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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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92e6ecf392
Currently we use the cpuid (via STIDP instruction) to recognize LPAR, z/VM and KVM. The architecture states, that bit 0-7 of STIDP returns all zero, and if STIDP is executed in a virtual machine, the VM operating system will replace bits 0-7 with FF. KVM should not use FE to distinguish z/VM from KVM for interested guests. The proper way to detect the hypervisor is the STSI (Store System Information) instruction, which return information about the hypervisors via function code 3, selector1=2, selector2=2. This patch changes the detection routine of Linux to use STSI instead of STIDP. This detection is earlier than bootmem, we have to use a static buffer. Since STSI expects a 4kb block (4kb aligned) this patch also changes the init.data alignment for s390. As this section will be freed during boot, this should be no problem. Patch is tested with LPAR, z/VM, KVM on LPAR, and KVM under z/VM. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
134 lines
2.9 KiB
C
134 lines
2.9 KiB
C
/*
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* definition for store system information stsi
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*
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* Copyright IBM Corp. 2001,2008
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (version 2 only)
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* as published by the Free Software Foundation.
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*
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* Author(s): Ulrich Weigand <weigand@de.ibm.com>
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* Christian Borntraeger <borntraeger@de.ibm.com>
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*/
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#ifndef __ASM_S390_SYSINFO_H
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#define __ASM_S390_SYSINFO_H
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struct sysinfo_1_1_1 {
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char reserved_0[32];
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char manufacturer[16];
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char type[4];
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char reserved_1[12];
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char model_capacity[16];
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char sequence[16];
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char plant[4];
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char model[16];
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char model_perm_cap[16];
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char model_temp_cap[16];
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char model_cap_rating[4];
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char model_perm_cap_rating[4];
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char model_temp_cap_rating[4];
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};
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struct sysinfo_1_2_1 {
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char reserved_0[80];
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char sequence[16];
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char plant[4];
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char reserved_1[2];
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unsigned short cpu_address;
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};
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struct sysinfo_1_2_2 {
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char format;
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char reserved_0[1];
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unsigned short acc_offset;
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char reserved_1[24];
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unsigned int secondary_capability;
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unsigned int capability;
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unsigned short cpus_total;
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unsigned short cpus_configured;
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unsigned short cpus_standby;
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unsigned short cpus_reserved;
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unsigned short adjustment[0];
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};
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struct sysinfo_1_2_2_extension {
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unsigned int alt_capability;
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unsigned short alt_adjustment[0];
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};
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struct sysinfo_2_2_1 {
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char reserved_0[80];
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char sequence[16];
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char plant[4];
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unsigned short cpu_id;
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unsigned short cpu_address;
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};
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struct sysinfo_2_2_2 {
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char reserved_0[32];
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unsigned short lpar_number;
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char reserved_1;
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unsigned char characteristics;
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unsigned short cpus_total;
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unsigned short cpus_configured;
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unsigned short cpus_standby;
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unsigned short cpus_reserved;
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char name[8];
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unsigned int caf;
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char reserved_2[16];
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unsigned short cpus_dedicated;
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unsigned short cpus_shared;
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};
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#define LPAR_CHAR_DEDICATED (1 << 7)
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#define LPAR_CHAR_SHARED (1 << 6)
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#define LPAR_CHAR_LIMITED (1 << 5)
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struct sysinfo_3_2_2 {
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char reserved_0[31];
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unsigned char count;
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struct {
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char reserved_0[4];
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unsigned short cpus_total;
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unsigned short cpus_configured;
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unsigned short cpus_standby;
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unsigned short cpus_reserved;
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char name[8];
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unsigned int caf;
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char cpi[16];
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char reserved_1[24];
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} vm[8];
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char reserved_544[3552];
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};
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static inline int stsi(void *sysinfo, int fc, int sel1, int sel2)
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{
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register int r0 asm("0") = (fc << 28) | sel1;
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register int r1 asm("1") = sel2;
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asm volatile(
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" stsi 0(%2)\n"
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"0: jz 2f\n"
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"1: lhi %0,%3\n"
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"2:\n"
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EX_TABLE(0b, 1b)
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: "+d" (r0) : "d" (r1), "a" (sysinfo), "K" (-ENOSYS)
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: "cc", "memory");
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return r0;
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}
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/*
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* Service level reporting interface.
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*/
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struct service_level {
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struct list_head list;
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void (*seq_print)(struct seq_file *, struct service_level *);
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};
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int register_service_level(struct service_level *);
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int unregister_service_level(struct service_level *);
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#endif /* __ASM_S390_SYSINFO_H */
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