Virtualization Software Development

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Finding out if "Unrestricted Guest" supported at runtime

Hi there,

is there an option to find out at runtime (e.g. with means of CPUID or something else) if the "Unrestricted Guest" feature is supported on the CPU? In the developer manual I can only find which flags control the UG feature (i.e. "25.8. Unrestricted Guests" ff), but I don't see anywhere how to determine if the feature is actually supported. Historically, at which processor family was "Unrestricted Guest" introduced? Is there a easy way to tell which processors contian the feature from the timeline?

Best regards,
Joe

Is it possible to use Intel NPT to do cross ISA memory translation?

O.K., I know Intel virtualization techniques are used to help better performance for same ISA, i.e., x86, virtualization. But I am curious if we can use NPT to help us to do cross ISA memory translation. For example, I can run a ARM guest on x86 host by using QEMU, but the memory translation inside QEMU is pure software. Is it possible to leverage underlying hardware to speedup the translation?

Any comments are welcome. Thanks!

Performance Counter Uncore issues

Trying to implement performance counting on my bare-metal hypervisor. Particularly I am interested in the L3 cache misses for an intel i7 06_1Eh processor. There are two methods that should give me the same result, the non-architectural MEM_LOAD_RETIRED.L3_MISS performance event and the uncore UNC_l3_MISS.ANY performance event. I assign either of these events to the IA32_PERFEVTSEL0, set the USR, OS, and EN bits, or the MSR_UNCORE_PERFEVTSEL0 setting the EN bits. And then I set their respective enable bits in their respective global performance control MSRs.

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