[PATCH] target/riscv/tcg/tcg-cpu.c: consider MISA bit choice in implied rule

[PATCH] target/riscv/tcg/tcg-cpu.c: consider MISA bit choice in implied rule

[Daniel Henrique Barboza]

Gitlab issue [1] reports a misleading error when trying to run a 'rv64'
cpu with 'zfinx' and without 'f':

$ ./build/qemu-system-riscv64 -nographic -M virt -cpu rv64,zfinx=true,f=false
qemu-system-riscv64: Zfinx cannot be supported together with F extension

The user explicitly disabled F and the error message mentions a conflict
with Zfinx and F.

The problem isn't the error reporting, but the logic used when applying
the implied ZFA rule that enables RVF unconditionally, without honoring
user choice (i.e. keep F disabled).

Change cpu_enable_implied_rule() to check if the user deliberately
disabled a MISA bit. In this case we shouldn't either re-enable the bit
nor apply any implied rules related to it.

After this change the error message now shows:

$ ./build/qemu-system-riscv64 -nographic -M virt -cpu rv64,zfinx=true,f=false
qemu-system-riscv64: Zfa extension requires F extension

Disabling 'zfa':

$ ./build/qemu-system-riscv64 -nographic -M virt -cpu rv64,zfinx=true,f=false,zfa=false
qemu-system-riscv64: D extension requires F extension

And finally after disabling 'd':

$ ./build/qemu-system-riscv64 -nographic -M virt -cpu rv64,zfinx=true,f=false,zfa=false,d=false
(OpenSBI boots ...)

[1] https://gitlab.com/qemu-project/qemu/-/issues/2486

Cc: Frank Chang <frank.chang@sifive.com>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2486
Fixes: 047da861f9 ("target/riscv: Introduce extension implied rule helpers")
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
---
 target/riscv/tcg/tcg-cpu.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/target/riscv/tcg/tcg-cpu.c b/target/riscv/tcg/tcg-cpu.c
index b8814ab753..dea8ab7a43 100644
--- a/target/riscv/tcg/tcg-cpu.c
+++ b/target/riscv/tcg/tcg-cpu.c
@@ -778,11 +778,18 @@ static void cpu_enable_implied_rule(RISCVCPU *cpu,
     if (!enabled) {
         /* Enable the implied MISAs. */
         if (rule->implied_misa_exts) {
-            riscv_cpu_set_misa_ext(env,
-                                   env->misa_ext | rule->implied_misa_exts);
-
             for (i = 0; misa_bits[i] != 0; i++) {
                 if (rule->implied_misa_exts & misa_bits[i]) {
+                    /*
+                     * If the user disabled the misa_bit do not re-enable it
+                     * and do not apply any implied rules related to it.
+                     */
+                    if (cpu_misa_ext_is_user_set(misa_bits[i]) &&
+                        !(env->misa_ext & misa_bits[i])) {
+                        continue;
+                    }
+
+                    riscv_cpu_set_misa_ext(env, env->misa_ext | misa_bits[i]);
                     ir = g_hash_table_lookup(misa_ext_implied_rules,
                                              GUINT_TO_POINTER(misa_bits[i]));
 
-- 
2.45.2

Re: [PATCH] target/riscv/tcg/tcg-cpu.c: consider MISA bit choice in implied rule

[Alistair Francis]

On Sun, Aug 25, 2024 at 3:34 AM Daniel Henrique Barboza
<dbarboza@ventanamicro.com> wrote:
>
> Gitlab issue [1] reports a misleading error when trying to run a 'rv64'
> cpu with 'zfinx' and without 'f':
>
> $ ./build/qemu-system-riscv64 -nographic -M virt -cpu rv64,zfinx=true,f=false
> qemu-system-riscv64: Zfinx cannot be supported together with F extension
>
> The user explicitly disabled F and the error message mentions a conflict
> with Zfinx and F.
>
> The problem isn't the error reporting, but the logic used when applying
> the implied ZFA rule that enables RVF unconditionally, without honoring
> user choice (i.e. keep F disabled).
>
> Change cpu_enable_implied_rule() to check if the user deliberately
> disabled a MISA bit. In this case we shouldn't either re-enable the bit
> nor apply any implied rules related to it.
>
> After this change the error message now shows:
>
> $ ./build/qemu-system-riscv64 -nographic -M virt -cpu rv64,zfinx=true,f=false
> qemu-system-riscv64: Zfa extension requires F extension
>
> Disabling 'zfa':
>
> $ ./build/qemu-system-riscv64 -nographic -M virt -cpu rv64,zfinx=true,f=false,zfa=false
> qemu-system-riscv64: D extension requires F extension
>
> And finally after disabling 'd':
>
> $ ./build/qemu-system-riscv64 -nographic -M virt -cpu rv64,zfinx=true,f=false,zfa=false,d=false
> (OpenSBI boots ...)
>
> [1] https://gitlab.com/qemu-project/qemu/-/issues/2486
>
> Cc: Frank Chang <frank.chang@sifive.com>
> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2486
> Fixes: 047da861f9 ("target/riscv: Introduce extension implied rule helpers")
> Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>  target/riscv/tcg/tcg-cpu.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
>
> diff --git a/target/riscv/tcg/tcg-cpu.c b/target/riscv/tcg/tcg-cpu.c
> index b8814ab753..dea8ab7a43 100644
> --- a/target/riscv/tcg/tcg-cpu.c
> +++ b/target/riscv/tcg/tcg-cpu.c
> @@ -778,11 +778,18 @@ static void cpu_enable_implied_rule(RISCVCPU *cpu,
>      if (!enabled) {
>          /* Enable the implied MISAs. */
>          if (rule->implied_misa_exts) {
> -            riscv_cpu_set_misa_ext(env,
> -                                   env->misa_ext | rule->implied_misa_exts);
> -
>              for (i = 0; misa_bits[i] != 0; i++) {
>                  if (rule->implied_misa_exts & misa_bits[i]) {
> +                    /*
> +                     * If the user disabled the misa_bit do not re-enable it
> +                     * and do not apply any implied rules related to it.
> +                     */
> +                    if (cpu_misa_ext_is_user_set(misa_bits[i]) &&
> +                        !(env->misa_ext & misa_bits[i])) {
> +                        continue;
> +                    }
> +
> +                    riscv_cpu_set_misa_ext(env, env->misa_ext | misa_bits[i]);
>                      ir = g_hash_table_lookup(misa_ext_implied_rules,
>                                               GUINT_TO_POINTER(misa_bits[i]));
>
> --
> 2.45.2
>
>

Re: [PATCH] target/riscv/tcg/tcg-cpu.c: consider MISA bit choice in implied rule

[Alistair Francis]

On Sun, Aug 25, 2024 at 3:34 AM Daniel Henrique Barboza
<dbarboza@ventanamicro.com> wrote:
>
> Gitlab issue [1] reports a misleading error when trying to run a 'rv64'
> cpu with 'zfinx' and without 'f':
>
> $ ./build/qemu-system-riscv64 -nographic -M virt -cpu rv64,zfinx=true,f=false
> qemu-system-riscv64: Zfinx cannot be supported together with F extension
>
> The user explicitly disabled F and the error message mentions a conflict
> with Zfinx and F.
>
> The problem isn't the error reporting, but the logic used when applying
> the implied ZFA rule that enables RVF unconditionally, without honoring
> user choice (i.e. keep F disabled).
>
> Change cpu_enable_implied_rule() to check if the user deliberately
> disabled a MISA bit. In this case we shouldn't either re-enable the bit
> nor apply any implied rules related to it.
>
> After this change the error message now shows:
>
> $ ./build/qemu-system-riscv64 -nographic -M virt -cpu rv64,zfinx=true,f=false
> qemu-system-riscv64: Zfa extension requires F extension
>
> Disabling 'zfa':
>
> $ ./build/qemu-system-riscv64 -nographic -M virt -cpu rv64,zfinx=true,f=false,zfa=false
> qemu-system-riscv64: D extension requires F extension
>
> And finally after disabling 'd':
>
> $ ./build/qemu-system-riscv64 -nographic -M virt -cpu rv64,zfinx=true,f=false,zfa=false,d=false
> (OpenSBI boots ...)
>
> [1] https://gitlab.com/qemu-project/qemu/-/issues/2486
>
> Cc: Frank Chang <frank.chang@sifive.com>
> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2486
> Fixes: 047da861f9 ("target/riscv: Introduce extension implied rule helpers")
> Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>

Thanks!

Applied to riscv-to-apply.next

Alistair