[Qemu-devel] [PATCH v1 20/27] target/riscv: Disable guest FP support based on backgrond status

Alistair Francis posted 27 patches 6 years, 8 months ago
[Qemu-devel] [PATCH v1 20/27] target/riscv: Disable guest FP support based on backgrond status
Posted by Alistair Francis 6 years, 8 months ago
When the Hypervisor extension is in use we only enable floating point
support when both status and bsstatus have enabled floating point
support.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---
 target/riscv/cpu_helper.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index d1f73396e4..b009049cc4 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -193,6 +193,9 @@ void riscv_cpu_set_force_hs_excep(CPURISCVState *env, bool enable)
 bool riscv_cpu_fp_enabled(CPURISCVState *env)
 {
     if (env->mstatus & MSTATUS_FS) {
+        if (riscv_cpu_virt_enabled(env) && !(env->bsstatus & MSTATUS_FS)) {
+            return false;
+        }
         return true;
     }
 
-- 
2.21.0