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Merge branch 'sthyi' into features 

Add the store-hypervisor-information code into features
using a tip branch for parallel merging into the KVM tree.
This commit is contained in:
Martin Schwidefsky 2017-10-09 11:16:49 +02:00
parent 91a1fad759 3d8757b87d
commit 3bdf5679c9
13 changed files with 188 additions and 77 deletions
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1
arch/s390/include/asm/kvm_host.h
View File

@ -736,7 +736,6 @@ struct kvm_arch{
wait_queue_head_t ipte_wq;
int ipte_lock_count;
struct mutex ipte_mutex;
struct ratelimit_state sthyi_limit;
spinlock_t start_stop_lock;
struct sie_page2 *sie_page2;
struct kvm_s390_cpu_model model;

1
arch/s390/include/asm/sysinfo.h
View File

@ -199,4 +199,5 @@ struct service_level {
int register_service_level(struct service_level *);
int unregister_service_level(struct service_level *);
int sthyi_fill(void *dst, u64 *rc);
#endif /* __ASM_S390_SYSINFO_H */

6
arch/s390/include/uapi/asm/sthyi.h Normal file
View File

@ -0,0 +1,6 @@
#ifndef _UAPI_ASM_STHYI_H
#define _UAPI_ASM_STHYI_H
#define STHYI_FC_CP_IFL_CAP 0
#endif /* _UAPI_ASM_STHYI_H */

3
arch/s390/include/uapi/asm/unistd.h
View File

@ -315,7 +315,8 @@
#define __NR_pwritev2 377
#define __NR_s390_guarded_storage 378
#define __NR_statx 379
#define NR_syscalls 380
#define __NR_s390_sthyi 380
#define NR_syscalls 381
/*
* There are some system calls that are not present on 64 bit, some

2
arch/s390/kernel/Makefile
View File

@ -57,7 +57,7 @@ obj-y := traps.o time.o process.o base.o early.o setup.o idle.o vtime.o
obj-y += processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o
obj-y += debug.o irq.o ipl.o dis.o diag.o vdso.o als.o
obj-y += sysinfo.o jump_label.o lgr.o os_info.o machine_kexec.o pgm_check.o
obj-y += runtime_instr.o cache.o fpu.o dumpstack.o guarded_storage.o
obj-y += runtime_instr.o cache.o fpu.o dumpstack.o guarded_storage.o sthyi.o
obj-y += entry.o reipl.o relocate_kernel.o kdebugfs.o
extra-y += head.o head64.o vmlinux.lds

1
arch/s390/kernel/compat_wrapper.c
View File

@ -180,3 +180,4 @@ COMPAT_SYSCALL_WRAP3(mlock2, unsigned long, start, size_t, len, int, flags);
COMPAT_SYSCALL_WRAP6(copy_file_range, int, fd_in, loff_t __user *, off_in, int, fd_out, loff_t __user *, off_out, size_t, len, unsigned int, flags);
COMPAT_SYSCALL_WRAP2(s390_guarded_storage, int, command, struct gs_cb *, gs_cb);
COMPAT_SYSCALL_WRAP5(statx, int, dfd, const char __user *, path, unsigned, flags, unsigned, mask, struct statx __user *, buffer);
COMPAT_SYSCALL_WRAP4(s390_sthyi, unsigned long, code, void __user *, info, u64 __user *, rc, unsigned long, flags);

1
arch/s390/kernel/entry.h
View File

@ -77,6 +77,7 @@ long sys_s390_runtime_instr(int command, int signum);
long sys_s390_guarded_storage(int command, struct gs_cb __user *);
long sys_s390_pci_mmio_write(unsigned long, const void __user *, size_t);
long sys_s390_pci_mmio_read(unsigned long, void __user *, size_t);
long sys_s390_sthyi(unsigned long function_code, void __user *buffer, u64 __user *return_code, unsigned long flags);
DECLARE_PER_CPU(u64, mt_cycles[8]);

184
arch/s390/kvm/sthyi.c → arch/s390/kernel/sthyi.c
View File

@ -8,22 +8,19 @@
* 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 <linux/syscalls.h>
#include <linux/mutex.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"
#include <asm/facility.h>
#include <asm/sthyi.h>
#include "entry.h"
#define DED_WEIGHT 0xffff
/*
@ -144,6 +141,21 @@ struct lpar_cpu_inf {
struct cpu_inf ifl;
};
/*
* STHYI requires extensive locking in the higher hypervisors
* and is very computational/memory expensive. Therefore we
* cache the retrieved data whose valid period is 1s.
*/
#define CACHE_VALID_JIFFIES HZ
struct sthyi_info {
void *info;
unsigned long end;
};
static DEFINE_MUTEX(sthyi_mutex);
static struct sthyi_info sthyi_cache;
static inline u64 cpu_id(u8 ctidx, void *diag224_buf)
{
return *((u64 *)(diag224_buf + (ctidx + 1) * DIAG204_CPU_NAME_LEN));
@ -382,88 +394,124 @@ out:
vfree(diag204_buf);
}
static int sthyi(u64 vaddr)
static int sthyi(u64 vaddr, u64 *rc)
{
register u64 code asm("0") = 0;
register u64 addr asm("2") = vaddr;
register u64 rcode asm("3");
int cc;
asm volatile(
".insn rre,0xB2560000,%[code],%[addr]\n"
"ipm %[cc]\n"
"srl %[cc],28\n"
: [cc] "=d" (cc)
: [cc] "=d" (cc), "=d" (rcode)
: [code] "d" (code), [addr] "a" (addr)
: "3", "memory", "cc");
: "memory", "cc");
*rc = rcode;
return cc;
}
int handle_sthyi(struct kvm_vcpu *vcpu)
static int fill_dst(void *dst, u64 *rc)
{
int reg1, reg2, r = 0;
u64 code, addr, cc = 0;
struct sthyi_sctns *sctns = NULL;
if (!test_kvm_facility(vcpu->kvm, 74))
return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
struct sthyi_sctns *sctns = (struct sthyi_sctns *)dst;
/*
* STHYI requires extensive locking in the higher hypervisors
* and is very computational/memory expensive. Therefore we
* ratelimit the executions per VM.
* If the facility is on, we don't want to emulate the instruction.
* We ask the hypervisor to provide the data.
*/
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)
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
if (code & 0xffff) {
cc = 3;
goto out;
}
if (addr & ~PAGE_MASK)
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
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;
}
if (test_facility(74))
return sthyi((u64)dst, rc);
fill_hdr(sctns);
fill_stsi(sctns);
fill_diag(sctns);
*rc = 0;
return 0;
}
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);
}
}
static int sthyi_init_cache(void)
{
if (sthyi_cache.info)
return 0;
sthyi_cache.info = (void *)get_zeroed_page(GFP_KERNEL);
if (!sthyi_cache.info)
return -ENOMEM;
sthyi_cache.end = jiffies - 1; /* expired */
return 0;
}
free_page((unsigned long)sctns);
vcpu->run->s.regs.gprs[reg2 + 1] = cc ? 4 : 0;
kvm_s390_set_psw_cc(vcpu, cc);
static int sthyi_update_cache(u64 *rc)
{
int r;
memset(sthyi_cache.info, 0, PAGE_SIZE);
r = fill_dst(sthyi_cache.info, rc);
if (r)
return r;
sthyi_cache.end = jiffies + CACHE_VALID_JIFFIES;
return r;
}
/*
* sthyi_fill - Fill page with data returned by the STHYI instruction
*
* @dst: Pointer to zeroed page
* @rc: Pointer for storing the return code of the instruction
*
* Fills the destination with system information returned by the STHYI
* instruction. The data is generated by emulation or execution of STHYI,
* if available. The return value is the condition code that would be
* returned, the rc parameter is the return code which is passed in
* register R2 + 1.
*/
int sthyi_fill(void *dst, u64 *rc)
{
int r;
mutex_lock(&sthyi_mutex);
r = sthyi_init_cache();
if (r)
goto out;
if (time_is_before_jiffies(sthyi_cache.end)) {
/* cache expired */
r = sthyi_update_cache(rc);
if (r)
goto out;
}
*rc = 0;
memcpy(dst, sthyi_cache.info, PAGE_SIZE);
out:
mutex_unlock(&sthyi_mutex);
return r;
}
EXPORT_SYMBOL_GPL(sthyi_fill);
SYSCALL_DEFINE4(s390_sthyi, unsigned long, function_code, void __user *, buffer,
u64 __user *, return_code, unsigned long, flags)
{
u64 sthyi_rc;
void *info;
int r;
if (flags)
return -EINVAL;
if (function_code != STHYI_FC_CP_IFL_CAP)
return -EOPNOTSUPP;
info = (void *)get_zeroed_page(GFP_KERNEL);
if (!info)
return -ENOMEM;
r = sthyi_fill(info, &sthyi_rc);
if (r < 0)
goto out;
if (return_code && put_user(sthyi_rc, return_code)) {
r = -EFAULT;
goto out;
}
if (copy_to_user(buffer, info, PAGE_SIZE))
r = -EFAULT;
out:
free_page((unsigned long)info);
return r;
}

1
arch/s390/kernel/syscalls.S
View File

@ -388,3 +388,4 @@ SYSCALL(sys_preadv2,compat_sys_preadv2)
SYSCALL(sys_pwritev2,compat_sys_pwritev2)
SYSCALL(sys_s390_guarded_storage,compat_sys_s390_guarded_storage) /* 378 */
SYSCALL(sys_statx,compat_sys_statx)
SYSCALL(sys_s390_sthyi,compat_sys_s390_sthyi)

2
arch/s390/kvm/Makefile
View File

@ -12,6 +12,6 @@ common-objs = $(KVM)/kvm_main.o $(KVM)/eventfd.o $(KVM)/async_pf.o $(KVM)/irqch
ccflags-y := -Ivirt/kvm -Iarch/s390/kvm
kvm-objs := $(common-objs) kvm-s390.o intercept.o interrupt.o priv.o sigp.o
kvm-objs += diag.o gaccess.o guestdbg.o sthyi.o vsie.o
kvm-objs += diag.o gaccess.o guestdbg.o vsie.o
obj-$(CONFIG_KVM) += kvm.o

56
arch/s390/kvm/intercept.c
View File

@ -18,6 +18,7 @@
#include <asm/kvm_host.h>
#include <asm/asm-offsets.h>
#include <asm/irq.h>
#include <asm/sysinfo.h>
#include "kvm-s390.h"
#include "gaccess.h"
@ -360,6 +361,61 @@ static int handle_partial_execution(struct kvm_vcpu *vcpu)
return -EOPNOTSUPP;
}
/*
* Handle the sthyi instruction that provides the guest with system
* information, like current CPU resources available at each level of
* the machine.
*/
int handle_sthyi(struct kvm_vcpu *vcpu)
{
int reg1, reg2, r = 0;
u64 code, addr, cc = 0, rc = 0;
struct sthyi_sctns *sctns = NULL;
if (!test_kvm_facility(vcpu->kvm, 74))
return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
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)
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
if (code & 0xffff) {
cc = 3;
rc = 4;
goto out;
}
if (addr & ~PAGE_MASK)
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
sctns = (void *)get_zeroed_page(GFP_KERNEL);
if (!sctns)
return -ENOMEM;
cc = sthyi_fill(sctns, &rc);
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] = rc;
kvm_s390_set_psw_cc(vcpu, cc);
return r;
}
static int handle_operexc(struct kvm_vcpu *vcpu)
{
psw_t oldpsw, newpsw;

2
arch/s390/kvm/kvm-s390.c
View File

@ -1884,8 +1884,6 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
rc = -ENOMEM;
ratelimit_state_init(&kvm->arch.sthyi_limit, 5 * HZ, 500);
kvm->arch.use_esca = 0; /* start with basic SCA */
if (!sclp.has_64bscao)
alloc_flags |= GFP_DMA;

5
arch/s390/kvm/kvm-s390.h
View File

@ -242,6 +242,8 @@ static inline void kvm_s390_retry_instr(struct kvm_vcpu *vcpu)
kvm_s390_rewind_psw(vcpu, kvm_s390_get_ilen(vcpu));
}
int handle_sthyi(struct kvm_vcpu *vcpu);
/* implemented in priv.c */
int is_valid_psw(psw_t *psw);
int kvm_s390_handle_aa(struct kvm_vcpu *vcpu);
@ -268,9 +270,6 @@ void kvm_s390_vsie_destroy(struct kvm *kvm);
int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu);
int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu);
/* implemented in sthyi.c */
int handle_sthyi(struct kvm_vcpu *vcpu);
/* implemented in kvm-s390.c */
void kvm_s390_set_tod_clock_ext(struct kvm *kvm,
const struct kvm_s390_vm_tod_clock *gtod);