target/riscv: Disable guest FP support based on virtual status

When the Hypervisor extension is in use we only enable floating point
support when both status and vsstatus have enabled floating point
support.
Signed-off-by: NAlistair Francis <alistair.francis@wdc.com>
Reviewed-by: NPalmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: NPalmer Dabbelt <palmerdabbelt@google.com>

target/riscv/cpu_helper.c

@@ -99,6 +99,9 @@ bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
 bool riscv_cpu_fp_enabled(CPURISCVState *env)
 {
     if (env->mstatus & MSTATUS_FS) {
+        if (riscv_cpu_virt_enabled(env) && !(env->mstatus_hs & MSTATUS_FS)) {
+            return false;
+        }
         return true;
     }