On Mon, Jul 06, 2015 at 10:17:36AM +0800, shannon.zhao@xxxxxxxxxx wrote:
> From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
>
> Add reset handler which gets host value of PMCEID0_EL0 or PMCEID1_EL0.
> Add access handler which emulates writing and reading PMCEID0_EL0 or
> PMCEID1_EL0 register.
>
> Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
> ---
> arch/arm64/kvm/sys_regs.c | 36 ++++++++++++++++++++++++++++++++++--
> 1 file changed, 34 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> index 69c8c48..1df9ef3 100644
> --- a/arch/arm64/kvm/sys_regs.c
> +++ b/arch/arm64/kvm/sys_regs.c
> @@ -246,6 +246,19 @@ static void reset_pmcr_el0(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
> | (ARMV8_PMCR_MASK & 0xdecafbad);
> }
>
> +static void reset_pmceid(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
> +{
> + u32 pmceid;
> +
> + if (r->reg == PMCEID0_EL0) {
> + asm volatile("mrs %0, pmceid0_el0\n" : "=r" (pmceid));
> + vcpu_sys_reg(vcpu, r->reg) = pmceid;
> + } else {
add /* PMCEID1_EL1 */
> + asm volatile("mrs %0, pmceid1_el0\n" : "=r" (pmceid));
> + vcpu_sys_reg(vcpu, r->reg) = pmceid;
> + }
> +}
> +
> /* PMCR_EL0 accessor. Only called as long as MDCR_EL2.TPMCR is set. */
> static bool access_pmcr(struct kvm_vcpu *vcpu,
> const struct sys_reg_params *p,
> @@ -299,6 +312,25 @@ static bool access_pmselr(struct kvm_vcpu *vcpu,
> return true;
> }
>
> +/* PMCEID0_EL0 and PMCEID1_EL0 accessor. */
> +static bool access_pmceid(struct kvm_vcpu *vcpu,
> + const struct sys_reg_params *p,
> + const struct sys_reg_desc *r)
> +{
> + unsigned long val;
> +
> + if (p->is_write) {
> + return ignore_write(vcpu, p);
> + } else {
> + if (!p->is_aarch32)
> + val = vcpu_sys_reg(vcpu, r->reg);
> + else
> + val = vcpu_cp15(vcpu, r->reg);
> + *vcpu_reg(vcpu, p->Rt) = val;
> + 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 */ \
> @@ -508,10 +540,10 @@ 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, reset_pmceid, PMCEID0_EL0, },
> /* PMCEID1_EL0 */
> { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b111),
> - trap_raz_wi },
> + access_pmceid, reset_pmceid, PMCEID1_EL0, },
> /* PMCCNTR_EL0 */
> { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b000),
> trap_raz_wi },
> --
> 2.1.0
>
same comment wrt. 32-bit table.
-Christoffer
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