On Fri, Jun 26, 2020 at 01:42:27PM +0000, Wei Liu wrote: > On Thu, Jun 25, 2020 at 11:37:20AM -0400, Andres Beltran wrote: > > From: Andres Beltran (Microsoft) <lkmlabelt@xxxxxxxxx> > > > > Currently, VMbus drivers use pointers into guest memory as request IDs > > for interactions with Hyper-V. To be more robust in the face of errors > > or malicious behavior from a compromised Hyper-V, avoid exposing > > guest memory addresses to Hyper-V. Also avoid Hyper-V giving back a > > bad request ID that is then treated as the address of a guest data > > structure with no validation. Instead, encapsulate these memory > > addresses and provide small integers as request IDs. > > > > The first patch creates the definitions for the data structure, provides > > helper methods to generate new IDs and retrieve data, and > > allocates/frees the memory needed for vmbus_requestor. > > > > The second and third patches make use of vmbus_requestor to send request > > IDs to Hyper-V in storvsc and netvsc respectively. > > > > Per my understanding, this new data structure is per-channel, so it > won't introduce contention on the lock in multi-queue scenario. Have you > done any testing to confirm there is no severe performance regression? I did run some performance tests using our dev pipeline (storage and network workloads). I did not find regressions w.r.t. baseline. Andrea
