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[PATCH v2 3/3] target/riscv: add support for svpbmt extension

Weiwei Li posted 3 patches 4 years, 1 month ago
Maintainers: Bin Meng <bin.meng@windriver.com>, Alistair Francis <alistair.francis@wdc.com>, Palmer Dabbelt <palmer@dabbelt.com>
There is a newer version of this series
[PATCH v2 3/3] target/riscv: add support for svpbmt extension
Posted by Weiwei Li 4 years, 1 month ago 
It uses two PTE bits, but otherwise has no effect on QEMU, since QEMU is sequentially consistent and doesn't model PMAs currently

Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
Tested-by: Heiko Stuebner <heiko@sntech.de>
---
 target/riscv/cpu.c        | 1 +
 target/riscv/cpu.h        | 1 +
 target/riscv/cpu_bits.h   | 3 +++
 target/riscv/cpu_helper.c | 9 ++++++++-
 4 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 77ef0f85fe..743bcfe297 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -649,6 +649,7 @@ static Property riscv_cpu_properties[] = {
     DEFINE_PROP_BOOL("x-j", RISCVCPU, cfg.ext_j, false),
     DEFINE_PROP_BOOL("x-svinval", RISCVCPU, cfg.ext_svinval, false),
     DEFINE_PROP_BOOL("x-svnapot", RISCVCPU, cfg.ext_svnapot, false),
+    DEFINE_PROP_BOOL("x-svpbmt", RISCVCPU, cfg.ext_svpbmt, false),
     /* ePMP 0.9.3 */
     DEFINE_PROP_BOOL("x-epmp", RISCVCPU, cfg.epmp, false),
 
diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index 5dd9e53293..6656b8a4f3 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -317,6 +317,7 @@ struct RISCVCPU {
         bool ext_icsr;
         bool ext_svinval;
         bool ext_svnapot;
+        bool ext_svpbmt;
         bool ext_zfh;
         bool ext_zfhmin;
 
diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
index 1156c941cb..3dae358aa5 100644
--- a/target/riscv/cpu_bits.h
+++ b/target/riscv/cpu_bits.h
@@ -483,7 +483,10 @@ typedef enum {
 #define PTE_A               0x040 /* Accessed */
 #define PTE_D               0x080 /* Dirty */
 #define PTE_SOFT            0x300 /* Reserved for Software */
+#define PTE_RSVD            0x1FC0000000000000 /* Reserved for future use */
+#define PTE_PBMT            0x6000000000000000 /* Page-based memory types */
 #define PTE_N               0x8000000000000000 /* NAPOT translation */
+#define PTE_ATTR            0xFFC0000000000000 /* All attributes bits */
 
 /* Page table PPN shift amount */
 #define PTE_PPN_SHIFT       10
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index e044153986..41d04675b3 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -619,16 +619,23 @@ restart:
             return TRANSLATE_FAIL;
         }
 
-        hwaddr ppn = (pte & ~(target_ulong)PTE_N) >> PTE_PPN_SHIFT;
+        hwaddr ppn = (pte & ~(target_ulong)PTE_ATTR) >> PTE_PPN_SHIFT;
 
         RISCVCPU *cpu = env_archcpu(env);
         if (!cpu->cfg.ext_svnapot && (pte & PTE_N)) {
             return TRANSLATE_FAIL;
+        } else if (!cpu->cfg.ext_svpbmt && (pte & PTE_PBMT)) {
+            return TRANSLATE_FAIL;
+        } else if (pte & PTE_RSVD) {
+            return TRANSLATE_FAIL;
         } else if (!(pte & PTE_V)) {
             /* Invalid PTE */
             return TRANSLATE_FAIL;
         } else if (!(pte & (PTE_R | PTE_W | PTE_X))) {
             /* Inner PTE, continue walking */
+            if (pte & (PTE_D | PTE_A | PTE_U | PTE_N | PTE_PBMT)) {
+                return TRANSLATE_FAIL;
+            }
             base = ppn << PGSHIFT;
         } else if ((pte & (PTE_R | PTE_W | PTE_X)) == PTE_W) {
             /* Reserved leaf PTE flags: PTE_W */
-- 
2.17.1
Re: [PATCH v2 3/3] target/riscv: add support for svpbmt extension
Posted by Anup Patel 4 years, 1 month ago 
On Fri, Dec 31, 2021 at 1:40 PM Weiwei Li <liweiwei@iscas.ac.cn> wrote:
>
> It uses two PTE bits, but otherwise has no effect on QEMU, since QEMU is sequentially consistent and doesn't model PMAs currently
>
> Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
> Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
> Tested-by: Heiko Stuebner <heiko@sntech.de>
> ---
>  target/riscv/cpu.c        | 1 +
>  target/riscv/cpu.h        | 1 +
>  target/riscv/cpu_bits.h   | 3 +++
>  target/riscv/cpu_helper.c | 9 ++++++++-
>  4 files changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> index 77ef0f85fe..743bcfe297 100644
> --- a/target/riscv/cpu.c
> +++ b/target/riscv/cpu.c
> @@ -649,6 +649,7 @@ static Property riscv_cpu_properties[] = {
>      DEFINE_PROP_BOOL("x-j", RISCVCPU, cfg.ext_j, false),
>      DEFINE_PROP_BOOL("x-svinval", RISCVCPU, cfg.ext_svinval, false),
>      DEFINE_PROP_BOOL("x-svnapot", RISCVCPU, cfg.ext_svnapot, false),
> +    DEFINE_PROP_BOOL("x-svpbmt", RISCVCPU, cfg.ext_svpbmt, false),

Drop the "x-" prefix, same as the other two patches. The Svpmbt extension
is also ratified.

Regards,
Anup

>      /* ePMP 0.9.3 */
>      DEFINE_PROP_BOOL("x-epmp", RISCVCPU, cfg.epmp, false),
>
> diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
> index 5dd9e53293..6656b8a4f3 100644
> --- a/target/riscv/cpu.h
> +++ b/target/riscv/cpu.h
> @@ -317,6 +317,7 @@ struct RISCVCPU {
>          bool ext_icsr;
>          bool ext_svinval;
>          bool ext_svnapot;
> +        bool ext_svpbmt;
>          bool ext_zfh;
>          bool ext_zfhmin;
>
> diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
> index 1156c941cb..3dae358aa5 100644
> --- a/target/riscv/cpu_bits.h
> +++ b/target/riscv/cpu_bits.h
> @@ -483,7 +483,10 @@ typedef enum {
>  #define PTE_A               0x040 /* Accessed */
>  #define PTE_D               0x080 /* Dirty */
>  #define PTE_SOFT            0x300 /* Reserved for Software */
> +#define PTE_RSVD            0x1FC0000000000000 /* Reserved for future use */
> +#define PTE_PBMT            0x6000000000000000 /* Page-based memory types */
>  #define PTE_N               0x8000000000000000 /* NAPOT translation */
> +#define PTE_ATTR            0xFFC0000000000000 /* All attributes bits */
>
>  /* Page table PPN shift amount */
>  #define PTE_PPN_SHIFT       10
> diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
> index e044153986..41d04675b3 100644
> --- a/target/riscv/cpu_helper.c
> +++ b/target/riscv/cpu_helper.c
> @@ -619,16 +619,23 @@ restart:
>              return TRANSLATE_FAIL;
>          }
>
> -        hwaddr ppn = (pte & ~(target_ulong)PTE_N) >> PTE_PPN_SHIFT;
> +        hwaddr ppn = (pte & ~(target_ulong)PTE_ATTR) >> PTE_PPN_SHIFT;
>
>          RISCVCPU *cpu = env_archcpu(env);
>          if (!cpu->cfg.ext_svnapot && (pte & PTE_N)) {
>              return TRANSLATE_FAIL;
> +        } else if (!cpu->cfg.ext_svpbmt && (pte & PTE_PBMT)) {
> +            return TRANSLATE_FAIL;
> +        } else if (pte & PTE_RSVD) {
> +            return TRANSLATE_FAIL;
>          } else if (!(pte & PTE_V)) {
>              /* Invalid PTE */
>              return TRANSLATE_FAIL;
>          } else if (!(pte & (PTE_R | PTE_W | PTE_X))) {
>              /* Inner PTE, continue walking */
> +            if (pte & (PTE_D | PTE_A | PTE_U | PTE_N | PTE_PBMT)) {
> +                return TRANSLATE_FAIL;
> +            }
>              base = ppn << PGSHIFT;
>          } else if ((pte & (PTE_R | PTE_W | PTE_X)) == PTE_W) {
>              /* Reserved leaf PTE flags: PTE_W */
> --
> 2.17.1
>
>

Patchew 2.1-devel-b67e4c2

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