| /openbmc/linux/arch/powerpc/kvm/ |
| H A D | booke.h | diff ce11e48b7fdd256ec68b932a89b397a790566031 Thu Jul 04 01:57:47 CDT 2013 Bharat Bhushan <r65777@freescale.com> KVM: PPC: E500: Add userspace debug stub support
This patch adds the debug stub support on booke/bookehv.
Now QEMU debug stub can use hw breakpoint, watchpoint and
software breakpoint to debug guest.
This is how we save/restore debug register context when switching
between guest, userspace and kernel user-process:
When QEMU is running
-> thread->debug_reg == QEMU debug register context.
-> Kernel will handle switching the debug register on context switch.
-> no vcpu_load() called
QEMU makes ioctls (except RUN)
-> This will call vcpu_load()
-> should not change context.
-> Some ioctls can change vcpu debug register, context saved in vcpu->debug_regs
QEMU Makes RUN ioctl
-> Save thread->debug_reg on STACK
-> Store thread->debug_reg == vcpu->debug_reg
-> load thread->debug_reg
-> RUN VCPU ( So thread points to vcpu context )
Context switch happens When VCPU running
-> makes vcpu_load() should not load any context
-> kernel loads the vcpu context as thread->debug_regs points to vcpu context.
On heavyweight_exit
-> Load the context saved on stack in thread->debug_reg
Currently we do not support debug resource emulation to guest,
On debug exception, always exit to user space irrespective of
user space is expecting the debug exception or not. If this is
unexpected exception (breakpoint/watchpoint event not set by
userspace) then let us leave the action on user space. This
is similar to what it was before, only thing is that now we
have proper exit state available to user space.
Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
|
| H A D | booke.c | diff f5f972102d5c12729f0a35fce266b580aaa03f66 Fri Nov 22 15:52:29 CST 2013 Scott Wood <scottwood@freescale.com> powerpc/kvm/booke: Fix build break due to stack frame size warning
Commit ce11e48b7fdd256ec68b932a89b397a790566031 ("KVM: PPC: E500: Add
userspace debug stub support") added "struct thread_struct" to the
stack of kvmppc_vcpu_run(). thread_struct is 1152 bytes on my build,
compared to 48 bytes for the recently-introduced "struct debug_reg".
Use the latter instead.
This fixes the following error:
cc1: warnings being treated as errors
arch/powerpc/kvm/booke.c: In function 'kvmppc_vcpu_run':
arch/powerpc/kvm/booke.c:760:1: error: the frame size of 1424 bytes is larger than 1024 bytes
make[2]: *** [arch/powerpc/kvm/booke.o] Error 1
make[1]: *** [arch/powerpc/kvm] Error 2
make[1]: *** Waiting for unfinished jobs....
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff ce11e48b7fdd256ec68b932a89b397a790566031 Thu Jul 04 01:57:47 CDT 2013 Bharat Bhushan <r65777@freescale.com> KVM: PPC: E500: Add userspace debug stub support
This patch adds the debug stub support on booke/bookehv.
Now QEMU debug stub can use hw breakpoint, watchpoint and
software breakpoint to debug guest.
This is how we save/restore debug register context when switching
between guest, userspace and kernel user-process:
When QEMU is running
-> thread->debug_reg == QEMU debug register context.
-> Kernel will handle switching the debug register on context switch.
-> no vcpu_load() called
QEMU makes ioctls (except RUN)
-> This will call vcpu_load()
-> should not change context.
-> Some ioctls can change vcpu debug register, context saved in vcpu->debug_regs
QEMU Makes RUN ioctl
-> Save thread->debug_reg on STACK
-> Store thread->debug_reg == vcpu->debug_reg
-> load thread->debug_reg
-> RUN VCPU ( So thread points to vcpu context )
Context switch happens When VCPU running
-> makes vcpu_load() should not load any context
-> kernel loads the vcpu context as thread->debug_regs points to vcpu context.
On heavyweight_exit
-> Load the context saved on stack in thread->debug_reg
Currently we do not support debug resource emulation to guest,
On debug exception, always exit to user space irrespective of
user space is expecting the debug exception or not. If this is
unexpected exception (breakpoint/watchpoint event not set by
userspace) then let us leave the action on user space. This
is similar to what it was before, only thing is that now we
have proper exit state available to user space.
Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
|
| /openbmc/linux/arch/powerpc/include/uapi/asm/ |
| H A D | kvm.h | diff ce11e48b7fdd256ec68b932a89b397a790566031 Thu Jul 04 01:57:47 CDT 2013 Bharat Bhushan <r65777@freescale.com> KVM: PPC: E500: Add userspace debug stub support
This patch adds the debug stub support on booke/bookehv.
Now QEMU debug stub can use hw breakpoint, watchpoint and
software breakpoint to debug guest.
This is how we save/restore debug register context when switching
between guest, userspace and kernel user-process:
When QEMU is running
-> thread->debug_reg == QEMU debug register context.
-> Kernel will handle switching the debug register on context switch.
-> no vcpu_load() called
QEMU makes ioctls (except RUN)
-> This will call vcpu_load()
-> should not change context.
-> Some ioctls can change vcpu debug register, context saved in vcpu->debug_regs
QEMU Makes RUN ioctl
-> Save thread->debug_reg on STACK
-> Store thread->debug_reg == vcpu->debug_reg
-> load thread->debug_reg
-> RUN VCPU ( So thread points to vcpu context )
Context switch happens When VCPU running
-> makes vcpu_load() should not load any context
-> kernel loads the vcpu context as thread->debug_regs points to vcpu context.
On heavyweight_exit
-> Load the context saved on stack in thread->debug_reg
Currently we do not support debug resource emulation to guest,
On debug exception, always exit to user space irrespective of
user space is expecting the debug exception or not. If this is
unexpected exception (breakpoint/watchpoint event not set by
userspace) then let us leave the action on user space. This
is similar to what it was before, only thing is that now we
have proper exit state available to user space.
Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
|
| /openbmc/linux/arch/powerpc/include/asm/ |
| H A D | switch_to.h | diff f5f972102d5c12729f0a35fce266b580aaa03f66 Fri Nov 22 15:52:29 CST 2013 Scott Wood <scottwood@freescale.com> powerpc/kvm/booke: Fix build break due to stack frame size warning
Commit ce11e48b7fdd256ec68b932a89b397a790566031 ("KVM: PPC: E500: Add
userspace debug stub support") added "struct thread_struct" to the
stack of kvmppc_vcpu_run(). thread_struct is 1152 bytes on my build,
compared to 48 bytes for the recently-introduced "struct debug_reg".
Use the latter instead.
This fixes the following error:
cc1: warnings being treated as errors
arch/powerpc/kvm/booke.c: In function 'kvmppc_vcpu_run':
arch/powerpc/kvm/booke.c:760:1: error: the frame size of 1424 bytes is larger than 1024 bytes
make[2]: *** [arch/powerpc/kvm/booke.o] Error 1
make[1]: *** [arch/powerpc/kvm] Error 2
make[1]: *** Waiting for unfinished jobs....
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
|
| H A D | kvm_host.h | diff ce11e48b7fdd256ec68b932a89b397a790566031 Thu Jul 04 01:57:47 CDT 2013 Bharat Bhushan <r65777@freescale.com> KVM: PPC: E500: Add userspace debug stub support
This patch adds the debug stub support on booke/bookehv.
Now QEMU debug stub can use hw breakpoint, watchpoint and
software breakpoint to debug guest.
This is how we save/restore debug register context when switching
between guest, userspace and kernel user-process:
When QEMU is running
-> thread->debug_reg == QEMU debug register context.
-> Kernel will handle switching the debug register on context switch.
-> no vcpu_load() called
QEMU makes ioctls (except RUN)
-> This will call vcpu_load()
-> should not change context.
-> Some ioctls can change vcpu debug register, context saved in vcpu->debug_regs
QEMU Makes RUN ioctl
-> Save thread->debug_reg on STACK
-> Store thread->debug_reg == vcpu->debug_reg
-> load thread->debug_reg
-> RUN VCPU ( So thread points to vcpu context )
Context switch happens When VCPU running
-> makes vcpu_load() should not load any context
-> kernel loads the vcpu context as thread->debug_regs points to vcpu context.
On heavyweight_exit
-> Load the context saved on stack in thread->debug_reg
Currently we do not support debug resource emulation to guest,
On debug exception, always exit to user space irrespective of
user space is expecting the debug exception or not. If this is
unexpected exception (breakpoint/watchpoint event not set by
userspace) then let us leave the action on user space. This
is similar to what it was before, only thing is that now we
have proper exit state available to user space.
Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
|
| /openbmc/linux/arch/powerpc/kernel/ |
| H A D | process.c | diff f5f972102d5c12729f0a35fce266b580aaa03f66 Fri Nov 22 15:52:29 CST 2013 Scott Wood <scottwood@freescale.com> powerpc/kvm/booke: Fix build break due to stack frame size warning
Commit ce11e48b7fdd256ec68b932a89b397a790566031 ("KVM: PPC: E500: Add
userspace debug stub support") added "struct thread_struct" to the
stack of kvmppc_vcpu_run(). thread_struct is 1152 bytes on my build,
compared to 48 bytes for the recently-introduced "struct debug_reg".
Use the latter instead.
This fixes the following error:
cc1: warnings being treated as errors
arch/powerpc/kvm/booke.c: In function 'kvmppc_vcpu_run':
arch/powerpc/kvm/booke.c:760:1: error: the frame size of 1424 bytes is larger than 1024 bytes
make[2]: *** [arch/powerpc/kvm/booke.o] Error 1
make[1]: *** [arch/powerpc/kvm] Error 2
make[1]: *** Waiting for unfinished jobs....
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
|