postcopy: Update userfaultfd.h header
Just the userfaultfd.h update from Paolo's header update run; * Drop this patch after Paolo's update goes in * Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <20170224182844.32452-14-dgilbert@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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@ -11,13 +11,18 @@
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#include <linux/types.h>
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#define UFFD_API ((__u64)0xAA)
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/*
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* After implementing the respective features it will become:
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* #define UFFD_API_FEATURES (UFFD_FEATURE_PAGEFAULT_FLAG_WP | \
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* UFFD_FEATURE_EVENT_FORK)
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* If the UFFDIO_API is upgraded someday, the UFFDIO_UNREGISTER and
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* UFFDIO_WAKE ioctls should be defined as _IOW and not as _IOR. In
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* userfaultfd.h we assumed the kernel was reading (instead _IOC_READ
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* means the userland is reading).
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*/
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#define UFFD_API_FEATURES (0)
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#define UFFD_API ((__u64)0xAA)
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#define UFFD_API_FEATURES (UFFD_FEATURE_EVENT_FORK | \
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UFFD_FEATURE_EVENT_REMAP | \
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UFFD_FEATURE_EVENT_MADVDONTNEED | \
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UFFD_FEATURE_MISSING_HUGETLBFS | \
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UFFD_FEATURE_MISSING_SHMEM)
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#define UFFD_API_IOCTLS \
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((__u64)1 << _UFFDIO_REGISTER | \
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(__u64)1 << _UFFDIO_UNREGISTER | \
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@ -26,6 +31,9 @@
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((__u64)1 << _UFFDIO_WAKE | \
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(__u64)1 << _UFFDIO_COPY | \
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(__u64)1 << _UFFDIO_ZEROPAGE)
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#define UFFD_API_RANGE_IOCTLS_BASIC \
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((__u64)1 << _UFFDIO_WAKE | \
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(__u64)1 << _UFFDIO_COPY)
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/*
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* Valid ioctl command number range with this API is from 0x00 to
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@ -71,6 +79,21 @@ struct uffd_msg {
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__u64 address;
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} pagefault;
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struct {
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__u32 ufd;
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} fork;
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struct {
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__u64 from;
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__u64 to;
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__u64 len;
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} remap;
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struct {
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__u64 start;
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__u64 end;
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} madv_dn;
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struct {
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/* unused reserved fields */
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__u64 reserved1;
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@ -84,9 +107,9 @@ struct uffd_msg {
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* Start at 0x12 and not at 0 to be more strict against bugs.
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*/
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#define UFFD_EVENT_PAGEFAULT 0x12
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#if 0 /* not available yet */
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#define UFFD_EVENT_FORK 0x13
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#endif
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#define UFFD_EVENT_REMAP 0x14
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#define UFFD_EVENT_MADVDONTNEED 0x15
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/* flags for UFFD_EVENT_PAGEFAULT */
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#define UFFD_PAGEFAULT_FLAG_WRITE (1<<0) /* If this was a write fault */
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@ -104,11 +127,37 @@ struct uffdio_api {
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* Note: UFFD_EVENT_PAGEFAULT and UFFD_PAGEFAULT_FLAG_WRITE
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* are to be considered implicitly always enabled in all kernels as
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* long as the uffdio_api.api requested matches UFFD_API.
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*
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* UFFD_FEATURE_MISSING_HUGETLBFS means an UFFDIO_REGISTER
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* with UFFDIO_REGISTER_MODE_MISSING mode will succeed on
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* hugetlbfs virtual memory ranges. Adding or not adding
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* UFFD_FEATURE_MISSING_HUGETLBFS to uffdio_api.features has
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* no real functional effect after UFFDIO_API returns, but
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* it's only useful for an initial feature set probe at
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* UFFDIO_API time. There are two ways to use it:
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*
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* 1) by adding UFFD_FEATURE_MISSING_HUGETLBFS to the
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* uffdio_api.features before calling UFFDIO_API, an error
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* will be returned by UFFDIO_API on a kernel without
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* hugetlbfs missing support
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*
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* 2) the UFFD_FEATURE_MISSING_HUGETLBFS can not be added in
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* uffdio_api.features and instead it will be set by the
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* kernel in the uffdio_api.features if the kernel supports
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* it, so userland can later check if the feature flag is
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* present in uffdio_api.features after UFFDIO_API
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* succeeded.
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*
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* UFFD_FEATURE_MISSING_SHMEM works the same as
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* UFFD_FEATURE_MISSING_HUGETLBFS, but it applies to shmem
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* (i.e. tmpfs and other shmem based APIs).
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*/
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#if 0 /* not available yet */
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#define UFFD_FEATURE_PAGEFAULT_FLAG_WP (1<<0)
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#define UFFD_FEATURE_EVENT_FORK (1<<1)
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#endif
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#define UFFD_FEATURE_EVENT_REMAP (1<<2)
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#define UFFD_FEATURE_EVENT_MADVDONTNEED (1<<3)
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#define UFFD_FEATURE_MISSING_HUGETLBFS (1<<4)
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#define UFFD_FEATURE_MISSING_SHMEM (1<<5)
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__u64 features;
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__u64 ioctls;
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