On Fri, Feb 21, 2025 at 04:53:26PM +0000, Peter Maydell wrote: > On Fri, 21 Feb 2025 at 14:02, Wei Liu <li...@linux.microsoft.com> wrote: > > > > Hi, > > > > Microsoft's Linux Systems Group developed a Linux driver for the Microsoft > > Hypervisor (MSHV for short). The driver is being upstreamed. The first > > supported VMM is Cloud Hypervisor. QEMU will be the second supported > > VMM. > > > > The plan is to write an mshv accelerator in QEMU. The accelerator is still > > in > > the works. > > > > MSHV doesn't emulate instructions. VMMs are supposed to bring their own > > instruction emulator. The path we've chosen is to reuse what's already in > > QEMU. > > The instruction emulator in HVF looks good for what we need. > > > > This patch series attempts to make the instruction emulator in HVF a common > > component for the i386 target. It removes HVF specific code by either using > > a > > set of hooks or moving it to better locations. The new incoming MSHV > > accelerator will implement the hooks, and where necessary, enhance the > > emulator > > and / or add new hooks. > > If you want to make the hvf decoder more widely used you might want > to look at this old patch to it that was never applied (issues in > code review not addressed by the submitter): > > https://lore.kernel.org/qemu-devel/CAFEAcA8yaBOD3KXc-DY94oqzC5wkCENPkePgVCybqR=9nmd...@mail.gmail.com/ > > which is trying to fix a problem where an overlong string of > prefix bytes causes the decoder to misbehave. >
Thanks for the information. > (PS: if in the future you should ever find yourself wanting to do an > equivalent "decode loads/stores the hypervisor doesn't handle" > for Arm, use decodetree, not a hand-rolled decoder...) > Noted. Yep, we have plans to add ARM64 support in the future. Thanks, Wei. > thanks > -- PMM
