[PATCH kvmtool 1/1] riscv: Add zihintpause extension support

[Mayuresh Chitale <mchitale@ventanamicro.com>]

The zihintpause extension allows software to use the PAUSE instruction to
reduce energy consumption while executing spin-wait code sequences. Add the
zihintpause extension to the device tree if it is supported by the host.

Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
---
 riscv/fdt.c             | 2 ++
 riscv/include/asm/kvm.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/riscv/fdt.c b/riscv/fdt.c
index e3d7717..7997edc 100644
--- a/riscv/fdt.c
+++ b/riscv/fdt.c
@@ -19,6 +19,8 @@ struct isa_ext_info {
 struct isa_ext_info isa_info_arr[] = {
 	{"svpbmt", KVM_RISCV_ISA_EXT_SVPBMT},
 	{"sstc", KVM_RISCV_ISA_EXT_SSTC},
+	{"Zihintpause", KVM_RISCV_ISA_EXT_ZIHINTPAUSE},
+
 };
 
 static void dump_fdt(const char *dtb_file, void *fdt)
diff --git a/riscv/include/asm/kvm.h b/riscv/include/asm/kvm.h
index 7351417..f6f7963 100644
--- a/riscv/include/asm/kvm.h
+++ b/riscv/include/asm/kvm.h
@@ -98,6 +98,7 @@ enum KVM_RISCV_ISA_EXT_ID {
 	KVM_RISCV_ISA_EXT_M,
 	KVM_RISCV_ISA_EXT_SVPBMT,
 	KVM_RISCV_ISA_EXT_SSTC,
+	KVM_RISCV_ISA_EXT_ZIHINTPAUSE,
 	KVM_RISCV_ISA_EXT_MAX,
 };
 
-- 
2.34.1