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[RFC,kvmtool,3/3] riscv: Add Sstc extension support

Message ID 20220304101023.764631-4-atishp@rivosinc.com
State Superseded
Headers show
Series Add Sstc extension support | expand

Commit Message

Atish Kumar Patra March 4, 2022, 10:10 a.m. UTC 
Sstc extension allows the guest OS to program the timer directly without
relying on the SBI call. The kernel detects the presence of Sstc extnesion
from the riscv,isa DT property. Add the Sstc extension to the device tree
if it is supported by the host.

Signed-off-by: Atish Patra <atishp@rivosinc.com>
---
 riscv/fdt.c             | 1 +
 riscv/include/asm/kvm.h | 1 +
 2 files changed, 2 insertions(+)
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Patch

diff --git a/riscv/fdt.c b/riscv/fdt.c
index 2e69bd219fe5..a2bea5e17749 100644
--- a/riscv/fdt.c
+++ b/riscv/fdt.c
@@ -18,6 +18,7 @@  struct isa_ext_info {
 };
 
 struct isa_ext_info isa_info_arr[] = {
+	{"sstc", KVM_RISCV_ISA_EXT_SSTC},
 };
 
 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 e01678aa2a55..c7c313272c0b 100644
--- a/riscv/include/asm/kvm.h
+++ b/riscv/include/asm/kvm.h
@@ -97,6 +97,7 @@  enum KVM_RISCV_ISA_EXT_ID {
 	KVM_RISCV_ISA_EXT_H,
 	KVM_RISCV_ISA_EXT_I,
 	KVM_RISCV_ISA_EXT_M,
+	KVM_RISCV_ISA_EXT_SSTC,
 	KVM_RISCV_ISA_EXT_MAX,
 };