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Date: Wed, 1 Jul 2015 19:28:54 +0100
From: Alex Bennée <alex.bennee@...aro.org>
To: kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
kvmarm@...ts.cs.columbia.edu, christoffer.dall@...aro.org,
marc.zyngier@....com, peter.maydell@...aro.org, agraf@...e.de,
drjones@...hat.com, pbonzini@...hat.com, zhichao.huang@...aro.org
Cc: jan.kiszka@...mens.com, dahi@...ux.vnet.ibm.com,
r65777@...escale.com, bp@...e.de,
Alex Bennée <alex.bennee@...aro.org>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v7 02/11] 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: Alex Bennée <alex.bennee@...aro.org>
Reviewed-by: David Hildenbrand <dahi@...ux.vnet.ibm.com>
Reviewed-by: Andrew Jones <drjones@...hat.com>
Acked-by: Christoffer Dall <christoffer.dall@...aro.org>
---
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
v6
- mv far comment from later patch
- KVM_GUESTDBG_USE_HW_BP -> KVM_GUESTDBG_USE_HW
- revert control regs to u64 (parity with GET/SET_ONE_REG)
---
arch/arm64/include/uapi/asm/kvm.h | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
index d268320..d82f3f3 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h
@@ -100,12 +100,39 @@ 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).
+ *
+ * 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 {
+ __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; /* 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 {
};
--
2.4.5
--
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