kvm-unit-tests arm ptimer test

[Kalra, Ashish]

Hello,

I have a general question on the ptimer test for KVM unit tests for the 
ARM/ARM64 platform, as the guest is only allowed to access to the 
physical counter and access to the physical timer is not allowed for the 
guest (CNTHCTL.EL1PCTEN is set and CNTHCTL.EL1PCEN is clear), so how is 
this ptimer test supposed to pass :

For example, in this test, reading CNTP_{CTL/CVAL}_EL0 will always cause 
exceptions while running in guest in the following function :

static void print_ptimer_info(void)
{
        printf("CNTPCT_EL0   : 0x%016lx\n", read_sysreg(cntpct_el0));
        printf("CNTP_CTL_EL0 : 0x%016lx\n", read_sysreg(cntp_ctl_el0));
        printf("CNTP_CVAL_EL0: 0x%016lx\n", read_sysreg(cntp_cval_el0));
}

Thanks,
Ashish
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