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Subject: Re: [PATCH v3 6/8] admin: Add theory of operation for write recording commands
On Thu, Nov 16, 2023 at 12:51:40AM -0500, Michael S. Tsirkin wrote: > On Thu, Nov 16, 2023 at 05:29:54AM +0000, Parav Pandit wrote: > > We should expose a limit of the device in the proposed WRITE_RECORD_CAP_QUERY command, that how much range it can track. > > So that future provisioning framework can use it. > > > > I will cover this in v5 early next week. > > I do worry about how this can even work though. If you want a generic > device you do not get to dictate how much memory VM has. > > Aren't we talking bit per page? With 1TByte of memory to track -> > 256Gbit -> 32Gbit -> 8Gbyte per VF? Ugh. Actually of course: With 1TByte of memory to track -> 256Mbit -> 32Mbit -> 8Mbyte per VF 8Gbyte per *PF* with 1K VFs. > And you happily say "we'll address this in the future" while at the same > time fighting tooth and nail against adding single bit status registers > because scalability? > > > I have a feeling doing this completely theoretical like this is problematic. > Maybe you have it all laid out neatly in your head but I suspect > not all of TC can picture it clearly enough based just on spec text. > > We do sometimes ask for POC implementation in linux / qemu to > demonstrate how things work before merging code. We skipped this > for admin things so far but I think it's a good idea to start doing > it here. > > What makes me pause a bit before saying please do a PoC is > all the opposition that seems to exist to even using admin > commands in the 1st place. I think once we finally stop > arguing about whether to use admin commands at all then > a PoC will be needed before merging. > > > -- > MST
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