[Qemu-devel] [PATCH v2 0/2] fsdev/virtfs: Assorted cleanups and fixes

[Qemu-devel] [PATCH v2 0/2] fsdev/virtfs: Assorted cleanups and fixes

[Greg Kurz]

I've already applied patches from v1 with r-b tags to 9p-next. Please find
updated versions of the -virtfs_synth deprecation and the documentation
patches.

--
Greg

---

Greg Kurz (2):
      vl: Deprecate -virtfs_synth
      virtfs: Fix documentation of -fsdev and -virtfs


 qemu-deprecated.texi |    5 +++
 qemu-options.hx      |   96 +++++++++++++++++++++++++++++++++++---------------
 vl.c                 |    4 ++
 3 files changed, 77 insertions(+), 28 deletions(-)

[Qemu-devel] [PATCH v2 1/2] vl: Deprecate -virtfs_synth

[Greg Kurz]

The synth fsdriver never got used for anything else but the QTest
testcase for VirtIO 9P. And even there, QTest uses -fsdev synth and
-device virtio-9p-... directly.

Signed-off-by: Greg Kurz <groug@kaod.org>
---
v2: - change "no replacement" to "use '-fsdev synth' instead"
---
 qemu-deprecated.texi |    5 +++++
 qemu-options.hx      |    3 ++-
 vl.c                 |    4 ++++
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi
index 842e71b11dcc..1a821b68f435 100644
--- a/qemu-deprecated.texi
+++ b/qemu-deprecated.texi
@@ -72,6 +72,11 @@ backend settings instead of environment variables.  To ease migration to
 the new format, the ``-audiodev-help'' option can be used to convert
 the current values of the environment variables to ``-audiodev'' options.
 
+@subsection -virtfs_synth (since 4.1)
+
+The ``-virtfs_synth'' argument is now deprecated. Please use ``-fsdev synth''
+and ``-device virtio-9p-...'' instead.
+
 @section QEMU Machine Protocol (QMP) commands
 
 @subsection block-dirty-bitmap-add "autoload" parameter (since 2.12.0)
diff --git a/qemu-options.hx b/qemu-options.hx
index 51802cbb266a..03c50ba0f0b2 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1368,7 +1368,8 @@ DEF("virtfs_synth", 0, QEMU_OPTION_virtfs_synth,
 STEXI
 @item -virtfs_synth
 @findex -virtfs_synth
-Create synthetic file system image
+Create synthetic file system image. Note that this option is now deprecated.
+Please use @code{-fsdev synth} and @code{-device virtio-9p-...} instead.
 ETEXI
 
 DEF("iscsi", HAS_ARG, QEMU_OPTION_iscsi,
diff --git a/vl.c b/vl.c
index b6709514c1bb..8456f006edbd 100644
--- a/vl.c
+++ b/vl.c
@@ -3535,6 +3535,10 @@ int main(int argc, char **argv, char **envp)
                 QemuOpts *fsdev;
                 QemuOpts *device;
 
+                warn_report("'-virtfs_synth' is deprecated, please use "
+                             "'-fsdev synth' and '-device virtio-9p-...' "
+                            "instead");
+
                 fsdev = qemu_opts_create(qemu_find_opts("fsdev"), "v_synth",
                                          1, NULL);
                 if (!fsdev) {

Re: [Qemu-devel] [PATCH v2 1/2] vl: Deprecate -virtfs_synth

[Thomas Huth]

On 13/05/2019 12.34, Greg Kurz wrote:
> The synth fsdriver never got used for anything else but the QTest
> testcase for VirtIO 9P. And even there, QTest uses -fsdev synth and
> -device virtio-9p-... directly.
> 
> Signed-off-by: Greg Kurz <groug@kaod.org>
> ---
> v2: - change "no replacement" to "use '-fsdev synth' instead"
> ---
>  qemu-deprecated.texi |    5 +++++
>  qemu-options.hx      |    3 ++-
>  vl.c                 |    4 ++++
>  3 files changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi
> index 842e71b11dcc..1a821b68f435 100644
> --- a/qemu-deprecated.texi
> +++ b/qemu-deprecated.texi
> @@ -72,6 +72,11 @@ backend settings instead of environment variables.  To ease migration to
>  the new format, the ``-audiodev-help'' option can be used to convert
>  the current values of the environment variables to ``-audiodev'' options.
>  
> +@subsection -virtfs_synth (since 4.1)
> +
> +The ``-virtfs_synth'' argument is now deprecated. Please use ``-fsdev synth''
> +and ``-device virtio-9p-...'' instead.
> +
>  @section QEMU Machine Protocol (QMP) commands
>  
>  @subsection block-dirty-bitmap-add "autoload" parameter (since 2.12.0)
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 51802cbb266a..03c50ba0f0b2 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -1368,7 +1368,8 @@ DEF("virtfs_synth", 0, QEMU_OPTION_virtfs_synth,
>  STEXI
>  @item -virtfs_synth
>  @findex -virtfs_synth
> -Create synthetic file system image
> +Create synthetic file system image. Note that this option is now deprecated.
> +Please use @code{-fsdev synth} and @code{-device virtio-9p-...} instead.
>  ETEXI
>  
>  DEF("iscsi", HAS_ARG, QEMU_OPTION_iscsi,
> diff --git a/vl.c b/vl.c
> index b6709514c1bb..8456f006edbd 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -3535,6 +3535,10 @@ int main(int argc, char **argv, char **envp)
>                  QemuOpts *fsdev;
>                  QemuOpts *device;
>  
> +                warn_report("'-virtfs_synth' is deprecated, please use "
> +                             "'-fsdev synth' and '-device virtio-9p-...' "
> +                            "instead");
> +
>                  fsdev = qemu_opts_create(qemu_find_opts("fsdev"), "v_synth",
>                                           1, NULL);
>                  if (!fsdev) {
> 

Reviewed-by: Thomas Huth <thuth@redhat.com>

[Qemu-devel] [PATCH v2 2/2] virtfs: Fix documentation of -fsdev and -virtfs

[Greg Kurz]

This fixes several things:
- add "id" description to -virtfs documentation
- split the description into several lines in both usage and documentation
  for accurateness and clarity
- add documentation and usage of the synth fsdriver
- add "throttling.*" description to -fsdev local
- add some missing periods
- add proper reference to the virtfs-proxy-helper(1) manual page
- document that the virtio device may be either virtio-9p-pci, virtio-9p-ccw
  or virtio-9p-device, depending on the machine type

Buglink: https://bugs.launchpad.net/qemu/+bug/1581976
Signed-off-by: Greg Kurz <groug@kaod.org>
---
v2: - mention virtfs-proxy-helper(1) change in the changelog
    - mention virtio-9p-ccw and virtio-9p-device
---
 qemu-options.hx |   93 +++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 66 insertions(+), 27 deletions(-)

diff --git a/qemu-options.hx b/qemu-options.hx
index 03c50ba0f0b2..fa705b63b157 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1232,26 +1232,35 @@ the write back by pressing @key{C-a s} (@pxref{disk_images}).
 ETEXI
 
 DEF("fsdev", HAS_ARG, QEMU_OPTION_fsdev,
-    "-fsdev fsdriver,id=id[,path=path,][security_model={mapped-xattr|mapped-file|passthrough|none}]\n"
-    " [,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd][,fmode=fmode][,dmode=dmode]\n"
+    "-fsdev local,id=id,path=path,security_model=mapped-xattr|mapped-file|passthrough|none\n"
+    " [,writeout=immediate][,readonly][,fmode=fmode][,dmode=dmode]\n"
     " [[,throttling.bps-total=b]|[[,throttling.bps-read=r][,throttling.bps-write=w]]]\n"
     " [[,throttling.iops-total=i]|[[,throttling.iops-read=r][,throttling.iops-write=w]]]\n"
     " [[,throttling.bps-total-max=bm]|[[,throttling.bps-read-max=rm][,throttling.bps-write-max=wm]]]\n"
     " [[,throttling.iops-total-max=im]|[[,throttling.iops-read-max=irm][,throttling.iops-write-max=iwm]]]\n"
-    " [[,throttling.iops-size=is]]\n",
+    " [[,throttling.iops-size=is]]\n"
+    "-fsdev proxy,id=id,socket=socket[,writeout=immediate][,readonly]\n"
+    "-fsdev proxy,id=id,sock_fd=sock_fd[,writeout=immediate][,readonly]\n"
+    "-fsdev synth,id=id\n",
     QEMU_ARCH_ALL)
 
 STEXI
 
-@item -fsdev @var{fsdriver},id=@var{id},path=@var{path},[security_model=@var{security_model}][,writeout=@var{writeout}][,readonly][,socket=@var{socket}|sock_fd=@var{sock_fd}][,fmode=@var{fmode}][,dmode=@var{dmode}]
+@item -fsdev local,id=@var{id},path=@var{path},security_model=@var{security_model} [,writeout=@var{writeout}][,readonly][,fmode=@var{fmode}][,dmode=@var{dmode}] [,throttling.@var{option}=@var{value}[,throttling.@var{option}=@var{value}[,...]]]
+@itemx -fsdev proxy,id=@var{id},socket=@var{socket}[,writeout=@var{writeout}][,readonly]
+@itemx -fsdev proxy,id=@var{id},sock_fd=@var{sock_fd}[,writeout=@var{writeout}][,readonly]
+@itemx -fsdev synth,id=@var{id}[,readonly]
 @findex -fsdev
 Define a new file system device. Valid options are:
 @table @option
-@item @var{fsdriver}
-This option specifies the fs driver backend to use.
-Currently "local" and "proxy" file system drivers are supported.
+@item local
+Accesses to the filesystem are done by QEMU.
+@item proxy
+Accesses to the filesystem are done by virtfs-proxy-helper(1).
+@item synth
+Synthetic filesystem, only used by QTests.
 @item id=@var{id}
-Specifies identifier for this device
+Specifies identifier for this device.
 @item path=@var{path}
 Specifies the export path for the file system device. Files under
 this path will be available to the 9p client on the guest.
@@ -1279,48 +1288,76 @@ Enables exporting 9p share as a readonly mount for guests. By default
 read-write access is given.
 @item socket=@var{socket}
 Enables proxy filesystem driver to use passed socket file for communicating
-with virtfs-proxy-helper
+with virtfs-proxy-helper(1).
 @item sock_fd=@var{sock_fd}
 Enables proxy filesystem driver to use passed socket descriptor for
-communicating with virtfs-proxy-helper. Usually a helper like libvirt
-will create socketpair and pass one of the fds as sock_fd
+communicating with virtfs-proxy-helper(1). Usually a helper like libvirt
+will create socketpair and pass one of the fds as sock_fd.
 @item fmode=@var{fmode}
 Specifies the default mode for newly created files on the host. Works only
 with security models "mapped-xattr" and "mapped-file".
 @item dmode=@var{dmode}
 Specifies the default mode for newly created directories on the host. Works
 only with security models "mapped-xattr" and "mapped-file".
+@item throttling.bps-total=@var{b},throttling.bps-read=@var{r},throttling.bps-write=@var{w}
+Specify bandwidth throttling limits in bytes per second, either for all request
+types or for reads or writes only.
+@item throttling.bps-total-max=@var{bm},bps-read-max=@var{rm},bps-write-max=@var{wm}
+Specify bursts in bytes per second, either for all request types or for reads
+or writes only.  Bursts allow the guest I/O to spike above the limit
+temporarily.
+@item throttling.iops-total=@var{i},throttling.iops-read=@var{r}, throttling.iops-write=@var{w}
+Specify request rate limits in requests per second, either for all request
+types or for reads or writes only.
+@item throttling.iops-total-max=@var{im},throttling.iops-read-max=@var{irm}, throttling.iops-write-max=@var{iwm}
+Specify bursts in requests per second, either for all request types or for reads
+or writes only.  Bursts allow the guest I/O to spike above the limit temporarily.
+@item throttling.iops-size=@var{is}
+Let every @var{is} bytes of a request count as a new request for iops
+throttling purposes.
 @end table
 
--fsdev option is used along with -device driver "virtio-9p-pci".
-@item -device virtio-9p-pci,fsdev=@var{id},mount_tag=@var{mount_tag}
-Options for virtio-9p-pci driver are:
+-fsdev option is used along with -device driver "virtio-9p-...".
+@item -device virtio-9p-@var{type},fsdev=@var{id},mount_tag=@var{mount_tag}
+Options for virtio-9p-... driver are:
 @table @option
+@item @var{type}
+Specifies the variant to be used. Supported values are "pci", "ccw" or "device",
+depending on the machine type.
 @item fsdev=@var{id}
-Specifies the id value specified along with -fsdev option
+Specifies the id value specified along with -fsdev option.
 @item mount_tag=@var{mount_tag}
-Specifies the tag name to be used by the guest to mount this export point
+Specifies the tag name to be used by the guest to mount this export point.
 @end table
 
 ETEXI
 
 DEF("virtfs", HAS_ARG, QEMU_OPTION_virtfs,
-    "-virtfs local,path=path,mount_tag=tag,security_model=[mapped-xattr|mapped-file|passthrough|none]\n"
-    "        [,id=id][,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd][,fmode=fmode][,dmode=dmode]\n",
+    "-virtfs local,path=path,mount_tag=tag,security_model=mapped-xattr|mapped-file|passthrough|none\n"
+    "        [,id=id][,writeout=immediate][,readonly][,fmode=fmode][,dmode=dmode]\n"
+    "-virtfs proxy,mount_tag=tag,socket=socket[,id=id][,writeout=immediate][,readonly]\n"
+    "-virtfs proxy,mount_tag=tag,sock_fd=sock_fd[,id=id][,writeout=immediate][,readonly]\n"
+    "-virtfs synth,mount_tag=tag[,id=id][,readonly]\n",
     QEMU_ARCH_ALL)
 
 STEXI
 
-@item -virtfs @var{fsdriver}[,path=@var{path}],mount_tag=@var{mount_tag}[,security_model=@var{security_model}][,writeout=@var{writeout}][,readonly][,socket=@var{socket}|sock_fd=@var{sock_fd}][,fmode=@var{fmode}][,dmode=@var{dmode}]
+@item -virtfs local,path=@var{path},mount_tag=@var{mount_tag} ,security_model=@var{security_model}[,writeout=@var{writeout}][,readonly] [,fmode=@var{fmode}][,dmode=@var{dmode}]
+@itemx -virtfs proxy,socket=@var{socket},mount_tag=@var{mount_tag} [,writeout=@var{writeout}][,readonly]
+@itemx -virtfs proxy,sock_fd=@var{sock_fd},mount_tag=@var{mount_tag} [,writeout=@var{writeout}][,readonly]
+@itemx -virtfs synth,mount_tag=@var{mount_tag}
 @findex -virtfs
 
-The general form of a Virtual File system pass-through options are:
+Define a new filesystem device and expose it to the guest using a virtio-9p-device. The general form of a Virtual File system pass-through options are:
 @table @option
-@item @var{fsdriver}
-This option specifies the fs driver backend to use.
-Currently "local" and "proxy" file system drivers are supported.
+@item local
+Accesses to the filesystem are done by QEMU.
+@item proxy
+Accesses to the filesystem are done by virtfs-proxy-helper(1).
+@item synth
+Synthetic filesystem, only used by QTests.
 @item id=@var{id}
-Specifies identifier for this device
+Specifies identifier for the filesystem device
 @item path=@var{path}
 Specifies the export path for the file system device. Files under
 this path will be available to the 9p client on the guest.
@@ -1348,17 +1385,19 @@ Enables exporting 9p share as a readonly mount for guests. By default
 read-write access is given.
 @item socket=@var{socket}
 Enables proxy filesystem driver to use passed socket file for
-communicating with virtfs-proxy-helper. Usually a helper like libvirt
-will create socketpair and pass one of the fds as sock_fd
+communicating with virtfs-proxy-helper(1). Usually a helper like libvirt
+will create socketpair and pass one of the fds as sock_fd.
 @item sock_fd
 Enables proxy filesystem driver to use passed 'sock_fd' as the socket
-descriptor for interfacing with virtfs-proxy-helper
+descriptor for interfacing with virtfs-proxy-helper(1).
 @item fmode=@var{fmode}
 Specifies the default mode for newly created files on the host. Works only
 with security models "mapped-xattr" and "mapped-file".
 @item dmode=@var{dmode}
 Specifies the default mode for newly created directories on the host. Works
 only with security models "mapped-xattr" and "mapped-file".
+@item mount_tag=@var{mount_tag}
+Specifies the tag name to be used by the guest to mount this export point.
 @end table
 ETEXI
 

Re: [Qemu-devel] [PATCH v2 2/2] virtfs: Fix documentation of -fsdev and -virtfs

[Greg Kurz]

On Mon, 13 May 2019 12:34:10 +0200
Greg Kurz <groug@kaod.org> wrote:

> This fixes several things:
> - add "id" description to -virtfs documentation
> - split the description into several lines in both usage and documentation
>   for accurateness and clarity
> - add documentation and usage of the synth fsdriver
> - add "throttling.*" description to -fsdev local
> - add some missing periods
> - add proper reference to the virtfs-proxy-helper(1) manual page
> - document that the virtio device may be either virtio-9p-pci, virtio-9p-ccw
>   or virtio-9p-device, depending on the machine type
> 
> Buglink: https://bugs.launchpad.net/qemu/+bug/1581976
> Signed-off-by: Greg Kurz <groug@kaod.org>
> ---
> v2: - mention virtfs-proxy-helper(1) change in the changelog
>     - mention virtio-9p-ccw and virtio-9p-device
> ---

Thomas,

Unless you (or anyone else) have some objections, I intend to apply this patch
and issue a pull request in a near future.

Cheers,

--
Greg

>  qemu-options.hx |   93 +++++++++++++++++++++++++++++++++++++++----------------
>  1 file changed, 66 insertions(+), 27 deletions(-)
> 
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 03c50ba0f0b2..fa705b63b157 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -1232,26 +1232,35 @@ the write back by pressing @key{C-a s} (@pxref{disk_images}).
>  ETEXI
>  
>  DEF("fsdev", HAS_ARG, QEMU_OPTION_fsdev,
> -    "-fsdev fsdriver,id=id[,path=path,][security_model={mapped-xattr|mapped-file|passthrough|none}]\n"
> -    " [,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd][,fmode=fmode][,dmode=dmode]\n"
> +    "-fsdev local,id=id,path=path,security_model=mapped-xattr|mapped-file|passthrough|none\n"
> +    " [,writeout=immediate][,readonly][,fmode=fmode][,dmode=dmode]\n"
>      " [[,throttling.bps-total=b]|[[,throttling.bps-read=r][,throttling.bps-write=w]]]\n"
>      " [[,throttling.iops-total=i]|[[,throttling.iops-read=r][,throttling.iops-write=w]]]\n"
>      " [[,throttling.bps-total-max=bm]|[[,throttling.bps-read-max=rm][,throttling.bps-write-max=wm]]]\n"
>      " [[,throttling.iops-total-max=im]|[[,throttling.iops-read-max=irm][,throttling.iops-write-max=iwm]]]\n"
> -    " [[,throttling.iops-size=is]]\n",
> +    " [[,throttling.iops-size=is]]\n"
> +    "-fsdev proxy,id=id,socket=socket[,writeout=immediate][,readonly]\n"
> +    "-fsdev proxy,id=id,sock_fd=sock_fd[,writeout=immediate][,readonly]\n"
> +    "-fsdev synth,id=id\n",
>      QEMU_ARCH_ALL)
>  
>  STEXI
>  
> -@item -fsdev @var{fsdriver},id=@var{id},path=@var{path},[security_model=@var{security_model}][,writeout=@var{writeout}][,readonly][,socket=@var{socket}|sock_fd=@var{sock_fd}][,fmode=@var{fmode}][,dmode=@var{dmode}]
> +@item -fsdev local,id=@var{id},path=@var{path},security_model=@var{security_model} [,writeout=@var{writeout}][,readonly][,fmode=@var{fmode}][,dmode=@var{dmode}] [,throttling.@var{option}=@var{value}[,throttling.@var{option}=@var{value}[,...]]]
> +@itemx -fsdev proxy,id=@var{id},socket=@var{socket}[,writeout=@var{writeout}][,readonly]
> +@itemx -fsdev proxy,id=@var{id},sock_fd=@var{sock_fd}[,writeout=@var{writeout}][,readonly]
> +@itemx -fsdev synth,id=@var{id}[,readonly]
>  @findex -fsdev
>  Define a new file system device. Valid options are:
>  @table @option
> -@item @var{fsdriver}
> -This option specifies the fs driver backend to use.
> -Currently "local" and "proxy" file system drivers are supported.
> +@item local
> +Accesses to the filesystem are done by QEMU.
> +@item proxy
> +Accesses to the filesystem are done by virtfs-proxy-helper(1).
> +@item synth
> +Synthetic filesystem, only used by QTests.
>  @item id=@var{id}
> -Specifies identifier for this device
> +Specifies identifier for this device.
>  @item path=@var{path}
>  Specifies the export path for the file system device. Files under
>  this path will be available to the 9p client on the guest.
> @@ -1279,48 +1288,76 @@ Enables exporting 9p share as a readonly mount for guests. By default
>  read-write access is given.
>  @item socket=@var{socket}
>  Enables proxy filesystem driver to use passed socket file for communicating
> -with virtfs-proxy-helper
> +with virtfs-proxy-helper(1).
>  @item sock_fd=@var{sock_fd}
>  Enables proxy filesystem driver to use passed socket descriptor for
> -communicating with virtfs-proxy-helper. Usually a helper like libvirt
> -will create socketpair and pass one of the fds as sock_fd
> +communicating with virtfs-proxy-helper(1). Usually a helper like libvirt
> +will create socketpair and pass one of the fds as sock_fd.
>  @item fmode=@var{fmode}
>  Specifies the default mode for newly created files on the host. Works only
>  with security models "mapped-xattr" and "mapped-file".
>  @item dmode=@var{dmode}
>  Specifies the default mode for newly created directories on the host. Works
>  only with security models "mapped-xattr" and "mapped-file".
> +@item throttling.bps-total=@var{b},throttling.bps-read=@var{r},throttling.bps-write=@var{w}
> +Specify bandwidth throttling limits in bytes per second, either for all request
> +types or for reads or writes only.
> +@item throttling.bps-total-max=@var{bm},bps-read-max=@var{rm},bps-write-max=@var{wm}
> +Specify bursts in bytes per second, either for all request types or for reads
> +or writes only.  Bursts allow the guest I/O to spike above the limit
> +temporarily.
> +@item throttling.iops-total=@var{i},throttling.iops-read=@var{r}, throttling.iops-write=@var{w}
> +Specify request rate limits in requests per second, either for all request
> +types or for reads or writes only.
> +@item throttling.iops-total-max=@var{im},throttling.iops-read-max=@var{irm}, throttling.iops-write-max=@var{iwm}
> +Specify bursts in requests per second, either for all request types or for reads
> +or writes only.  Bursts allow the guest I/O to spike above the limit temporarily.
> +@item throttling.iops-size=@var{is}
> +Let every @var{is} bytes of a request count as a new request for iops
> +throttling purposes.
>  @end table
>  
> --fsdev option is used along with -device driver "virtio-9p-pci".
> -@item -device virtio-9p-pci,fsdev=@var{id},mount_tag=@var{mount_tag}
> -Options for virtio-9p-pci driver are:
> +-fsdev option is used along with -device driver "virtio-9p-...".
> +@item -device virtio-9p-@var{type},fsdev=@var{id},mount_tag=@var{mount_tag}
> +Options for virtio-9p-... driver are:
>  @table @option
> +@item @var{type}
> +Specifies the variant to be used. Supported values are "pci", "ccw" or "device",
> +depending on the machine type.
>  @item fsdev=@var{id}
> -Specifies the id value specified along with -fsdev option
> +Specifies the id value specified along with -fsdev option.
>  @item mount_tag=@var{mount_tag}
> -Specifies the tag name to be used by the guest to mount this export point
> +Specifies the tag name to be used by the guest to mount this export point.
>  @end table
>  
>  ETEXI
>  
>  DEF("virtfs", HAS_ARG, QEMU_OPTION_virtfs,
> -    "-virtfs local,path=path,mount_tag=tag,security_model=[mapped-xattr|mapped-file|passthrough|none]\n"
> -    "        [,id=id][,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd][,fmode=fmode][,dmode=dmode]\n",
> +    "-virtfs local,path=path,mount_tag=tag,security_model=mapped-xattr|mapped-file|passthrough|none\n"
> +    "        [,id=id][,writeout=immediate][,readonly][,fmode=fmode][,dmode=dmode]\n"
> +    "-virtfs proxy,mount_tag=tag,socket=socket[,id=id][,writeout=immediate][,readonly]\n"
> +    "-virtfs proxy,mount_tag=tag,sock_fd=sock_fd[,id=id][,writeout=immediate][,readonly]\n"
> +    "-virtfs synth,mount_tag=tag[,id=id][,readonly]\n",
>      QEMU_ARCH_ALL)
>  
>  STEXI
>  
> -@item -virtfs @var{fsdriver}[,path=@var{path}],mount_tag=@var{mount_tag}[,security_model=@var{security_model}][,writeout=@var{writeout}][,readonly][,socket=@var{socket}|sock_fd=@var{sock_fd}][,fmode=@var{fmode}][,dmode=@var{dmode}]
> +@item -virtfs local,path=@var{path},mount_tag=@var{mount_tag} ,security_model=@var{security_model}[,writeout=@var{writeout}][,readonly] [,fmode=@var{fmode}][,dmode=@var{dmode}]
> +@itemx -virtfs proxy,socket=@var{socket},mount_tag=@var{mount_tag} [,writeout=@var{writeout}][,readonly]
> +@itemx -virtfs proxy,sock_fd=@var{sock_fd},mount_tag=@var{mount_tag} [,writeout=@var{writeout}][,readonly]
> +@itemx -virtfs synth,mount_tag=@var{mount_tag}
>  @findex -virtfs
>  
> -The general form of a Virtual File system pass-through options are:
> +Define a new filesystem device and expose it to the guest using a virtio-9p-device. The general form of a Virtual File system pass-through options are:
>  @table @option
> -@item @var{fsdriver}
> -This option specifies the fs driver backend to use.
> -Currently "local" and "proxy" file system drivers are supported.
> +@item local
> +Accesses to the filesystem are done by QEMU.
> +@item proxy
> +Accesses to the filesystem are done by virtfs-proxy-helper(1).
> +@item synth
> +Synthetic filesystem, only used by QTests.
>  @item id=@var{id}
> -Specifies identifier for this device
> +Specifies identifier for the filesystem device
>  @item path=@var{path}
>  Specifies the export path for the file system device. Files under
>  this path will be available to the 9p client on the guest.
> @@ -1348,17 +1385,19 @@ Enables exporting 9p share as a readonly mount for guests. By default
>  read-write access is given.
>  @item socket=@var{socket}
>  Enables proxy filesystem driver to use passed socket file for
> -communicating with virtfs-proxy-helper. Usually a helper like libvirt
> -will create socketpair and pass one of the fds as sock_fd
> +communicating with virtfs-proxy-helper(1). Usually a helper like libvirt
> +will create socketpair and pass one of the fds as sock_fd.
>  @item sock_fd
>  Enables proxy filesystem driver to use passed 'sock_fd' as the socket
> -descriptor for interfacing with virtfs-proxy-helper
> +descriptor for interfacing with virtfs-proxy-helper(1).
>  @item fmode=@var{fmode}
>  Specifies the default mode for newly created files on the host. Works only
>  with security models "mapped-xattr" and "mapped-file".
>  @item dmode=@var{dmode}
>  Specifies the default mode for newly created directories on the host. Works
>  only with security models "mapped-xattr" and "mapped-file".
> +@item mount_tag=@var{mount_tag}
> +Specifies the tag name to be used by the guest to mount this export point.
>  @end table
>  ETEXI
>  
> 

Re: [Qemu-devel] [PATCH v2 2/2] virtfs: Fix documentation of -fsdev and -virtfs

[Thomas Huth]

On 17/05/2019 15.17, Greg Kurz wrote:
> On Mon, 13 May 2019 12:34:10 +0200
> Greg Kurz <groug@kaod.org> wrote:
> 
>> This fixes several things:
>> - add "id" description to -virtfs documentation
>> - split the description into several lines in both usage and documentation
>>   for accurateness and clarity
>> - add documentation and usage of the synth fsdriver
>> - add "throttling.*" description to -fsdev local
>> - add some missing periods
>> - add proper reference to the virtfs-proxy-helper(1) manual page
>> - document that the virtio device may be either virtio-9p-pci, virtio-9p-ccw
>>   or virtio-9p-device, depending on the machine type
>>
>> Buglink: https://bugs.launchpad.net/qemu/+bug/1581976
>> Signed-off-by: Greg Kurz <groug@kaod.org>
>> ---
>> v2: - mention virtfs-proxy-helper(1) change in the changelog
>>     - mention virtio-9p-ccw and virtio-9p-device
>> ---
> 
> Thomas,
> 
> Unless you (or anyone else) have some objections, I intend to apply this patch
> and issue a pull request in a near future.

Fine for me - I just lack the detailed 9p knowledge to provide a real
"Reviewed-by" here, I hope you were not waiting for it? ... but if it
helps, I can at least say:

Acked-by: Thomas Huth <thuth@redhat.com>

Re: [Qemu-devel] [PATCH v2 2/2] virtfs: Fix documentation of -fsdev and -virtfs

[Greg Kurz]

On Fri, 17 May 2019 15:22:48 +0200
Thomas Huth <thuth@redhat.com> wrote:

> On 17/05/2019 15.17, Greg Kurz wrote:
> > On Mon, 13 May 2019 12:34:10 +0200
> > Greg Kurz <groug@kaod.org> wrote:
> >   
> >> This fixes several things:
> >> - add "id" description to -virtfs documentation
> >> - split the description into several lines in both usage and documentation
> >>   for accurateness and clarity
> >> - add documentation and usage of the synth fsdriver
> >> - add "throttling.*" description to -fsdev local
> >> - add some missing periods
> >> - add proper reference to the virtfs-proxy-helper(1) manual page
> >> - document that the virtio device may be either virtio-9p-pci, virtio-9p-ccw
> >>   or virtio-9p-device, depending on the machine type
> >>
> >> Buglink: https://bugs.launchpad.net/qemu/+bug/1581976
> >> Signed-off-by: Greg Kurz <groug@kaod.org>
> >> ---
> >> v2: - mention virtfs-proxy-helper(1) change in the changelog
> >>     - mention virtio-9p-ccw and virtio-9p-device
> >> ---  
> > 
> > Thomas,
> > 
> > Unless you (or anyone else) have some objections, I intend to apply this patch
> > and issue a pull request in a near future.  
> 
> Fine for me - I just lack the detailed 9p knowledge to provide a real
> "Reviewed-by" here, I hope you were not waiting for it?

Heh, no pb, I wasn't expecting a detailed review.

> ... but if it
> helps, I can at least say:
> 
> Acked-by: Thomas Huth <thuth@redhat.com>

Works for me :)

Thanks Thomas !

--
Greg