Commit 0bba4897 authored Oct 02, 2022 by Mayuresh Chitale Committed by Anup Patel Oct 02, 2022

RISC-V: KVM: Allow Guest use Zihintpause extension



We should advertise Zihintpause ISA extension to KVM user-space whenever
host supports it. This will allow KVM user-space (i.e. QEMU or KVMTOOL)
to pass on this information to Guest via ISA string.

Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Anup Patel <anup@brainfault.org>

parent bad6ea07

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

+1 −0

Original line number	Diff line number	Diff line
		@@ -99,6 +99,7 @@ enum KVM_RISCV_ISA_EXT_ID {
		KVM_RISCV_ISA_EXT_SVPBMT,
		KVM_RISCV_ISA_EXT_SSTC,
		KVM_RISCV_ISA_EXT_SVINVAL,
		KVM_RISCV_ISA_EXT_ZIHINTPAUSE,
		KVM_RISCV_ISA_EXT_MAX,
		};

arch/riscv/kvm/vcpu.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -54,6 +54,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
		RISCV_ISA_EXT_SVPBMT,
		RISCV_ISA_EXT_SSTC,
		RISCV_ISA_EXT_SVINVAL,
		RISCV_ISA_EXT_ZIHINTPAUSE,
		};

		static unsigned long kvm_riscv_vcpu_base2isa_ext(unsigned long base_ext)
		@@ -89,6 +90,7 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
		case KVM_RISCV_ISA_EXT_M:
		case KVM_RISCV_ISA_EXT_SSTC:
		case KVM_RISCV_ISA_EXT_SVINVAL:
		case KVM_RISCV_ISA_EXT_ZIHINTPAUSE:
		return false;
		default:
		break;