[PATCH v7 00/11] accel: Allow targets to use Kconfig

[PATCH v7 00/11] accel: Allow targets to use Kconfig

[Philippe Mathieu-Daudé]

Missing review:
- 4/11 rules.mak: Add strequal() and startswith() rules
- 5/11 rules.mak: Add base-arch() rule

This series include generic patches I took of the KVM/ARM
specific series which will follow.

- List orphan accelerators in MAINTAINERS
- Add accel/Kconfig
- Allow targets to use their how Kconfig

Since v6:
- Fixed typo 'startwith' -> 'startswith' (armbru)

Since v5:
- Fixed typo in patch #4 subject
- Added David R-b tag
- Stripped --- comments

Since v4:
- Addressed rth review comments in rules.mak

Since v3:
- Fixed base-arch() rule (rth)
- Dropped 'semihosting: Make the feature depend of TCG'

Since v2:
- Addressed Thomas review comments
- Fixed problem when including TARGET instead of BASE_TARGET

Since v1:
https://www.mail-archive.com/qemu-devel@nongnu.org/msg689024.html
- Drop HVF MAINTAINERS patch (merged elsewhere)
- Kconfig-select SEMIHOSTING (bonzini)
- Drop user-mode selection patches
- consider m68k/nios2/xtensa/riscv (pm215)
- reword Kconfig SEMIHOSTING description (pm215)
- reset some of rth R-b tags

Previous RFC for semihosting posted earlier:
https://www.mail-archive.com/qemu-devel@nongnu.org/msg631218.html

Philippe Mathieu-Daudé (11):
  MAINTAINERS: Fix KVM path expansion glob
  MAINTAINERS: Add an 'overall' entry for accelerators
  MAINTAINERS: Add an entry for the HAX accelerator
  rules.mak: Add strequal() and startswith() rules
  rules.mak: Add base-arch() rule
  Makefile: Remove dangerous EOL trailing backslash
  Makefile: Write MINIKCONF variables as one entry per line
  accel/Kconfig: Extract accel selectors into their own config
  accel/Kconfig: Add the TCG selector
  Makefile: Allow target-specific optional Kconfig
  accel/tcg: Add stub for probe_access()

 Makefile               | 15 +++++++++----
 rules.mak              | 49 ++++++++++++++++++++++++++++++++++++++++++
 accel/stubs/tcg-stub.c |  7 ++++++
 Kconfig.host           |  7 ------
 MAINTAINERS            | 19 +++++++++++++++-
 accel/Kconfig          |  9 ++++++++
 6 files changed, 94 insertions(+), 12 deletions(-)
 create mode 100644 accel/Kconfig

-- 
2.21.3

[PATCH v7 01/11] MAINTAINERS: Fix KVM path expansion glob

[Philippe Mathieu-Daudé]

The KVM files has been moved from target-ARCH to the target/ARCH/
folder in commit fcf5ef2a. Fix the pathname expansion.

Fixes: fcf5ef2a ("Move target-* CPU file into a target/ folder")
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 MAINTAINERS | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/MAINTAINERS b/MAINTAINERS
index 3e7d9cb0a5..948790b433 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -361,7 +361,7 @@ Overall KVM CPUs
 M: Paolo Bonzini <pbonzini@redhat.com>
 L: kvm@vger.kernel.org
 S: Supported
-F: */kvm.*
+F: */*/kvm*
 F: accel/kvm/
 F: accel/stubs/kvm-stub.c
 F: include/hw/kvm/
-- 
2.21.3

[PATCH v7 02/11] MAINTAINERS: Add an 'overall' entry for accelerators

[Philippe Mathieu-Daudé]

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 MAINTAINERS | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 948790b433..f725c12161 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -415,6 +415,17 @@ S: Supported
 F: target/i386/kvm.c
 F: scripts/kvm/vmxcap
 
+Guest CPU Cores (other accelerators)
+------------------------------------
+Overall
+M: Richard Henderson <rth@twiddle.net>
+R: Paolo Bonzini <pbonzini@redhat.com>
+S: Maintained
+F: include/sysemu/accel.h
+F: accel/accel.c
+F: accel/Makefile.objs
+F: accel/stubs/Makefile.objs
+
 X86 HVF CPUs
 M: Roman Bolshakov <r.bolshakov@yadro.com>
 S: Maintained
-- 
2.21.3

[PATCH v7 03/11] MAINTAINERS: Add an entry for the HAX accelerator

[Philippe Mathieu-Daudé]

Nobody replied since the first time [*] that patch was
posted, so mark HAX as orphan.

[*] https://mid.mail-archive.com/20200316120049.11225-4-philmd@redhat.com

Cc: haxm-team@intel.com
Cc: Tao Wu <lepton@google.com>
Cc: Colin Xu <colin.xu@intel.com>
Cc: Wenchao Wang <wenchao.wang@intel.com>
Cc: Vincent Palatin <vpalatin@chromium.org>
Cc: Sergio Andres Gomez Del Real <sergio.g.delreal@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 MAINTAINERS | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index f725c12161..05d7210204 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -426,6 +426,12 @@ F: accel/accel.c
 F: accel/Makefile.objs
 F: accel/stubs/Makefile.objs
 
+HAX Accelerator
+S: Orphan
+F: accel/stubs/hax-stub.c
+F: target/i386/hax-all.c
+F: include/sysemu/hax.h
+
 X86 HVF CPUs
 M: Roman Bolshakov <r.bolshakov@yadro.com>
 S: Maintained
-- 
2.21.3

[PATCH v7 04/11] rules.mak: Add strequal() and startswith() rules

[Philippe Mathieu-Daudé]

Add a rule to test if two strings are equal,
and another to test if a string starts with a substring.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 rules.mak | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/rules.mak b/rules.mak
index 694865b63e..7b58a6b8c5 100644
--- a/rules.mak
+++ b/rules.mak
@@ -191,6 +191,20 @@ ne = $(if $(subst $2,,$1)$(subst $1,,$2),y,n)
 isempty = $(if $1,n,y)
 notempty = $(if $1,y,n)
 
+# strequal
+# Usage: $(call strequal, str1, str2)
+#
+# This macro returns a string (TRUE) when @str1 and @str2
+# are equal, else returns the empty string (FALSE)
+strequal = $(if $(subst $2,,$1)$(subst $1,,$2),,$1)
+
+# startswith
+# Usage: $(call startswith, startstr, fullstr)
+#
+# This macro returns a string (TRUE) when @fullstr starts with
+# @startstr, else returns the empty string (FALSE)
+startswith = $(findstring :$1,:$2)
+
 # Generate files with tracetool
 TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py
 
-- 
2.21.3

Re: [PATCH v7 04/11] rules.mak: Add strequal() and startswith() rules

[Richard Henderson]

On 6/5/20 10:58 AM, Philippe Mathieu-Daudé wrote:
> Add a rule to test if two strings are equal,
> and another to test if a string starts with a substring.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  rules.mak | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

[PATCH v7 05/11] rules.mak: Add base-arch() rule

[Philippe Mathieu-Daudé]

Add a rule to return the base architecture for a QEMU target.

The current list of TARGET_BASE_ARCH is:

  $ git grep  TARGET_BASE_ARCH configure
  configure:7785:TARGET_BASE_ARCH=""
  configure:7795:    TARGET_BASE_ARCH=i386
  configure:7813:    TARGET_BASE_ARCH=arm
  configure:7846:    TARGET_BASE_ARCH=mips
  configure:7854:    TARGET_BASE_ARCH=mips
  configure:7864:    TARGET_BASE_ARCH=openrisc
  configure:7871:    TARGET_BASE_ARCH=ppc
  configure:7879:    TARGET_BASE_ARCH=ppc
  configure:7887:    TARGET_BASE_ARCH=ppc
  configure:7894:    TARGET_BASE_ARCH=riscv
  configure:7900:    TARGET_BASE_ARCH=riscv
  configure:7920:    TARGET_BASE_ARCH=sparc
  configure:7925:    TARGET_BASE_ARCH=sparc

The rule can be tested calling 'print-base-arch-$TARGET':

  $ make \
      print-base-arch-openrisc \
      print-base-arch-aarch64_be \
      print-base-arch-x86_64 \
      print-base-arch-mips64el \
      print-base-arch-ppc64 \
      print-base-arch-riscv64
  openrisc=openrisc
  aarch64_be=arm
  x86_64=i386
  mips64el=mips
  ppc64=ppc
  riscv64=riscv

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 rules.mak | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/rules.mak b/rules.mak
index 7b58a6b8c5..c4f2f35754 100644
--- a/rules.mak
+++ b/rules.mak
@@ -452,3 +452,38 @@ atomic = $(eval $1: $(call sentinel,$1) ; @:) \
 
 print-%:
 	@echo '$*=$($*)'
+
+# base-arch
+# Usage: $(call base-arch, target)
+#
+# @target: the target architecture.
+#
+# This macro will return the base architecture for a target.
+#
+# As example, $(call base-arch, aarch64) returns 'arm'.
+base-arch = $(strip \
+		$(if $(call startswith,aarch64,$1),arm,\
+		  $(if $(call startswith,arm,$1),arm,\
+		    $(if $(call startswith,microblaze,$1),microblaze,\
+		      $(if $(call startswith,mips,$1),mips,\
+		        $(if $(call startswith,ppc,$1),ppc,\
+		          $(if $(call startswith,riscv,$1),riscv,\
+		            $(if $(call startswith,sh4,$1),sh4,\
+		              $(if $(call startswith,sparc,$1),sparc,\
+		                $(if $(call startswith,xtensa,$1),xtensa,\
+		                  $(if $(call strequal,x86_64,$1),i386,\
+		                    $1\
+		                   )\
+		                 )\
+		               )\
+		             )\
+		           )\
+		         )\
+		       )\
+		     )\
+		   )\
+		 )\
+		)
+
+print-base-arch-%:
+	@echo '$*=$(call base-arch,$*)'
-- 
2.21.3

Re: [PATCH v7 05/11] rules.mak: Add base-arch() rule

[Richard Henderson]

On 6/5/20 10:58 AM, Philippe Mathieu-Daudé wrote:
> Add a rule to return the base architecture for a QEMU target.
> 
> The current list of TARGET_BASE_ARCH is:
> 
>   $ git grep  TARGET_BASE_ARCH configure
>   configure:7785:TARGET_BASE_ARCH=""
>   configure:7795:    TARGET_BASE_ARCH=i386
>   configure:7813:    TARGET_BASE_ARCH=arm
>   configure:7846:    TARGET_BASE_ARCH=mips
>   configure:7854:    TARGET_BASE_ARCH=mips
>   configure:7864:    TARGET_BASE_ARCH=openrisc
>   configure:7871:    TARGET_BASE_ARCH=ppc
>   configure:7879:    TARGET_BASE_ARCH=ppc
>   configure:7887:    TARGET_BASE_ARCH=ppc
>   configure:7894:    TARGET_BASE_ARCH=riscv
>   configure:7900:    TARGET_BASE_ARCH=riscv
>   configure:7920:    TARGET_BASE_ARCH=sparc
>   configure:7925:    TARGET_BASE_ARCH=sparc
> 
> The rule can be tested calling 'print-base-arch-$TARGET':
> 
>   $ make \
>       print-base-arch-openrisc \
>       print-base-arch-aarch64_be \
>       print-base-arch-x86_64 \
>       print-base-arch-mips64el \
>       print-base-arch-ppc64 \
>       print-base-arch-riscv64
>   openrisc=openrisc
>   aarch64_be=arm
>   x86_64=i386
>   mips64el=mips
>   ppc64=ppc
>   riscv64=riscv
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  rules.mak | 35 +++++++++++++++++++++++++++++++++++
>  1 file changed, 35 insertions(+)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

[PATCH v7 06/11] Makefile: Remove dangerous EOL trailing backslash

[Philippe Mathieu-Daudé]

One might get caught trying to understand unexpected Makefile
behavior. Trailing backslash can help to split very long lines,
but are rather dangerous when nothing follow. Preserve other
developers debugging time by removing this one.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 40e4f7677b..6c9d718b2c 100644
--- a/Makefile
+++ b/Makefile
@@ -420,7 +420,7 @@ MINIKCONF_ARGS = \
 
 MINIKCONF_INPUTS = $(SRC_PATH)/Kconfig.host $(SRC_PATH)/hw/Kconfig
 MINIKCONF_DEPS = $(MINIKCONF_INPUTS) $(wildcard $(SRC_PATH)/hw/*/Kconfig)
-MINIKCONF = $(PYTHON) $(SRC_PATH)/scripts/minikconf.py \
+MINIKCONF = $(PYTHON) $(SRC_PATH)/scripts/minikconf.py
 
 $(SUBDIR_DEVICES_MAK): %/config-devices.mak: default-configs/%.mak $(MINIKCONF_DEPS) $(BUILD_DIR)/config-host.mak
 	$(call quiet-command, $(MINIKCONF) $(MINIKCONF_ARGS) > $@.tmp, "GEN", "$@.tmp")
-- 
2.21.3

Re: [PATCH v7 06/11] Makefile: Remove dangerous EOL trailing backslash

[Richard Henderson]

On 6/5/20 10:58 AM, Philippe Mathieu-Daudé wrote:
> One might get caught trying to understand unexpected Makefile
> behavior. Trailing backslash can help to split very long lines,
> but are rather dangerous when nothing follow. Preserve other
> developers debugging time by removing this one.
> 
> Reviewed-by: Thomas Huth <thuth@redhat.com>
> Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~

[PATCH v7 07/11] Makefile: Write MINIKCONF variables as one entry per line

[Philippe Mathieu-Daudé]

Having one entry per line helps reviews/refactors. As we are
going to modify the MINIKCONF variables, split them now to
ease further review.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 Makefile | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index 6c9d718b2c..7666f81e8a 100644
--- a/Makefile
+++ b/Makefile
@@ -418,12 +418,15 @@ MINIKCONF_ARGS = \
     CONFIG_LINUX=$(CONFIG_LINUX) \
     CONFIG_PVRDMA=$(CONFIG_PVRDMA)
 
-MINIKCONF_INPUTS = $(SRC_PATH)/Kconfig.host $(SRC_PATH)/hw/Kconfig
-MINIKCONF_DEPS = $(MINIKCONF_INPUTS) $(wildcard $(SRC_PATH)/hw/*/Kconfig)
+MINIKCONF_INPUTS = $(SRC_PATH)/Kconfig.host \
+                   $(SRC_PATH)/hw/Kconfig
+MINIKCONF_DEPS = $(MINIKCONF_INPUTS) \
+                 $(wildcard $(SRC_PATH)/hw/*/Kconfig)
 MINIKCONF = $(PYTHON) $(SRC_PATH)/scripts/minikconf.py
 
 $(SUBDIR_DEVICES_MAK): %/config-devices.mak: default-configs/%.mak $(MINIKCONF_DEPS) $(BUILD_DIR)/config-host.mak
-	$(call quiet-command, $(MINIKCONF) $(MINIKCONF_ARGS) > $@.tmp, "GEN", "$@.tmp")
+	$(call quiet-command, $(MINIKCONF) $(MINIKCONF_ARGS) \
+		> $@.tmp, "GEN", "$@.tmp")
 	$(call quiet-command, if test -f $@; then \
 	  if cmp -s $@.old $@; then \
 	    mv $@.tmp $@; \
-- 
2.21.3

[PATCH v7 08/11] accel/Kconfig: Extract accel selectors into their own config

[Philippe Mathieu-Daudé]

Move the accel selectors from the global Kconfig.host to their
own Kconfig file.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 Makefile      | 1 +
 Kconfig.host  | 7 -------
 accel/Kconfig | 6 ++++++
 3 files changed, 7 insertions(+), 7 deletions(-)
 create mode 100644 accel/Kconfig

diff --git a/Makefile b/Makefile
index 7666f81e8a..648757f79a 100644
--- a/Makefile
+++ b/Makefile
@@ -419,6 +419,7 @@ MINIKCONF_ARGS = \
     CONFIG_PVRDMA=$(CONFIG_PVRDMA)
 
 MINIKCONF_INPUTS = $(SRC_PATH)/Kconfig.host \
+                   $(SRC_PATH)/accel/Kconfig \
                    $(SRC_PATH)/hw/Kconfig
 MINIKCONF_DEPS = $(MINIKCONF_INPUTS) \
                  $(wildcard $(SRC_PATH)/hw/*/Kconfig)
diff --git a/Kconfig.host b/Kconfig.host
index 55136e037d..a6d871c399 100644
--- a/Kconfig.host
+++ b/Kconfig.host
@@ -2,9 +2,6 @@
 # down to Kconfig.  See also MINIKCONF_ARGS in the Makefile:
 # these two need to be kept in sync.
 
-config KVM
-    bool
-
 config LINUX
     bool
 
@@ -31,10 +28,6 @@ config VHOST_KERNEL
     bool
     select VHOST
 
-config XEN
-    bool
-    select FSDEV_9P if VIRTFS
-
 config VIRTFS
     bool
 
diff --git a/accel/Kconfig b/accel/Kconfig
new file mode 100644
index 0000000000..c21802bb49
--- /dev/null
+++ b/accel/Kconfig
@@ -0,0 +1,6 @@
+config KVM
+    bool
+
+config XEN
+    bool
+    select FSDEV_9P if VIRTFS
-- 
2.21.3

[PATCH v7 09/11] accel/Kconfig: Add the TCG selector

[Philippe Mathieu-Daudé]

Expose the CONFIG_TCG selector to let minikconf.py uses it.

When building with --disable-tcg build, this helps to deselect
devices that are TCG-dependent.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 Makefile      | 1 +
 accel/Kconfig | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/Makefile b/Makefile
index 648757f79a..f8a45e1379 100644
--- a/Makefile
+++ b/Makefile
@@ -405,6 +405,7 @@ endif
 MINIKCONF_ARGS = \
     $(CONFIG_MINIKCONF_MODE) \
     $@ $*/config-devices.mak.d $< $(MINIKCONF_INPUTS) \
+    CONFIG_TCG=$(CONFIG_TCG) \
     CONFIG_KVM=$(CONFIG_KVM) \
     CONFIG_SPICE=$(CONFIG_SPICE) \
     CONFIG_IVSHMEM=$(CONFIG_IVSHMEM) \
diff --git a/accel/Kconfig b/accel/Kconfig
index c21802bb49..2ad94a3839 100644
--- a/accel/Kconfig
+++ b/accel/Kconfig
@@ -1,3 +1,6 @@
+config TCG
+    bool
+
 config KVM
     bool
 
-- 
2.21.3

[PATCH v7 10/11] Makefile: Allow target-specific optional Kconfig

[Philippe Mathieu-Daudé]

Allow use of target-specific Kconfig file.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 Makefile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index f8a45e1379..d5009cd304 100644
--- a/Makefile
+++ b/Makefile
@@ -423,11 +423,13 @@ MINIKCONF_INPUTS = $(SRC_PATH)/Kconfig.host \
                    $(SRC_PATH)/accel/Kconfig \
                    $(SRC_PATH)/hw/Kconfig
 MINIKCONF_DEPS = $(MINIKCONF_INPUTS) \
-                 $(wildcard $(SRC_PATH)/hw/*/Kconfig)
+                 $(wildcard $(SRC_PATH)/hw/*/Kconfig) \
+                 $(wildcard $(SRC_PATH)/target/*/Kconfig)
 MINIKCONF = $(PYTHON) $(SRC_PATH)/scripts/minikconf.py
 
 $(SUBDIR_DEVICES_MAK): %/config-devices.mak: default-configs/%.mak $(MINIKCONF_DEPS) $(BUILD_DIR)/config-host.mak
 	$(call quiet-command, $(MINIKCONF) $(MINIKCONF_ARGS) \
+		$(wildcard $(SRC_PATH)/target/$(call base-arch, $(firstword $(subst -, ,$@)))/Kconfig) \
 		> $@.tmp, "GEN", "$@.tmp")
 	$(call quiet-command, if test -f $@; then \
 	  if cmp -s $@.old $@; then \
-- 
2.21.3

[PATCH v7 11/11] accel/tcg: Add stub for probe_access()

[Philippe Mathieu-Daudé]

From: Philippe Mathieu-Daudé <f4bug@amsat.org>

The TCG helpers where added in b92e5a22ec3 in softmmu_template.h.
probe_write() was added in there in 3b4afc9e75a to be moved out
to accel/tcg/cputlb.c in 3b08f0a9254, and was later refactored
as probe_access() in c25c283df0f.
Since it is a TCG specific helper, add a stub to avoid failures
when building without TCG, such:

  target/arm/helper.o: In function `probe_read':
  include/exec/exec-all.h:362: undefined reference to `probe_access'

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 accel/stubs/tcg-stub.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/accel/stubs/tcg-stub.c b/accel/stubs/tcg-stub.c
index 677191a69c..e4bbf997aa 100644
--- a/accel/stubs/tcg-stub.c
+++ b/accel/stubs/tcg-stub.c
@@ -22,3 +22,10 @@ void tb_flush(CPUState *cpu)
 void tlb_set_dirty(CPUState *cpu, target_ulong vaddr)
 {
 }
+
+void *probe_access(CPUArchState *env, target_ulong addr, int size,
+                   MMUAccessType access_type, int mmu_idx, uintptr_t retaddr)
+{
+     /* Handled by hardware accelerator. */
+     g_assert_not_reached();
+}
-- 
2.21.3