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virtio: replace arch_has_restricted_virtio_memory_access()

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Instead of using arch_has_restricted_virtio_memory_access() together
with CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS, replace those
with platform_has() and a new platform feature
PLATFORM_VIRTIO_RESTRICTED_MEM_ACCESS.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # Arm64 only
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Juergen Gross 2022-06-06 08:09:16 +02:00
parent 2130a790ca
commit 3f9dfbebdc
9 changed files with 14 additions and 38 deletions
Download patch file Download diff file Expand all files Collapse all files

6
include/linux/platform-feature.h
View file

@ -6,7 +6,11 @@
#include <asm/platform-feature.h>
/* The platform features are starting with the architecture specific ones. */
#define PLATFORM_FEAT_N (0 + PLATFORM_ARCH_FEAT_N)
/* Used to enable platform specific DMA handling for virtio devices. */
#define PLATFORM_VIRTIO_RESTRICTED_MEM_ACCESS (0 + PLATFORM_ARCH_FEAT_N)
#define PLATFORM_FEAT_N (1 + PLATFORM_ARCH_FEAT_N)
void platform_set(unsigned int feature);
void platform_clear(unsigned int feature);

9
include/linux/virtio_config.h
View file

@ -604,13 +604,4 @@ static inline void virtio_cwrite64(struct virtio_device *vdev,
_r; \
})
#ifdef CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
int arch_has_restricted_virtio_memory_access(void);
#else
static inline int arch_has_restricted_virtio_memory_access(void)
{
return 0;
}
#endif /* CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS */
#endif /* _LINUX_VIRTIO_CONFIG_H */