Run some memfd-related checks before registering hostmem-memfd & various properties. This will help libvirt to figure out what the host is supposed to be capable of. qemu_memfd_check() is changed to a less optimized version, since it is used with various flags, it no longer caches the result. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20180906161415.8543-1-marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
#ifndef QEMU_MEMFD_H
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#define QEMU_MEMFD_H
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#ifndef F_LINUX_SPECIFIC_BASE
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#define F_LINUX_SPECIFIC_BASE 1024
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#endif
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#ifndef F_ADD_SEALS
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#define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
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#define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
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#define F_SEAL_SEAL 0x0001 /* prevent further seals from being set */
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#define F_SEAL_SHRINK 0x0002 /* prevent file from shrinking */
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#define F_SEAL_GROW 0x0004 /* prevent file from growing */
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#define F_SEAL_WRITE 0x0008 /* prevent writes */
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#endif
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#ifndef MFD_CLOEXEC
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#define MFD_CLOEXEC 0x0001U
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#endif
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#ifndef MFD_ALLOW_SEALING
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#define MFD_ALLOW_SEALING 0x0002U
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#endif
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#ifndef MFD_HUGETLB
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#define MFD_HUGETLB 0x0004U
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#endif
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#ifndef MFD_HUGE_SHIFT
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#define MFD_HUGE_SHIFT 26
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#endif
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int qemu_memfd_create(const char *name, size_t size, bool hugetlb,
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uint64_t hugetlbsize, unsigned int seals, Error **errp);
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bool qemu_memfd_alloc_check(void);
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void *qemu_memfd_alloc(const char *name, size_t size, unsigned int seals,
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int *fd, Error **errp);
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void qemu_memfd_free(void *ptr, size_t size, int fd);
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bool qemu_memfd_check(unsigned int flags);
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#endif /* QEMU_MEMFD_H */
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