On Thu, Jun 04, 2015 at 02:49:17PM +0100, Alex Benn?e wrote:

Christoffer Dall [off-list ref] writes:

quoted

On Fri, May 29, 2015 at 10:30:19AM +0100, Alex Benn?e wrote:

quoted

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>
Acked-by: Christoffer Dall <redacted>

I can re-confirm my ack despite the changes in v4, but this really is
borderline to keep exiting r-b and a-b tags around from previous patches
I would think, but ok.

I was wondering how much a patch has to change for the r-b tags to
become invalid. The meat of the API hasn't changed much though.

Drew/David,

Are you still happy with this patch?

I'm fine with it. Sorry I haven't had time to look over the rest of the
series yet this round.

drew

quoted

-Christoffer

quoted

---
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
v4
   - now uses common HW/SW BP define
   - add a-b-tag
   - use u32 for control regs
v5
   - revert to have arch specific KVM_GUESTDBG_USE_SW/HW_BP
   - rm stale comments dbgctrl was stored as u64
---
 arch/arm64/include/uapi/asm/kvm.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
index d268320..43758e7 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h

@@ -100,12 +100,32 @@ struct kvm_sregs {
 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).
+ */
+#define KVM_ARM_MAX_DBG_REGS 16
 struct kvm_guest_debug_arch {
+	__u32 dbg_bcr[KVM_ARM_MAX_DBG_REGS];
+	__u64 dbg_bvr[KVM_ARM_MAX_DBG_REGS];
+	__u32 dbg_wcr[KVM_ARM_MAX_DBG_REGS];
+	__u64 dbg_wvr[KVM_ARM_MAX_DBG_REGS];
 };
 
 struct kvm_debug_exit_arch {
+	__u32 hsr;
+	__u64 far;
 };
 
+/*
+ * Architecture specific defines for kvm_guest_debug->control
+ */
+
+#define KVM_GUESTDBG_USE_SW_BP		(1 << 16)
+#define KVM_GUESTDBG_USE_HW_BP		(1 << 17)
+
 struct kvm_sync_regs {
 };
 

-- 
2.4.1

-- 
Alex Benn?e
--
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