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Commit 21b6f32f authored by Alex Bennée's avatar Alex Bennée Committed by Marc Zyngier
Browse files

KVM: arm64: guest debug, define API headers 



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: default avatarAlex Bennée <alex.bennee@linaro.org>
Reviewed-by: default avatarDavid Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: default avatarAndrew Jones <drjones@redhat.com>
Acked-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent 8ab30c15

arch/arm64/include/uapi/asm/kvm.h

+27 −0
Original line number Original line Diff line number Diff line
@@ -100,12 +100,39 @@ struct kvm_sregs { 
struct kvm_fpu {

struct kvm_fpu {

};

};





/*

 * See v8 ARM ARM D7.3: Debug Registers

 *

 * The architectural limit is 16 debug registers of each type although

 * in practice there are usually less (see ID_AA64DFR0_EL1).

 *

 * Although the control registers are architecturally defined as 32

 * bits wide we use a 64 bit structure here to keep parity with

 * KVM_GET/SET_ONE_REG behaviour which treats all system registers as

 * 64 bit values. It also allows for the possibility of the

 * architecture expanding the control registers without having to

 * change the userspace ABI.

 */

#define KVM_ARM_MAX_DBG_REGS 16

struct kvm_guest_debug_arch {

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 {

struct kvm_debug_exit_arch {

	__u32 hsr;

	__u64 far;	/* used for watchpoints */

};

};





/*

 * Architecture specific defines for kvm_guest_debug->control

 */



#define KVM_GUESTDBG_USE_SW_BP		(1 << 16)

#define KVM_GUESTDBG_USE_HW		(1 << 17)



struct kvm_sync_regs {

struct kvm_sync_regs {

};

};