Hi,
Just a quick comment, haven't actually had time to look through the email/new
patch version with any care.
On 2026-03-03 02:29:06 -0800, Lukas Fittl wrote:
> - Added support for HyperV hypervisor by reading the TSC frequency
> MSR. This allows Azure Linux VMs to work as well, and in my test gives
> a similar speed up with RDTSC like reported on AWS. Only annoyance is
> that to enable it you have to make /dev/cpu/0/msr readable ("setcap
> cap_sys_rawio=ep" on the binary that accesses it + give the user/group
> access to the device file)
I rather doubt that giving even just read access to MSRs to unprivileged
userspace processes is a good idea.
But if we read files anyway, wouldn't just using
/sys/devices/system/cpu/cpu0/cpufreq/base_frequency
work?
Greetings,
Andres Freund
