linux.git/include/xen/interface, branch v6.12.80

xen/mcelog: Add __nonstring annotations for unterminated strings

2025-04-20T08:15:12+00:00

[ Upstream commit 1c3dfc7c6b0f551fdca3f7c1f1e4c73be8adb17d ]

When a character array without a terminating NUL character has a static
initializer, GCC 15's -Wunterminated-string-initialization will only
warn if the array lacks the "nonstring" attribute[1]. Mark the arrays
with __nonstring to and correctly identify the char array as "not a C
string" and thereby eliminate the warning.

Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117178 [1]
Cc: Juergen Gross 
Cc: Stefano Stabellini 
Cc: Oleksandr Tyshchenko 
Cc: xen-devel@lists.xenproject.org
Signed-off-by: Kees Cook 
Acked-by: Juergen Gross 
Message-ID: <20250310222234.work.473-kees@kernel.org>
Signed-off-by: Juergen Gross 
Signed-off-by: Sasha Levin

xen: sync elfnote.h from xen tree

2024-09-25T12:15:04+00:00

Sync Xen's elfnote.h header from xen.git to pull in the
XEN_ELFNOTE_PHYS32_RELOC define.

xen commit dfc9fab00378 ("x86/PVH: Support relocatable dom0 kernels")

This is a copy except for the removal of the emacs editor config at the
end of the file.

Signed-off-by: Jason Andryuk 
Reviewed-by: Juergen Gross 
Message-ID: <20240823193630.2583107-2-jason.andryuk@amd.com>
Signed-off-by: Juergen Gross

xen/pci: Add a function to reset device for xen

2024-09-25T07:54:40+00:00

When device on dom0 side has been reset, the vpci on Xen side
won't get notification, so that the cached state in vpci is
all out of date with the real device state.
To solve that problem, add a new function to clear all vpci
device state when device is reset on dom0 side.

And call that function in pcistub_init_device. Because when
using "pci-assignable-add" to assign a passthrough device in
Xen, it will reset passthrough device and the vpci state will
out of date, and then device will fail to restore bar state.

Signed-off-by: Jiqian Chen 
Signed-off-by: Huang Rui 
Signed-off-by: Jiqian Chen 
Reviewed-by: Stefano Stabellini 
Message-ID: <20240924061437.2636766-2-Jiqian.Chen@amd.com>
Signed-off-by: Juergen Gross

xen: update PV-device interface headers

2024-01-09T10:46:24+00:00

Update the Xen PV-device interface headers in order to avoid undefined
behavior with flexible arrays being defined with one array element.

Reported-by: Pry Mar 
Signed-off-by: Juergen Gross 
Acked-by: Stefano Stabellini 
Link: https://lore.kernel.org/r/20231205115121.11627-1-jgross@suse.com
Signed-off-by: Juergen Gross

xen: privcmd: Add support for ioeventfd

2023-10-16T13:18:33+00:00

Virtio guests send VIRTIO_MMIO_QUEUE_NOTIFY notification when they need
to notify the backend of an update to the status of the virtqueue. The
backend or another entity, polls the MMIO address for updates to know
when the notification is sent.

It works well if the backend does this polling by itself. But as we move
towards generic backend implementations, we end up implementing this in
a separate user-space program.

Generally, the Virtio backends are implemented to work with the Eventfd
based mechanism. In order to make such backends work with Xen, another
software layer needs to do the polling and send an event via eventfd to
the backend once the notification from guest is received. This results
in an extra context switch.

This is not a new problem in Linux though. It is present with other
hypervisors like KVM, etc. as well. The generic solution implemented in
the kernel for them is to provide an IOCTL call to pass the address to
poll and eventfd, which lets the kernel take care of polling and raise
an event on the eventfd, instead of handling this in user space (which
involves an extra context switch).

This patch adds similar support for xen.

Inspired by existing implementations for KVM, etc..

This also copies ioreq.h header file (only struct ioreq and related
macros) from Xen's source tree (Top commit 5d84f07fe6bf ("xen/pci: drop
remaining uses of bool_t")).

Signed-off-by: Viresh Kumar 
Reviewed-by: Juergen Gross 
Link: https://lore.kernel.org/r/b20d83efba6453037d0c099912813c79c81f7714.1697439990.git.viresh.kumar@linaro.org
Signed-off-by: Juergen Gross

x86/PVH: obtain VGA console info in Dom0

2023-03-14T14:20:51+00:00

A new platform-op was added to Xen to allow obtaining the same VGA
console information PV Dom0 is handed. Invoke the new function and have
the output data processed by xen_init_vga().

Signed-off-by: Jan Beulich 
Reviewed-by: Juergen Gross 

Link: https://lore.kernel.org/r/8f315e92-7bda-c124-71cc-478ab9c5e610@suse.com
Signed-off-by: Juergen Gross

x86/xen: Add support for HVMOP_set_evtchn_upcall_vector

2022-08-12T09:28:21+00:00

Implement support for the HVMOP_set_evtchn_upcall_vector hypercall in
order to set the per-vCPU event channel vector callback on Linux and
use it in preference of HVM_PARAM_CALLBACK_IRQ.

If the per-VCPU vector setup is successful on BSP, use this method
for the APs. If not, fallback to the global vector-type callback.

Also register callback_irq at per-vCPU event channel setup to trick
toolstack to think the domain is enlightened.

Suggested-by: "Roger Pau Monné" 
Signed-off-by: Jane Malalane 
Reviewed-by: Boris Ostrovsky 
Link: https://lore.kernel.org/r/20220729070416.23306-1-jane.malalane@citrix.com
Signed-off-by: Juergen Gross

xen: sync xs_wire.h header with upstream xen

2022-05-19T12:44:05+00:00

Sync the xs_wire.h header file in Linux with the one in Xen.

Signed-off-by: Stefano Stabellini 
Reviewed-by: Boris Ostrovsky 
Link: https://lore.kernel.org/r/20220513211938.719341-1-sstabellini@kernel.org
Signed-off-by: Juergen Gross

xen: update ring.h

2022-05-19T12:21:53+00:00

Update include/xen/interface/io/ring.h to its newest version.

Switch the two improper use cases of RING_HAS_UNCONSUMED_RESPONSES() to
XEN_RING_NR_UNCONSUMED_RESPONSES() in order to avoid the nasty
XEN_RING_HAS_UNCONSUMED_IS_BOOL #define.

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

xen: update grant_table.h

2022-05-19T12:21:34+00:00

Update include/xen/interface/grant_table.h to its newest version.

This allows to drop some private definitions in grant-table.c and
include/xen/grant_table.h.

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