>>On 5/3/2018 9:54 PM, Marc Zyngier wrote:
On 03/05/18 12:12, Kalra, Ashish wrote:
The reason for the problem you're seeing is probably that the
constraints are not quite right. Here, x0 is not simply clobbered, but
is actively written to in the middle of the sequence (it is
The reason for the problem you're seeing is probably that the
constraints are not quite right. Here, x0 is not simply clobbered, but
is actively written to in the middle of the sequence (it is at least an
early clobber). It is also, I assume, a result from the hypercall, so it
cannot simply be
Hello Shih-Wei,
This exception is probably due to a bug in the hvc_test (hvc call) code,
and there is a generic bug in the hvc test code.
In the function hvc_test(), local variables c1, c2 get mapped to
registers (typically x1 & x2) and those are "clobbered" across the hvc
call, hence, c1 gets
Hello Shih-Wei,
This "micro" test is really useful for micro-architectural performance
measurement of KVM/ARM.
But, to get more accurate cycle counts, it will be preferable to compute
counter read (and isb) overhead and deduct it from the final cycle
count, something like this :
+static unsigne
Hello Shih-Wei,
This "micro" test is really useful for micro-architectural performance
measurement of KVM/ARM.
But, to get more accurate cycle counts, it will be preferable to compute
counter read (and isb) overhead and deduct it from the final cycle
count, something like this :
+static unsigne
Hello Shih-Wei,
This "micro" test is really useful for micro-architectural performance
measurement of KVM/ARM.
But, to get slightly more accurate cycle counts, it will be preferable
to compute counter read (and isb) overhead and deduct it from the final
cycle count, something like this :
+
.
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
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
thi
