Unhandled exits on MSR read/write (Windows 10 1903) about gbhv HOT 2 CLOSED

On Fri, Oct 25, 2019, 7:51 PM s405 ***@***.***> wrote: Hey, I'm having some trouble getting the hypervisor to run correctly on both virtualized and non-virtualized environments. Both of the test environments are running Windows 10 Pro, build 1903. I wanted to test other builds to see if the issue persists, however, the source doesn't seem to mess with undocumented OS internals and there's already been another issue opened (but closed later on) describing the same issue I'm experiencing. Now, the HvExitHandleUnknownExit function is invoked multiple times by the VM exit handler and it receives exit codes 0x1F and 0x20, which are, as far as I'm aware, exits for MSR read/write. What makes this interesting to me is that the MSR bitmap is both cleared and set before the CPU is subverted ( https://github.com/Gbps/gbhv/blob/master/gbhv/vmcs.c#L515-L527), so I'm not sure what could be causing the exits... I'm not too experienced with VT-x, I've never implemented a type 1 hypervisor by myself, but I've covered most of the basics/theory in SDM volume 3, so pardon if my lack of experience is the cause of the issue :) — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#9?email_source=notifications&email_token=ABKZAKDMNPINIE4Y432HEKLQQOWCVA5CNFSM4JFLP6JKYY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4HUQNPZQ>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABKZAKGDQJRNQM2RFIF4FRDQQOWCVANCNFSM4JFLP6JA> .