472 lines
11 KiB
C
472 lines
11 KiB
C
/*
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* store hypervisor information instruction emulation functions.
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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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* Copyright IBM Corp. 2016
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* Author(s): Janosch Frank <frankja@linux.vnet.ibm.com>
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*/
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#include <linux/kvm_host.h>
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#include <linux/errno.h>
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#include <linux/pagemap.h>
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#include <linux/vmalloc.h>
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#include <linux/ratelimit.h>
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#include <asm/kvm_host.h>
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#include <asm/asm-offsets.h>
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#include <asm/sclp.h>
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#include <asm/diag.h>
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#include <asm/sysinfo.h>
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#include <asm/ebcdic.h>
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#include "kvm-s390.h"
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#include "gaccess.h"
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#include "trace.h"
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#define DED_WEIGHT 0xffff
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/*
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* CP and IFL as EBCDIC strings, SP/0x40 determines the end of string
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* as they are justified with spaces.
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*/
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#define CP 0xc3d7404040404040UL
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#define IFL 0xc9c6d34040404040UL
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enum hdr_flags {
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HDR_NOT_LPAR = 0x10,
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HDR_STACK_INCM = 0x20,
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HDR_STSI_UNAV = 0x40,
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HDR_PERF_UNAV = 0x80,
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};
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enum mac_validity {
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MAC_NAME_VLD = 0x20,
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MAC_ID_VLD = 0x40,
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MAC_CNT_VLD = 0x80,
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};
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enum par_flag {
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PAR_MT_EN = 0x80,
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};
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enum par_validity {
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PAR_GRP_VLD = 0x08,
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PAR_ID_VLD = 0x10,
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PAR_ABS_VLD = 0x20,
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PAR_WGHT_VLD = 0x40,
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PAR_PCNT_VLD = 0x80,
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};
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struct hdr_sctn {
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u8 infhflg1;
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u8 infhflg2; /* reserved */
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u8 infhval1; /* reserved */
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u8 infhval2; /* reserved */
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u8 reserved[3];
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u8 infhygct;
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u16 infhtotl;
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u16 infhdln;
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u16 infmoff;
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u16 infmlen;
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u16 infpoff;
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u16 infplen;
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u16 infhoff1;
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u16 infhlen1;
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u16 infgoff1;
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u16 infglen1;
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u16 infhoff2;
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u16 infhlen2;
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u16 infgoff2;
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u16 infglen2;
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u16 infhoff3;
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u16 infhlen3;
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u16 infgoff3;
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u16 infglen3;
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u8 reserved2[4];
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} __packed;
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struct mac_sctn {
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u8 infmflg1; /* reserved */
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u8 infmflg2; /* reserved */
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u8 infmval1;
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u8 infmval2; /* reserved */
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u16 infmscps;
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u16 infmdcps;
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u16 infmsifl;
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u16 infmdifl;
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char infmname[8];
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char infmtype[4];
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char infmmanu[16];
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char infmseq[16];
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char infmpman[4];
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u8 reserved[4];
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} __packed;
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struct par_sctn {
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u8 infpflg1;
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u8 infpflg2; /* reserved */
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u8 infpval1;
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u8 infpval2; /* reserved */
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u16 infppnum;
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u16 infpscps;
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u16 infpdcps;
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u16 infpsifl;
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u16 infpdifl;
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u16 reserved;
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char infppnam[8];
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u32 infpwbcp;
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u32 infpabcp;
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u32 infpwbif;
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u32 infpabif;
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char infplgnm[8];
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u32 infplgcp;
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u32 infplgif;
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} __packed;
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struct sthyi_sctns {
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struct hdr_sctn hdr;
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struct mac_sctn mac;
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struct par_sctn par;
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} __packed;
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struct cpu_inf {
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u64 lpar_cap;
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u64 lpar_grp_cap;
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u64 lpar_weight;
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u64 all_weight;
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int cpu_num_ded;
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int cpu_num_shd;
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};
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struct lpar_cpu_inf {
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struct cpu_inf cp;
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struct cpu_inf ifl;
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};
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static inline u64 cpu_id(u8 ctidx, void *diag224_buf)
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{
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return *((u64 *)(diag224_buf + (ctidx + 1) * DIAG204_CPU_NAME_LEN));
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}
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/*
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* Scales the cpu capping from the lpar range to the one expected in
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* sthyi data.
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*
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* diag204 reports a cap in hundredths of processor units.
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* z/VM's range for one core is 0 - 0x10000.
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*/
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static u32 scale_cap(u32 in)
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{
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return (0x10000 * in) / 100;
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}
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static void fill_hdr(struct sthyi_sctns *sctns)
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{
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sctns->hdr.infhdln = sizeof(sctns->hdr);
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sctns->hdr.infmoff = sizeof(sctns->hdr);
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sctns->hdr.infmlen = sizeof(sctns->mac);
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sctns->hdr.infplen = sizeof(sctns->par);
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sctns->hdr.infpoff = sctns->hdr.infhdln + sctns->hdr.infmlen;
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sctns->hdr.infhtotl = sctns->hdr.infpoff + sctns->hdr.infplen;
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}
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static void fill_stsi_mac(struct sthyi_sctns *sctns,
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struct sysinfo_1_1_1 *sysinfo)
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{
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if (stsi(sysinfo, 1, 1, 1))
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return;
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sclp_ocf_cpc_name_copy(sctns->mac.infmname);
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memcpy(sctns->mac.infmtype, sysinfo->type, sizeof(sctns->mac.infmtype));
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memcpy(sctns->mac.infmmanu, sysinfo->manufacturer, sizeof(sctns->mac.infmmanu));
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memcpy(sctns->mac.infmpman, sysinfo->plant, sizeof(sctns->mac.infmpman));
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memcpy(sctns->mac.infmseq, sysinfo->sequence, sizeof(sctns->mac.infmseq));
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sctns->mac.infmval1 |= MAC_ID_VLD | MAC_NAME_VLD;
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}
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static void fill_stsi_par(struct sthyi_sctns *sctns,
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struct sysinfo_2_2_2 *sysinfo)
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{
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if (stsi(sysinfo, 2, 2, 2))
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return;
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sctns->par.infppnum = sysinfo->lpar_number;
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memcpy(sctns->par.infppnam, sysinfo->name, sizeof(sctns->par.infppnam));
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sctns->par.infpval1 |= PAR_ID_VLD;
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}
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static void fill_stsi(struct sthyi_sctns *sctns)
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{
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void *sysinfo;
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/* Errors are handled through the validity bits in the response. */
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sysinfo = (void *)__get_free_page(GFP_KERNEL);
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if (!sysinfo)
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return;
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fill_stsi_mac(sctns, sysinfo);
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fill_stsi_par(sctns, sysinfo);
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free_pages((unsigned long)sysinfo, 0);
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}
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static void fill_diag_mac(struct sthyi_sctns *sctns,
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struct diag204_x_phys_block *block,
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void *diag224_buf)
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{
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int i;
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for (i = 0; i < block->hdr.cpus; i++) {
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switch (cpu_id(block->cpus[i].ctidx, diag224_buf)) {
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case CP:
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if (block->cpus[i].weight == DED_WEIGHT)
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sctns->mac.infmdcps++;
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else
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sctns->mac.infmscps++;
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break;
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case IFL:
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if (block->cpus[i].weight == DED_WEIGHT)
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sctns->mac.infmdifl++;
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else
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sctns->mac.infmsifl++;
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break;
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}
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}
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sctns->mac.infmval1 |= MAC_CNT_VLD;
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}
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/* Returns a pointer to the the next partition block. */
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static struct diag204_x_part_block *lpar_cpu_inf(struct lpar_cpu_inf *part_inf,
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bool this_lpar,
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void *diag224_buf,
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struct diag204_x_part_block *block)
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{
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int i, capped = 0, weight_cp = 0, weight_ifl = 0;
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struct cpu_inf *cpu_inf;
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for (i = 0; i < block->hdr.rcpus; i++) {
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if (!(block->cpus[i].cflag & DIAG204_CPU_ONLINE))
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continue;
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switch (cpu_id(block->cpus[i].ctidx, diag224_buf)) {
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case CP:
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cpu_inf = &part_inf->cp;
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if (block->cpus[i].cur_weight < DED_WEIGHT)
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weight_cp |= block->cpus[i].cur_weight;
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break;
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case IFL:
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cpu_inf = &part_inf->ifl;
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if (block->cpus[i].cur_weight < DED_WEIGHT)
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weight_ifl |= block->cpus[i].cur_weight;
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break;
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default:
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continue;
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}
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if (!this_lpar)
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continue;
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capped |= block->cpus[i].cflag & DIAG204_CPU_CAPPED;
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cpu_inf->lpar_cap |= block->cpus[i].cpu_type_cap;
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cpu_inf->lpar_grp_cap |= block->cpus[i].group_cpu_type_cap;
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if (block->cpus[i].weight == DED_WEIGHT)
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cpu_inf->cpu_num_ded += 1;
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else
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cpu_inf->cpu_num_shd += 1;
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}
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if (this_lpar && capped) {
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part_inf->cp.lpar_weight = weight_cp;
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part_inf->ifl.lpar_weight = weight_ifl;
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}
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part_inf->cp.all_weight += weight_cp;
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part_inf->ifl.all_weight += weight_ifl;
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return (struct diag204_x_part_block *)&block->cpus[i];
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}
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static void fill_diag(struct sthyi_sctns *sctns)
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{
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int i, r, pages;
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bool this_lpar;
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void *diag204_buf;
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void *diag224_buf = NULL;
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struct diag204_x_info_blk_hdr *ti_hdr;
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struct diag204_x_part_block *part_block;
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struct diag204_x_phys_block *phys_block;
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struct lpar_cpu_inf lpar_inf = {};
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/* Errors are handled through the validity bits in the response. */
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pages = diag204((unsigned long)DIAG204_SUBC_RSI |
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(unsigned long)DIAG204_INFO_EXT, 0, NULL);
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if (pages <= 0)
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return;
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diag204_buf = vmalloc(PAGE_SIZE * pages);
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if (!diag204_buf)
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return;
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r = diag204((unsigned long)DIAG204_SUBC_STIB7 |
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(unsigned long)DIAG204_INFO_EXT, pages, diag204_buf);
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if (r < 0)
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goto out;
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diag224_buf = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
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if (!diag224_buf || diag224(diag224_buf))
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goto out;
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ti_hdr = diag204_buf;
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part_block = diag204_buf + sizeof(*ti_hdr);
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for (i = 0; i < ti_hdr->npar; i++) {
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/*
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* For the calling lpar we also need to get the cpu
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* caps and weights. The time information block header
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* specifies the offset to the partition block of the
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* caller lpar, so we know when we process its data.
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*/
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this_lpar = (void *)part_block - diag204_buf == ti_hdr->this_part;
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part_block = lpar_cpu_inf(&lpar_inf, this_lpar, diag224_buf,
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part_block);
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}
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phys_block = (struct diag204_x_phys_block *)part_block;
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part_block = diag204_buf + ti_hdr->this_part;
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if (part_block->hdr.mtid)
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sctns->par.infpflg1 = PAR_MT_EN;
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sctns->par.infpval1 |= PAR_GRP_VLD;
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sctns->par.infplgcp = scale_cap(lpar_inf.cp.lpar_grp_cap);
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sctns->par.infplgif = scale_cap(lpar_inf.ifl.lpar_grp_cap);
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memcpy(sctns->par.infplgnm, part_block->hdr.hardware_group_name,
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sizeof(sctns->par.infplgnm));
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sctns->par.infpscps = lpar_inf.cp.cpu_num_shd;
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sctns->par.infpdcps = lpar_inf.cp.cpu_num_ded;
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sctns->par.infpsifl = lpar_inf.ifl.cpu_num_shd;
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sctns->par.infpdifl = lpar_inf.ifl.cpu_num_ded;
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sctns->par.infpval1 |= PAR_PCNT_VLD;
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sctns->par.infpabcp = scale_cap(lpar_inf.cp.lpar_cap);
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sctns->par.infpabif = scale_cap(lpar_inf.ifl.lpar_cap);
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sctns->par.infpval1 |= PAR_ABS_VLD;
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/*
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* Everything below needs global performance data to be
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* meaningful.
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*/
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if (!(ti_hdr->flags & DIAG204_LPAR_PHYS_FLG)) {
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sctns->hdr.infhflg1 |= HDR_PERF_UNAV;
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goto out;
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}
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fill_diag_mac(sctns, phys_block, diag224_buf);
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if (lpar_inf.cp.lpar_weight) {
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sctns->par.infpwbcp = sctns->mac.infmscps * 0x10000 *
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lpar_inf.cp.lpar_weight / lpar_inf.cp.all_weight;
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}
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if (lpar_inf.ifl.lpar_weight) {
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sctns->par.infpwbif = sctns->mac.infmsifl * 0x10000 *
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lpar_inf.ifl.lpar_weight / lpar_inf.ifl.all_weight;
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}
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sctns->par.infpval1 |= PAR_WGHT_VLD;
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out:
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kfree(diag224_buf);
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vfree(diag204_buf);
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}
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static int sthyi(u64 vaddr)
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{
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register u64 code asm("0") = 0;
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register u64 addr asm("2") = vaddr;
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int cc;
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asm volatile(
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".insn rre,0xB2560000,%[code],%[addr]\n"
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"ipm %[cc]\n"
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"srl %[cc],28\n"
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: [cc] "=d" (cc)
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: [code] "d" (code), [addr] "a" (addr)
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: "memory", "cc");
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return cc;
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}
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int handle_sthyi(struct kvm_vcpu *vcpu)
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{
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int reg1, reg2, r = 0;
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u64 code, addr, cc = 0;
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struct sthyi_sctns *sctns = NULL;
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/*
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* STHYI requires extensive locking in the higher hypervisors
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* and is very computational/memory expensive. Therefore we
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* ratelimit the executions per VM.
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*/
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if (!__ratelimit(&vcpu->kvm->arch.sthyi_limit)) {
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kvm_s390_retry_instr(vcpu);
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return 0;
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}
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kvm_s390_get_regs_rre(vcpu, ®1, ®2);
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code = vcpu->run->s.regs.gprs[reg1];
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addr = vcpu->run->s.regs.gprs[reg2];
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vcpu->stat.instruction_sthyi++;
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VCPU_EVENT(vcpu, 3, "STHYI: fc: %llu addr: 0x%016llx", code, addr);
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trace_kvm_s390_handle_sthyi(vcpu, code, addr);
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if (reg1 == reg2 || reg1 & 1 || reg2 & 1 || addr & ~PAGE_MASK)
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return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
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if (code & 0xffff) {
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cc = 3;
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goto out;
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}
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/*
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* If the page has not yet been faulted in, we want to do that
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* now and not after all the expensive calculations.
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*/
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r = write_guest(vcpu, addr, reg2, &cc, 1);
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if (r)
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return kvm_s390_inject_prog_cond(vcpu, r);
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sctns = (void *)get_zeroed_page(GFP_KERNEL);
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if (!sctns)
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return -ENOMEM;
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/*
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* If we are a guest, we don't want to emulate an emulated
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* instruction. We ask the hypervisor to provide the data.
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*/
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if (test_facility(74)) {
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cc = sthyi((u64)sctns);
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goto out;
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}
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fill_hdr(sctns);
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fill_stsi(sctns);
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fill_diag(sctns);
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out:
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if (!cc) {
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r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE);
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if (r) {
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free_page((unsigned long)sctns);
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return kvm_s390_inject_prog_cond(vcpu, r);
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}
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}
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free_page((unsigned long)sctns);
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vcpu->run->s.regs.gprs[reg2 + 1] = cc ? 4 : 0;
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kvm_s390_set_psw_cc(vcpu, cc);
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return r;
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}
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