Re: [PATCH 1/2] Fix libvhost-user.c compilation.

[Paolo Bonzini <pbonzini@redhat.com>]

On 4/7/23 09:56, Michael S. Tsirkin wrote:
> On Wed, Apr 05, 2023 at 02:59:19PM +0200, David 'Digit' Turner wrote:
>> The source file uses VIRTIO_F_VERSION_1 which is
>> not defined by <linux/virtio_config.h> on Debian 10.
>>
>> The system-provided <linux/virtio_config.h> which
>> does not include the macro definition is included
>> through <linux/vhost.h>, so fix the issue by including
>> the standard-headers version before that.
>>
>> Signed-off-by: David 'Digit' Turner <digit@google.com>
> 
> I don't get it. ./linux-headers/linux/vhost.h does not seem
> to use <linux/virtio_config.h> for me.

The issue is that subprojects/libvhost-user/libvhost-user.c includes 
linux/vhost.h.  Probably should be changed to 
linux-headers/linux/vhost.h, but David's patch makes sense because 
libvhost-user.c does use a symbol from virtio_config.h.

Paolo

> $ git grep linux/virtio_config.h
> include/hw/virtio/virtio.h:#include "standard-headers/linux/virtio_config.h"
> include/standard-headers/linux/vhost_types.h:#include "standard-headers/linux/virtio_config.h"
> include/standard-headers/linux/virtio_9p.h:#include "standard-headers/linux/virtio_config.h"
> include/standard-headers/linux/virtio_balloon.h:#include "standard-headers/linux/virtio_config.h"
> include/standard-headers/linux/virtio_blk.h:#include "standard-headers/linux/virtio_config.h"
> include/standard-headers/linux/virtio_console.h:#include "standard-headers/linux/virtio_config.h"
> include/standard-headers/linux/virtio_crypto.h:#include "standard-headers/linux/virtio_config.h"
> include/standard-headers/linux/virtio_fs.h:#include "standard-headers/linux/virtio_config.h"
> include/standard-headers/linux/virtio_mem.h:#include "standard-headers/linux/virtio_config.h"
> include/standard-headers/linux/virtio_net.h:#include "standard-headers/linux/virtio_config.h"
> include/standard-headers/linux/virtio_pmem.h:#include "standard-headers/linux/virtio_config.h"
> include/standard-headers/linux/virtio_rng.h:#include "standard-headers/linux/virtio_config.h"
> include/standard-headers/linux/virtio_vsock.h:#include "standard-headers/linux/virtio_config.h"
> linux-headers/linux/virtio_config.h:#include "standard-headers/linux/virtio_config.h"
> scripts/update-linux-headers.sh:cat <<EOF >$output/linux-headers/linux/virtio_config.h
> scripts/update-linux-headers.sh:#include "standard-headers/linux/virtio_config.h"
> subprojects/libvduse/libvduse.c:#include "linux-headers/linux/virtio_config.h"
> tests/qtest/fuzz/virtio_net_fuzz.c:#include "standard-headers/linux/virtio_config.h"
> tests/qtest/libqos/virtio-gpio.c:#include "standard-headers/linux/virtio_config.h"
> tests/qtest/libqos/virtio-pci-modern.c:#include "standard-headers/linux/virtio_config.h"
> tests/qtest/libqos/virtio.c:#include "standard-headers/linux/virtio_config.h"
> 
> 
> 
> 
>> ---
>>   subprojects/libvhost-user/libvhost-user.c | 6 ++++++
>>   1 file changed, 6 insertions(+)
>>
>> diff --git a/subprojects/libvhost-user/libvhost-user.c b/subprojects/libvhost-user/libvhost-user.c
>> index 0200b78e8e..0a5768cb55 100644
>> --- a/subprojects/libvhost-user/libvhost-user.c
>> +++ b/subprojects/libvhost-user/libvhost-user.c
>> @@ -32,6 +32,12 @@
>>   #include <sys/mman.h>
>>   #include <endian.h>
>>   
>> +/* Necessary to provide VIRTIO_F_VERSION_1 on system
>> + * with older linux headers. Must appear before
>> + * <linux/vhost.h> below.
>> + */
>> +#include "standard-headers/linux/virtio_config.h"
>> +
>>   #if defined(__linux__)
>>   #include <sys/syscall.h>
>>   #include <fcntl.h>
>> -- 
>> 2.40.0.348.gf938b09366-goog
> 
>