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Subject: Re: [PATCH v2] xen: move pv irq related functions under CONFIG_XEN_PV
 umbrella
To:     Juergen Gross <jgross@suse.com>, linux-kernel@vger.kernel.org,
        xen-devel@lists.xenproject.org, x86@kernel.org, hpa@zytor.com,
        tglx@linutronix.de, mingo@redhat.com
References: <20180808061918.5033-1-jgross@suse.com>
From:   Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Message-ID: <b7909bb0-ed7c-2640-3f50-136c9e8abf3d@oracle.com>
Date:   Wed, 8 Aug 2018 11:13:02 -0400
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x86 maintainers, this needs you ack too even though it has "xen" tag in
the subject, thanks.


On 08/08/2018 02:19 AM, Juergen Gross wrote:
> All functions in arch/x86/xen/irq.c and arch/x86/xen/xen-asm*.S are
> specific to PV guests. Include them in the kernel with
> CONFIG_XEN_PV only.
>
> Make the PV specific code in arch/x86/entry/entry_*.S dependent on
> CONFIG_XEN_PV instead of CONFIG_XEN.
>
> The HVM specific code should depend on CONFIG_XEN_PVHVM.
>
> While at it reformat the Makefile to make it more readable.
>
> Signed-off-by: Juergen Gross <jgross@suse.com>


Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>


> ---
>  arch/x86/entry/entry_32.S |  8 +++++---
>  arch/x86/entry/entry_64.S |  8 +++++---
>  arch/x86/xen/Makefile     | 41 +++++++++++++++++++++++++++++++----------
>  include/xen/events.h      |  2 ++
>  4 files changed, 43 insertions(+), 16 deletions(-)
>
> diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
> index c371bfee137a..cc4ec4fd58d2 100644
> --- a/arch/x86/entry/entry_32.S
> +++ b/arch/x86/entry/entry_32.S
> @@ -369,7 +369,7 @@ GLOBAL(__begin_SYSENTER_singlestep_region)
>   * will ignore all of the single-step traps generated in this range.
>   */
>  
> -#ifdef CONFIG_XEN
> +#ifdef CONFIG_XEN_PV
>  /*
>   * Xen doesn't set %esp to be precisely what the normal SYSENTER
>   * entry point expects, so fix it up before using the normal path.
> @@ -807,7 +807,7 @@ ENTRY(spurious_interrupt_bug)
>  	jmp	common_exception
>  END(spurious_interrupt_bug)
>  
> -#ifdef CONFIG_XEN
> +#ifdef CONFIG_XEN_PV
>  ENTRY(xen_hypervisor_callback)
>  	pushl	$-1				/* orig_ax = -1 => not a system call */
>  	SAVE_ALL
> @@ -888,11 +888,13 @@ ENTRY(xen_failsafe_callback)
>  	_ASM_EXTABLE(3b, 8b)
>  	_ASM_EXTABLE(4b, 9b)
>  ENDPROC(xen_failsafe_callback)
> +#endif /* CONFIG_XEN_PV */
>  
> +#ifdef CONFIG_XEN_PVHVM
>  BUILD_INTERRUPT3(xen_hvm_callback_vector, HYPERVISOR_CALLBACK_VECTOR,
>  		 xen_evtchn_do_upcall)
> +#endif
>  
> -#endif /* CONFIG_XEN */
>  
>  #if IS_ENABLED(CONFIG_HYPERV)
>  
> diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
> index 8ae7ffda8f98..3c2526e24dd8 100644
> --- a/arch/x86/entry/entry_64.S
> +++ b/arch/x86/entry/entry_64.S
> @@ -1049,7 +1049,7 @@ ENTRY(do_softirq_own_stack)
>  	ret
>  ENDPROC(do_softirq_own_stack)
>  
> -#ifdef CONFIG_XEN
> +#ifdef CONFIG_XEN_PV
>  idtentry hypervisor_callback xen_do_hypervisor_callback has_error_code=0
>  
>  /*
> @@ -1129,11 +1129,13 @@ ENTRY(xen_failsafe_callback)
>  	ENCODE_FRAME_POINTER
>  	jmp	error_exit
>  END(xen_failsafe_callback)
> +#endif /* CONFIG_XEN_PV */
>  
> +#ifdef CONFIG_XEN_PVHVM
>  apicinterrupt3 HYPERVISOR_CALLBACK_VECTOR \
>  	xen_hvm_callback_vector xen_evtchn_do_upcall
> +#endif
>  
> -#endif /* CONFIG_XEN */
>  
>  #if IS_ENABLED(CONFIG_HYPERV)
>  apicinterrupt3 HYPERVISOR_CALLBACK_VECTOR \
> @@ -1150,7 +1152,7 @@ idtentry debug			do_debug		has_error_code=0	paranoid=1 shift_ist=DEBUG_STACK
>  idtentry int3			do_int3			has_error_code=0
>  idtentry stack_segment		do_stack_segment	has_error_code=1
>  
> -#ifdef CONFIG_XEN
> +#ifdef CONFIG_XEN_PV
>  idtentry xennmi			do_nmi			has_error_code=0
>  idtentry xendebug		do_debug		has_error_code=0
>  idtentry xenint3		do_int3			has_error_code=0
> diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
> index d83cb5478f54..f723b5aa8f74 100644
> --- a/arch/x86/xen/Makefile
> +++ b/arch/x86/xen/Makefile
> @@ -12,25 +12,46 @@ endif
>  # Make sure early boot has no stackprotector
>  nostackp := $(call cc-option, -fno-stack-protector)
>  CFLAGS_enlighten_pv.o		:= $(nostackp)
> -CFLAGS_mmu_pv.o		:= $(nostackp)
> +CFLAGS_mmu_pv.o			:= $(nostackp)
>  
> -obj-y		:= enlighten.o multicalls.o mmu.o irq.o \
> -			time.o xen-asm.o xen-asm_$(BITS).o \
> -			grant-table.o suspend.o platform-pci-unplug.o
> +obj-y				+= enlighten.o
> +obj-y				+= multicalls.o
> +obj-y				+= mmu.o
> +obj-y				+= time.o
> +obj-y				+= grant-table.o
> +obj-y				+= suspend.o
> +obj-y				+= platform-pci-unplug.o
>  
> -obj-$(CONFIG_XEN_PVHVM)		+= enlighten_hvm.o mmu_hvm.o suspend_hvm.o
> -obj-$(CONFIG_XEN_PV)			+= setup.o apic.o pmu.o suspend_pv.o \
> -						p2m.o enlighten_pv.o mmu_pv.o
> -obj-$(CONFIG_XEN_PVH)			+= enlighten_pvh.o
> +obj-$(CONFIG_XEN_PVHVM)		+= enlighten_hvm.o
> +obj-$(CONFIG_XEN_PVHVM)		+= mmu_hvm.o
> +obj-$(CONFIG_XEN_PVHVM)		+= suspend_hvm.o
>  
> -obj-$(CONFIG_EVENT_TRACING) += trace.o
> +obj-$(CONFIG_XEN_PV)		+= setup.o
> +obj-$(CONFIG_XEN_PV)		+= apic.o
> +obj-$(CONFIG_XEN_PV)		+= pmu.o
> +obj-$(CONFIG_XEN_PV)		+= suspend_pv.o
> +obj-$(CONFIG_XEN_PV)		+= p2m.o
> +obj-$(CONFIG_XEN_PV)		+= enlighten_pv.o
> +obj-$(CONFIG_XEN_PV)		+= mmu_pv.o
> +obj-$(CONFIG_XEN_PV)		+= irq.o
> +obj-$(CONFIG_XEN_PV)		+= xen-asm.o
> +obj-$(CONFIG_XEN_PV)		+= xen-asm_$(BITS).o
> +
> +obj-$(CONFIG_XEN_PVH)		+= enlighten_pvh.o
> +obj-$(CONFIG_XEN_PVH)	 	+= xen-pvh.o
> +
> +obj-$(CONFIG_EVENT_TRACING)	+= trace.o
>  
>  obj-$(CONFIG_SMP)		+= smp.o
>  obj-$(CONFIG_XEN_PV_SMP)  	+= smp_pv.o
>  obj-$(CONFIG_XEN_PVHVM_SMP)  	+= smp_hvm.o
> +
>  obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o
> +
>  obj-$(CONFIG_XEN_DEBUG_FS)	+= debugfs.o
> +
>  obj-$(CONFIG_XEN_DOM0)		+= vga.o
> +
>  obj-$(CONFIG_SWIOTLB_XEN)	+= pci-swiotlb-xen.o
> +
>  obj-$(CONFIG_XEN_EFI)		+= efi.o
> -obj-$(CONFIG_XEN_PVH)	 	+= xen-pvh.o
> diff --git a/include/xen/events.h b/include/xen/events.h
> index c3e6bc643a7b..a48897199975 100644
> --- a/include/xen/events.h
> +++ b/include/xen/events.h
> @@ -89,11 +89,13 @@ unsigned irq_from_evtchn(unsigned int evtchn);
>  int irq_from_virq(unsigned int cpu, unsigned int virq);
>  unsigned int evtchn_from_irq(unsigned irq);
>  
> +#ifdef CONFIG_XEN_PVHVM
>  /* Xen HVM evtchn vector callback */
>  void xen_hvm_callback_vector(void);
>  #ifdef CONFIG_TRACING
>  #define trace_xen_hvm_callback_vector xen_hvm_callback_vector
>  #endif
> +#endif
>  int xen_set_callback_via(uint64_t via);
>  void xen_evtchn_do_upcall(struct pt_regs *regs);
>  void xen_hvm_evtchn_do_upcall(void);