG_BCR_BVR_WCR_WVR_EL1(n) \
> /* DBGBVRn_EL1 */ \
> @@ -688,10 +707,10 @@ static const struct sys_reg_desc sys_reg_descs[] = {
> access_pmselr, reset_unknown, PMSELR_EL0 },
> /* PMCEID0_EL0 */
> { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b110),
> - trap_raz_wi },
> + access_pmceid },
> /* PMCEID1_EL0 */
> { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b111),
> - trap_raz_wi },
> + access_pmceid },
> /* PMCCNTR_EL0 */
> { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b000),
> trap_raz_wi },
> @@ -937,8 +956,8 @@ static const struct sys_reg_desc cp15_regs[] = {
> { Op1( 0), CRn( 9), CRm(12), Op2( 2), trap_raz_wi },
> { Op1( 0), CRn( 9), CRm(12), Op2( 3), trap_raz_wi },
> { Op1( 0), CRn( 9), CRm(12), Op2( 5), access_pmselr },
> - { Op1( 0), CRn( 9), CRm(12), Op2( 6), trap_raz_wi },
> - { Op1( 0), CRn( 9), CRm(12), Op2( 7), trap_raz_wi },
> + { Op1( 0), CRn( 9), CRm(12), Op2( 6), access_pmceid },
> + { Op1( 0), CRn( 9), CRm(12), Op2( 7), access_pmceid },
> { Op1( 0), CRn( 9), CRm(13), Op2( 0), trap_raz_wi },
> { Op1( 0), CRn( 9), CRm(13), Op2( 1), trap_raz_wi },
> { Op1( 0), CRn( 9), CRm(13), Op2( 2), trap_raz_wi },
>
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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