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27291e2165
This patch adds support to debug the guest using the PER facility on s390. Single-stepping, hardware breakpoints and hardware watchpoints are supported. In order to use the PER facility of the guest without it noticing it, the control registers of the guest have to be patched and access to them has to be intercepted(stctl, stctg, lctl, lctlg). All PER program interrupts have to be intercepted and only the relevant PER interrupts for the guest have to be given back. Special care has to be taken about repeated exits on the same hardware breakpoint. The intervention of the host in the guests PER configuration is not fully transparent. PER instruction nullification can not be used by the guest and too many storage alteration events may be reported to the guest (if it is activated for special address ranges only) when the host concurrently debugging it. Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
225 lines
7.7 KiB
C
225 lines
7.7 KiB
C
/*
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* definition for kvm on s390
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*
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* Copyright IBM Corp. 2008, 2009
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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): Carsten Otte <cotte@de.ibm.com>
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* Christian Borntraeger <borntraeger@de.ibm.com>
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* Christian Ehrhardt <ehrhardt@de.ibm.com>
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*/
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#ifndef ARCH_S390_KVM_S390_H
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#define ARCH_S390_KVM_S390_H
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#include <linux/hrtimer.h>
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#include <linux/kvm.h>
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#include <linux/kvm_host.h>
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typedef int (*intercept_handler_t)(struct kvm_vcpu *vcpu);
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/* declare vfacilities extern */
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extern unsigned long *vfacilities;
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int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu);
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/* Transactional Memory Execution related macros */
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#define IS_TE_ENABLED(vcpu) ((vcpu->arch.sie_block->ecb & 0x10))
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#define TDB_ADDR 0x1800UL
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#define TDB_FORMAT1 1
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#define IS_ITDB_VALID(vcpu) ((*(char *)vcpu->arch.sie_block->itdba == TDB_FORMAT1))
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#define VM_EVENT(d_kvm, d_loglevel, d_string, d_args...)\
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do { \
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debug_sprintf_event(d_kvm->arch.dbf, d_loglevel, d_string "\n", \
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d_args); \
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} while (0)
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#define VCPU_EVENT(d_vcpu, d_loglevel, d_string, d_args...)\
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do { \
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debug_sprintf_event(d_vcpu->kvm->arch.dbf, d_loglevel, \
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"%02d[%016lx-%016lx]: " d_string "\n", d_vcpu->vcpu_id, \
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d_vcpu->arch.sie_block->gpsw.mask, d_vcpu->arch.sie_block->gpsw.addr,\
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d_args); \
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} while (0)
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static inline int __cpu_is_stopped(struct kvm_vcpu *vcpu)
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{
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return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_STOP_INT;
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}
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static inline int kvm_is_ucontrol(struct kvm *kvm)
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{
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#ifdef CONFIG_KVM_S390_UCONTROL
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if (kvm->arch.gmap)
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return 0;
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return 1;
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#else
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return 0;
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#endif
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}
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static inline void kvm_s390_set_prefix(struct kvm_vcpu *vcpu, u32 prefix)
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{
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vcpu->arch.sie_block->prefix = prefix & 0x7fffe000u;
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vcpu->arch.sie_block->ihcpu = 0xffff;
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kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
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}
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static inline u64 kvm_s390_get_base_disp_s(struct kvm_vcpu *vcpu)
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{
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u32 base2 = vcpu->arch.sie_block->ipb >> 28;
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u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
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return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
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}
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static inline void kvm_s390_get_base_disp_sse(struct kvm_vcpu *vcpu,
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u64 *address1, u64 *address2)
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{
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u32 base1 = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
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u32 disp1 = (vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16;
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u32 base2 = (vcpu->arch.sie_block->ipb & 0xf000) >> 12;
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u32 disp2 = vcpu->arch.sie_block->ipb & 0x0fff;
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*address1 = (base1 ? vcpu->run->s.regs.gprs[base1] : 0) + disp1;
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*address2 = (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
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}
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static inline void kvm_s390_get_regs_rre(struct kvm_vcpu *vcpu, int *r1, int *r2)
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{
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if (r1)
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*r1 = (vcpu->arch.sie_block->ipb & 0x00f00000) >> 20;
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if (r2)
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*r2 = (vcpu->arch.sie_block->ipb & 0x000f0000) >> 16;
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}
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static inline u64 kvm_s390_get_base_disp_rsy(struct kvm_vcpu *vcpu)
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{
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u32 base2 = vcpu->arch.sie_block->ipb >> 28;
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u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16) +
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((vcpu->arch.sie_block->ipb & 0xff00) << 4);
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/* The displacement is a 20bit _SIGNED_ value */
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if (disp2 & 0x80000)
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disp2+=0xfff00000;
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return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + (long)(int)disp2;
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}
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static inline u64 kvm_s390_get_base_disp_rs(struct kvm_vcpu *vcpu)
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{
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u32 base2 = vcpu->arch.sie_block->ipb >> 28;
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u32 disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
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return (base2 ? vcpu->run->s.regs.gprs[base2] : 0) + disp2;
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}
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/* Set the condition code in the guest program status word */
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static inline void kvm_s390_set_psw_cc(struct kvm_vcpu *vcpu, unsigned long cc)
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{
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vcpu->arch.sie_block->gpsw.mask &= ~(3UL << 44);
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vcpu->arch.sie_block->gpsw.mask |= cc << 44;
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}
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int kvm_s390_handle_wait(struct kvm_vcpu *vcpu);
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enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer);
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void kvm_s390_tasklet(unsigned long parm);
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void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu);
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void kvm_s390_deliver_pending_machine_checks(struct kvm_vcpu *vcpu);
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void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu);
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int __must_check kvm_s390_inject_vm(struct kvm *kvm,
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struct kvm_s390_interrupt *s390int);
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int __must_check kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
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struct kvm_s390_interrupt *s390int);
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int __must_check kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code);
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struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
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u64 cr6, u64 schid);
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void kvm_s390_reinject_io_int(struct kvm *kvm,
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struct kvm_s390_interrupt_info *inti);
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int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked);
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/* implemented in priv.c */
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int kvm_s390_handle_b2(struct kvm_vcpu *vcpu);
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int kvm_s390_handle_e5(struct kvm_vcpu *vcpu);
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int kvm_s390_handle_01(struct kvm_vcpu *vcpu);
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int kvm_s390_handle_b9(struct kvm_vcpu *vcpu);
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int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu);
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int kvm_s390_handle_stctl(struct kvm_vcpu *vcpu);
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int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu);
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int kvm_s390_handle_eb(struct kvm_vcpu *vcpu);
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/* implemented in sigp.c */
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int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu);
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/* implemented in kvm-s390.c */
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int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long addr);
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int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr);
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void s390_vcpu_block(struct kvm_vcpu *vcpu);
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void s390_vcpu_unblock(struct kvm_vcpu *vcpu);
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void exit_sie(struct kvm_vcpu *vcpu);
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void exit_sie_sync(struct kvm_vcpu *vcpu);
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int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu);
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void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu);
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/* is cmma enabled */
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bool kvm_s390_cmma_enabled(struct kvm *kvm);
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int test_vfacility(unsigned long nr);
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/* implemented in diag.c */
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int kvm_s390_handle_diag(struct kvm_vcpu *vcpu);
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/* implemented in interrupt.c */
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int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
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struct kvm_s390_pgm_info *pgm_info);
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/**
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* kvm_s390_inject_prog_cond - conditionally inject a program check
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* @vcpu: virtual cpu
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* @rc: original return/error code
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*
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* This function is supposed to be used after regular guest access functions
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* failed, to conditionally inject a program check to a vcpu. The typical
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* pattern would look like
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*
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* rc = write_guest(vcpu, addr, data, len);
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* if (rc)
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* return kvm_s390_inject_prog_cond(vcpu, rc);
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*
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* A negative return code from guest access functions implies an internal error
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* like e.g. out of memory. In these cases no program check should be injected
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* to the guest.
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* A positive value implies that an exception happened while accessing a guest's
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* memory. In this case all data belonging to the corresponding program check
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* has been stored in vcpu->arch.pgm and can be injected with
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* kvm_s390_inject_prog_irq().
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*
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* Returns: - the original @rc value if @rc was negative (internal error)
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* - zero if @rc was already zero
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* - zero or error code from injecting if @rc was positive
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* (program check injected to @vcpu)
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*/
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static inline int kvm_s390_inject_prog_cond(struct kvm_vcpu *vcpu, int rc)
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{
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if (rc <= 0)
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return rc;
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return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
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}
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/* implemented in interrupt.c */
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int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu);
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int psw_extint_disabled(struct kvm_vcpu *vcpu);
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void kvm_s390_destroy_adapters(struct kvm *kvm);
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/* implemented in guestdbg.c */
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void kvm_s390_backup_guest_per_regs(struct kvm_vcpu *vcpu);
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void kvm_s390_restore_guest_per_regs(struct kvm_vcpu *vcpu);
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void kvm_s390_patch_guest_per_regs(struct kvm_vcpu *vcpu);
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int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
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struct kvm_guest_debug *dbg);
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void kvm_s390_clear_bp_data(struct kvm_vcpu *vcpu);
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void kvm_s390_prepare_debug_exit(struct kvm_vcpu *vcpu);
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void kvm_s390_handle_per_event(struct kvm_vcpu *vcpu);
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#endif
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