linux.git/net/9p, branch v4.12

Merge tag 'for-linus-4.12b-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

2017-05-19T22:06:48+00:00

Pull xen fixes from Juergen Gross:
 "Some fixes for the new Xen 9pfs frontend and some minor cleanups"

* tag 'for-linus-4.12b-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen: make xen_flush_tlb_all() static
  xen: cleanup pvh leftovers from pv-only sources
  xen/9pfs: p9_trans_xen_init and p9_trans_xen_exit can be static
  xen/9pfs: fix return value check in xen_9pfs_front_probe()

xen/9pfs: p9_trans_xen_init and p9_trans_xen_exit can be static

2017-05-18T18:42:58+00:00

Fixes the following sparse warnings:

net/9p/trans_xen.c:528:5: warning:
 symbol 'p9_trans_xen_init' was not declared. Should it be static?
net/9p/trans_xen.c:540:6: warning:
 symbol 'p9_trans_xen_exit' was not declared. Should it be static?

Signed-off-by: Wei Yongjun 
Reviewed-by: Stefano Stabellini

xen/9pfs: fix return value check in xen_9pfs_front_probe()

2017-05-18T18:42:32+00:00

In case of error, the function xenbus_read() returns ERR_PTR() and never
returns NULL. The NULL test in the return value check should be replaced
with IS_ERR().

Fixes: 71ebd71921e4 ("xen/9pfs: connect to the backend")
Signed-off-by: Wei Yongjun 
Reviewed-by: Stefano Stabellini

Merge tag 'for-linus-4.12b-rc0b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

2017-05-04T18:37:09+00:00

Pull xen updates from Juergen Gross:
 "Xen fixes and featrues for 4.12. The main changes are:

   - enable building the kernel with Xen support but without enabling
     paravirtualized mode (Vitaly Kuznetsov)

   - add a new 9pfs xen frontend driver (Stefano Stabellini)

   - simplify Xen's cpuid handling by making use of cpu capabilities
     (Juergen Gross)

   - add/modify some headers for new Xen paravirtualized devices
     (Oleksandr Andrushchenko)

   - EFI reset_system support under Xen (Julien Grall)

   - and the usual cleanups and corrections"

* tag 'for-linus-4.12b-rc0b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: (57 commits)
  xen: Move xen_have_vector_callback definition to enlighten.c
  xen: Implement EFI reset_system callback
  arm/xen: Consolidate calls to shutdown hypercall in a single helper
  xen: Export xen_reboot
  xen/x86: Call xen_smp_intr_init_pv() on BSP
  xen: Revert commits da72ff5bfcb0 and 72a9b186292d
  xen/pvh: Do not fill kernel's e820 map in init_pvh_bootparams()
  xen/scsifront: use offset_in_page() macro
  xen/arm,arm64: rename __generic_dma_ops to xen_get_dma_ops
  xen/arm,arm64: fix xen_dma_ops after 815dd18 "Consolidate get_dma_ops..."
  xen/9pfs: select CONFIG_XEN_XENBUS_FRONTEND
  x86/cpu: remove hypervisor specific set_cpu_features
  vmware: set cpu capabilities during platform initialization
  x86/xen: use capabilities instead of fake cpuid values for xsave
  x86/xen: use capabilities instead of fake cpuid values for x2apic
  x86/xen: use capabilities instead of fake cpuid values for mwait
  x86/xen: use capabilities instead of fake cpuid values for acpi
  x86/xen: use capabilities instead of fake cpuid values for acc
  x86/xen: use capabilities instead of fake cpuid values for mtrr
  x86/xen: use capabilities instead of fake cpuid values for aperf
  ...

xen/9pfs: select CONFIG_XEN_XENBUS_FRONTEND

2017-05-02T09:14:36+00:00

All Xen frontends need to select this symbol to avoid a link error:

net/built-in.o: In function `p9_trans_xen_init':
:(.text+0x149e9c): undefined reference to `__xenbus_register_frontend'

Fixes: d4b40a02f837 ("xen/9pfs: build 9pfs Xen transport driver")
Signed-off-by: Arnd Bergmann 
Reviewed-by: Stefano Stabellini

xen/9pfs: initialize len to 0 to detect xenbus_read errors

2017-05-02T09:13:23+00:00

In order to use "len" to check for xenbus_read errors properly, we need
to initialize len to 0 before passing it to xenbus_read.

CC: dan.carpenter@oracle.com
CC: jgross@suse.com
CC: boris.ostrovsky@oracle.com
CC: Eric Van Hensbergen 
CC: Ron Minnich 
CC: Latchesar Ionkov 
CC: v9fs-developer@lists.sourceforge.net
Signed-off-by: Stefano Stabellini 
Reviewed-by: Juergen Gross 
Signed-off-by: Juergen Gross

xen/9pfs: build 9pfs Xen transport driver

2017-05-02T09:11:49+00:00

This patch adds a Kconfig option and Makefile support for building the
9pfs Xen driver.

CC: groug@kaod.org
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
CC: Eric Van Hensbergen 
CC: Ron Minnich 
CC: Latchesar Ionkov 
CC: v9fs-developer@lists.sourceforge.net

Signed-off-by: Stefano Stabellini 
Reviewed-by: Juergen Gross 
Signed-off-by: Juergen Gross

xen/9pfs: receive responses

2017-05-02T09:11:43+00:00

Upon receiving a notification from the backend, schedule the
p9_xen_response work_struct. p9_xen_response checks if any responses are
available, if so, it reads them one by one, calling p9_client_cb to send
them up to the 9p layer (p9_client_cb completes the request). Handle the
ring following the Xen 9pfs specification.

CC: groug@kaod.org
CC: jgross@suse.com
CC: Eric Van Hensbergen 
CC: Ron Minnich 
CC: Latchesar Ionkov 
CC: v9fs-developer@lists.sourceforge.net

Signed-off-by: Stefano Stabellini 
Reviewed-by: Boris Ostrovsky 
Reviewed-by: Juergen Gross 
Signed-off-by: Juergen Gross

xen/9pfs: send requests to the backend

2017-05-02T09:11:37+00:00

Implement struct p9_trans_module create and close functions by looking
at the available Xen 9pfs frontend-backend connections. We don't expect
many frontend-backend connections, thus walking a list is OK.

Send requests to the backend by copying each request to one of the
available rings (each frontend-backend connection comes with multiple
rings). Handle the ring and notifications following the 9pfs
specification. If there are not enough free bytes on the ring for the
request, wait on the wait_queue: the backend will send a notification
after consuming more requests.

CC: groug@kaod.org
CC: jgross@suse.com
CC: Eric Van Hensbergen 
CC: Ron Minnich 
CC: Latchesar Ionkov 
CC: v9fs-developer@lists.sourceforge.net

Signed-off-by: Stefano Stabellini 
Reviewed-by: Boris Ostrovsky 
Reviewed-by: Juergen Gross 
Signed-off-by: Juergen Gross

xen/9pfs: connect to the backend

2017-05-02T09:11:28+00:00

Implement functions to handle the xenbus handshake. Upon connection,
allocate the rings according to the protocol specification.

Initialize a work_struct and a wait_queue. The work_struct will be used
to schedule work upon receiving an event channel notification from the
backend. The wait_queue will be used to wait when the ring is full and
we need to send a new request.

CC: groug@kaod.org
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
CC: Eric Van Hensbergen 
CC: Ron Minnich 
CC: Latchesar Ionkov 
CC: v9fs-developer@lists.sourceforge.net

Signed-off-by: Stefano Stabellini 
Reviewed-by: Juergen Gross 
Signed-off-by: Juergen Gross