Per Anup Patel in [*]:

 > Currently, we only support running rv64 guest on rv64 host
 > and rv32 guest on rv32 host.
 >
 > In the future, we might support running rv32 guest on rv64
 > host but as of now we don't see a strong push for it.

Therefore, when only using the KVM accelerator it is pointless
to build qemu-system-riscv32 on a rv64 host (or qemu-system-riscv64
on a rv32 host). Restrict meson to only build the correct binary,
avoiding to waste ressources building unusable code.

[*] https://lore.kernel.org/qemu-devel/CAAhSdy2JeRHeeoEc1XKQhPO3aDz4YKeyQsPT4S8yKJcYTA+AiQ@mail.gmail.com/

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 meson.build | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/meson.build b/meson.build
index 649de244c6..a3ab614235 100644
--- a/meson.build
+++ b/meson.build
@@ -110,8 +110,10 @@ elif cpu in ['ppc', 'ppc64']
   kvm_targets = ['ppc-softmmu', 'ppc64-softmmu']
 elif cpu in ['mips', 'mips64']
   kvm_targets = ['mips-softmmu', 'mipsel-softmmu', 'mips64-softmmu', 'mips64el-softmmu']
-elif cpu in ['riscv32', 'riscv64']
-  kvm_targets = ['riscv32-softmmu', 'riscv64-softmmu']
+elif cpu in ['riscv32']
+  kvm_targets = ['riscv32-softmmu']
+elif cpu in ['riscv64']
+  kvm_targets = ['riscv64-softmmu']
 else
   kvm_targets = []
 endif
-- 
2.38.1