forked from Minki/linux
5b3e5e5bf2
Adds a new important function in the main KVM/ARM code called handle_exit() which is called from kvm_arch_vcpu_ioctl_run() on returns from guest execution. This function examines the Hyp-Syndrome-Register (HSR), which contains information telling KVM what caused the exit from the guest. Some of the reasons for an exit are CP15 accesses, which are not allowed from the guest and this commit handles these exits by emulating the intended operation in software and skipping the guest instruction. Minor notes about the coproc register reset: 1) We reserve a value of 0 as an invalid cp15 offset, to catch bugs in our table, at cost of 4 bytes per vcpu. 2) Added comments on the table indicating how we handle each register, for simplicity of understanding. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
189 lines
4.0 KiB
C
189 lines
4.0 KiB
C
#if !defined(_TRACE_KVM_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_KVM_H
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#include <linux/tracepoint.h>
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM kvm
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/*
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* Tracepoints for entry/exit to guest
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*/
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TRACE_EVENT(kvm_entry,
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TP_PROTO(unsigned long vcpu_pc),
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TP_ARGS(vcpu_pc),
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TP_STRUCT__entry(
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__field( unsigned long, vcpu_pc )
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),
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TP_fast_assign(
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__entry->vcpu_pc = vcpu_pc;
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),
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TP_printk("PC: 0x%08lx", __entry->vcpu_pc)
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);
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TRACE_EVENT(kvm_exit,
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TP_PROTO(unsigned long vcpu_pc),
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TP_ARGS(vcpu_pc),
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TP_STRUCT__entry(
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__field( unsigned long, vcpu_pc )
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),
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TP_fast_assign(
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__entry->vcpu_pc = vcpu_pc;
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),
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TP_printk("PC: 0x%08lx", __entry->vcpu_pc)
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);
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TRACE_EVENT(kvm_irq_line,
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TP_PROTO(unsigned int type, int vcpu_idx, int irq_num, int level),
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TP_ARGS(type, vcpu_idx, irq_num, level),
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TP_STRUCT__entry(
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__field( unsigned int, type )
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__field( int, vcpu_idx )
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__field( int, irq_num )
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__field( int, level )
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),
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TP_fast_assign(
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__entry->type = type;
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__entry->vcpu_idx = vcpu_idx;
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__entry->irq_num = irq_num;
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__entry->level = level;
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),
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TP_printk("Inject %s interrupt (%d), vcpu->idx: %d, num: %d, level: %d",
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(__entry->type == KVM_ARM_IRQ_TYPE_CPU) ? "CPU" :
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(__entry->type == KVM_ARM_IRQ_TYPE_PPI) ? "VGIC PPI" :
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(__entry->type == KVM_ARM_IRQ_TYPE_SPI) ? "VGIC SPI" : "UNKNOWN",
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__entry->type, __entry->vcpu_idx, __entry->irq_num, __entry->level)
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);
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/* Architecturally implementation defined CP15 register access */
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TRACE_EVENT(kvm_emulate_cp15_imp,
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TP_PROTO(unsigned long Op1, unsigned long Rt1, unsigned long CRn,
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unsigned long CRm, unsigned long Op2, bool is_write),
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TP_ARGS(Op1, Rt1, CRn, CRm, Op2, is_write),
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TP_STRUCT__entry(
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__field( unsigned int, Op1 )
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__field( unsigned int, Rt1 )
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__field( unsigned int, CRn )
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__field( unsigned int, CRm )
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__field( unsigned int, Op2 )
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__field( bool, is_write )
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),
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TP_fast_assign(
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__entry->is_write = is_write;
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__entry->Op1 = Op1;
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__entry->Rt1 = Rt1;
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__entry->CRn = CRn;
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__entry->CRm = CRm;
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__entry->Op2 = Op2;
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),
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TP_printk("Implementation defined CP15: %s\tp15, %u, r%u, c%u, c%u, %u",
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(__entry->is_write) ? "mcr" : "mrc",
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__entry->Op1, __entry->Rt1, __entry->CRn,
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__entry->CRm, __entry->Op2)
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);
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TRACE_EVENT(kvm_wfi,
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TP_PROTO(unsigned long vcpu_pc),
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TP_ARGS(vcpu_pc),
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TP_STRUCT__entry(
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__field( unsigned long, vcpu_pc )
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),
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TP_fast_assign(
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__entry->vcpu_pc = vcpu_pc;
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),
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TP_printk("guest executed wfi at: 0x%08lx", __entry->vcpu_pc)
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);
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TRACE_EVENT(kvm_unmap_hva,
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TP_PROTO(unsigned long hva),
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TP_ARGS(hva),
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TP_STRUCT__entry(
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__field( unsigned long, hva )
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),
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TP_fast_assign(
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__entry->hva = hva;
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),
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TP_printk("mmu notifier unmap hva: %#08lx", __entry->hva)
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);
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TRACE_EVENT(kvm_unmap_hva_range,
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TP_PROTO(unsigned long start, unsigned long end),
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TP_ARGS(start, end),
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TP_STRUCT__entry(
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__field( unsigned long, start )
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__field( unsigned long, end )
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),
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TP_fast_assign(
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__entry->start = start;
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__entry->end = end;
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),
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TP_printk("mmu notifier unmap range: %#08lx -- %#08lx",
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__entry->start, __entry->end)
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);
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TRACE_EVENT(kvm_set_spte_hva,
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TP_PROTO(unsigned long hva),
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TP_ARGS(hva),
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TP_STRUCT__entry(
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__field( unsigned long, hva )
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),
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TP_fast_assign(
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__entry->hva = hva;
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),
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TP_printk("mmu notifier set pte hva: %#08lx", __entry->hva)
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);
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TRACE_EVENT(kvm_hvc,
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TP_PROTO(unsigned long vcpu_pc, unsigned long r0, unsigned long imm),
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TP_ARGS(vcpu_pc, r0, imm),
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TP_STRUCT__entry(
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__field( unsigned long, vcpu_pc )
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__field( unsigned long, r0 )
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__field( unsigned long, imm )
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),
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TP_fast_assign(
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__entry->vcpu_pc = vcpu_pc;
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__entry->r0 = r0;
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__entry->imm = imm;
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),
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TP_printk("HVC at 0x%08lx (r0: 0x%08lx, imm: 0x%lx",
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__entry->vcpu_pc, __entry->r0, __entry->imm)
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);
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#endif /* _TRACE_KVM_H */
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#undef TRACE_INCLUDE_PATH
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#define TRACE_INCLUDE_PATH arch/arm/kvm
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#undef TRACE_INCLUDE_FILE
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#define TRACE_INCLUDE_FILE trace
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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