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Re: [PATCH] xen/console: introduce console_{get,put}_domain()
- To: dmkhn@xxxxxxxxx
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 26 Feb 2025 12:30:04 +0100
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- Cc: andrew.cooper3@xxxxxxxxxx, anthony.perard@xxxxxxxxxx, julien@xxxxxxx, michal.orzel@xxxxxxx, roger.pau@xxxxxxxxxx, sstabellini@xxxxxxxxxx, dmukhin@xxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 26 Feb 2025 11:30:19 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 18.02.2025 09:31, dmkhn@xxxxxxxxx wrote:
> From: Denis Mukhin <dmukhin@xxxxxxxx>
>
> console_input_domain() takes an RCU lock to protect domain structure.
> That implies call to rcu_unlock_domain() after use.
>
> Introduce a pair of console_get_domain() / console_put_domain() to highlight
> the correct use of the call within the code interacting with Xen console
> driver.
>
> The new calls used in __serial_rx(), which also fixed console forwarding to
> late hardware domains which run with domain IDs different from 0.
>
> Signed-off-by: Denis Mukhin <dmukhin@xxxxxxxx>
> ---
> Link to the original patch:
>
> https://lore.kernel.org/xen-devel/20250103-vuart-ns8250-v3-v1-4-c5d36b31d66c@xxxxxxxx/
> ---
> xen/arch/arm/vpl011.c | 6 ++---
> xen/drivers/char/console.c | 53 +++++++++++++++++++-------------------
> xen/include/xen/console.h | 3 ++-
> 3 files changed, 32 insertions(+), 30 deletions(-)
>
This patch doesn't apply to staging. Looks like it depends on "arm/vuart:
move vpl011-related code to vpl011 emulator" without this being said anywhere.
Jan
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