RISC-V: KVM: Expose Zicboz to the guest

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Guests may use the cbo.zero instruction when the CPU has the Zicboz
extension and the hypervisor sets henvcfg.CBZE.

Add Zicboz support for KVM guests which may be enabled and
disabled from KVM userspace using the ISA extension ONE_REG API.

Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20230224162631.405473-9-ajones@ventanamicro.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

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Andrew Jones 2023-02-24 17:26:31 +01:00 • committed by Palmer Dabbelt

parent 665fd88624

commit b20f67994f

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arch/riscv/include/uapi/asm/kvm.h

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4

arch/riscv/kvm/vcpu.c

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