[PATCH 0/7] KVM: Add Makefile.kvm for common files

[PATCH 0/7] KVM: Add Makefile.kvm for common files

[David Woodhouse]

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On Mon, 2021-11-15 at 20:26 +0100, Paolo Bonzini wrote:
> > > Also, for the small requests: since you are at it, can you add the code
> > > in a new file under virt/kvm/?
> >
> > Hm... only if I can make hva_to_pfn() and probably a handful of other
> > things non-static?
> 
> Yes, I think sooner or later we also want all pfn stuff in one file 
> (together with MMU notifiers) and all hva stuff in another; so for now 
> you can create virt/kvm/hva_to_pfn.h, or virt/kvm/mm.h, or whatever 
> color of the bikeshed you prefer.


OK... let's start with this.

David Woodhouse (7):
      KVM: Introduce CONFIG_HAVE_KVM_DIRTY_RING
      KVM: Add Makefile.kvm for common files, use it for x86
      KVM: s390: Use Makefile.kvm for common files
      KVM: mips: Use Makefile.kvm for common files
      KVM: RISC-V: Use Makefile.kvm for common files
      KVM: powerpc: Use Makefile.kvm for common files
      KVM: arm64: Use Makefile.kvm for common files

 arch/arm64/kvm/Makefile        |  6 ++----
 arch/mips/kvm/Makefile         |  3 ++-
 arch/powerpc/kvm/Makefile      |  6 +-----
 arch/riscv/kvm/Makefile        |  6 +-----
 arch/s390/kvm/Makefile         |  6 ++----
 arch/x86/kvm/Kconfig           |  1 +
 arch/x86/kvm/Makefile          |  7 +------
 include/linux/kvm_dirty_ring.h |  8 ++++----
 virt/kvm/Kconfig               |  3 +++
 virt/kvm/Makefile.kvm          | 13 +++++++++++++
 virt/kvm/kvm_main.c            |  4 ++--
 11 files changed, 32 insertions(+), 31 deletions(-)

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[PATCH 1/7] KVM: Introduce CONFIG_HAVE_KVM_DIRTY_RING

[David Woodhouse]

From: David Woodhouse <dwmw@amazon.co.uk>

I'd like to make the build include dirty_ring.c based on whether the
arch wants it or not. That's a whole lot simpler if there's a config
symbol instead of doing it implicitly on KVM_DIRTY_LOG_PAGE_OFFSET
being set to something non-zero.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
 arch/x86/kvm/Kconfig           | 1 +
 include/linux/kvm_dirty_ring.h | 8 ++++----
 virt/kvm/Kconfig               | 3 +++
 virt/kvm/kvm_main.c            | 4 ++--
 4 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 619186138176..d7fa0a42ac25 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -27,6 +27,7 @@ config KVM
 	select MMU_NOTIFIER
 	select HAVE_KVM_IRQCHIP
 	select HAVE_KVM_IRQFD
+	select HAVE_KVM_DIRTY_RING
 	select IRQ_BYPASS_MANAGER
 	select HAVE_KVM_IRQ_BYPASS
 	select HAVE_KVM_IRQ_ROUTING
diff --git a/include/linux/kvm_dirty_ring.h b/include/linux/kvm_dirty_ring.h
index 120e5e90fa1d..4da8d4a4140b 100644
--- a/include/linux/kvm_dirty_ring.h
+++ b/include/linux/kvm_dirty_ring.h
@@ -27,9 +27,9 @@ struct kvm_dirty_ring {
 	int index;
 };
 
-#if (KVM_DIRTY_LOG_PAGE_OFFSET == 0)
+#ifndef CONFIG_HAVE_KVM_DIRTY_RING
 /*
- * If KVM_DIRTY_LOG_PAGE_OFFSET not defined, kvm_dirty_ring.o should
+ * If CONFIG_HAVE_HVM_DIRTY_RING not defined, kvm_dirty_ring.o should
  * not be included as well, so define these nop functions for the arch.
  */
 static inline u32 kvm_dirty_ring_get_rsvd_entries(void)
@@ -74,7 +74,7 @@ static inline bool kvm_dirty_ring_soft_full(struct kvm_dirty_ring *ring)
 	return true;
 }
 
-#else /* KVM_DIRTY_LOG_PAGE_OFFSET == 0 */
+#else /* CONFIG_HAVE_KVM_DIRTY_RING */
 
 u32 kvm_dirty_ring_get_rsvd_entries(void);
 int kvm_dirty_ring_alloc(struct kvm_dirty_ring *ring, int index, u32 size);
@@ -98,6 +98,6 @@ struct page *kvm_dirty_ring_get_page(struct kvm_dirty_ring *ring, u32 offset);
 void kvm_dirty_ring_free(struct kvm_dirty_ring *ring);
 bool kvm_dirty_ring_soft_full(struct kvm_dirty_ring *ring);
 
-#endif /* KVM_DIRTY_LOG_PAGE_OFFSET == 0 */
+#endif /* CONFIG_HAVE_KVM_DIRTY_RING */
 
 #endif	/* KVM_DIRTY_RING_H */
diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index 62b39149b8c8..97cf5413ac25 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -13,6 +13,9 @@ config HAVE_KVM_IRQFD
 config HAVE_KVM_IRQ_ROUTING
        bool
 
+config HAVE_KVM_DIRTY_RING
+       bool
+
 config HAVE_KVM_EVENTFD
        bool
        select EVENTFD
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 9646bb9112c1..356d636e037d 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3411,7 +3411,7 @@ EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
 
 static bool kvm_page_in_dirty_ring(struct kvm *kvm, unsigned long pgoff)
 {
-#if KVM_DIRTY_LOG_PAGE_OFFSET > 0
+#ifdef CONFIG_HAVE_KVM_DIRTY_RING
 	return (pgoff >= KVM_DIRTY_LOG_PAGE_OFFSET) &&
 	    (pgoff < KVM_DIRTY_LOG_PAGE_OFFSET +
 	     kvm->dirty_ring_size / PAGE_SIZE);
@@ -4114,7 +4114,7 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
 	case KVM_CAP_NR_MEMSLOTS:
 		return KVM_USER_MEM_SLOTS;
 	case KVM_CAP_DIRTY_LOG_RING:
-#if KVM_DIRTY_LOG_PAGE_OFFSET > 0
+#ifdef KVM_HAVE_KVM_DIRTY_RING
 		return KVM_DIRTY_RING_MAX_ENTRIES * sizeof(struct kvm_dirty_gfn);
 #else
 		return 0;
-- 
2.31.1

[PATCH 2/7] KVM: Add Makefile.kvm for common files, use it for x86

[David Woodhouse]

From: David Woodhouse <dwmw@amazon.co.uk>

Splitting kvm_main.c out into smaller and better-organized files is
slightly non-trivial when it involves editing a bunch of per-arch
KVM makefiles. Provide virt/kvm/Makefile.kvm for them to include.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
 arch/x86/kvm/Makefile |  7 +------
 virt/kvm/Makefile.kvm | 13 +++++++++++++
 2 files changed, 14 insertions(+), 6 deletions(-)
 create mode 100644 virt/kvm/Makefile.kvm

diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index 75dfd27b6e8a..30f244b64523 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -7,12 +7,7 @@ ifeq ($(CONFIG_FRAME_POINTER),y)
 OBJECT_FILES_NON_STANDARD_vmenter.o := y
 endif
 
-KVM := ../../../virt/kvm
-
-kvm-y			+= $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o \
-				$(KVM)/eventfd.o $(KVM)/irqchip.o $(KVM)/vfio.o \
-				$(KVM)/dirty_ring.o $(KVM)/binary_stats.o
-kvm-$(CONFIG_KVM_ASYNC_PF)	+= $(KVM)/async_pf.o
+include $(srctree)/virt/kvm/Makefile.kvm
 
 kvm-y			+= x86.o emulate.o i8259.o irq.o lapic.o \
 			   i8254.o ioapic.o irq_comm.o cpuid.o pmu.o mtrr.o \
diff --git a/virt/kvm/Makefile.kvm b/virt/kvm/Makefile.kvm
new file mode 100644
index 000000000000..ee9c310f3601
--- /dev/null
+++ b/virt/kvm/Makefile.kvm
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for Kernel-based Virtual Machine module
+#
+
+KVM ?= ../../../virt/kvm
+
+kvm-y := $(KVM)/kvm_main.o $(KVM)/eventfd.o $(KVM)/binary_stats.o
+kvm-$(CONFIG_KVM_VFIO) += $(KVM)/vfio.o
+kvm-$(CONFIG_KVM_MMIO) += $(KVM)/coalesced_mmio.o
+kvm-$(CONFIG_KVM_ASYNC_PF) += $(KVM)/async_pf.o
+kvm-$(CONFIG_HAVE_KVM_IRQCHIP) += $(KVM)/irqchip.o
+kvm-$(CONFIG_HAVE_KVM_DIRTY_RING) += $(KVM)/dirty_ring.o
-- 
2.31.1

[PATCH 3/7] KVM: s390: Use Makefile.kvm for common files

[David Woodhouse]

From: David Woodhouse <dwmw@amazon.co.uk>

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
 arch/s390/kvm/Makefile | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/s390/kvm/Makefile b/arch/s390/kvm/Makefile
index b3aaadc60ead..e4f50453cf7f 100644
--- a/arch/s390/kvm/Makefile
+++ b/arch/s390/kvm/Makefile
@@ -3,13 +3,11 @@
 #
 # Copyright IBM Corp. 2008
 
-KVM := ../../../virt/kvm
-common-objs = $(KVM)/kvm_main.o $(KVM)/eventfd.o  $(KVM)/async_pf.o \
-	      $(KVM)/irqchip.o $(KVM)/vfio.o $(KVM)/binary_stats.o
+include $(srctree)/virt/kvm/Makefile.kvm
 
 ccflags-y := -Ivirt/kvm -Iarch/s390/kvm
 
-kvm-objs := $(common-objs) kvm-s390.o intercept.o interrupt.o priv.o sigp.o
+kvm-objs := kvm-s390.o intercept.o interrupt.o priv.o sigp.o
 kvm-objs += diag.o gaccess.o guestdbg.o vsie.o pv.o
 
 obj-$(CONFIG_KVM) += kvm.o
-- 
2.31.1

Re: [PATCH 3/7] KVM: s390: Use Makefile.kvm for common files

[Christian Borntraeger]

Am 16.11.21 um 12:50 schrieb David Woodhouse:
> From: David Woodhouse <dwmw@amazon.co.uk>
> 
> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>

Looks good.
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>

> ---
>   arch/s390/kvm/Makefile | 6 ++----
>   1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/s390/kvm/Makefile b/arch/s390/kvm/Makefile
> index b3aaadc60ead..e4f50453cf7f 100644
> --- a/arch/s390/kvm/Makefile
> +++ b/arch/s390/kvm/Makefile
> @@ -3,13 +3,11 @@
>   #
>   # Copyright IBM Corp. 2008
>   
> -KVM := ../../../virt/kvm
> -common-objs = $(KVM)/kvm_main.o $(KVM)/eventfd.o  $(KVM)/async_pf.o \
> -	      $(KVM)/irqchip.o $(KVM)/vfio.o $(KVM)/binary_stats.o
> +include $(srctree)/virt/kvm/Makefile.kvm
>   
>   ccflags-y := -Ivirt/kvm -Iarch/s390/kvm
>   
> -kvm-objs := $(common-objs) kvm-s390.o intercept.o interrupt.o priv.o sigp.o
> +kvm-objs := kvm-s390.o intercept.o interrupt.o priv.o sigp.o
>   kvm-objs += diag.o gaccess.o guestdbg.o vsie.o pv.o
>   
>   obj-$(CONFIG_KVM) += kvm.o
> 

[PATCH 4/7] KVM: mips: Use Makefile.kvm for common files

[David Woodhouse]

From: David Woodhouse <dwmw@amazon.co.uk>

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
 arch/mips/kvm/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/mips/kvm/Makefile b/arch/mips/kvm/Makefile
index d3710959da55..21ff75bcdbc4 100644
--- a/arch/mips/kvm/Makefile
+++ b/arch/mips/kvm/Makefile
@@ -2,9 +2,10 @@
 # Makefile for KVM support for MIPS
 #
 
+include $(srctree)/virt/kvm/Makefile.kvm
+
 ccflags-y += -Ivirt/kvm -Iarch/mips/kvm
 
-kvm-y := $(addprefix ../../../virt/kvm/, kvm_main.o coalesced_mmio.o eventfd.o binary_stats.o)
 kvm-$(CONFIG_CPU_HAS_MSA) += msa.o
 
 kvm-y +=    mips.o emulate.o entry.o \
-- 
2.31.1

[PATCH 5/7] KVM: RISC-V: Use Makefile.kvm for common files

[David Woodhouse]

From: David Woodhouse <dwmw@amazon.co.uk>

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
 arch/riscv/kvm/Makefile | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/arch/riscv/kvm/Makefile b/arch/riscv/kvm/Makefile
index 30cdd1df0098..300590225348 100644
--- a/arch/riscv/kvm/Makefile
+++ b/arch/riscv/kvm/Makefile
@@ -5,14 +5,10 @@
 
 ccflags-y += -I $(srctree)/$(src)
 
-KVM := ../../../virt/kvm
+include $(srctree)/virt/kvm/Makefile.kvm
 
 obj-$(CONFIG_KVM) += kvm.o
 
-kvm-y += $(KVM)/kvm_main.o
-kvm-y += $(KVM)/coalesced_mmio.o
-kvm-y += $(KVM)/binary_stats.o
-kvm-y += $(KVM)/eventfd.o
 kvm-y += main.o
 kvm-y += vm.o
 kvm-y += vmid.o
-- 
2.31.1

[PATCH 6/7] KVM: powerpc: Use Makefile.kvm for common files

[David Woodhouse]

From: David Woodhouse <dwmw@amazon.co.uk>

It's all fairly baroque but in the end, I don't think there's any reason
for $(KVM)/irqchip.o to have been handled differently, as they all end
up in $(kvm-y) in the end anyway, regardless of whether they get there
via $(common-objs-y) and the CPU-specific object lists.

The generic Makefile.kvm uses HAVE_KVM_IRQCHIP for irqchip.o instead of
HAVE_KVM_IRQ_ROUTING. That change is fine (and arguably correct) because
they are both set together for KVM_MPIC, or neither is set.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
 arch/powerpc/kvm/Makefile | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile
index 583c14ef596e..245f59118413 100644
--- a/arch/powerpc/kvm/Makefile
+++ b/arch/powerpc/kvm/Makefile
@@ -4,11 +4,8 @@
 #
 
 ccflags-y := -Ivirt/kvm -Iarch/powerpc/kvm
-KVM := ../../../virt/kvm
 
-common-objs-y = $(KVM)/kvm_main.o $(KVM)/eventfd.o $(KVM)/binary_stats.o
-common-objs-$(CONFIG_KVM_VFIO) += $(KVM)/vfio.o
-common-objs-$(CONFIG_KVM_MMIO) += $(KVM)/coalesced_mmio.o
+include $(srctree)/virt/kvm/Makefile.kvm
 
 common-objs-y += powerpc.o emulate_loadstore.o
 obj-$(CONFIG_KVM_EXIT_TIMING) += timing.o
@@ -125,7 +122,6 @@ kvm-book3s_32-objs := \
 kvm-objs-$(CONFIG_KVM_BOOK3S_32) := $(kvm-book3s_32-objs)
 
 kvm-objs-$(CONFIG_KVM_MPIC) += mpic.o
-kvm-objs-$(CONFIG_HAVE_KVM_IRQ_ROUTING) += $(KVM)/irqchip.o
 
 kvm-objs := $(kvm-objs-m) $(kvm-objs-y)
 
-- 
2.31.1

Re: [PATCH 6/7] KVM: powerpc: Use Makefile.kvm for common files

[Sean Christopherson]

On Tue, Nov 16, 2021, David Woodhouse wrote:
> From: David Woodhouse <dwmw@amazon.co.uk>
> 
> It's all fairly baroque but in the end, I don't think there's any reason
> for $(KVM)/irqchip.o to have been handled differently, as they all end
> up in $(kvm-y) in the end anyway, regardless of whether they get there
> via $(common-objs-y) and the CPU-specific object lists.
> 
> The generic Makefile.kvm uses HAVE_KVM_IRQCHIP for irqchip.o instead of
> HAVE_KVM_IRQ_ROUTING. That change is fine (and arguably correct) because
> they are both set together for KVM_MPIC, or neither is set.

Nope.

  Symbol: HAVE_KVM_IRQCHIP [=y]
  Type  : bool
  Defined at virt/kvm/Kconfig:7
  Selected by [m]:
    - KVM_XICS [=y] && VIRTUALIZATION [=y] && KVM_BOOK3S_64 [=m] && !KVM_MPIC [=n]
  Selected by [n]:
    - KVM_MPIC [=n] && VIRTUALIZATION [=y] && KVM [=y] && E500 [=n]

leads to this and a whole pile of other errors

arch/powerpc/kvm/../../../virt/kvm/irqchip.c: In function ‘kvm_irq_map_gsi’:
arch/powerpc/kvm/../../../virt/kvm/irqchip.c:31:35: error: invalid use of undefined type ‘struct kvm_irq_routing_table’
   31 |         if (irq_rt && gsi < irq_rt->nr_rt_entries) {
      |                                   ^~


Side topic, please don't post a new version/series in-reply-to a different series.
b4 also gets confused in this case, e.g. it tried to grab the original patch.  b4
has also made me really lazy, heaven forbid I actually had to manually grab these
from mutt :-)

Re: [PATCH 6/7] KVM: powerpc: Use Makefile.kvm for common files

[David Woodhouse]

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On Tue, 2021-11-16 at 18:43 +0000, Sean Christopherson wrote:
> On Tue, Nov 16, 2021, David Woodhouse wrote:
> > From: David Woodhouse <dwmw@amazon.co.uk>
> > 
> > It's all fairly baroque but in the end, I don't think there's any reason
> > for $(KVM)/irqchip.o to have been handled differently, as they all end
> > up in $(kvm-y) in the end anyway, regardless of whether they get there
> > via $(common-objs-y) and the CPU-specific object lists.
> > 
> > The generic Makefile.kvm uses HAVE_KVM_IRQCHIP for irqchip.o instead of
> > HAVE_KVM_IRQ_ROUTING. That change is fine (and arguably correct) because
> > they are both set together for KVM_MPIC, or neither is set.
> 
> Nope.
> 
>   Symbol: HAVE_KVM_IRQCHIP [=y]
>   Type  : bool
>   Defined at virt/kvm/Kconfig:7
>   Selected by [m]:
>     - KVM_XICS [=y] && VIRTUALIZATION [=y] && KVM_BOOK3S_64 [=m] && !KVM_MPIC [=n]
>   Selected by [n]:
>     - KVM_MPIC [=n] && VIRTUALIZATION [=y] && KVM [=y] && E500 [=n]
> 
> leads to this and a whole pile of other errors
> 
> arch/powerpc/kvm/../../../virt/kvm/irqchip.c: In function ‘kvm_irq_map_gsi’:
> arch/powerpc/kvm/../../../virt/kvm/irqchip.c:31:35: error: invalid use of undefined type ‘struct kvm_irq_routing_table’
>    31 |         if (irq_rt && gsi < irq_rt->nr_rt_entries) {
>       |                                   ^~
> 

Hm, perhaps it should have been like this then (incremental):

+++ b/virt/kvm/Makefile.kvm
@@ -9,6 +9,6 @@ kvm-y := $(KVM)/kvm_main.o $(KVM)/eventfd.o $(KVM)/binary_stats.o
 kvm-$(CONFIG_KVM_VFIO) += $(KVM)/vfio.o
 kvm-$(CONFIG_KVM_MMIO) += $(KVM)/coalesced_mmio.o
 kvm-$(CONFIG_KVM_ASYNC_PF) += $(KVM)/async_pf.o
-kvm-$(CONFIG_HAVE_KVM_IRQCHIP) += $(KVM)/irqchip.o
+kvm-$(CONFIG_HAVE_KVM_IRQ_ROUTING) += $(KVM)/irqchip.o
 kvm-$(CONFIG_HAVE_KVM_DIRTY_RING) += $(KVM)/dirty_ring.o
 kvm-$(CONFIG_HAVE_KVM_PFNCACHE) += $(KVM)/pfncache.o


> Side topic, please don't post a new version/series in-reply-to a different series.
> b4 also gets confused in this case, e.g. it tried to grab the original patch.  b4
> has also made me really lazy, heaven forbid I actually had to manually grab these
> from mutt :-)

Sorry ;)

I think that one might even be a new series in reply to what was
already a second series on top of what I was *actually* trying to do
when I first started shaving this yak. Or maybe what I was originally
trying to implement has already been lost in the noise :)

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[PATCH 7/7] KVM: arm64: Use Makefile.kvm for common files

[David Woodhouse]

From: David Woodhouse <dwmw@amazon.co.uk>

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
 arch/arm64/kvm/Makefile | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile
index 989bb5dad2c8..04a53f71a6b6 100644
--- a/arch/arm64/kvm/Makefile
+++ b/arch/arm64/kvm/Makefile
@@ -5,14 +5,12 @@
 
 ccflags-y += -I $(srctree)/$(src)
 
-KVM=../../../virt/kvm
+include $(srctree)/virt/kvm/Makefile.kvm
 
 obj-$(CONFIG_KVM) += kvm.o
 obj-$(CONFIG_KVM) += hyp/
 
-kvm-y := $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o \
-	 $(KVM)/vfio.o $(KVM)/irqchip.o $(KVM)/binary_stats.o \
-	 arm.o mmu.o mmio.o psci.o perf.o hypercalls.o pvtime.o \
+kvm-y += arm.o mmu.o mmio.o psci.o perf.o hypercalls.o pvtime.o \
 	 inject_fault.o va_layout.o handle_exit.o \
 	 guest.o debug.o reset.o sys_regs.o \
 	 vgic-sys-reg-v3.o fpsimd.o pmu.o \
-- 
2.31.1