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RISC-V: KVM: Allow Guest use Zihintpause extension

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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>
This commit is contained in:
Mayuresh Chitale 2022-10-02 10:18:48 +05:30 committed by Anup Patel
parent bad6ea07c8
commit 0bba48978f
2 changed files with 3 additions and 0 deletions
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1
arch/riscv/include/uapi/asm/kvm.h
View file

@ -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,
};

2
arch/riscv/kvm/vcpu.c
View file

@ -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;