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linux-user: Emulate /proc/cpuinfo on s390x

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Some s390x userspace programs are confused when seeing a foreign
/proc/cpuinfo [1]. Add the emulation for s390x; follow the respective
kernel code structure where possible.

Output example:

	vendor_id       : IBM/S390
	# processors    : 12
	bogomips per cpu: 13370.00
	max thread id   : 0
	features	: esan3 zarch stfle msa
	facilities      : 0 1 2 3 4 7 9 16 17 18 19 21 22 24 25 27 30 31 32 33 34 35 37 40 41 45 49 51 52 53 57 58 61 69 71 72 75 76 77 129 130 131 135 138 146 148
	processor 0: version = 00,  identification = 000000,  machine = 8561
	processor 1: version = 00,  identification = 100000,  machine = 8561
	[...]

	cpu number      : 0
	version         : 00
	identification  : 000000
	machine         : 8561

	cpu number      : 1
	version         : 00
	identification  : 100000
	machine         : 8561
	[...]

[1] https://bugzilla.redhat.com/show_bug.cgi?id=2211472

Reported-by: Tulio Magno Quites Machado Filho <tuliom@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20230605113950.1169228-5-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Ilya Leoshkevich 2023-06-05 13:39:50 +02:00 committed by Thomas Huth
parent e19807bee3
commit 1fb9bdaf59
1 changed files with 104 additions and 2 deletions
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106
linux-user/syscall.c
View File

@ -8232,7 +8232,7 @@ 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_RISCV)
defined(TARGET_RISCV) || defined(TARGET_S390X)
static int is_proc(const char *filename, const char *entry)
{
return strcmp(filename, entry) == 0;
@ -8339,6 +8339,107 @@ static int open_cpuinfo(CPUArchState *cpu_env, int fd)
}
#endif
#if defined(TARGET_S390X)
/*
* Emulate what a Linux kernel running in qemu-system-s390x -M accel=tcg would
* show in /proc/cpuinfo.
*
* Skip the following in order to match the missing support in op_ecag():
* - show_cacheinfo().
* - show_cpu_topology().
* - show_cpu_mhz().
*
* Use fixed values for certain fields:
* - bogomips per cpu - from a qemu-system-s390x run.
* - max thread id = 0, since SMT / SIGP_SET_MULTI_THREADING is not supported.
*
* Keep the code structure close to arch/s390/kernel/processor.c.
*/
static void show_facilities(int fd)
{
size_t sizeof_stfl_bytes = 2048;
g_autofree uint8_t *stfl_bytes = g_new0(uint8_t, sizeof_stfl_bytes);
unsigned int bit;
dprintf(fd, "facilities :");
s390_get_feat_block(S390_FEAT_TYPE_STFL, stfl_bytes);
for (bit = 0; bit < sizeof_stfl_bytes * 8; bit++) {
if (test_be_bit(bit, stfl_bytes)) {
dprintf(fd, " %d", bit);
}
}
dprintf(fd, "\n");
}
static int cpu_ident(unsigned long n)
{
return deposit32(0, CPU_ID_BITS - CPU_PHYS_ADDR_BITS, CPU_PHYS_ADDR_BITS,
n);
}
static void show_cpu_summary(CPUArchState *cpu_env, int fd)
{
S390CPUModel *model = env_archcpu(cpu_env)->model;
int num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
uint32_t elf_hwcap = get_elf_hwcap();
const char *hwcap_str;
int i;
dprintf(fd, "vendor_id : IBM/S390\n"
"# processors : %i\n"
"bogomips per cpu: 13370.00\n",
num_cpus);
dprintf(fd, "max thread id : 0\n");
dprintf(fd, "features\t: ");
for (i = 0; i < sizeof(elf_hwcap) * 8; i++) {
if (!(elf_hwcap & (1 << i))) {
continue;
}
hwcap_str = elf_hwcap_str(i);
if (hwcap_str) {
dprintf(fd, "%s ", hwcap_str);
}
}
dprintf(fd, "\n");
show_facilities(fd);
for (i = 0; i < num_cpus; i++) {
dprintf(fd, "processor %d: "
"version = %02X, "
"identification = %06X, "
"machine = %04X\n",
i, model->cpu_ver, cpu_ident(i), model->def->type);
}
}
static void show_cpu_ids(CPUArchState *cpu_env, int fd, unsigned long n)
{
S390CPUModel *model = env_archcpu(cpu_env)->model;
dprintf(fd, "version : %02X\n", model->cpu_ver);
dprintf(fd, "identification : %06X\n", cpu_ident(n));
dprintf(fd, "machine : %04X\n", model->def->type);
}
static void show_cpuinfo(CPUArchState *cpu_env, int fd, unsigned long n)
{
dprintf(fd, "\ncpu number : %ld\n", n);
show_cpu_ids(cpu_env, fd, n);
}
static int open_cpuinfo(CPUArchState *cpu_env, int fd)
{
int num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
int i;
show_cpu_summary(cpu_env, fd);
for (i = 0; i < num_cpus; i++) {
show_cpuinfo(cpu_env, fd, i);
}
return 0;
}
#endif
#if defined(TARGET_M68K)
static int open_hardware(CPUArchState *cpu_env, int fd)
{
@ -8363,7 +8464,8 @@ 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) || defined(TARGET_RISCV)
#if defined(TARGET_SPARC) || defined(TARGET_HPPA) || \
defined(TARGET_RISCV) || defined(TARGET_S390X)
{ "/proc/cpuinfo", open_cpuinfo, is_proc },
#endif
#if defined(TARGET_M68K)