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e5f57aaccb
[ Upstream commit a603002eea ]
Instead of having a global flag to require restricted memory access
for all virtio devices, introduce a callback which can select that
requirement on a per-device basis.
For convenience add a common function returning always true, which can
be used for use cases like SEV.
Per default use a callback always returning false.
As the callback needs to be set in early init code already, add a
virtio anchor which is builtin in case virtio is enabled.
Signed-off-by: Juergen Gross <jgross@suse.com>
Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # Arm64 guest using Xen
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Link: https://lore.kernel.org/r/20220622063838.8854-2-jgross@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
15 lines
449 B
C
15 lines
449 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _PLATFORM_FEATURE_H
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#define _PLATFORM_FEATURE_H
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#include <linux/bitops.h>
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#include <asm/platform-feature.h>
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/* The platform features are starting with the architecture specific ones. */
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#define PLATFORM_FEAT_N (0 + PLATFORM_ARCH_FEAT_N)
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void platform_set(unsigned int feature);
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void platform_clear(unsigned int feature);
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bool platform_has(unsigned int feature);
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#endif /* _PLATFORM_FEATURE_H */
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