Commit 1a9167a2 authored by Fabiano Rosas's avatar Fabiano Rosas Committed by Paul Mackerras
Browse files

KVM: PPC: Report single stepping capability 



When calling the KVM_SET_GUEST_DEBUG ioctl, userspace might request
the next instruction to be single stepped via the
KVM_GUESTDBG_SINGLESTEP control bit of the kvm_guest_debug structure.

This patch adds the KVM_CAP_PPC_GUEST_DEBUG_SSTEP capability in order
to inform userspace about the state of single stepping support.

We currently don't have support for guest single stepping implemented
in Book3S HV so the capability is only present for Book3S PR and
BookE.

Signed-off-by: default avatarFabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
parent 12ade69c

Documentation/virt/kvm/api.txt

+3 −0
Original line number Diff line number Diff line
@@ -2982,6 +2982,9 @@ can be determined by querying the KVM_CAP_GUEST_DEBUG_HW_BPS and 
KVM_CAP_GUEST_DEBUG_HW_WPS capabilities which return a positive number

indicating the number of supported registers.



For ppc, the KVM_CAP_PPC_GUEST_DEBUG_SSTEP capability indicates whether

the single-step debug event (KVM_GUESTDBG_SINGLESTEP) is supported.



When debug events exit the main run loop with the reason

KVM_EXIT_DEBUG with the kvm_debug_exit_arch part of the kvm_run

structure containing architecture specific debug information.

arch/powerpc/kvm/powerpc.c

+2 −0
Original line number Diff line number Diff line
@@ -522,6 +522,8 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 
	case KVM_CAP_IMMEDIATE_EXIT:

		r = 1;

		break;

	case KVM_CAP_PPC_GUEST_DEBUG_SSTEP:

		/* fall through */

	case KVM_CAP_PPC_PAIRED_SINGLES:

	case KVM_CAP_PPC_OSI:

	case KVM_CAP_PPC_GET_PVINFO:

include/uapi/linux/kvm.h

+1 −0
Original line number Diff line number Diff line
@@ -1000,6 +1000,7 @@ struct kvm_ppc_resize_hpt { 
#define KVM_CAP_PMU_EVENT_FILTER 173

#define KVM_CAP_ARM_IRQ_LINE_LAYOUT_2 174

#define KVM_CAP_HYPERV_DIRECT_TLBFLUSH 175

#define KVM_CAP_PPC_GUEST_DEBUG_SSTEP 176



#ifdef KVM_CAP_IRQ_ROUTING

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