Linux-libre 4.8.2-gnupck-4.8.2-gnu

1 files changed, 471 insertions, 0 deletions

diff --git a/arch/s390/kvm/sthyi.c b/arch/s390/kvm/sthyi.c
new file mode 100644
index 000000000..bd98b7d25
--- /dev/null
+++ b/arch/s390/kvm/sthyi.c
@@ -0,0 +1,471 @@
+/*
+ * store hypervisor information instruction emulation functions.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ *
+ * Copyright IBM Corp. 2016
+ * Author(s): Janosch Frank <frankja@linux.vnet.ibm.com>
+ */
+#include <linux/kvm_host.h>
+#include <linux/errno.h>
+#include <linux/pagemap.h>
+#include <linux/vmalloc.h>
+#include <linux/ratelimit.h>
+
+#include <asm/kvm_host.h>
+#include <asm/asm-offsets.h>
+#include <asm/sclp.h>
+#include <asm/diag.h>
+#include <asm/sysinfo.h>
+#include <asm/ebcdic.h>
+
+#include "kvm-s390.h"
+#include "gaccess.h"
+#include "trace.h"
+
+#define DED_WEIGHT 0xffff
+/*
+ * CP and IFL as EBCDIC strings, SP/0x40 determines the end of string
+ * as they are justified with spaces.
+ */
+#define CP  0xc3d7404040404040UL
+#define IFL 0xc9c6d34040404040UL
+
+enum hdr_flags {
+	HDR_NOT_LPAR   = 0x10,
+	HDR_STACK_INCM = 0x20,
+	HDR_STSI_UNAV  = 0x40,
+	HDR_PERF_UNAV  = 0x80,
+};
+
+enum mac_validity {
+	MAC_NAME_VLD = 0x20,
+	MAC_ID_VLD   = 0x40,
+	MAC_CNT_VLD  = 0x80,
+};
+
+enum par_flag {
+	PAR_MT_EN = 0x80,
+};
+
+enum par_validity {
+	PAR_GRP_VLD  = 0x08,
+	PAR_ID_VLD   = 0x10,
+	PAR_ABS_VLD  = 0x20,
+	PAR_WGHT_VLD = 0x40,
+	PAR_PCNT_VLD  = 0x80,
+};
+
+struct hdr_sctn {
+	u8 infhflg1;
+	u8 infhflg2; /* reserved */
+	u8 infhval1; /* reserved */
+	u8 infhval2; /* reserved */
+	u8 reserved[3];
+	u8 infhygct;
+	u16 infhtotl;
+	u16 infhdln;
+	u16 infmoff;
+	u16 infmlen;
+	u16 infpoff;
+	u16 infplen;
+	u16 infhoff1;
+	u16 infhlen1;
+	u16 infgoff1;
+	u16 infglen1;
+	u16 infhoff2;
+	u16 infhlen2;
+	u16 infgoff2;
+	u16 infglen2;
+	u16 infhoff3;
+	u16 infhlen3;
+	u16 infgoff3;
+	u16 infglen3;
+	u8 reserved2[4];
+} __packed;
+
+struct mac_sctn {
+	u8 infmflg1; /* reserved */
+	u8 infmflg2; /* reserved */
+	u8 infmval1;
+	u8 infmval2; /* reserved */
+	u16 infmscps;
+	u16 infmdcps;
+	u16 infmsifl;
+	u16 infmdifl;
+	char infmname[8];
+	char infmtype[4];
+	char infmmanu[16];
+	char infmseq[16];
+	char infmpman[4];
+	u8 reserved[4];
+} __packed;
+
+struct par_sctn {
+	u8 infpflg1;
+	u8 infpflg2; /* reserved */
+	u8 infpval1;
+	u8 infpval2; /* reserved */
+	u16 infppnum;
+	u16 infpscps;
+	u16 infpdcps;
+	u16 infpsifl;
+	u16 infpdifl;
+	u16 reserved;
+	char infppnam[8];
+	u32 infpwbcp;
+	u32 infpabcp;
+	u32 infpwbif;
+	u32 infpabif;
+	char infplgnm[8];
+	u32 infplgcp;
+	u32 infplgif;
+} __packed;
+
+struct sthyi_sctns {
+	struct hdr_sctn hdr;
+	struct mac_sctn mac;
+	struct par_sctn par;
+} __packed;
+
+struct cpu_inf {
+	u64 lpar_cap;
+	u64 lpar_grp_cap;
+	u64 lpar_weight;
+	u64 all_weight;
+	int cpu_num_ded;
+	int cpu_num_shd;
+};
+
+struct lpar_cpu_inf {
+	struct cpu_inf cp;
+	struct cpu_inf ifl;
+};
+
+static inline u64 cpu_id(u8 ctidx, void *diag224_buf)
+{
+	return *((u64 *)(diag224_buf + (ctidx + 1) * DIAG204_CPU_NAME_LEN));
+}
+
+/*
+ * Scales the cpu capping from the lpar range to the one expected in
+ * sthyi data.
+ *
+ * diag204 reports a cap in hundredths of processor units.
+ * z/VM's range for one core is 0 - 0x10000.
+ */
+static u32 scale_cap(u32 in)
+{
+	return (0x10000 * in) / 100;
+}
+
+static void fill_hdr(struct sthyi_sctns *sctns)
+{
+	sctns->hdr.infhdln = sizeof(sctns->hdr);
+	sctns->hdr.infmoff = sizeof(sctns->hdr);
+	sctns->hdr.infmlen = sizeof(sctns->mac);
+	sctns->hdr.infplen = sizeof(sctns->par);
+	sctns->hdr.infpoff = sctns->hdr.infhdln + sctns->hdr.infmlen;
+	sctns->hdr.infhtotl = sctns->hdr.infpoff + sctns->hdr.infplen;
+}
+
+static void fill_stsi_mac(struct sthyi_sctns *sctns,
+			  struct sysinfo_1_1_1 *sysinfo)
+{
+	if (stsi(sysinfo, 1, 1, 1))
+		return;
+
+	sclp_ocf_cpc_name_copy(sctns->mac.infmname);
+
+	memcpy(sctns->mac.infmtype, sysinfo->type, sizeof(sctns->mac.infmtype));
+	memcpy(sctns->mac.infmmanu, sysinfo->manufacturer, sizeof(sctns->mac.infmmanu));
+	memcpy(sctns->mac.infmpman, sysinfo->plant, sizeof(sctns->mac.infmpman));
+	memcpy(sctns->mac.infmseq, sysinfo->sequence, sizeof(sctns->mac.infmseq));
+
+	sctns->mac.infmval1 |= MAC_ID_VLD | MAC_NAME_VLD;
+}
+
+static void fill_stsi_par(struct sthyi_sctns *sctns,
+			  struct sysinfo_2_2_2 *sysinfo)
+{
+	if (stsi(sysinfo, 2, 2, 2))
+		return;
+
+	sctns->par.infppnum = sysinfo->lpar_number;
+	memcpy(sctns->par.infppnam, sysinfo->name, sizeof(sctns->par.infppnam));
+
+	sctns->par.infpval1 |= PAR_ID_VLD;
+}
+
+static void fill_stsi(struct sthyi_sctns *sctns)
+{
+	void *sysinfo;
+
+	/* Errors are handled through the validity bits in the response. */
+	sysinfo = (void *)__get_free_page(GFP_KERNEL);
+	if (!sysinfo)
+		return;
+
+	fill_stsi_mac(sctns, sysinfo);
+	fill_stsi_par(sctns, sysinfo);
+
+	free_pages((unsigned long)sysinfo, 0);
+}
+
+static void fill_diag_mac(struct sthyi_sctns *sctns,
+			  struct diag204_x_phys_block *block,
+			  void *diag224_buf)
+{
+	int i;
+
+	for (i = 0; i < block->hdr.cpus; i++) {
+		switch (cpu_id(block->cpus[i].ctidx, diag224_buf)) {
+		case CP:
+			if (block->cpus[i].weight == DED_WEIGHT)
+				sctns->mac.infmdcps++;
+			else
+				sctns->mac.infmscps++;
+			break;
+		case IFL:
+			if (block->cpus[i].weight == DED_WEIGHT)
+				sctns->mac.infmdifl++;
+			else
+				sctns->mac.infmsifl++;
+			break;
+		}
+	}
+	sctns->mac.infmval1 |= MAC_CNT_VLD;
+}
+
+/* Returns a pointer to the the next partition block. */
+static struct diag204_x_part_block *lpar_cpu_inf(struct lpar_cpu_inf *part_inf,
+						 bool this_lpar,
+						 void *diag224_buf,
+						 struct diag204_x_part_block *block)
+{
+	int i, capped = 0, weight_cp = 0, weight_ifl = 0;
+	struct cpu_inf *cpu_inf;
+
+	for (i = 0; i < block->hdr.rcpus; i++) {
+		if (!(block->cpus[i].cflag & DIAG204_CPU_ONLINE))
+			continue;
+
+		switch (cpu_id(block->cpus[i].ctidx, diag224_buf)) {
+		case CP:
+			cpu_inf = &part_inf->cp;
+			if (block->cpus[i].cur_weight < DED_WEIGHT)
+				weight_cp |= block->cpus[i].cur_weight;
+			break;
+		case IFL:
+			cpu_inf = &part_inf->ifl;
+			if (block->cpus[i].cur_weight < DED_WEIGHT)
+				weight_ifl |= block->cpus[i].cur_weight;
+			break;
+		default:
+			continue;
+		}
+
+		if (!this_lpar)
+			continue;
+
+		capped |= block->cpus[i].cflag & DIAG204_CPU_CAPPED;
+		cpu_inf->lpar_cap |= block->cpus[i].cpu_type_cap;
+		cpu_inf->lpar_grp_cap |= block->cpus[i].group_cpu_type_cap;
+
+		if (block->cpus[i].weight == DED_WEIGHT)
+			cpu_inf->cpu_num_ded += 1;
+		else
+			cpu_inf->cpu_num_shd += 1;
+	}
+
+	if (this_lpar && capped) {
+		part_inf->cp.lpar_weight = weight_cp;
+		part_inf->ifl.lpar_weight = weight_ifl;
+	}
+	part_inf->cp.all_weight += weight_cp;
+	part_inf->ifl.all_weight += weight_ifl;
+	return (struct diag204_x_part_block *)&block->cpus[i];
+}
+
+static void fill_diag(struct sthyi_sctns *sctns)
+{
+	int i, r, pages;
+	bool this_lpar;
+	void *diag204_buf;
+	void *diag224_buf = NULL;
+	struct diag204_x_info_blk_hdr *ti_hdr;
+	struct diag204_x_part_block *part_block;
+	struct diag204_x_phys_block *phys_block;
+	struct lpar_cpu_inf lpar_inf = {};
+
+	/* Errors are handled through the validity bits in the response. */
+	pages = diag204((unsigned long)DIAG204_SUBC_RSI |
+			(unsigned long)DIAG204_INFO_EXT, 0, NULL);
+	if (pages <= 0)
+		return;
+
+	diag204_buf = vmalloc(PAGE_SIZE * pages);
+	if (!diag204_buf)
+		return;
+
+	r = diag204((unsigned long)DIAG204_SUBC_STIB7 |
+		    (unsigned long)DIAG204_INFO_EXT, pages, diag204_buf);
+	if (r < 0)
+		goto out;
+
+	diag224_buf = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
+	if (!diag224_buf || diag224(diag224_buf))
+		goto out;
+
+	ti_hdr = diag204_buf;
+	part_block = diag204_buf + sizeof(*ti_hdr);
+
+	for (i = 0; i < ti_hdr->npar; i++) {
+		/*
+		 * For the calling lpar we also need to get the cpu
+		 * caps and weights. The time information block header
+		 * specifies the offset to the partition block of the
+		 * caller lpar, so we know when we process its data.
+		 */
+		this_lpar = (void *)part_block - diag204_buf == ti_hdr->this_part;
+		part_block = lpar_cpu_inf(&lpar_inf, this_lpar, diag224_buf,
+					  part_block);
+	}
+
+	phys_block = (struct diag204_x_phys_block *)part_block;
+	part_block = diag204_buf + ti_hdr->this_part;
+	if (part_block->hdr.mtid)
+		sctns->par.infpflg1 = PAR_MT_EN;
+
+	sctns->par.infpval1 |= PAR_GRP_VLD;
+	sctns->par.infplgcp = scale_cap(lpar_inf.cp.lpar_grp_cap);
+	sctns->par.infplgif = scale_cap(lpar_inf.ifl.lpar_grp_cap);
+	memcpy(sctns->par.infplgnm, part_block->hdr.hardware_group_name,
+	       sizeof(sctns->par.infplgnm));
+
+	sctns->par.infpscps = lpar_inf.cp.cpu_num_shd;
+	sctns->par.infpdcps = lpar_inf.cp.cpu_num_ded;
+	sctns->par.infpsifl = lpar_inf.ifl.cpu_num_shd;
+	sctns->par.infpdifl = lpar_inf.ifl.cpu_num_ded;
+	sctns->par.infpval1 |= PAR_PCNT_VLD;
+
+	sctns->par.infpabcp = scale_cap(lpar_inf.cp.lpar_cap);
+	sctns->par.infpabif = scale_cap(lpar_inf.ifl.lpar_cap);
+	sctns->par.infpval1 |= PAR_ABS_VLD;
+
+	/*
+	 * Everything below needs global performance data to be
+	 * meaningful.
+	 */
+	if (!(ti_hdr->flags & DIAG204_LPAR_PHYS_FLG)) {
+		sctns->hdr.infhflg1 |= HDR_PERF_UNAV;
+		goto out;
+	}
+
+	fill_diag_mac(sctns, phys_block, diag224_buf);
+
+	if (lpar_inf.cp.lpar_weight) {
+		sctns->par.infpwbcp = sctns->mac.infmscps * 0x10000 *
+			lpar_inf.cp.lpar_weight / lpar_inf.cp.all_weight;
+	}
+
+	if (lpar_inf.ifl.lpar_weight) {
+		sctns->par.infpwbif = sctns->mac.infmsifl * 0x10000 *
+			lpar_inf.ifl.lpar_weight / lpar_inf.ifl.all_weight;
+	}
+	sctns->par.infpval1 |= PAR_WGHT_VLD;
+
+out:
+	kfree(diag224_buf);
+	vfree(diag204_buf);
+}
+
+static int sthyi(u64 vaddr)
+{
+	register u64 code asm("0") = 0;
+	register u64 addr asm("2") = vaddr;
+	int cc;
+
+	asm volatile(
+		".insn   rre,0xB2560000,%[code],%[addr]\n"
+		"ipm     %[cc]\n"
+		"srl     %[cc],28\n"
+		: [cc] "=d" (cc)
+		: [code] "d" (code), [addr] "a" (addr)
+		: "memory", "cc");
+	return cc;
+}
+
+int handle_sthyi(struct kvm_vcpu *vcpu)
+{
+	int reg1, reg2, r = 0;
+	u64 code, addr, cc = 0;
+	struct sthyi_sctns *sctns = NULL;
+
+	/*
+	 * STHYI requires extensive locking in the higher hypervisors
+	 * and is very computational/memory expensive. Therefore we
+	 * ratelimit the executions per VM.
+	 */
+	if (!__ratelimit(&vcpu->kvm->arch.sthyi_limit)) {
+		kvm_s390_retry_instr(vcpu);
+		return 0;
+	}
+
+	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
+	code = vcpu->run->s.regs.gprs[reg1];
+	addr = vcpu->run->s.regs.gprs[reg2];
+
+	vcpu->stat.instruction_sthyi++;
+	VCPU_EVENT(vcpu, 3, "STHYI: fc: %llu addr: 0x%016llx", code, addr);
+	trace_kvm_s390_handle_sthyi(vcpu, code, addr);
+
+	if (reg1 == reg2 || reg1 & 1 || reg2 & 1 || addr & ~PAGE_MASK)
+		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
+
+	if (code & 0xffff) {
+		cc = 3;
+		goto out;
+	}
+
+	/*
+	 * If the page has not yet been faulted in, we want to do that
+	 * now and not after all the expensive calculations.
+	 */
+	r = write_guest(vcpu, addr, reg2, &cc, 1);
+	if (r)
+		return kvm_s390_inject_prog_cond(vcpu, r);
+
+	sctns = (void *)get_zeroed_page(GFP_KERNEL);
+	if (!sctns)
+		return -ENOMEM;
+
+	/*
+	 * If we are a guest, we don't want to emulate an emulated
+	 * instruction. We ask the hypervisor to provide the data.
+	 */
+	if (test_facility(74)) {
+		cc = sthyi((u64)sctns);
+		goto out;
+	}
+
+	fill_hdr(sctns);
+	fill_stsi(sctns);
+	fill_diag(sctns);
+
+out:
+	if (!cc) {
+		r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE);
+		if (r) {
+			free_page((unsigned long)sctns);
+			return kvm_s390_inject_prog_cond(vcpu, r);
+		}
+	}
+
+	free_page((unsigned long)sctns);
+	vcpu->run->s.regs.gprs[reg2 + 1] = cc ? 4 : 0;
+	kvm_s390_set_psw_cc(vcpu, cc);
+	return r;
+}