riscv vmm: add SSTC extension check.

Check if RISC-V SSTC is available and advertise to the guest.

This is needed for Eswin EIC7700 that does not include SSTC.

As we don't have a mechanism for reporting extension presence
from the kernel to userspace, then use vm_cap_type for now.

Reviewed by: mhorne, markj
Differential Revision: https://reviews.freebsd.org/D48058

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/libvmmapi/riscv/vmmapi_machdep.c b/lib/libvmmapi/riscv/vmmapi_machdep.c
index 9c70185942c9..4da2fb909f61 100644
--- a/lib/libvmmapi/riscv/vmmapi_machdep.c
+++ b/lib/libvmmapi/riscv/vmmapi_machdep.c
@@ -40,6 +40,7 @@
 #include "internal.h"
 
 const char *vm_capstrmap[] = {
+	[VM_CAP_SSTC] = "sstc",
 	[VM_CAP_MAX] = NULL,
 };