Re: [RFC v3 14/18] backends/iommufd: Introduce the iommufd object

[Nicolin Chen]

Hi Eric,

On Tue, Jan 31, 2023 at 09:53:01PM +0100, Eric Auger wrote:

> diff --git a/include/sysemu/iommufd.h b/include/sysemu/iommufd.h
> new file mode 100644
> index 0000000000..06a866d1bd
> --- /dev/null
> +++ b/include/sysemu/iommufd.h
> @@ -0,0 +1,47 @@
> +#ifndef SYSEMU_IOMMUFD_H
> +#define SYSEMU_IOMMUFD_H
> +
> +#include "qom/object.h"
> +#include "qemu/thread.h"
> +#include "exec/hwaddr.h"
> +#include "exec/ram_addr.h"

After rebasing nesting patches on top of this, I see a build error:

====================================================================
[47/876] Compiling C object libcommon.fa.p/hw_arm_smmu-common.c.o
FAILED: libcommon.fa.p/hw_arm_smmu-common.c.o 
cc -Ilibcommon.fa.p -I../src/3rdparty/qemu/dtc/libfdt -I/usr/include/pixman-1 
-I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glib-2.0 
-I/usr/lib/aarch64-linux-gnu/glib-2.0/include -I/usr/include/gio-unix-2.0 
-fdiagnostics-color=auto -Wall -Winvalid-pch -std=gnu11 -O2 -g -isystem 
/src/3rdparty/qemu/linux-headers -isystem linux-headers -iquote . -iquote 
/src/3rdparty/qemu -iquote /src/3rdparty/qemu/include -iquote 
/src/3rdparty/qemu/tcg/aarch64 -pthread -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 
-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -fno-strict-aliasing 
-fno-common -fwrapv -Wundef -Wwrite-strings -Wmissing-prototypes 
-Wstrict-prototypes -Wredundant-decls -Wold-style-declaration 
-Wold-style-definition -Wtype-limits -Wformat-security -Wformat-y2k -Winit-self 
-Wignored-qualifiers -Wempty-body -Wnested-externs -Wendif-labels 
-Wexpansion-to-defined -Wimplicit-fallthrough=2 -Wmissing-format-attribute 
-Wno-missing-include-dirs -Wno-shift-negative-value -Wno-psabi 
-fstack-protector-strong -fPIE -MD -MQ libcommon.fa.p/hw_arm_smmu-common.c.o 
-MF libcommon.fa.p/hw_arm_smmu-common.c.o.d -o 
libcommon.fa.p/hw_arm_smmu-common.c.o -c 
../src/3rdparty/qemu/hw/arm/smmu-common.c
In file included from /src/3rdparty/qemu/include/sysemu/iommufd.h:7,
                 from ../src/3rdparty/qemu/hw/arm/smmu-common.c:29:
/src/3rdparty/qemu/include/exec/ram_addr.h:23:10: fatal error: cpu.h: No such 
file or directory
   23 | #include "cpu.h"
      |          ^~~~~~~
compilation terminated.
====================================================================

I guess it's resulted from the module inter-dependency. Though our
nesting patches aren't finalized yet, the possibility of including
iommufd.h is still there. Meanwhile, the ram_addr.h here is added
for "ram_addr_t" type, I think. So, could we include "cpu-common.h"
instead, where the "ram_addr_t" type is actually defined?

The build error is gone after this replacement:
====================================================================
diff --git a/include/sysemu/iommufd.h b/include/sysemu/iommufd.h
index 45540de63986..86d370c221b3 100644
--- a/include/sysemu/iommufd.h
+++ b/include/sysemu/iommufd.h
@@ -4,7 +4,7 @@
 #include "qom/object.h"
 #include "qemu/thread.h"
 #include "exec/hwaddr.h"
-#include "exec/ram_addr.h"
+#include "exec/cpu-common.h"
 #include <linux/iommufd.h>
 
 #define TYPE_IOMMUFD_BACKEND "iommufd"
====================================================================

Thanks
Nic