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RISC-V: KVM: Implement trap & emulate for hpmcounters
As the KVM guests only see the virtual PMU counters, all hpmcounter access should trap and KVM emulates the read access on behalf of guests. Reviewed-by: Anup Patel <anup@brainfault.org> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Signed-off-by: Atish Patra <atishp@rivosinc.com> Signed-off-by: Anup Patel <anup@brainfault.org>
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