On Thu, Aug 01 2024 at 16:14, Michael Kelley wrote:

From: Thomas Gleixner <redacted> Sent: Thursday, August 1, 2024 7:21 AM
FWIW, in Hyper-V guests with the Hyper-V quirk removed, tglx's new
sequence does *not* stop the PIT. But this sequence does:

outb_p(0x30, PIT_MODE);
outb_p(0xff, PIT_CH0);
outb_p(0xff, PIT_CH0);

outb_p(0x30, PIT_MODE);
outb_p(0xff, PIT_CH0);

That works on bare metal too

I don't have a convenient way to test my sequence on KVM.

But still fails in KVM

Thanks,

        tglx