[PATCH v4 00/17] make system memory API available for common code

[PATCH v4 00/17] make system memory API available for common code

[Pierrick Bouvier]

The main goal of this series is to be able to call any memory ld/st function
from code that is *not* target dependent. As a positive side effect, we can
turn related system compilation units into common code.

The first 5 patches remove dependency of memory API to cpu headers and remove
dependency to target specific code. This could be a series on its own, but it's
great to be able to turn system memory compilation units into common code to
make sure it can't regress, and prove it achieves the desired result.

The next patches remove more dependencies on cpu headers (exec-all,
memory-internal, ram_addr).
Then, we add access to a needed function from kvm, some xen stubs, and we
finally can turn our compilation units into common code.

Every commit was tested to build correctly for all targets (on windows, linux,
macos), and the series was fully tested by running all tests we have (linux,
x86_64 host).

v2:
- reorder first commits (tswap change first, so memory cached functions can use it)
- move st/ld*_p functions to tswap instead of bswap
- add define for target_words_bigendian when COMPILING_PER_TARGET, equals to
  TARGET_BIG_ENDIAN (avoid overhead in target code)
- rewrite devend_memop
- remove useless exec-all.h in concerned patch
- extract devend_big_endian function to reuse in system/memory.c
- rewrite changes to system/memory.c

v3:
- move devend functions to memory_internal.h
- completed description for commits removing cpu.h dependency

v4:
- rebase on top of master
  * missing include in 'codebase: prepare to remove cpu.h from exec/exec-all.h'
  * meson build conflict

Pierrick Bouvier (17):
  exec/tswap: target code can use TARGET_BIG_ENDIAN instead of
    target_words_bigendian()
  exec/tswap: implement {ld,st}.*_p as functions instead of macros
  exec/memory_ldst: extract memory_ldst declarations from cpu-all.h
  exec/memory_ldst_phys: extract memory_ldst_phys declarations from
    cpu-all.h
  exec/memory.h: make devend_memop "target defines" agnostic
  codebase: prepare to remove cpu.h from exec/exec-all.h
  exec/exec-all: remove dependency on cpu.h
  exec/memory-internal: remove dependency on cpu.h
  exec/ram_addr: remove dependency on cpu.h
  system/kvm: make kvm_flush_coalesced_mmio_buffer() accessible for
    common code
  exec/ram_addr: call xen_hvm_modified_memory only if xen is enabled
  hw/xen: add stubs for various functions
  system/physmem: compilation unit is now common to all targets
  include/exec/memory: extract devend_big_endian from devend_memop
  include/exec/memory: move devend functions to memory-internal.h
  system/memory: make compilation unit common
  system/ioport: make compilation unit common

 include/exec/cpu-all.h              | 66 -----------------------
 include/exec/exec-all.h             |  1 -
 include/exec/memory-internal.h      | 21 +++++++-
 include/exec/memory.h               | 30 ++++-------
 include/exec/ram_addr.h             | 11 ++--
 include/exec/tswap.h                | 81 +++++++++++++++++++++++++++--
 include/system/kvm.h                |  6 +--
 include/tcg/tcg-op.h                |  1 +
 target/ppc/helper_regs.h            |  2 +
 include/exec/memory_ldst.h.inc      |  4 --
 include/exec/memory_ldst_phys.h.inc |  5 +-
 cpu-target.c                        |  1 +
 hw/ppc/spapr_nested.c               |  1 +
 hw/sh4/sh7750.c                     |  1 +
 hw/xen/xen_stubs.c                  | 56 ++++++++++++++++++++
 page-vary-target.c                  |  2 +-
 system/ioport.c                     |  1 -
 system/memory.c                     | 17 ++----
 target/ppc/tcg-excp_helper.c        |  1 +
 target/riscv/bitmanip_helper.c      |  2 +-
 hw/xen/meson.build                  |  3 ++
 system/meson.build                  |  6 +--
 22 files changed, 193 insertions(+), 126 deletions(-)
 create mode 100644 hw/xen/xen_stubs.c

-- 
2.39.5

[PATCH v4 01/17] exec/tswap: target code can use TARGET_BIG_ENDIAN instead of target_words_bigendian()

[Pierrick Bouvier]

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 include/exec/tswap.h | 11 ++++++-----
 cpu-target.c         |  1 +
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/include/exec/tswap.h b/include/exec/tswap.h
index ecd4faef015..2683da0adb7 100644
--- a/include/exec/tswap.h
+++ b/include/exec/tswap.h
@@ -13,13 +13,14 @@
 /**
  * target_words_bigendian:
  * Returns true if the (default) endianness of the target is big endian,
- * false otherwise. Note that in target-specific code, you can use
- * TARGET_BIG_ENDIAN directly instead. On the other hand, common
- * code should normally never need to know about the endianness of the
- * target, so please do *not* use this function unless you know very well
- * what you are doing!
+ * false otherwise. Common code should normally never need to know about the
+ * endianness of the target, so please do *not* use this function unless you
+ * know very well what you are doing!
  */
 bool target_words_bigendian(void);
+#ifdef COMPILING_PER_TARGET
+#define target_words_bigendian()  TARGET_BIG_ENDIAN
+#endif
 
 /*
  * If we're in target-specific code, we can hard-code the swapping
diff --git a/cpu-target.c b/cpu-target.c
index cae77374b38..519b0f89005 100644
--- a/cpu-target.c
+++ b/cpu-target.c
@@ -155,6 +155,7 @@ void cpu_abort(CPUState *cpu, const char *fmt, ...)
     abort();
 }
 
+#undef target_words_bigendian
 bool target_words_bigendian(void)
 {
     return TARGET_BIG_ENDIAN;
-- 
2.39.5

[PATCH v4 02/17] exec/tswap: implement {ld, st}.*_p as functions instead of macros

[Pierrick Bouvier]

Defining functions allows to use them from common code, by not depending
on TARGET_BIG_ENDIAN.
Remove previous macros from exec/cpu-all.h.
By moving them out of cpu-all.h, we'll be able to break dependency on
cpu.h for memory related functions coming in next commits.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 include/exec/cpu-all.h | 25 ---------------
 include/exec/tswap.h   | 70 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+), 25 deletions(-)

diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index 8cd6c00cf89..e56c064d46f 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -38,31 +38,6 @@
 #define BSWAP_NEEDED
 #endif
 
-/* Target-endianness CPU memory access functions. These fit into the
- * {ld,st}{type}{sign}{size}{endian}_p naming scheme described in bswap.h.
- */
-#if TARGET_BIG_ENDIAN
-#define lduw_p(p) lduw_be_p(p)
-#define ldsw_p(p) ldsw_be_p(p)
-#define ldl_p(p) ldl_be_p(p)
-#define ldq_p(p) ldq_be_p(p)
-#define stw_p(p, v) stw_be_p(p, v)
-#define stl_p(p, v) stl_be_p(p, v)
-#define stq_p(p, v) stq_be_p(p, v)
-#define ldn_p(p, sz) ldn_be_p(p, sz)
-#define stn_p(p, sz, v) stn_be_p(p, sz, v)
-#else
-#define lduw_p(p) lduw_le_p(p)
-#define ldsw_p(p) ldsw_le_p(p)
-#define ldl_p(p) ldl_le_p(p)
-#define ldq_p(p) ldq_le_p(p)
-#define stw_p(p, v) stw_le_p(p, v)
-#define stl_p(p, v) stl_le_p(p, v)
-#define stq_p(p, v) stq_le_p(p, v)
-#define ldn_p(p, sz) ldn_le_p(p, sz)
-#define stn_p(p, sz, v) stn_le_p(p, sz, v)
-#endif
-
 /* MMU memory access macros */
 
 #if !defined(CONFIG_USER_ONLY)
diff --git a/include/exec/tswap.h b/include/exec/tswap.h
index 2683da0adb7..84060a49994 100644
--- a/include/exec/tswap.h
+++ b/include/exec/tswap.h
@@ -80,4 +80,74 @@ static inline void tswap64s(uint64_t *s)
     }
 }
 
+/* Return ld{word}_{le,be}_p following target endianness. */
+#define LOAD_IMPL(word, args...)                    \
+do {                                                \
+    if (target_words_bigendian()) {                 \
+        return glue(glue(ld, word), _be_p)(args);   \
+    } else {                                        \
+        return glue(glue(ld, word), _le_p)(args);   \
+    }                                               \
+} while (0)
+
+static inline int lduw_p(const void *ptr)
+{
+    LOAD_IMPL(uw, ptr);
+}
+
+static inline int ldsw_p(const void *ptr)
+{
+    LOAD_IMPL(sw, ptr);
+}
+
+static inline int ldl_p(const void *ptr)
+{
+    LOAD_IMPL(l, ptr);
+}
+
+static inline uint64_t ldq_p(const void *ptr)
+{
+    LOAD_IMPL(q, ptr);
+}
+
+static inline uint64_t ldn_p(const void *ptr, int sz)
+{
+    LOAD_IMPL(n, ptr, sz);
+}
+
+#undef LOAD_IMPL
+
+/* Call st{word}_{le,be}_p following target endianness. */
+#define STORE_IMPL(word, args...)           \
+do {                                        \
+    if (target_words_bigendian()) {         \
+        glue(glue(st, word), _be_p)(args);  \
+    } else {                                \
+        glue(glue(st, word), _le_p)(args);  \
+    }                                       \
+} while (0)
+
+
+static inline void stw_p(void *ptr, uint16_t v)
+{
+    STORE_IMPL(w, ptr, v);
+}
+
+static inline void stl_p(void *ptr, uint32_t v)
+{
+    STORE_IMPL(l, ptr, v);
+}
+
+static inline void stq_p(void *ptr, uint64_t v)
+{
+    STORE_IMPL(q, ptr, v);
+}
+
+static inline void stn_p(void *ptr, int sz, uint64_t v)
+{
+    STORE_IMPL(n, ptr, sz, v);
+}
+
+#undef STORE_IMPL
+
 #endif  /* TSWAP_H */
-- 
2.39.5

[PATCH v4 03/17] exec/memory_ldst: extract memory_ldst declarations from cpu-all.h

[Pierrick Bouvier]

They are now accessible through exec/memory.h instead, and we make sure
all variants are available for common or target dependent code.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 include/exec/cpu-all.h         | 12 ------------
 include/exec/memory_ldst.h.inc |  4 ----
 2 files changed, 16 deletions(-)

diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index e56c064d46f..0e8205818a4 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -44,18 +44,6 @@
 
 #include "exec/hwaddr.h"
 
-#define SUFFIX
-#define ARG1         as
-#define ARG1_DECL    AddressSpace *as
-#define TARGET_ENDIANNESS
-#include "exec/memory_ldst.h.inc"
-
-#define SUFFIX       _cached_slow
-#define ARG1         cache
-#define ARG1_DECL    MemoryRegionCache *cache
-#define TARGET_ENDIANNESS
-#include "exec/memory_ldst.h.inc"
-
 static inline void stl_phys_notdirty(AddressSpace *as, hwaddr addr, uint32_t val)
 {
     address_space_stl_notdirty(as, addr, val,
diff --git a/include/exec/memory_ldst.h.inc b/include/exec/memory_ldst.h.inc
index 92ad74e9560..7270235c600 100644
--- a/include/exec/memory_ldst.h.inc
+++ b/include/exec/memory_ldst.h.inc
@@ -19,7 +19,6 @@
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifdef TARGET_ENDIANNESS
 uint16_t glue(address_space_lduw, SUFFIX)(ARG1_DECL,
     hwaddr addr, MemTxAttrs attrs, MemTxResult *result);
 uint32_t glue(address_space_ldl, SUFFIX)(ARG1_DECL,
@@ -34,7 +33,6 @@ void glue(address_space_stl, SUFFIX)(ARG1_DECL,
     hwaddr addr, uint32_t val, MemTxAttrs attrs, MemTxResult *result);
 void glue(address_space_stq, SUFFIX)(ARG1_DECL,
     hwaddr addr, uint64_t val, MemTxAttrs attrs, MemTxResult *result);
-#else
 uint8_t glue(address_space_ldub, SUFFIX)(ARG1_DECL,
     hwaddr addr, MemTxAttrs attrs, MemTxResult *result);
 uint16_t glue(address_space_lduw_le, SUFFIX)(ARG1_DECL,
@@ -63,9 +61,7 @@ void glue(address_space_stq_le, SUFFIX)(ARG1_DECL,
     hwaddr addr, uint64_t val, MemTxAttrs attrs, MemTxResult *result);
 void glue(address_space_stq_be, SUFFIX)(ARG1_DECL,
     hwaddr addr, uint64_t val, MemTxAttrs attrs, MemTxResult *result);
-#endif
 
 #undef ARG1_DECL
 #undef ARG1
 #undef SUFFIX
-#undef TARGET_ENDIANNESS
-- 
2.39.5

[PATCH v4 04/17] exec/memory_ldst_phys: extract memory_ldst_phys declarations from cpu-all.h

[Pierrick Bouvier]

They are now accessible through exec/memory.h instead, and we make sure
all variants are available for common or target dependent code.

Move stl_phys_notdirty function as well.
Cached endianness agnostic version rely on st/ld*_p, which is available
through tswap.h.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 include/exec/cpu-all.h              | 29 -----------------------------
 include/exec/memory.h               | 10 ++++++++++
 include/exec/memory_ldst_phys.h.inc |  5 +----
 3 files changed, 11 insertions(+), 33 deletions(-)

diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index 0e8205818a4..902ca1f3c7b 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -38,35 +38,6 @@
 #define BSWAP_NEEDED
 #endif
 
-/* MMU memory access macros */
-
-#if !defined(CONFIG_USER_ONLY)
-
-#include "exec/hwaddr.h"
-
-static inline void stl_phys_notdirty(AddressSpace *as, hwaddr addr, uint32_t val)
-{
-    address_space_stl_notdirty(as, addr, val,
-                               MEMTXATTRS_UNSPECIFIED, NULL);
-}
-
-#define SUFFIX
-#define ARG1         as
-#define ARG1_DECL    AddressSpace *as
-#define TARGET_ENDIANNESS
-#include "exec/memory_ldst_phys.h.inc"
-
-/* Inline fast path for direct RAM access.  */
-#define ENDIANNESS
-#include "exec/memory_ldst_cached.h.inc"
-
-#define SUFFIX       _cached
-#define ARG1         cache
-#define ARG1_DECL    MemoryRegionCache *cache
-#define TARGET_ENDIANNESS
-#include "exec/memory_ldst_phys.h.inc"
-#endif
-
 /* page related stuff */
 #include "exec/cpu-defs.h"
 #include "exec/target_page.h"
diff --git a/include/exec/memory.h b/include/exec/memory.h
index d09af58c971..da21e9150b5 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -21,6 +21,7 @@
 #include "exec/memattrs.h"
 #include "exec/memop.h"
 #include "exec/ramlist.h"
+#include "exec/tswap.h"
 #include "qemu/bswap.h"
 #include "qemu/queue.h"
 #include "qemu/int128.h"
@@ -2732,6 +2733,12 @@ MemTxResult address_space_write_rom(AddressSpace *as, hwaddr addr,
 #define ARG1_DECL    AddressSpace *as
 #include "exec/memory_ldst.h.inc"
 
+static inline void stl_phys_notdirty(AddressSpace *as, hwaddr addr, uint32_t val)
+{
+    address_space_stl_notdirty(as, addr, val,
+                               MEMTXATTRS_UNSPECIFIED, NULL);
+}
+
 #define SUFFIX
 #define ARG1         as
 #define ARG1_DECL    AddressSpace *as
@@ -2798,6 +2805,9 @@ static inline void address_space_stb_cached(MemoryRegionCache *cache,
     }
 }
 
+#define ENDIANNESS
+#include "exec/memory_ldst_cached.h.inc"
+
 #define ENDIANNESS   _le
 #include "exec/memory_ldst_cached.h.inc"
 
diff --git a/include/exec/memory_ldst_phys.h.inc b/include/exec/memory_ldst_phys.h.inc
index ecd678610d1..db67de75251 100644
--- a/include/exec/memory_ldst_phys.h.inc
+++ b/include/exec/memory_ldst_phys.h.inc
@@ -19,7 +19,6 @@
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifdef TARGET_ENDIANNESS
 static inline uint16_t glue(lduw_phys, SUFFIX)(ARG1_DECL, hwaddr addr)
 {
     return glue(address_space_lduw, SUFFIX)(ARG1, addr,
@@ -55,7 +54,7 @@ static inline void glue(stq_phys, SUFFIX)(ARG1_DECL, hwaddr addr, uint64_t val)
     glue(address_space_stq, SUFFIX)(ARG1, addr, val,
                                     MEMTXATTRS_UNSPECIFIED, NULL);
 }
-#else
+
 static inline uint8_t glue(ldub_phys, SUFFIX)(ARG1_DECL, hwaddr addr)
 {
     return glue(address_space_ldub, SUFFIX)(ARG1, addr,
@@ -139,9 +138,7 @@ static inline void glue(stq_be_phys, SUFFIX)(ARG1_DECL, hwaddr addr, uint64_t va
     glue(address_space_stq_be, SUFFIX)(ARG1, addr, val,
                                        MEMTXATTRS_UNSPECIFIED, NULL);
 }
-#endif
 
 #undef ARG1_DECL
 #undef ARG1
 #undef SUFFIX
-#undef TARGET_ENDIANNESS
-- 
2.39.5

[PATCH v4 05/17] exec/memory.h: make devend_memop "target defines" agnostic

[Pierrick Bouvier]

Will allow to make system/memory.c common later.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 include/exec/memory.h | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/include/exec/memory.h b/include/exec/memory.h
index da21e9150b5..069021ac3ff 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -3138,25 +3138,17 @@ address_space_write_cached(MemoryRegionCache *cache, hwaddr addr,
 MemTxResult address_space_set(AddressSpace *as, hwaddr addr,
                               uint8_t c, hwaddr len, MemTxAttrs attrs);
 
-#ifdef COMPILING_PER_TARGET
 /* enum device_endian to MemOp.  */
 static inline MemOp devend_memop(enum device_endian end)
 {
     QEMU_BUILD_BUG_ON(DEVICE_HOST_ENDIAN != DEVICE_LITTLE_ENDIAN &&
                       DEVICE_HOST_ENDIAN != DEVICE_BIG_ENDIAN);
 
-#if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN
-    /* Swap if non-host endianness or native (target) endianness */
-    return (end == DEVICE_HOST_ENDIAN) ? 0 : MO_BSWAP;
-#else
-    const int non_host_endianness =
-        DEVICE_LITTLE_ENDIAN ^ DEVICE_BIG_ENDIAN ^ DEVICE_HOST_ENDIAN;
-
-    /* In this case, native (target) endianness needs no swap.  */
-    return (end == non_host_endianness) ? MO_BSWAP : 0;
-#endif
+    bool big_endian = (end == DEVICE_NATIVE_ENDIAN
+                       ? target_words_bigendian()
+                       : end == DEVICE_BIG_ENDIAN);
+    return big_endian ? MO_BE : MO_LE;
 }
-#endif /* COMPILING_PER_TARGET */
 
 /*
  * Inhibit technologies that require discarding of pages in RAM blocks, e.g.,
-- 
2.39.5

[PATCH v4 06/17] codebase: prepare to remove cpu.h from exec/exec-all.h

[Pierrick Bouvier]

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 include/tcg/tcg-op.h           | 1 +
 target/ppc/helper_regs.h       | 2 ++
 hw/ppc/spapr_nested.c          | 1 +
 hw/sh4/sh7750.c                | 1 +
 page-vary-target.c             | 2 +-
 target/ppc/tcg-excp_helper.c   | 1 +
 target/riscv/bitmanip_helper.c | 2 +-
 7 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/include/tcg/tcg-op.h b/include/tcg/tcg-op.h
index a02850583bd..bc46b5570c4 100644
--- a/include/tcg/tcg-op.h
+++ b/include/tcg/tcg-op.h
@@ -9,6 +9,7 @@
 #define TCG_TCG_OP_H
 
 #include "tcg/tcg-op-common.h"
+#include "exec/target_long.h"
 
 #ifndef TARGET_LONG_BITS
 #error must include QEMU headers
diff --git a/target/ppc/helper_regs.h b/target/ppc/helper_regs.h
index 8196c1346dc..b928c2c452d 100644
--- a/target/ppc/helper_regs.h
+++ b/target/ppc/helper_regs.h
@@ -20,6 +20,8 @@
 #ifndef HELPER_REGS_H
 #define HELPER_REGS_H
 
+#include "target/ppc/cpu.h"
+
 void hreg_swap_gpr_tgpr(CPUPPCState *env);
 void hreg_compute_hflags(CPUPPCState *env);
 void hreg_update_pmu_hflags(CPUPPCState *env);
diff --git a/hw/ppc/spapr_nested.c b/hw/ppc/spapr_nested.c
index 201f6292033..a79e398c132 100644
--- a/hw/ppc/spapr_nested.c
+++ b/hw/ppc/spapr_nested.c
@@ -2,6 +2,7 @@
 #include "qemu/cutils.h"
 #include "exec/exec-all.h"
 #include "exec/cputlb.h"
+#include "exec/target_long.h"
 #include "helper_regs.h"
 #include "hw/ppc/ppc.h"
 #include "hw/ppc/spapr.h"
diff --git a/hw/sh4/sh7750.c b/hw/sh4/sh7750.c
index 6faf0e3ca8b..41306fb6008 100644
--- a/hw/sh4/sh7750.c
+++ b/hw/sh4/sh7750.c
@@ -29,6 +29,7 @@
 #include "hw/irq.h"
 #include "hw/sh4/sh.h"
 #include "system/system.h"
+#include "target/sh4/cpu.h"
 #include "hw/qdev-properties.h"
 #include "hw/qdev-properties-system.h"
 #include "sh7750_regs.h"
diff --git a/page-vary-target.c b/page-vary-target.c
index 3f81144cda8..84ddeb7c26a 100644
--- a/page-vary-target.c
+++ b/page-vary-target.c
@@ -21,7 +21,7 @@
 
 #include "qemu/osdep.h"
 #include "exec/page-vary.h"
-#include "exec/exec-all.h"
+#include "exec/target_page.h"
 
 bool set_preferred_target_page_bits(int bits)
 {
diff --git a/target/ppc/tcg-excp_helper.c b/target/ppc/tcg-excp_helper.c
index 5a189dc3d70..c422648cfdd 100644
--- a/target/ppc/tcg-excp_helper.c
+++ b/target/ppc/tcg-excp_helper.c
@@ -19,6 +19,7 @@
 #include "qemu/osdep.h"
 #include "qemu/main-loop.h"
 #include "qemu/log.h"
+#include "target/ppc/cpu.h"
 #include "exec/cpu_ldst.h"
 #include "exec/exec-all.h"
 #include "exec/helper-proto.h"
diff --git a/target/riscv/bitmanip_helper.c b/target/riscv/bitmanip_helper.c
index b99c4a39a1f..e9c8d7f7780 100644
--- a/target/riscv/bitmanip_helper.c
+++ b/target/riscv/bitmanip_helper.c
@@ -20,7 +20,7 @@
 
 #include "qemu/osdep.h"
 #include "qemu/host-utils.h"
-#include "exec/exec-all.h"
+#include "exec/target_long.h"
 #include "exec/helper-proto.h"
 #include "tcg/tcg.h"
 
-- 
2.39.5

[PATCH v4 07/17] exec/exec-all: remove dependency on cpu.h

[Pierrick Bouvier]

Previous commit changed files relying transitively on it.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 include/exec/exec-all.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index dd5c40f2233..19b0eda44a7 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -20,7 +20,6 @@
 #ifndef EXEC_ALL_H
 #define EXEC_ALL_H
 
-#include "cpu.h"
 #if defined(CONFIG_USER_ONLY)
 #include "exec/cpu_ldst.h"
 #endif
-- 
2.39.5

[PATCH v4 08/17] exec/memory-internal: remove dependency on cpu.h

[Pierrick Bouvier]

Needed so compilation units including it can be common.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 include/exec/memory-internal.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/include/exec/memory-internal.h b/include/exec/memory-internal.h
index 100c1237ac2..b729f3b25ad 100644
--- a/include/exec/memory-internal.h
+++ b/include/exec/memory-internal.h
@@ -20,8 +20,6 @@
 #ifndef MEMORY_INTERNAL_H
 #define MEMORY_INTERNAL_H
 
-#include "cpu.h"
-
 #ifndef CONFIG_USER_ONLY
 static inline AddressSpaceDispatch *flatview_to_dispatch(FlatView *fv)
 {
-- 
2.39.5

[PATCH v4 09/17] exec/ram_addr: remove dependency on cpu.h

[Pierrick Bouvier]

Needed so compilation units including it can be common.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 include/exec/ram_addr.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
index e4c28fbec9b..f5d574261a3 100644
--- a/include/exec/ram_addr.h
+++ b/include/exec/ram_addr.h
@@ -20,13 +20,14 @@
 #define RAM_ADDR_H
 
 #ifndef CONFIG_USER_ONLY
-#include "cpu.h"
 #include "system/xen.h"
 #include "system/tcg.h"
 #include "exec/cputlb.h"
 #include "exec/ramlist.h"
 #include "exec/ramblock.h"
 #include "exec/exec-all.h"
+#include "exec/memory.h"
+#include "exec/target_page.h"
 #include "qemu/rcu.h"
 
 #include "exec/hwaddr.h"
-- 
2.39.5

[PATCH v4 10/17] system/kvm: make kvm_flush_coalesced_mmio_buffer() accessible for common code

[Pierrick Bouvier]

This function is used by system/physmem.c will be turn into common code
in next commit.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 include/system/kvm.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/system/kvm.h b/include/system/kvm.h
index ab17c09a551..21da3b8b052 100644
--- a/include/system/kvm.h
+++ b/include/system/kvm.h
@@ -210,11 +210,11 @@ bool kvm_arm_supports_user_irq(void);
 int kvm_on_sigbus_vcpu(CPUState *cpu, int code, void *addr);
 int kvm_on_sigbus(int code, void *addr);
 
-#ifdef COMPILING_PER_TARGET
-#include "cpu.h"
-
 void kvm_flush_coalesced_mmio_buffer(void);
 
+#ifdef COMPILING_PER_TARGET
+#include "cpu.h"
+
 /**
  * kvm_update_guest_debug(): ensure KVM debug structures updated
  * @cs: the CPUState for this cpu
-- 
2.39.5

[PATCH v4 11/17] exec/ram_addr: call xen_hvm_modified_memory only if xen is enabled

[Pierrick Bouvier]

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 include/exec/ram_addr.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
index f5d574261a3..92e8708af76 100644
--- a/include/exec/ram_addr.h
+++ b/include/exec/ram_addr.h
@@ -339,7 +339,9 @@ static inline void cpu_physical_memory_set_dirty_range(ram_addr_t start,
         }
     }
 
-    xen_hvm_modified_memory(start, length);
+    if (xen_enabled()) {
+        xen_hvm_modified_memory(start, length);
+    }
 }
 
 #if !defined(_WIN32)
@@ -415,7 +417,9 @@ uint64_t cpu_physical_memory_set_dirty_lebitmap(unsigned long *bitmap,
             }
         }
 
-        xen_hvm_modified_memory(start, pages << TARGET_PAGE_BITS);
+        if (xen_enabled()) {
+            xen_hvm_modified_memory(start, pages << TARGET_PAGE_BITS);
+        }
     } else {
         uint8_t clients = tcg_enabled() ? DIRTY_CLIENTS_ALL : DIRTY_CLIENTS_NOCODE;
 
-- 
2.39.5

[PATCH v4 12/17] hw/xen: add stubs for various functions

[Pierrick Bouvier]

Those functions are used by system/physmem.c, and are called only if
xen is enabled (which happens only if CONFIG_XEN is not set).

So we can crash in case those are called.

Acked-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 hw/xen/xen_stubs.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++
 hw/xen/meson.build |  3 +++
 2 files changed, 59 insertions(+)
 create mode 100644 hw/xen/xen_stubs.c

diff --git a/hw/xen/xen_stubs.c b/hw/xen/xen_stubs.c
new file mode 100644
index 00000000000..19cee84bbb4
--- /dev/null
+++ b/hw/xen/xen_stubs.c
@@ -0,0 +1,56 @@
+/*
+ * Various stubs for xen functions
+ *
+ * Those functions are used only if xen_enabled(). This file is linked only if
+ * CONFIG_XEN is not set, so they should never be called.
+ *
+ * Copyright (c) 2025 Linaro, Ltd.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "system/xen.h"
+#include "system/xen-mapcache.h"
+
+void xen_hvm_modified_memory(ram_addr_t start, ram_addr_t length)
+{
+    g_assert_not_reached();
+}
+
+void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size,
+                   struct MemoryRegion *mr, Error **errp)
+{
+    g_assert_not_reached();
+}
+
+bool xen_mr_is_memory(MemoryRegion *mr)
+{
+    g_assert_not_reached();
+}
+
+void xen_invalidate_map_cache_entry(uint8_t *buffer)
+{
+    g_assert_not_reached();
+}
+
+void xen_invalidate_map_cache(void)
+{
+    g_assert_not_reached();
+}
+
+ram_addr_t xen_ram_addr_from_mapcache(void *ptr)
+{
+    g_assert_not_reached();
+}
+
+uint8_t *xen_map_cache(MemoryRegion *mr,
+                       hwaddr phys_addr,
+                       hwaddr size,
+                       ram_addr_t ram_addr_offset,
+                       uint8_t lock,
+                       bool dma,
+                       bool is_write)
+{
+    g_assert_not_reached();
+}
diff --git a/hw/xen/meson.build b/hw/xen/meson.build
index 4a486e36738..a1850e76988 100644
--- a/hw/xen/meson.build
+++ b/hw/xen/meson.build
@@ -9,6 +9,9 @@ system_ss.add(when: ['CONFIG_XEN_BUS'], if_true: files(
 
 system_ss.add(when: ['CONFIG_XEN', xen], if_true: files(
   'xen-operations.c',
+),
+if_false: files(
+  'xen_stubs.c',
 ))
 
 xen_specific_ss = ss.source_set()
-- 
2.39.5

Re: [PATCH v4 12/17] hw/xen: add stubs for various functions

[Anthony PERARD]

On Thu, Mar 13, 2025 at 09:38:58AM -0700, Pierrick Bouvier wrote:
> Those functions are used by system/physmem.c, and are called only if
> xen is enabled (which happens only if CONFIG_XEN is not set).

You mean, 's/is not set/is set/'?
> 
> So we can crash in case those are called.
> 
> Acked-by: Richard Henderson <richard.henderson@linaro.org>
> Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
> ---
> diff --git a/hw/xen/xen_stubs.c b/hw/xen/xen_stubs.c
> new file mode 100644
> index 00000000000..19cee84bbb4
> --- /dev/null
> +++ b/hw/xen/xen_stubs.c
> +
> +void xen_invalidate_map_cache(void)
> +{

Is this stub actually necessary? xen_invalidate_map_cache() doesn't
seems to be used outside of xen's code.

In anycase:
Acked-by: Anthony PERARD <anthony.perard@vates.tech>

Thanks,

-- 

Anthony Perard | Vates XCP-ng Developer

XCP-ng & Xen Orchestra - Vates solutions

web: https://vates.tech

Re: [PATCH v4 12/17] hw/xen: add stubs for various functions

[Pierrick Bouvier]

On 3/14/25 06:35, Anthony PERARD wrote:
> On Thu, Mar 13, 2025 at 09:38:58AM -0700, Pierrick Bouvier wrote:
>> Those functions are used by system/physmem.c, and are called only if
>> xen is enabled (which happens only if CONFIG_XEN is not set).
> 
> You mean, 's/is not set/is set/'?

Right, I'll update the comment.

>>
>> So we can crash in case those are called.
>>
>> Acked-by: Richard Henderson <richard.henderson@linaro.org>
>> Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
>> ---
>> diff --git a/hw/xen/xen_stubs.c b/hw/xen/xen_stubs.c
>> new file mode 100644
>> index 00000000000..19cee84bbb4
>> --- /dev/null
>> +++ b/hw/xen/xen_stubs.c
>> +
>> +void xen_invalidate_map_cache(void)
>> +{
> 
> Is this stub actually necessary? xen_invalidate_map_cache() doesn't
> seems to be used outside of xen's code.
>

You're right again, I added it by mistake.

> In anycase:
> Acked-by: Anthony PERARD <anthony.perard@vates.tech>
> 
> Thanks,
> 

[PATCH v4 13/17] system/physmem: compilation unit is now common to all targets

[Pierrick Bouvier]

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 system/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/system/meson.build b/system/meson.build
index eec07a94513..bd82ef132e7 100644
--- a/system/meson.build
+++ b/system/meson.build
@@ -3,7 +3,6 @@ specific_ss.add(when: 'CONFIG_SYSTEM_ONLY', if_true: [files(
   'ioport.c',
   'globals-target.c',
   'memory.c',
-  'physmem.c',
 )])
 
 system_ss.add(files(
@@ -16,6 +15,7 @@ system_ss.add(files(
   'dma-helpers.c',
   'globals.c',
   'memory_mapping.c',
+  'physmem.c',
   'qdev-monitor.c',
   'qtest.c',
   'rtc.c',
-- 
2.39.5

[PATCH v4 14/17] include/exec/memory: extract devend_big_endian from devend_memop

[Pierrick Bouvier]

we'll use it in system/memory.c.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 include/exec/memory.h | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/include/exec/memory.h b/include/exec/memory.h
index 069021ac3ff..70177304a92 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -3138,16 +3138,22 @@ address_space_write_cached(MemoryRegionCache *cache, hwaddr addr,
 MemTxResult address_space_set(AddressSpace *as, hwaddr addr,
                               uint8_t c, hwaddr len, MemTxAttrs attrs);
 
-/* enum device_endian to MemOp.  */
-static inline MemOp devend_memop(enum device_endian end)
+/* returns true if end is big endian. */
+static inline bool devend_big_endian(enum device_endian end)
 {
     QEMU_BUILD_BUG_ON(DEVICE_HOST_ENDIAN != DEVICE_LITTLE_ENDIAN &&
                       DEVICE_HOST_ENDIAN != DEVICE_BIG_ENDIAN);
 
-    bool big_endian = (end == DEVICE_NATIVE_ENDIAN
-                       ? target_words_bigendian()
-                       : end == DEVICE_BIG_ENDIAN);
-    return big_endian ? MO_BE : MO_LE;
+    if (end == DEVICE_NATIVE_ENDIAN) {
+        return target_words_bigendian();
+    }
+    return end == DEVICE_BIG_ENDIAN;
+}
+
+/* enum device_endian to MemOp.  */
+static inline MemOp devend_memop(enum device_endian end)
+{
+    return devend_big_endian(end) ? MO_BE : MO_LE;
 }
 
 /*
-- 
2.39.5

[PATCH v4 15/17] include/exec/memory: move devend functions to memory-internal.h

[Pierrick Bouvier]

Only system/physmem.c and system/memory.c use those functions, so we can
move then to internal header.

Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 include/exec/memory-internal.h | 19 +++++++++++++++++++
 include/exec/memory.h          | 18 ------------------
 2 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/include/exec/memory-internal.h b/include/exec/memory-internal.h
index b729f3b25ad..c75178a3d6b 100644
--- a/include/exec/memory-internal.h
+++ b/include/exec/memory-internal.h
@@ -43,5 +43,24 @@ void address_space_dispatch_free(AddressSpaceDispatch *d);
 
 void mtree_print_dispatch(struct AddressSpaceDispatch *d,
                           MemoryRegion *root);
+
+/* returns true if end is big endian. */
+static inline bool devend_big_endian(enum device_endian end)
+{
+    QEMU_BUILD_BUG_ON(DEVICE_HOST_ENDIAN != DEVICE_LITTLE_ENDIAN &&
+                      DEVICE_HOST_ENDIAN != DEVICE_BIG_ENDIAN);
+
+    if (end == DEVICE_NATIVE_ENDIAN) {
+        return target_words_bigendian();
+    }
+    return end == DEVICE_BIG_ENDIAN;
+}
+
+/* enum device_endian to MemOp.  */
+static inline MemOp devend_memop(enum device_endian end)
+{
+    return devend_big_endian(end) ? MO_BE : MO_LE;
+}
+
 #endif
 #endif
diff --git a/include/exec/memory.h b/include/exec/memory.h
index 70177304a92..a3bb0542bf6 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -3138,24 +3138,6 @@ address_space_write_cached(MemoryRegionCache *cache, hwaddr addr,
 MemTxResult address_space_set(AddressSpace *as, hwaddr addr,
                               uint8_t c, hwaddr len, MemTxAttrs attrs);
 
-/* returns true if end is big endian. */
-static inline bool devend_big_endian(enum device_endian end)
-{
-    QEMU_BUILD_BUG_ON(DEVICE_HOST_ENDIAN != DEVICE_LITTLE_ENDIAN &&
-                      DEVICE_HOST_ENDIAN != DEVICE_BIG_ENDIAN);
-
-    if (end == DEVICE_NATIVE_ENDIAN) {
-        return target_words_bigendian();
-    }
-    return end == DEVICE_BIG_ENDIAN;
-}
-
-/* enum device_endian to MemOp.  */
-static inline MemOp devend_memop(enum device_endian end)
-{
-    return devend_big_endian(end) ? MO_BE : MO_LE;
-}
-
 /*
  * Inhibit technologies that require discarding of pages in RAM blocks, e.g.,
  * to manage the actual amount of memory consumed by the VM (then, the memory
-- 
2.39.5

Re: [PATCH v4 15/17] include/exec/memory: move devend functions to memory-internal.h

[Richard Henderson]

On 3/13/25 09:39, Pierrick Bouvier wrote:
> Only system/physmem.c and system/memory.c use those functions, so we can
> move then to internal header.
> 
> Signed-off-by: Pierrick Bouvier<pierrick.bouvier@linaro.org>
> ---
>   include/exec/memory-internal.h | 19 +++++++++++++++++++
>   include/exec/memory.h          | 18 ------------------
>   2 files changed, 19 insertions(+), 18 deletions(-)

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

r~

[PATCH v4 16/17] system/memory: make compilation unit common

[Pierrick Bouvier]

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 system/memory.c    | 17 +++++------------
 system/meson.build |  2 +-
 2 files changed, 6 insertions(+), 13 deletions(-)

diff --git a/system/memory.c b/system/memory.c
index 4c829793a0a..eddd21a6cdb 100644
--- a/system/memory.c
+++ b/system/memory.c
@@ -353,15 +353,6 @@ static void flatview_simplify(FlatView *view)
     }
 }
 
-static bool memory_region_big_endian(MemoryRegion *mr)
-{
-#if TARGET_BIG_ENDIAN
-    return mr->ops->endianness != DEVICE_LITTLE_ENDIAN;
-#else
-    return mr->ops->endianness == DEVICE_BIG_ENDIAN;
-#endif
-}
-
 static void adjust_endianness(MemoryRegion *mr, uint64_t *data, MemOp op)
 {
     if ((op & MO_BSWAP) != devend_memop(mr->ops->endianness)) {
@@ -563,7 +554,7 @@ static MemTxResult access_with_adjusted_size(hwaddr addr,
     /* FIXME: support unaligned access? */
     access_size = MAX(MIN(size, access_size_max), access_size_min);
     access_mask = MAKE_64BIT_MASK(0, access_size * 8);
-    if (memory_region_big_endian(mr)) {
+    if (devend_big_endian(mr->ops->endianness)) {
         for (i = 0; i < size; i += access_size) {
             r |= access_fn(mr, addr + i, value, access_size,
                         (size - access_size - i) * 8, access_mask, attrs);
@@ -2584,7 +2575,8 @@ void memory_region_add_eventfd(MemoryRegion *mr,
     unsigned i;
 
     if (size) {
-        adjust_endianness(mr, &mrfd.data, size_memop(size) | MO_TE);
+        MemOp mop = (target_words_bigendian() ? MO_BE : MO_LE) | size_memop(size);
+        adjust_endianness(mr, &mrfd.data, mop);
     }
     memory_region_transaction_begin();
     for (i = 0; i < mr->ioeventfd_nb; ++i) {
@@ -2619,7 +2611,8 @@ void memory_region_del_eventfd(MemoryRegion *mr,
     unsigned i;
 
     if (size) {
-        adjust_endianness(mr, &mrfd.data, size_memop(size) | MO_TE);
+        MemOp mop = (target_words_bigendian() ? MO_BE : MO_LE) | size_memop(size);
+        adjust_endianness(mr, &mrfd.data, mop);
     }
     memory_region_transaction_begin();
     for (i = 0; i < mr->ioeventfd_nb; ++i) {
diff --git a/system/meson.build b/system/meson.build
index bd82ef132e7..4f44b78df31 100644
--- a/system/meson.build
+++ b/system/meson.build
@@ -2,7 +2,6 @@ specific_ss.add(when: 'CONFIG_SYSTEM_ONLY', if_true: [files(
   'arch_init.c',
   'ioport.c',
   'globals-target.c',
-  'memory.c',
 )])
 
 system_ss.add(files(
@@ -15,6 +14,7 @@ system_ss.add(files(
   'dma-helpers.c',
   'globals.c',
   'memory_mapping.c',
+  'memory.c',
   'physmem.c',
   'qdev-monitor.c',
   'qtest.c',
-- 
2.39.5

[PATCH v4 17/17] system/ioport: make compilation unit common

[Pierrick Bouvier]

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 system/ioport.c    | 1 -
 system/meson.build | 2 +-
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/system/ioport.c b/system/ioport.c
index 55c2a752396..89daae9d602 100644
--- a/system/ioport.c
+++ b/system/ioport.c
@@ -26,7 +26,6 @@
  */
 
 #include "qemu/osdep.h"
-#include "cpu.h"
 #include "exec/ioport.h"
 #include "exec/memory.h"
 #include "exec/address-spaces.h"
diff --git a/system/meson.build b/system/meson.build
index 4f44b78df31..063301c3ad0 100644
--- a/system/meson.build
+++ b/system/meson.build
@@ -1,6 +1,5 @@
 specific_ss.add(when: 'CONFIG_SYSTEM_ONLY', if_true: [files(
   'arch_init.c',
-  'ioport.c',
   'globals-target.c',
 )])
 
@@ -13,6 +12,7 @@ system_ss.add(files(
   'dirtylimit.c',
   'dma-helpers.c',
   'globals.c',
+  'ioport.c',
   'memory_mapping.c',
   'memory.c',
   'physmem.c',
-- 
2.39.5

Re: [PATCH v4 00/17] make system memory API available for common code

[Pierrick Bouvier]

Hi,

patch 12 (adding xen stubs, so would need someone from hw/xen) and 15 
are missing reviews.

Thanks,
Pierrick

On 3/13/25 09:38, Pierrick Bouvier wrote:
> The main goal of this series is to be able to call any memory ld/st function
> from code that is *not* target dependent. As a positive side effect, we can
> turn related system compilation units into common code.
> 
> The first 5 patches remove dependency of memory API to cpu headers and remove
> dependency to target specific code. This could be a series on its own, but it's
> great to be able to turn system memory compilation units into common code to
> make sure it can't regress, and prove it achieves the desired result.
> 
> The next patches remove more dependencies on cpu headers (exec-all,
> memory-internal, ram_addr).
> Then, we add access to a needed function from kvm, some xen stubs, and we
> finally can turn our compilation units into common code.
> 
> Every commit was tested to build correctly for all targets (on windows, linux,
> macos), and the series was fully tested by running all tests we have (linux,
> x86_64 host).
> 
> v2:
> - reorder first commits (tswap change first, so memory cached functions can use it)
> - move st/ld*_p functions to tswap instead of bswap
> - add define for target_words_bigendian when COMPILING_PER_TARGET, equals to
>    TARGET_BIG_ENDIAN (avoid overhead in target code)
> - rewrite devend_memop
> - remove useless exec-all.h in concerned patch
> - extract devend_big_endian function to reuse in system/memory.c
> - rewrite changes to system/memory.c
> 
> v3:
> - move devend functions to memory_internal.h
> - completed description for commits removing cpu.h dependency
> 
> v4:
> - rebase on top of master
>    * missing include in 'codebase: prepare to remove cpu.h from exec/exec-all.h'
>    * meson build conflict
> 
> Pierrick Bouvier (17):
>    exec/tswap: target code can use TARGET_BIG_ENDIAN instead of
>      target_words_bigendian()
>    exec/tswap: implement {ld,st}.*_p as functions instead of macros
>    exec/memory_ldst: extract memory_ldst declarations from cpu-all.h
>    exec/memory_ldst_phys: extract memory_ldst_phys declarations from
>      cpu-all.h
>    exec/memory.h: make devend_memop "target defines" agnostic
>    codebase: prepare to remove cpu.h from exec/exec-all.h
>    exec/exec-all: remove dependency on cpu.h
>    exec/memory-internal: remove dependency on cpu.h
>    exec/ram_addr: remove dependency on cpu.h
>    system/kvm: make kvm_flush_coalesced_mmio_buffer() accessible for
>      common code
>    exec/ram_addr: call xen_hvm_modified_memory only if xen is enabled
>    hw/xen: add stubs for various functions
>    system/physmem: compilation unit is now common to all targets
>    include/exec/memory: extract devend_big_endian from devend_memop
>    include/exec/memory: move devend functions to memory-internal.h
>    system/memory: make compilation unit common
>    system/ioport: make compilation unit common
> 
>   include/exec/cpu-all.h              | 66 -----------------------
>   include/exec/exec-all.h             |  1 -
>   include/exec/memory-internal.h      | 21 +++++++-
>   include/exec/memory.h               | 30 ++++-------
>   include/exec/ram_addr.h             | 11 ++--
>   include/exec/tswap.h                | 81 +++++++++++++++++++++++++++--
>   include/system/kvm.h                |  6 +--
>   include/tcg/tcg-op.h                |  1 +
>   target/ppc/helper_regs.h            |  2 +
>   include/exec/memory_ldst.h.inc      |  4 --
>   include/exec/memory_ldst_phys.h.inc |  5 +-
>   cpu-target.c                        |  1 +
>   hw/ppc/spapr_nested.c               |  1 +
>   hw/sh4/sh7750.c                     |  1 +
>   hw/xen/xen_stubs.c                  | 56 ++++++++++++++++++++
>   page-vary-target.c                  |  2 +-
>   system/ioport.c                     |  1 -
>   system/memory.c                     | 17 ++----
>   target/ppc/tcg-excp_helper.c        |  1 +
>   target/riscv/bitmanip_helper.c      |  2 +-
>   hw/xen/meson.build                  |  3 ++
>   system/meson.build                  |  6 +--
>   22 files changed, 193 insertions(+), 126 deletions(-)
>   create mode 100644 hw/xen/xen_stubs.c
>