On Fri, Aug 01, 2025, Sean Christopherson wrote:
On Wed, Jul 30, 2025, Dapeng Mi wrote:
On 7/30/2025 8:38 AM, Sean Christopherson wrote:
On Tue, Jul 29, 2025, Dapeng Mi wrote:
BTW, Sean, may I know your plan about the mediated vPMU v5 patch set? Thanks.
I'll get it out this week (hopefully tomorrow).
Thumbs up! Thanks.
I lied, I'm not going to get it out until Monday. Figuring out how to deal with instruction emulation in the fastpath VM-Exit handlers took me longer than I was hoping/expecting.
It's fully tested, and I have all but one changelog written, but I'm out of time for today (I made a stupid goof (inverted a !) that cost me an ~hour today, *sigh*).
Unless I get hit by a meteor, I'll get it out Monday.
*sigh*
Wrong again (fortunately, I didn't get hit by a meteor). Long story short, I revisited (yet again) how to deal with enabling the mediated PMU. I had been doing almost all of my testing with a hack to force-enable a mediated PMU, and when it came time to rip that out, I just couldn't convince myself that requiring userspace to enable KVM_CAP_PMU_CAPABILITY was the best behavior (I especially hated that PMU support would silently disappear).
So, bad news is, v5 isn't happening today. Good news is that I think I figured out a not-awful solution for enabling the mediated PMU. I'll post details (and hopefully v5) tomorrow.