[PATCH qemu v3] linux-user: Emulate /proc/cpuinfo output for riscv

Afonso Bordado posted 1 patch 1 year ago
Failed in applying to current master (apply log)
linux-user/syscall.c              | 34 +++++++++++++++++++++++++++++--
tests/tcg/riscv64/Makefile.target |  1 +
tests/tcg/riscv64/cpuinfo.c       | 30 +++++++++++++++++++++++++++
3 files changed, 63 insertions(+), 2 deletions(-)
create mode 100644 tests/tcg/riscv64/cpuinfo.c
[PATCH qemu v3] linux-user: Emulate /proc/cpuinfo output for riscv
Posted by Afonso Bordado 1 year ago
RISC-V does not expose all extensions via hwcaps, thus some userspace
applications may want to query these via /proc/cpuinfo.

Currently when querying this file the host's file is shown instead
which is slightly confusing. Emulate a basic /proc/cpuinfo file
with mmu info and an ISA string.

Signed-off-by: Afonso Bordado <afonsobordado@gmail.com>
Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
---

Thanks everyone for reviewing! Should I resend this once the 8.0
freeze is over? Or does someone queue it for inclusion in the next
version?


Changes from V2:
- Update ChangeLog Location

Changes from V1:
- Call `g_free` on ISA string.
- Use `riscv_cpu_cfg` API.
- Query `cpu_env->xl` to check for RV32.


  linux-user/syscall.c              | 34 +++++++++++++++++++++++++++++--
  tests/tcg/riscv64/Makefile.target |  1 +
  tests/tcg/riscv64/cpuinfo.c       | 30 +++++++++++++++++++++++++++
  3 files changed, 63 insertions(+), 2 deletions(-)
  create mode 100644 tests/tcg/riscv64/cpuinfo.c

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 24cea6fb6a..0388f8b0b0 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -8230,7 +8230,8 @@ void target_exception_dump(CPUArchState *env, const char *fmt, int code)
  }
  
  #if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN || \
-    defined(TARGET_SPARC) || defined(TARGET_M68K) || defined(TARGET_HPPA)
+    defined(TARGET_SPARC) || defined(TARGET_M68K) || defined(TARGET_HPPA) || \
+    defined(TARGET_RISCV)
  static int is_proc(const char *filename, const char *entry)
  {
      return strcmp(filename, entry) == 0;
@@ -8308,6 +8309,35 @@ static int open_cpuinfo(CPUArchState *cpu_env, int fd)
  }
  #endif
  
+#if defined(TARGET_RISCV)
+static int open_cpuinfo(CPUArchState *cpu_env, int fd)
+{
+    int i;
+    int num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+    RISCVCPU *cpu = env_archcpu(cpu_env);
+    const RISCVCPUConfig *cfg = riscv_cpu_cfg((CPURISCVState *) cpu_env);
+    char *isa_string = riscv_isa_string(cpu);
+    const char *mmu;
+
+    if (cfg->mmu) {
+        mmu = (cpu_env->xl == MXL_RV32) ? "sv32"  : "sv48";
+    } else {
+        mmu = "none";
+    }
+
+    for (i = 0; i < num_cpus; i++) {
+        dprintf(fd, "processor\t: %d\n", i);
+        dprintf(fd, "hart\t\t: %d\n", i);
+        dprintf(fd, "isa\t\t: %s\n", isa_string);
+        dprintf(fd, "mmu\t\t: %s\n", mmu);
+        dprintf(fd, "uarch\t\t: qemu\n\n");
+    }
+
+    g_free(isa_string);
+    return 0;
+}
+#endif
+
  #if defined(TARGET_M68K)
  static int open_hardware(CPUArchState *cpu_env, int fd)
  {
@@ -8332,7 +8362,7 @@ static int do_openat(CPUArchState *cpu_env, int dirfd, const char *pathname, int
  #if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN
          { "/proc/net/route", open_net_route, is_proc },
  #endif
-#if defined(TARGET_SPARC) || defined(TARGET_HPPA)
+#if defined(TARGET_SPARC) || defined(TARGET_HPPA) || defined(TARGET_RISCV)
          { "/proc/cpuinfo", open_cpuinfo, is_proc },
  #endif
  #if defined(TARGET_M68K)
diff --git a/tests/tcg/riscv64/Makefile.target
b/tests/tcg/riscv64/Makefile.target
index cc3ed65ffd..df93a2ce1f 100644
--- a/tests/tcg/riscv64/Makefile.target
+++ b/tests/tcg/riscv64/Makefile.target
@@ -4,6 +4,7 @@
  VPATH += $(SRC_PATH)/tests/tcg/riscv64
  TESTS += test-div
  TESTS += noexec
+TESTS += cpuinfo
  
  # Disable compressed instructions for test-noc
  TESTS += test-noc
diff --git a/tests/tcg/riscv64/cpuinfo.c b/tests/tcg/riscv64/cpuinfo.c
new file mode 100644
index 0000000000..296abd0a8c
--- /dev/null
+++ b/tests/tcg/riscv64/cpuinfo.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#define BUFFER_SIZE 1024
+
+int main(void)
+{
+    char buffer[BUFFER_SIZE];
+    FILE *fp = fopen("/proc/cpuinfo", "r");
+    assert(fp != NULL);
+
+    while (fgets(buffer, BUFFER_SIZE, fp) != NULL) {
+        if (strstr(buffer, "processor") != NULL) {
+            assert(strstr(buffer, "processor\t: ") == buffer);
+        } else if (strstr(buffer, "hart") != NULL) {
+            assert(strstr(buffer, "hart\t\t: ") == buffer);
+        } else if (strstr(buffer, "isa") != NULL) {
+            assert(strcmp(buffer, "isa\t\t: rv64imafdc_zicsr_zifencei\n") == 0);
+        } else if (strstr(buffer, "mmu") != NULL) {
+            assert(strcmp(buffer, "mmu\t\t: sv48\n") == 0);
+        } else if (strstr(buffer, "uarch") != NULL) {
+            assert(strcmp(buffer, "uarch\t\t: qemu\n") == 0);
+        }
+    }
+
+    fclose(fp);
+    return 0;
+}
-- 
2.34.7
Re: [PATCH qemu v3] linux-user: Emulate /proc/cpuinfo output for riscv
Posted by Laurent Vivier 1 year ago
Le 21/03/2023 à 19:25, Afonso Bordado a écrit :
> RISC-V does not expose all extensions via hwcaps, thus some userspace
> applications may want to query these via /proc/cpuinfo.
> 
> Currently when querying this file the host's file is shown instead
> which is slightly confusing. Emulate a basic /proc/cpuinfo file
> with mmu info and an ISA string.
> 
> Signed-off-by: Afonso Bordado <afonsobordado@gmail.com>
> Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com>
> Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
> Reviewed-by: Laurent Vivier <laurent@vivier.eu>
> Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
> Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
> ---
> 
> Thanks everyone for reviewing! Should I resend this once the 8.0
> freeze is over? Or does someone queue it for inclusion in the next
> version?

I queue this for 8.1 in the linux-use branch.

Thanks,
Laurent
> 
> 
> Changes from V2:
> - Update ChangeLog Location
> 
> Changes from V1:
> - Call `g_free` on ISA string.
> - Use `riscv_cpu_cfg` API.
> - Query `cpu_env->xl` to check for RV32.
> 
> 
>   linux-user/syscall.c              | 34 +++++++++++++++++++++++++++++--
>   tests/tcg/riscv64/Makefile.target |  1 +
>   tests/tcg/riscv64/cpuinfo.c       | 30 +++++++++++++++++++++++++++
>   3 files changed, 63 insertions(+), 2 deletions(-)
>   create mode 100644 tests/tcg/riscv64/cpuinfo.c
> 
> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
> index 24cea6fb6a..0388f8b0b0 100644
> --- a/linux-user/syscall.c
> +++ b/linux-user/syscall.c
> @@ -8230,7 +8230,8 @@ void target_exception_dump(CPUArchState *env, const char *fmt, int code)
>   }
> 
>   #if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN || \
> -    defined(TARGET_SPARC) || defined(TARGET_M68K) || defined(TARGET_HPPA)
> +    defined(TARGET_SPARC) || defined(TARGET_M68K) || defined(TARGET_HPPA) || \
> +    defined(TARGET_RISCV)
>   static int is_proc(const char *filename, const char *entry)
>   {
>       return strcmp(filename, entry) == 0;
> @@ -8308,6 +8309,35 @@ static int open_cpuinfo(CPUArchState *cpu_env, int fd)
>   }
>   #endif
> 
> +#if defined(TARGET_RISCV)
> +static int open_cpuinfo(CPUArchState *cpu_env, int fd)
> +{
> +    int i;
> +    int num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
> +    RISCVCPU *cpu = env_archcpu(cpu_env);
> +    const RISCVCPUConfig *cfg = riscv_cpu_cfg((CPURISCVState *) cpu_env);
> +    char *isa_string = riscv_isa_string(cpu);
> +    const char *mmu;
> +
> +    if (cfg->mmu) {
> +        mmu = (cpu_env->xl == MXL_RV32) ? "sv32"  : "sv48";
> +    } else {
> +        mmu = "none";
> +    }
> +
> +    for (i = 0; i < num_cpus; i++) {
> +        dprintf(fd, "processor\t: %d\n", i);
> +        dprintf(fd, "hart\t\t: %d\n", i);
> +        dprintf(fd, "isa\t\t: %s\n", isa_string);
> +        dprintf(fd, "mmu\t\t: %s\n", mmu);
> +        dprintf(fd, "uarch\t\t: qemu\n\n");
> +    }
> +
> +    g_free(isa_string);
> +    return 0;
> +}
> +#endif
> +
>   #if defined(TARGET_M68K)
>   static int open_hardware(CPUArchState *cpu_env, int fd)
>   {
> @@ -8332,7 +8362,7 @@ static int do_openat(CPUArchState *cpu_env, int dirfd, const char *pathname, int
>   #if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN
>           { "/proc/net/route", open_net_route, is_proc },
>   #endif
> -#if defined(TARGET_SPARC) || defined(TARGET_HPPA)
> +#if defined(TARGET_SPARC) || defined(TARGET_HPPA) || defined(TARGET_RISCV)
>           { "/proc/cpuinfo", open_cpuinfo, is_proc },
>   #endif
>   #if defined(TARGET_M68K)
> diff --git a/tests/tcg/riscv64/Makefile.target
> b/tests/tcg/riscv64/Makefile.target
> index cc3ed65ffd..df93a2ce1f 100644
> --- a/tests/tcg/riscv64/Makefile.target
> +++ b/tests/tcg/riscv64/Makefile.target
> @@ -4,6 +4,7 @@
>   VPATH += $(SRC_PATH)/tests/tcg/riscv64
>   TESTS += test-div
>   TESTS += noexec
> +TESTS += cpuinfo
> 
>   # Disable compressed instructions for test-noc
>   TESTS += test-noc
> diff --git a/tests/tcg/riscv64/cpuinfo.c b/tests/tcg/riscv64/cpuinfo.c
> new file mode 100644
> index 0000000000..296abd0a8c
> --- /dev/null
> +++ b/tests/tcg/riscv64/cpuinfo.c
> @@ -0,0 +1,30 @@
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <assert.h>
> +
> +#define BUFFER_SIZE 1024
> +
> +int main(void)
> +{
> +    char buffer[BUFFER_SIZE];
> +    FILE *fp = fopen("/proc/cpuinfo", "r");
> +    assert(fp != NULL);
> +
> +    while (fgets(buffer, BUFFER_SIZE, fp) != NULL) {
> +        if (strstr(buffer, "processor") != NULL) {
> +            assert(strstr(buffer, "processor\t: ") == buffer);
> +        } else if (strstr(buffer, "hart") != NULL) {
> +            assert(strstr(buffer, "hart\t\t: ") == buffer);
> +        } else if (strstr(buffer, "isa") != NULL) {
> +            assert(strcmp(buffer, "isa\t\t: rv64imafdc_zicsr_zifencei\n") == 0);
> +        } else if (strstr(buffer, "mmu") != NULL) {
> +            assert(strcmp(buffer, "mmu\t\t: sv48\n") == 0);
> +        } else if (strstr(buffer, "uarch") != NULL) {
> +            assert(strcmp(buffer, "uarch\t\t: qemu\n") == 0);
> +        }
> +    }
> +
> +    fclose(fp);
> +    return 0;
> +}


Re: [PATCH qemu v3] linux-user: Emulate /proc/cpuinfo output for riscv
Posted by Laurent Vivier 1 year ago
Le 23/03/2023 à 08:52, Laurent Vivier a écrit :
> Le 21/03/2023 à 19:25, Afonso Bordado a écrit :
>> RISC-V does not expose all extensions via hwcaps, thus some userspace
>> applications may want to query these via /proc/cpuinfo.
>>
>> Currently when querying this file the host's file is shown instead
>> which is slightly confusing. Emulate a basic /proc/cpuinfo file
>> with mmu info and an ISA string.
>>
>> Signed-off-by: Afonso Bordado <afonsobordado@gmail.com>
>> Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com>
>> Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
>> Reviewed-by: Laurent Vivier <laurent@vivier.eu>
>> Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
>> Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
>> ---
>>
>> Thanks everyone for reviewing! Should I resend this once the 8.0
>> freeze is over? Or does someone queue it for inclusion in the next
>> version?
> 
> I queue this for 8.1 in the linux-use branch.

I've applied v2 as v3 seems to be corrupted. I've removed the changelog from the commit message.

Thanks,
Laurent

> Thanks,
> Laurent
>>
>>
>> Changes from V2:
>> - Update ChangeLog Location
>>
>> Changes from V1:
>> - Call `g_free` on ISA string.
>> - Use `riscv_cpu_cfg` API.
>> - Query `cpu_env->xl` to check for RV32.
>>
>>
>>   linux-user/syscall.c              | 34 +++++++++++++++++++++++++++++--
>>   tests/tcg/riscv64/Makefile.target |  1 +
>>   tests/tcg/riscv64/cpuinfo.c       | 30 +++++++++++++++++++++++++++
>>   3 files changed, 63 insertions(+), 2 deletions(-)
>>   create mode 100644 tests/tcg/riscv64/cpuinfo.c
>>
>> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
>> index 24cea6fb6a..0388f8b0b0 100644
>> --- a/linux-user/syscall.c
>> +++ b/linux-user/syscall.c
>> @@ -8230,7 +8230,8 @@ void target_exception_dump(CPUArchState *env, const char *fmt, int code)
>>   }
>>
>>   #if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN || \
>> -    defined(TARGET_SPARC) || defined(TARGET_M68K) || defined(TARGET_HPPA)
>> +    defined(TARGET_SPARC) || defined(TARGET_M68K) || defined(TARGET_HPPA) || \
>> +    defined(TARGET_RISCV)
>>   static int is_proc(const char *filename, const char *entry)
>>   {
>>       return strcmp(filename, entry) == 0;
>> @@ -8308,6 +8309,35 @@ static int open_cpuinfo(CPUArchState *cpu_env, int fd)
>>   }
>>   #endif
>>
>> +#if defined(TARGET_RISCV)
>> +static int open_cpuinfo(CPUArchState *cpu_env, int fd)
>> +{
>> +    int i;
>> +    int num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
>> +    RISCVCPU *cpu = env_archcpu(cpu_env);
>> +    const RISCVCPUConfig *cfg = riscv_cpu_cfg((CPURISCVState *) cpu_env);
>> +    char *isa_string = riscv_isa_string(cpu);
>> +    const char *mmu;
>> +
>> +    if (cfg->mmu) {
>> +        mmu = (cpu_env->xl == MXL_RV32) ? "sv32"  : "sv48";
>> +    } else {
>> +        mmu = "none";
>> +    }
>> +
>> +    for (i = 0; i < num_cpus; i++) {
>> +        dprintf(fd, "processor\t: %d\n", i);
>> +        dprintf(fd, "hart\t\t: %d\n", i);
>> +        dprintf(fd, "isa\t\t: %s\n", isa_string);
>> +        dprintf(fd, "mmu\t\t: %s\n", mmu);
>> +        dprintf(fd, "uarch\t\t: qemu\n\n");
>> +    }
>> +
>> +    g_free(isa_string);
>> +    return 0;
>> +}
>> +#endif
>> +
>>   #if defined(TARGET_M68K)
>>   static int open_hardware(CPUArchState *cpu_env, int fd)
>>   {
>> @@ -8332,7 +8362,7 @@ static int do_openat(CPUArchState *cpu_env, int dirfd, const char *pathname, 
>> int
>>   #if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN
>>           { "/proc/net/route", open_net_route, is_proc },
>>   #endif
>> -#if defined(TARGET_SPARC) || defined(TARGET_HPPA)
>> +#if defined(TARGET_SPARC) || defined(TARGET_HPPA) || defined(TARGET_RISCV)
>>           { "/proc/cpuinfo", open_cpuinfo, is_proc },
>>   #endif
>>   #if defined(TARGET_M68K)
>> diff --git a/tests/tcg/riscv64/Makefile.target
>> b/tests/tcg/riscv64/Makefile.target
>> index cc3ed65ffd..df93a2ce1f 100644
>> --- a/tests/tcg/riscv64/Makefile.target
>> +++ b/tests/tcg/riscv64/Makefile.target
>> @@ -4,6 +4,7 @@
>>   VPATH += $(SRC_PATH)/tests/tcg/riscv64
>>   TESTS += test-div
>>   TESTS += noexec
>> +TESTS += cpuinfo
>>
>>   # Disable compressed instructions for test-noc
>>   TESTS += test-noc
>> diff --git a/tests/tcg/riscv64/cpuinfo.c b/tests/tcg/riscv64/cpuinfo.c
>> new file mode 100644
>> index 0000000000..296abd0a8c
>> --- /dev/null
>> +++ b/tests/tcg/riscv64/cpuinfo.c
>> @@ -0,0 +1,30 @@
>> +#include <stdio.h>
>> +#include <stdlib.h>
>> +#include <string.h>
>> +#include <assert.h>
>> +
>> +#define BUFFER_SIZE 1024
>> +
>> +int main(void)
>> +{
>> +    char buffer[BUFFER_SIZE];
>> +    FILE *fp = fopen("/proc/cpuinfo", "r");
>> +    assert(fp != NULL);
>> +
>> +    while (fgets(buffer, BUFFER_SIZE, fp) != NULL) {
>> +        if (strstr(buffer, "processor") != NULL) {
>> +            assert(strstr(buffer, "processor\t: ") == buffer);
>> +        } else if (strstr(buffer, "hart") != NULL) {
>> +            assert(strstr(buffer, "hart\t\t: ") == buffer);
>> +        } else if (strstr(buffer, "isa") != NULL) {
>> +            assert(strcmp(buffer, "isa\t\t: rv64imafdc_zicsr_zifencei\n") == 0);
>> +        } else if (strstr(buffer, "mmu") != NULL) {
>> +            assert(strcmp(buffer, "mmu\t\t: sv48\n") == 0);
>> +        } else if (strstr(buffer, "uarch") != NULL) {
>> +            assert(strcmp(buffer, "uarch\t\t: qemu\n") == 0);
>> +        }
>> +    }
>> +
>> +    fclose(fp);
>> +    return 0;
>> +}
> 
>