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How is virtualization mode achieved in Riscv ?

Hi

I was reading the privilege spec of Riscv. In chapter 21.1 it says the "the current virtualization mode, denoted V, indicates whether the Hart is currently executing in a guest. When V=1, the Hart is either in virtual S-mode(VS-mode) or in virtual U-mode(VU-mode) atop a guest running in VS-mode"
My question is "this V bit" is part of which CSR? how do I monitor this? Or is it implicitly set ?
Through out the hypervisor section it says when V=1 something happens, when V=0 something happens....
But what qualifies as V=1? How do I make V=1.
Any hint much appreciated. Thanks!

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How is virtualization mode achieved in Riscv ?

Hi

I was reading the privilege spec of Riscv. In chapter 21.1 it says the "the current virtualization mode, denoted V, indicates whether the Hart is currently executing in a guest. When V=1, the Hart is either in virtual S-mode(VS-mode) or in virtual U-mode(VU-mode) atop a guest running in VS-mode"
My question is "this V bit" is part of which CSR? how do I monitor this? Or is it implicitly set ?
Through out the hypervisor section it says when V=1 something happens, when V=0 something happens....
But what qualifies as V=1? How do I make V=1.
Any hint much appreciated. Thanks!

https://redd.it/1kyymv6
@r_riscv

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