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[PATCH v5 3/5] target/riscv: add support for svnapot extension

Weiwei Li posted 5 patches 4 years ago
Maintainers: Alistair Francis <alistair.francis@wdc.com>, Palmer Dabbelt <palmer@dabbelt.com>, Bin Meng <bin.meng@windriver.com>
There is a newer version of this series
[PATCH v5 3/5] target/riscv: add support for svnapot extension
Posted by Weiwei Li 4 years ago 
- add PTE_N bit
- add PTE_N bit check for inner PTE
- update address translation to support 64KiB continuous region (napot_bits = 4)

Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
Cc: Anup Patel <anup@brainfault.org>
---
 target/riscv/cpu.c        |  2 ++
 target/riscv/cpu.h        |  1 +
 target/riscv/cpu_bits.h   |  1 +
 target/riscv/cpu_helper.c | 18 +++++++++++++++---
 4 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 9bc25d3055..ff6c86c85b 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -668,6 +668,8 @@ static Property riscv_cpu_properties[] = {
     DEFINE_PROP_UINT16("vlen", RISCVCPU, cfg.vlen, 128),
     DEFINE_PROP_UINT16("elen", RISCVCPU, cfg.elen, 64),
 
+    DEFINE_PROP_BOOL("svnapot", RISCVCPU, cfg.ext_svnapot, false),
+
     DEFINE_PROP_BOOL("zba", RISCVCPU, cfg.ext_zba, true),
     DEFINE_PROP_BOOL("zbb", RISCVCPU, cfg.ext_zbb, true),
     DEFINE_PROP_BOOL("zbc", RISCVCPU, cfg.ext_zbc, true),
diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index 4d63086765..d3d17cde82 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -327,6 +327,7 @@ struct RISCVCPU {
         bool ext_counters;
         bool ext_ifencei;
         bool ext_icsr;
+        bool ext_svnapot;
         bool ext_zfh;
         bool ext_zfhmin;
 
diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
index 282cd8eecd..5501e9698b 100644
--- a/target/riscv/cpu_bits.h
+++ b/target/riscv/cpu_bits.h
@@ -486,6 +486,7 @@ typedef enum {
 #define PTE_A               0x040 /* Accessed */
 #define PTE_D               0x080 /* Dirty */
 #define PTE_SOFT            0x300 /* Reserved for Software */
+#define PTE_N               0x8000000000000000 /* NAPOT translation */
 
 /* 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 1820188f41..c276760c7f 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -621,12 +621,13 @@ restart:
 
         hwaddr ppn = (pte & PTE_PPN_MASK) >> PTE_PPN_SHIFT;
 
+        RISCVCPU *cpu = env_archcpu(env);
         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)) {
+            if (pte & (target_ulong)(PTE_D | PTE_A | PTE_U | PTE_N)) {
                 return TRANSLATE_FAIL;
             }
             base = ppn << PGSHIFT;
@@ -702,8 +703,19 @@ restart:
             /* for superpage mappings, make a fake leaf PTE for the TLB's
                benefit. */
             target_ulong vpn = addr >> PGSHIFT;
-            *physical = ((ppn | (vpn & ((1L << ptshift) - 1))) << PGSHIFT) |
-                        (addr & ~TARGET_PAGE_MASK);
+
+            int napot_bits = 0;
+            if (cpu->cfg.ext_svnapot && (pte & (target_ulong)PTE_N)) {
+                napot_bits = ctzl(ppn) + 1;
+                if ((i != (levels - 1)) || (napot_bits != 4)) {
+                    return TRANSLATE_FAIL;
+                }
+            }
+
+            *physical = (((ppn & ~(((target_ulong)1 << napot_bits) - 1)) |
+                          (vpn & (((target_ulong)1 << napot_bits) - 1)) |
+                          (vpn & (((target_ulong)1 << ptshift) - 1))
+                        ) << PGSHIFT) | (addr & ~TARGET_PAGE_MASK);
 
             /* set permissions on the TLB entry */
             if ((pte & PTE_R) || ((pte & PTE_X) && mxr)) {
-- 
2.17.1
Re: [PATCH v5 3/5] target/riscv: add support for svnapot extension
Posted by Anup Patel 4 years ago 
On Tue, Jan 18, 2022 at 6:47 AM Weiwei Li <liweiwei@iscas.ac.cn> wrote:
>
> - add PTE_N bit
> - add PTE_N bit check for inner PTE
> - update address translation to support 64KiB continuous region (napot_bits = 4)
>
> Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
> Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
> Cc: Anup Patel <anup@brainfault.org>

I did review this patch previously.

In any case, this looks good to me.

Reviewed-by: Anup Patel <anup@brainfault.org>

Regards,
Anup

> ---
>  target/riscv/cpu.c        |  2 ++
>  target/riscv/cpu.h        |  1 +
>  target/riscv/cpu_bits.h   |  1 +
>  target/riscv/cpu_helper.c | 18 +++++++++++++++---
>  4 files changed, 19 insertions(+), 3 deletions(-)
>
> diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> index 9bc25d3055..ff6c86c85b 100644
> --- a/target/riscv/cpu.c
> +++ b/target/riscv/cpu.c
> @@ -668,6 +668,8 @@ static Property riscv_cpu_properties[] = {
>      DEFINE_PROP_UINT16("vlen", RISCVCPU, cfg.vlen, 128),
>      DEFINE_PROP_UINT16("elen", RISCVCPU, cfg.elen, 64),
>
> +    DEFINE_PROP_BOOL("svnapot", RISCVCPU, cfg.ext_svnapot, false),
> +
>      DEFINE_PROP_BOOL("zba", RISCVCPU, cfg.ext_zba, true),
>      DEFINE_PROP_BOOL("zbb", RISCVCPU, cfg.ext_zbb, true),
>      DEFINE_PROP_BOOL("zbc", RISCVCPU, cfg.ext_zbc, true),
> diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
> index 4d63086765..d3d17cde82 100644
> --- a/target/riscv/cpu.h
> +++ b/target/riscv/cpu.h
> @@ -327,6 +327,7 @@ struct RISCVCPU {
>          bool ext_counters;
>          bool ext_ifencei;
>          bool ext_icsr;
> +        bool ext_svnapot;
>          bool ext_zfh;
>          bool ext_zfhmin;
>
> diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
> index 282cd8eecd..5501e9698b 100644
> --- a/target/riscv/cpu_bits.h
> +++ b/target/riscv/cpu_bits.h
> @@ -486,6 +486,7 @@ typedef enum {
>  #define PTE_A               0x040 /* Accessed */
>  #define PTE_D               0x080 /* Dirty */
>  #define PTE_SOFT            0x300 /* Reserved for Software */
> +#define PTE_N               0x8000000000000000 /* NAPOT translation */
>
>  /* 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 1820188f41..c276760c7f 100644
> --- a/target/riscv/cpu_helper.c
> +++ b/target/riscv/cpu_helper.c
> @@ -621,12 +621,13 @@ restart:
>
>          hwaddr ppn = (pte & PTE_PPN_MASK) >> PTE_PPN_SHIFT;
>
> +        RISCVCPU *cpu = env_archcpu(env);
>          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)) {
> +            if (pte & (target_ulong)(PTE_D | PTE_A | PTE_U | PTE_N)) {
>                  return TRANSLATE_FAIL;
>              }
>              base = ppn << PGSHIFT;
> @@ -702,8 +703,19 @@ restart:
>              /* for superpage mappings, make a fake leaf PTE for the TLB's
>                 benefit. */
>              target_ulong vpn = addr >> PGSHIFT;
> -            *physical = ((ppn | (vpn & ((1L << ptshift) - 1))) << PGSHIFT) |
> -                        (addr & ~TARGET_PAGE_MASK);
> +
> +            int napot_bits = 0;
> +            if (cpu->cfg.ext_svnapot && (pte & (target_ulong)PTE_N)) {
> +                napot_bits = ctzl(ppn) + 1;
> +                if ((i != (levels - 1)) || (napot_bits != 4)) {
> +                    return TRANSLATE_FAIL;
> +                }
> +            }
> +
> +            *physical = (((ppn & ~(((target_ulong)1 << napot_bits) - 1)) |
> +                          (vpn & (((target_ulong)1 << napot_bits) - 1)) |
> +                          (vpn & (((target_ulong)1 << ptshift) - 1))
> +                        ) << PGSHIFT) | (addr & ~TARGET_PAGE_MASK);
>
>              /* set permissions on the TLB entry */
>              if ((pte & PTE_R) || ((pte & PTE_X) && mxr)) {
> --
> 2.17.1
>
Re: [PATCH v5 3/5] target/riscv: add support for svnapot extension
Posted by Weiwei Li 4 years ago 
在 2022/1/18 上午11:32, Anup Patel 写道:
> On Tue, Jan 18, 2022 at 6:47 AM Weiwei Li <liweiwei@iscas.ac.cn> wrote:
>> - add PTE_N bit
>> - add PTE_N bit check for inner PTE
>> - update address translation to support 64KiB continuous region (napot_bits = 4)
>>
>> Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
>> Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
>> Cc: Anup Patel <anup@brainfault.org>
> I did review this patch previously.
>
> In any case, this looks good to me.
>
> Reviewed-by: Anup Patel <anup@brainfault.org>
>
> Regards,
> Anup

Thanks a lot. Sorry for your repeated work.

Regards.

Weiwei Li

>> ---
>>   target/riscv/cpu.c        |  2 ++
>>   target/riscv/cpu.h        |  1 +
>>   target/riscv/cpu_bits.h   |  1 +
>>   target/riscv/cpu_helper.c | 18 +++++++++++++++---
>>   4 files changed, 19 insertions(+), 3 deletions(-)
>>
>> diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
>> index 9bc25d3055..ff6c86c85b 100644
>> --- a/target/riscv/cpu.c
>> +++ b/target/riscv/cpu.c
>> @@ -668,6 +668,8 @@ static Property riscv_cpu_properties[] = {
>>       DEFINE_PROP_UINT16("vlen", RISCVCPU, cfg.vlen, 128),
>>       DEFINE_PROP_UINT16("elen", RISCVCPU, cfg.elen, 64),
>>
>> +    DEFINE_PROP_BOOL("svnapot", RISCVCPU, cfg.ext_svnapot, false),
>> +
>>       DEFINE_PROP_BOOL("zba", RISCVCPU, cfg.ext_zba, true),
>>       DEFINE_PROP_BOOL("zbb", RISCVCPU, cfg.ext_zbb, true),
>>       DEFINE_PROP_BOOL("zbc", RISCVCPU, cfg.ext_zbc, true),
>> diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
>> index 4d63086765..d3d17cde82 100644
>> --- a/target/riscv/cpu.h
>> +++ b/target/riscv/cpu.h
>> @@ -327,6 +327,7 @@ struct RISCVCPU {
>>           bool ext_counters;
>>           bool ext_ifencei;
>>           bool ext_icsr;
>> +        bool ext_svnapot;
>>           bool ext_zfh;
>>           bool ext_zfhmin;
>>
>> diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
>> index 282cd8eecd..5501e9698b 100644
>> --- a/target/riscv/cpu_bits.h
>> +++ b/target/riscv/cpu_bits.h
>> @@ -486,6 +486,7 @@ typedef enum {
>>   #define PTE_A               0x040 /* Accessed */
>>   #define PTE_D               0x080 /* Dirty */
>>   #define PTE_SOFT            0x300 /* Reserved for Software */
>> +#define PTE_N               0x8000000000000000 /* NAPOT translation */
>>
>>   /* 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 1820188f41..c276760c7f 100644
>> --- a/target/riscv/cpu_helper.c
>> +++ b/target/riscv/cpu_helper.c
>> @@ -621,12 +621,13 @@ restart:
>>
>>           hwaddr ppn = (pte & PTE_PPN_MASK) >> PTE_PPN_SHIFT;
>>
>> +        RISCVCPU *cpu = env_archcpu(env);
>>           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)) {
>> +            if (pte & (target_ulong)(PTE_D | PTE_A | PTE_U | PTE_N)) {
>>                   return TRANSLATE_FAIL;
>>               }
>>               base = ppn << PGSHIFT;
>> @@ -702,8 +703,19 @@ restart:
>>               /* for superpage mappings, make a fake leaf PTE for the TLB's
>>                  benefit. */
>>               target_ulong vpn = addr >> PGSHIFT;
>> -            *physical = ((ppn | (vpn & ((1L << ptshift) - 1))) << PGSHIFT) |
>> -                        (addr & ~TARGET_PAGE_MASK);
>> +
>> +            int napot_bits = 0;
>> +            if (cpu->cfg.ext_svnapot && (pte & (target_ulong)PTE_N)) {
>> +                napot_bits = ctzl(ppn) + 1;
>> +                if ((i != (levels - 1)) || (napot_bits != 4)) {
>> +                    return TRANSLATE_FAIL;
>> +                }
>> +            }
>> +
>> +            *physical = (((ppn & ~(((target_ulong)1 << napot_bits) - 1)) |
>> +                          (vpn & (((target_ulong)1 << napot_bits) - 1)) |
>> +                          (vpn & (((target_ulong)1 << ptshift) - 1))
>> +                        ) << PGSHIFT) | (addr & ~TARGET_PAGE_MASK);
>>
>>               /* set permissions on the TLB entry */
>>               if ((pte & PTE_R) || ((pte & PTE_X) && mxr)) {
>> --
>> 2.17.1
>>

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