Hi,
Here is V4 of the KVM Guest Debug support for arm64.
The changes are all due to Christoffer's review of v3 and sees a few
tweaks. The main change to the debug register code means we no longer
overlay the registers in sys_reg[] context but have specific areas for
the vcpu_debug_state and external_debug_state. As a result the need to
__u64 align the registers has been removed and we now have:
#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];
};
There are additional comments to clarify how we handle trapping and
preserving registers.
For full details see the changelog on each of the patches.
GIT Repos:
The patches for this series are based off v4.1-rc3 and can be found
at:
https://git.linaro.org/people/alex.bennee/linux.git
branch: guest-debug/4.1-rc3-v4
I'm still in the process of going through the QEMU comments and adding
the re-injection support. However the current working state can be
seen at:
https://github.com/stsquad/qemu
branch: kvm/guest-debug-v4
Alex Bennée (12):
KVM: add comments for kvm_debug_exit_arch struct
KVM: define common KVM_GUESTDBG_USE_SW/HW_BP bits
KVM: arm64: guest debug, define API headers
KVM: arm: guest debug, add stub KVM_SET_GUEST_DEBUG ioctl
KVM: arm: introduce kvm_arm_init/setup/clear_debug
KVM: arm64: guest debug, add SW break point support
KVM: arm64: guest debug, add support for single-step
KVM: arm64: re-factor hyp.S debug register code
KVM: arm64: introduce vcpu->arch.debug_ptr
KVM: arm64: guest debug, HW assisted debug support
KVM: arm64: enable KVM_CAP_SET_GUEST_DEBUG
KVM: arm64: add trace points for guest_debug debug
Documentation/virtual/kvm/api.txt | 15 +-
arch/arm/include/asm/kvm_host.h | 4 +
arch/arm/kvm/arm.c | 46 ++-
arch/arm/kvm/trace.h | 17 +
arch/arm64/include/asm/hw_breakpoint.h | 12 +
arch/arm64/include/asm/kvm_asm.h | 26 +-
arch/arm64/include/asm/kvm_host.h | 30 +-
arch/arm64/include/uapi/asm/kvm.h | 18 ++
arch/arm64/kernel/asm-offsets.c | 7 +
arch/arm64/kernel/hw_breakpoint.c | 12 -
arch/arm64/kvm/Makefile | 2 +-
arch/arm64/kvm/debug.c | 203 ++++++++++++
arch/arm64/kvm/handle_exit.c | 44 +++
arch/arm64/kvm/hyp.S | 545 ++++++++++-----------------------
arch/arm64/kvm/reset.c | 15 +
arch/arm64/kvm/sys_regs.c | 136 ++++++--
arch/arm64/kvm/trace.h | 105 +++++++
arch/powerpc/include/uapi/asm/kvm.h | 4 +-
arch/s390/include/uapi/asm/kvm.h | 2 -
arch/x86/include/uapi/asm/kvm.h | 2 -
include/uapi/linux/kvm.h | 11 +-
21 files changed, 798 insertions(+), 458 deletions(-)
create mode 100644 arch/arm64/kvm/debug.c
--
2.3.5
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