Questions about kvm msr read/write policy
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Paolo Bonzini
maintainerQuoted 10 lines · Shuai Ruan
Using read msr as an example, if the msr is not handled in kvm(not recognised by kvm) and
ignore_msrsclear, kvm will inject gp into guest os(if I understand this correctly).My question is what problem will cause(or in which situation will cause problem) if read msr (unhandled msr) just return 0 instead of injdecting gp fault into guest os?
The same question with write msr, if just ignore this write , what will happen?
It depends on the MSR and on the guest OS. Usually 0 is treated as an error or as "feature not present" so it just works.
Paolo