[PATCH v3 03/12] KVM: arm64: guest debug, define API headers
From: Alex Bennée <hidden>
Date: 2015-05-06 16:25:44
Also in:
kvm, kvmarm, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
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 Benn?e <redacted> Reviewed-by: David Hildenbrand <redacted> Reviewed-by: Andrew Jones <redacted> --- 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