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Re: [PATCH v4] xen/consoled: clean up console handling for PV shim
- To: dmkhn@xxxxxxxxx
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 5 Mar 2025 17:31:07 +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, 05 Mar 2025 16:31:23 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26.02.2025 23:47, dmkhn@xxxxxxxxx wrote:
> @@ -562,10 +560,9 @@ static void __serial_rx(char c)
> rc = vpl011_rx_char_xen(d, c);
> #endif
>
> -#ifdef CONFIG_X86
> - if ( pv_shim && pv_console )
> - consoled_guest_tx(c);
> -#endif
> + if ( consoled_is_enabled() )
> + /* Deliver input to the PV shim console. */
> + rc = consoled_guest_tx(c);
With this being the only call site of consoled_guest_tx(), ...
> --- a/xen/include/xen/consoled.h
> +++ b/xen/include/xen/consoled.h
> @@ -1,12 +1,28 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> #ifndef __XEN_CONSOLED_H__
> #define __XEN_CONSOLED_H__
>
> #include <public/io/console.h>
>
> +#ifdef CONFIG_PV_SHIM
> +
> void consoled_set_ring_addr(struct xencons_interface *ring);
> struct xencons_interface *consoled_get_ring_addr(void);
> -void consoled_guest_rx(void);
> -void consoled_guest_tx(char c);
> +int consoled_guest_rx(void);
> +int consoled_guest_tx(char c);
> +bool consoled_is_enabled(void);
> +
> +#else
> +
> +static inline int consoled_guest_tx(char c)
> +{
> + ASSERT_UNREACHABLE();
> + return -ENODEV;
> +}
... why is this stub needed when we have ...
> +#define consoled_is_enabled() (false)
... this compile-time-constant predicate? All that's needed is a visible
declaration of the function, for compilation to succeed. DCE will then take
care of eliminating the function call, and hence things will link fine.
Jan
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