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RE: [PATCH-for-5.1] accel/xen: Fix xen_enabled() behavior on target-agno
From: |
Paul Durrant |
Subject: |
RE: [PATCH-for-5.1] accel/xen: Fix xen_enabled() behavior on target-agnostic objects |
Date: |
Tue, 28 Jul 2020 12:37:42 +0100 |
> -----Original Message-----
> From: Philippe Mathieu-Daudé <philmd@redhat.com>
> Sent: 28 July 2020 11:09
> To: qemu-devel@nongnu.org
> Cc: Paul Durrant <paul@xen.org>; Paolo Bonzini <pbonzini@redhat.com>;
> xen-devel@lists.xenproject.org;
> Stefano Stabellini <sstabellini@kernel.org>; Anthony Perard
> <anthony.perard@citrix.com>; Philippe
> Mathieu-Daudé <philmd@redhat.com>; Paul Durrant <pdurrant@amazon.com>; Peter
> Maydell
> <peter.maydell@linaro.org>
> Subject: [PATCH-for-5.1] accel/xen: Fix xen_enabled() behavior on
> target-agnostic objects
>
> CONFIG_XEN is generated by configure and stored in "config-target.h",
> which is (obviously) only include for target-specific objects.
> This is a problem for target-agnostic objects as CONFIG_XEN is never
> defined and xen_enabled() is always inlined as 'false'.
>
> Fix by following the KVM schema, defining CONFIG_XEN_IS_POSSIBLE
> when we don't know to force the call of the non-inlined function,
> returning the xen_allowed boolean.
>
> Fixes: da278d58a092 ("accel: Move Xen accelerator code under accel/xen/")
> Reported-by: Paul Durrant <pdurrant@amazon.com>
> Suggested-by: Peter Maydell <peter.maydell@linaro.org>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Paul Durrant <paul@xen.org>
> ---
> include/sysemu/xen.h | 14 +++++++++++---
> 1 file changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/include/sysemu/xen.h b/include/sysemu/xen.h
> index 1ca292715e..385a1fa2bf 100644
> --- a/include/sysemu/xen.h
> +++ b/include/sysemu/xen.h
> @@ -8,7 +8,15 @@
> #ifndef SYSEMU_XEN_H
> #define SYSEMU_XEN_H
>
> -#ifdef CONFIG_XEN
> +#ifdef NEED_CPU_H
> +# ifdef CONFIG_XEN
> +# define CONFIG_XEN_IS_POSSIBLE
> +# endif
> +#else
> +# define CONFIG_XEN_IS_POSSIBLE
> +#endif
> +
> +#ifdef CONFIG_XEN_IS_POSSIBLE
>
> bool xen_enabled(void);
>
> @@ -18,7 +26,7 @@ void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size,
> struct MemoryRegion *mr, Error **errp);
> #endif
>
> -#else /* !CONFIG_XEN */
> +#else /* !CONFIG_XEN_IS_POSSIBLE */
>
> #define xen_enabled() 0
> #ifndef CONFIG_USER_ONLY
> @@ -33,6 +41,6 @@ static inline void xen_ram_alloc(ram_addr_t ram_addr,
> ram_addr_t size,
> }
> #endif
>
> -#endif /* CONFIG_XEN */
> +#endif /* CONFIG_XEN_IS_POSSIBLE */
>
> #endif
> --
> 2.21.3