Re: kvm-unit-tests arm ptimer test

2017-08-10 Thread Andrew Jones 
On Thu, Aug 10, 2017 at 12:33:08PM +0530, Kalra, Ashish wrote:
> 
> Just realized that KVM/ARM now supports EL1 physical timer emulation
> for guests and had a look at the patch set that enables VMs to use the EL1
> physical timer through trap-and-emulate for arm64. I am using an
> older KVM release which is causing guest termination on physical
> timer access.

I had some proposed changes that would skip (output SKIP) the physical
timer tests when running on old KVM. We didn't bother with them, though,
because kvm-unit-tests is really meant to always test the latest KVM.
But, now that I see those changes would have saved you some grief, I
guess we should have gone ahead and applied them. I'll send a patch
later today.

Thanks,
drew
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Re: kvm-unit-tests arm ptimer test

2017-08-10 Thread Kalra, Ashish 


Just realized that KVM/ARM now supports EL1 physical timer emulation
for guests and had a look at the patch set that enables VMs to use the 
EL1 physical timer through trap-and-emulate for arm64. I am using an

older KVM release which is causing guest termination on physical
timer access.

Thanks,
Ashish

On 8/10/2017 3:01 AM, Kalra, Ashish wrote:

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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kvm-unit-tests arm ptimer test

2017-08-09 Thread 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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