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    Subject[PATCH v3 03/12] KVM: arm64: guest debug, define API headers
    Date
    This commit defines the API headers for guest debugging. There are two
    architecture specific debug structures:

    - kvm_guest_debug_arch, allows us to pass in HW debug registers
    - kvm_debug_exit_arch, signals exception and possible faulting address

    The type of debugging being used is controlled by the architecture
    specific control bits of the kvm_guest_debug->control flags in the ioctl
    structure.

    Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
    Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
    Reviewed-by: Andrew Jones <drjones@redhat.com>

    ---
    v2
    - expose hsr and pc directly to user-space
    v3
    - s/control/controlled/ in commit message
    - add v8 to ARM ARM comment (ARM Architecture Reference Manual)
    - add rb tag
    - rm pc, add far
    - re-word comments on alignment
    - rename KVM_ARM_NDBG_REGS -> KVM_ARM_MAX_DBG_REGS

    diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
    index d268320..04957d7 100644
    --- a/arch/arm64/include/uapi/asm/kvm.h
    +++ b/arch/arm64/include/uapi/asm/kvm.h
    @@ -100,10 +100,28 @@ struct kvm_sregs {
    struct kvm_fpu {
    };

    +/*
    + * See v8 ARM ARM D7.3: Debug Registers
    + *
    + * The control registers are architecturally defined as 32 bits but are
    + * stored as 64 bit values alongside the value registers. This is done
    + * to keep the copying of these values into the vcpu context simple as
    + * everything is 64 bit aligned (see DBGBCR0_EL1 onwards in kvm_asm.h).
    + *
    + * The architectural limit is 16 debug registers of each type although
    + * in practice there are usually less (see ID_AA64DFR0_EL1).
    + */
    +#define KVM_ARM_MAX_DBG_REGS 16
    struct kvm_guest_debug_arch {
    + __u64 dbg_bcr[KVM_ARM_MAX_DBG_REGS];
    + __u64 dbg_bvr[KVM_ARM_MAX_DBG_REGS];
    + __u64 dbg_wcr[KVM_ARM_MAX_DBG_REGS];
    + __u64 dbg_wvr[KVM_ARM_MAX_DBG_REGS];
    };

    struct kvm_debug_exit_arch {
    + __u32 hsr;
    + __u64 far;
    };

    struct kvm_sync_regs {
    @@ -216,4 +234,11 @@ struct kvm_arch_memory_slot {

    #endif

    +/*
    + * Architecture related debug defines - upper 16 bits of
    + * kvm_guest_debug->control
    + */
    +#define KVM_GUESTDBG_USE_SW_BP __KVM_GUESTDBG_USE_SW_BP
    +#define KVM_GUESTDBG_USE_HW_BP __KVM_GUESTDBG_USE_HW_BP
    +
    #endif /* __ARM_KVM_H__ */
    --
    2.3.5


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