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linux_dsm_epyc7002/arch/s390/include/asm/kvm_host.h
Matthew Rosato 5a5e65361f KVM: s390: Intercept the tprot instruction 
Based on original patch from Jeng-fang (Nick) Wang

When standby memory is specified for a guest Linux, but no virtual memory has
been allocated on the Qemu host backing that guest, the guest memory detection
process encounters a memory access exception which is not thrown from the KVM
handle_tprot() instruction-handler function. The access exception comes from
sie64a returning EFAULT, which then passes an addressing exception to the guest.
Unfortunately this does not the proper PSW fixup (nullifying vs.
suppressing) so the guest will get a fault for the wrong address.

Let's just intercept the tprot instruction all the time to do the right thing
and not go the page fault handler path for standby memory. tprot is only used
by Linux during startup so some exits should be ok.
Without this patch, standby memory cannot be used with KVM.

Signed-off-by: Nick Wang <jfwang@us.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Tested-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-05-30 09:39:40 +02:00

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/*
* definition for kernel virtual machines on s390
*
* Copyright IBM Corp. 2008, 2009
*
* 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.
*
* Author(s): Carsten Otte <cotte@de.ibm.com>
*/
#ifndef ASM_KVM_HOST_H
#define ASM_KVM_HOST_H
#include <linux/hrtimer.h>
#include <linux/interrupt.h>
#include <linux/kvm_host.h>
#include <linux/kvm.h>
#include <asm/debug.h>
#include <asm/cpu.h>
#include <asm/isc.h>
#define KVM_MAX_VCPUS 64
#define KVM_USER_MEM_SLOTS 32
/*
* These seem to be used for allocating ->chip in the routing table,
* which we don't use. 4096 is an out-of-thin-air value. If we need
* to look at ->chip later on, we'll need to revisit this.
*/
#define KVM_NR_IRQCHIPS 1
#define KVM_IRQCHIP_NUM_PINS 4096
#define SIGP_CTRL_C 0x00800000
struct sca_entry {
atomic_t ctrl;
__u32 reserved;
__u64 sda;
__u64 reserved2[2];
} __attribute__((packed));
union ipte_control {
unsigned long val;
struct {
unsigned long k : 1;
unsigned long kh : 31;
unsigned long kg : 32;
};
};
struct sca_block {
union ipte_control ipte_control;
__u64 reserved[5];
__u64 mcn;
__u64 reserved2;
struct sca_entry cpu[64];
} __attribute__((packed));
#define CPUSTAT_STOPPED 0x80000000
#define CPUSTAT_WAIT 0x10000000
#define CPUSTAT_ECALL_PEND 0x08000000
#define CPUSTAT_STOP_INT 0x04000000
#define CPUSTAT_IO_INT 0x02000000
#define CPUSTAT_EXT_INT 0x01000000
#define CPUSTAT_RUNNING 0x00800000
#define CPUSTAT_RETAINED 0x00400000
#define CPUSTAT_TIMING_SUB 0x00020000
#define CPUSTAT_SIE_SUB 0x00010000
#define CPUSTAT_RRF 0x00008000
#define CPUSTAT_SLSV 0x00004000
#define CPUSTAT_SLSR 0x00002000
#define CPUSTAT_ZARCH 0x00000800
#define CPUSTAT_MCDS 0x00000100
#define CPUSTAT_SM 0x00000080
#define CPUSTAT_IBS 0x00000040
#define CPUSTAT_G 0x00000008
#define CPUSTAT_GED 0x00000004
#define CPUSTAT_J 0x00000002
#define CPUSTAT_P 0x00000001
struct kvm_s390_sie_block {
atomic_t cpuflags; /* 0x0000 */
__u32 : 1; /* 0x0004 */
__u32 prefix : 18;
__u32 : 13;
__u8 reserved08[4]; /* 0x0008 */
#define PROG_IN_SIE (1<<0)
__u32 prog0c; /* 0x000c */
__u8 reserved10[16]; /* 0x0010 */
#define PROG_BLOCK_SIE 0x00000001
atomic_t prog20; /* 0x0020 */
__u8 reserved24[4]; /* 0x0024 */
__u64 cputm; /* 0x0028 */
__u64 ckc; /* 0x0030 */
__u64 epoch; /* 0x0038 */
__u8 reserved40[4]; /* 0x0040 */
#define LCTL_CR0 0x8000
#define LCTL_CR6 0x0200
#define LCTL_CR9 0x0040
#define LCTL_CR10 0x0020
#define LCTL_CR11 0x0010
#define LCTL_CR14 0x0002
__u16 lctl; /* 0x0044 */
__s16 icpua; /* 0x0046 */
#define ICTL_PINT 0x20000000
#define ICTL_LPSW 0x00400000
#define ICTL_STCTL 0x00040000
#define ICTL_ISKE 0x00004000
#define ICTL_SSKE 0x00002000
#define ICTL_RRBE 0x00001000
#define ICTL_TPROT 0x00000200
__u32 ictl; /* 0x0048 */
__u32 eca; /* 0x004c */
#define ICPT_INST 0x04
#define ICPT_PROGI 0x08
#define ICPT_INSTPROGI 0x0C
#define ICPT_OPEREXC 0x2C
#define ICPT_PARTEXEC 0x38
#define ICPT_IOINST 0x40
__u8 icptcode; /* 0x0050 */
__u8 reserved51; /* 0x0051 */
__u16 ihcpu; /* 0x0052 */
__u8 reserved54[2]; /* 0x0054 */
__u16 ipa; /* 0x0056 */
__u32 ipb; /* 0x0058 */
__u32 scaoh; /* 0x005c */
__u8 reserved60; /* 0x0060 */
__u8 ecb; /* 0x0061 */
__u8 ecb2; /* 0x0062 */
__u8 reserved63[1]; /* 0x0063 */
__u32 scaol; /* 0x0064 */
__u8 reserved68[4]; /* 0x0068 */
__u32 todpr; /* 0x006c */
__u8 reserved70[32]; /* 0x0070 */
psw_t gpsw; /* 0x0090 */
__u64 gg14; /* 0x00a0 */
__u64 gg15; /* 0x00a8 */
__u8 reservedb0[20]; /* 0x00b0 */
__u16 extcpuaddr; /* 0x00c4 */
__u16 eic; /* 0x00c6 */
__u32 reservedc8; /* 0x00c8 */
__u16 pgmilc; /* 0x00cc */
__u16 iprcc; /* 0x00ce */
__u32 dxc; /* 0x00d0 */
__u16 mcn; /* 0x00d4 */
__u8 perc; /* 0x00d6 */
__u8 peratmid; /* 0x00d7 */
__u64 peraddr; /* 0x00d8 */
__u8 eai; /* 0x00e0 */
__u8 peraid; /* 0x00e1 */
__u8 oai; /* 0x00e2 */
__u8 armid; /* 0x00e3 */
__u8 reservede4[4]; /* 0x00e4 */
__u64 tecmc; /* 0x00e8 */
__u8 reservedf0[16]; /* 0x00f0 */
__u64 gcr[16]; /* 0x0100 */
__u64 gbea; /* 0x0180 */
__u8 reserved188[24]; /* 0x0188 */
__u32 fac; /* 0x01a0 */
__u8 reserved1a4[20]; /* 0x01a4 */
__u64 cbrlo; /* 0x01b8 */
__u8 reserved1c0[30]; /* 0x01c0 */
__u64 pp; /* 0x01de */
__u8 reserved1e6[2]; /* 0x01e6 */
__u64 itdba; /* 0x01e8 */
__u8 reserved1f0[16]; /* 0x01f0 */
} __attribute__((packed));
struct kvm_s390_itdb {
__u8 data[256];
} __packed;
struct sie_page {
struct kvm_s390_sie_block sie_block;
__u8 reserved200[1024]; /* 0x0200 */
struct kvm_s390_itdb itdb; /* 0x0600 */
__u8 reserved700[2304]; /* 0x0700 */
} __packed;
struct kvm_vcpu_stat {
u32 exit_userspace;
u32 exit_null;
u32 exit_external_request;
u32 exit_external_interrupt;
u32 exit_stop_request;
u32 exit_validity;
u32 exit_instruction;
u32 instruction_lctl;
u32 instruction_lctlg;
u32 instruction_stctl;
u32 instruction_stctg;
u32 exit_program_interruption;
u32 exit_instr_and_program;
u32 deliver_external_call;
u32 deliver_emergency_signal;
u32 deliver_service_signal;
u32 deliver_virtio_interrupt;
u32 deliver_stop_signal;
u32 deliver_prefix_signal;
u32 deliver_restart_signal;
u32 deliver_program_int;
u32 deliver_io_int;
u32 exit_wait_state;
u32 instruction_pfmf;
u32 instruction_stidp;
u32 instruction_spx;
u32 instruction_stpx;
u32 instruction_stap;
u32 instruction_storage_key;
u32 instruction_ipte_interlock;
u32 instruction_stsch;
u32 instruction_chsc;
u32 instruction_stsi;
u32 instruction_stfl;
u32 instruction_tprot;
u32 instruction_essa;
u32 instruction_sigp_sense;
u32 instruction_sigp_sense_running;
u32 instruction_sigp_external_call;
u32 instruction_sigp_emergency;
u32 instruction_sigp_stop;
u32 instruction_sigp_arch;
u32 instruction_sigp_prefix;
u32 instruction_sigp_restart;
u32 diagnose_10;
u32 diagnose_44;
u32 diagnose_9c;
};
#define PGM_OPERATION 0x01
#define PGM_PRIVILEGED_OP 0x02
#define PGM_EXECUTE 0x03
#define PGM_PROTECTION 0x04
#define PGM_ADDRESSING 0x05
#define PGM_SPECIFICATION 0x06
#define PGM_DATA 0x07
#define PGM_FIXED_POINT_OVERFLOW 0x08
#define PGM_FIXED_POINT_DIVIDE 0x09
#define PGM_DECIMAL_OVERFLOW 0x0a
#define PGM_DECIMAL_DIVIDE 0x0b
#define PGM_HFP_EXPONENT_OVERFLOW 0x0c
#define PGM_HFP_EXPONENT_UNDERFLOW 0x0d
#define PGM_HFP_SIGNIFICANCE 0x0e
#define PGM_HFP_DIVIDE 0x0f
#define PGM_SEGMENT_TRANSLATION 0x10
#define PGM_PAGE_TRANSLATION 0x11
#define PGM_TRANSLATION_SPEC 0x12
#define PGM_SPECIAL_OPERATION 0x13
#define PGM_OPERAND 0x15
#define PGM_TRACE_TABEL 0x16
#define PGM_SPACE_SWITCH 0x1c
#define PGM_HFP_SQUARE_ROOT 0x1d
#define PGM_PC_TRANSLATION_SPEC 0x1f
#define PGM_AFX_TRANSLATION 0x20
#define PGM_ASX_TRANSLATION 0x21
#define PGM_LX_TRANSLATION 0x22
#define PGM_EX_TRANSLATION 0x23
#define PGM_PRIMARY_AUTHORITY 0x24
#define PGM_SECONDARY_AUTHORITY 0x25
#define PGM_LFX_TRANSLATION 0x26
#define PGM_LSX_TRANSLATION 0x27
#define PGM_ALET_SPECIFICATION 0x28
#define PGM_ALEN_TRANSLATION 0x29
#define PGM_ALE_SEQUENCE 0x2a
#define PGM_ASTE_VALIDITY 0x2b
#define PGM_ASTE_SEQUENCE 0x2c
#define PGM_EXTENDED_AUTHORITY 0x2d
#define PGM_LSTE_SEQUENCE 0x2e
#define PGM_ASTE_INSTANCE 0x2f
#define PGM_STACK_FULL 0x30
#define PGM_STACK_EMPTY 0x31
#define PGM_STACK_SPECIFICATION 0x32
#define PGM_STACK_TYPE 0x33
#define PGM_STACK_OPERATION 0x34
#define PGM_ASCE_TYPE 0x38
#define PGM_REGION_FIRST_TRANS 0x39
#define PGM_REGION_SECOND_TRANS 0x3a
#define PGM_REGION_THIRD_TRANS 0x3b
#define PGM_MONITOR 0x40
#define PGM_PER 0x80
#define PGM_CRYPTO_OPERATION 0x119
struct kvm_s390_interrupt_info {
struct list_head list;
u64 type;
union {
struct kvm_s390_io_info io;
struct kvm_s390_ext_info ext;
struct kvm_s390_pgm_info pgm;
struct kvm_s390_emerg_info emerg;
struct kvm_s390_extcall_info extcall;
struct kvm_s390_prefix_info prefix;
struct kvm_s390_mchk_info mchk;
};
};
/* for local_interrupt.action_flags */
#define ACTION_STORE_ON_STOP (1<<0)
#define ACTION_STOP_ON_STOP (1<<1)
struct kvm_s390_local_interrupt {
spinlock_t lock;
struct list_head list;
atomic_t active;
struct kvm_s390_float_interrupt *float_int;
int timer_due; /* event indicator for waitqueue below */
wait_queue_head_t *wq;
atomic_t *cpuflags;
unsigned int action_bits;
};
struct kvm_s390_float_interrupt {
spinlock_t lock;
struct list_head list;
atomic_t active;
int next_rr_cpu;
unsigned long idle_mask[BITS_TO_LONGS(KVM_MAX_VCPUS)];
unsigned int irq_count;
};
struct kvm_hw_wp_info_arch {
unsigned long addr;
unsigned long phys_addr;
int len;
char *old_data;
};
struct kvm_hw_bp_info_arch {
unsigned long addr;
int len;
};
/*
* Only the upper 16 bits of kvm_guest_debug->control are arch specific.
* Further KVM_GUESTDBG flags which an be used from userspace can be found in
* arch/s390/include/uapi/asm/kvm.h
*/
#define KVM_GUESTDBG_EXIT_PENDING 0x10000000
#define guestdbg_enabled(vcpu) \
(vcpu->guest_debug & KVM_GUESTDBG_ENABLE)
#define guestdbg_sstep_enabled(vcpu) \
(vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
#define guestdbg_hw_bp_enabled(vcpu) \
(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
#define guestdbg_exit_pending(vcpu) (guestdbg_enabled(vcpu) && \
(vcpu->guest_debug & KVM_GUESTDBG_EXIT_PENDING))
struct kvm_guestdbg_info_arch {
unsigned long cr0;
unsigned long cr9;
unsigned long cr10;
unsigned long cr11;
struct kvm_hw_bp_info_arch *hw_bp_info;
struct kvm_hw_wp_info_arch *hw_wp_info;
int nr_hw_bp;
int nr_hw_wp;
unsigned long last_bp;
};
struct kvm_vcpu_arch {
struct kvm_s390_sie_block *sie_block;
s390_fp_regs host_fpregs;
unsigned int host_acrs[NUM_ACRS];
s390_fp_regs guest_fpregs;
struct kvm_s390_local_interrupt local_int;
struct hrtimer ckc_timer;
struct tasklet_struct tasklet;
struct kvm_s390_pgm_info pgm;
union {
struct cpuid cpu_id;
u64 stidp_data;
};
struct gmap *gmap;
struct kvm_guestdbg_info_arch guestdbg;
#define KVM_S390_PFAULT_TOKEN_INVALID (-1UL)
unsigned long pfault_token;
unsigned long pfault_select;
unsigned long pfault_compare;
};
struct kvm_vm_stat {
u32 remote_tlb_flush;
};
struct kvm_arch_memory_slot {
};
struct s390_map_info {
struct list_head list;
__u64 guest_addr;
__u64 addr;
struct page *page;
};
struct s390_io_adapter {
unsigned int id;
int isc;
bool maskable;
bool masked;
bool swap;
struct rw_semaphore maps_lock;
struct list_head maps;
atomic_t nr_maps;
};
#define MAX_S390_IO_ADAPTERS ((MAX_ISC + 1) * 8)
#define MAX_S390_ADAPTER_MAPS 256
struct kvm_arch{
struct sca_block *sca;
debug_info_t *dbf;
struct kvm_s390_float_interrupt float_int;
struct kvm_device *flic;
struct gmap *gmap;
int css_support;
int use_irqchip;
int use_cmma;
struct s390_io_adapter *adapters[MAX_S390_IO_ADAPTERS];
wait_queue_head_t ipte_wq;
spinlock_t start_stop_lock;
};
#define KVM_HVA_ERR_BAD (-1UL)
#define KVM_HVA_ERR_RO_BAD (-2UL)
static inline bool kvm_is_error_hva(unsigned long addr)
{
return IS_ERR_VALUE(addr);
}
#define ASYNC_PF_PER_VCPU 64
struct kvm_vcpu;
struct kvm_async_pf;
struct kvm_arch_async_pf {
unsigned long pfault_token;
};
bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu);
void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
struct kvm_async_pf *work);
void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
struct kvm_async_pf *work);
void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
struct kvm_async_pf *work);
extern int sie64a(struct kvm_s390_sie_block *, u64 *);
extern char sie_exit;
#endif
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