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David Alan Gilbert" , linux-mm@kvack.org, linux-kernel@vger.kernel.org, James Houghton Content-Type: text/plain; charset="UTF-8" ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1656092262; a=rsa-sha256; cv=none; b=7OAC45d09VreWnlXIi7itqptSn75NxUE2mdOIAgQkEwF1T38OoghUdkA4aBaMii2kDWxf+ AT76JvSqQ2XDhlKu7QEW67tWiN8koK8fL1PJ4CGSeq2VpWkNfHIczpIOGLZ5ryTPMxgiPC NmuRRSCq8bWHp/xOLNEZD3000ivIMKU= ARC-Authentication-Results: i=1; imf22.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=Vv9tNv7i; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf22.hostedemail.com: domain of 3Zva1YgoKCEcs2qx3pq2xwpxxpun.lxvurw36-vvt4jlt.x0p@flex--jthoughton.bounces.google.com designates 209.85.219.202 as permitted sender) smtp.mailfrom=3Zva1YgoKCEcs2qx3pq2xwpxxpun.lxvurw36-vvt4jlt.x0p@flex--jthoughton.bounces.google.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1656092262; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=fAGdwktIt8KMFEeY6rcBub88vVCunW5aTmCo6YUaLic=; b=KwCij3egO0UUqRi4+h21LGPAHwnCGbV+HukPf23wRfgjUb/TOBWmiwwd9V9eQGXSd8H0oP 9EKcDo+B//ZyWCE//K+pithnRsWdwts4RpTnXaE29Jsd40NGVx8/S/ChkA6AVmcNULnIGs fYyMCPAZWqruj72QQr0sA1syB/+ymb4= X-Rspam-User: X-Stat-Signature: kfcc1euct4xo4wwnpo98ys4sd71fk9yt X-Rspamd-Queue-Id: 9D719C001B Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=Vv9tNv7i; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf22.hostedemail.com: domain of 3Zva1YgoKCEcs2qx3pq2xwpxxpun.lxvurw36-vvt4jlt.x0p@flex--jthoughton.bounces.google.com designates 209.85.219.202 as permitted sender) smtp.mailfrom=3Zva1YgoKCEcs2qx3pq2xwpxxpun.lxvurw36-vvt4jlt.x0p@flex--jthoughton.bounces.google.com X-Rspamd-Server: rspam03 X-HE-Tag: 1656092262-882068 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: This is so that userspace is aware that their kernel was compiled with HugeTLB high-granularity mapping and that UFFDIO_CONTINUE down to PAGE_SIZE-aligned chunks are valid. Signed-off-by: James Houghton --- fs/userfaultfd.c | 7 ++++++- include/uapi/linux/userfaultfd.h | 2 ++ 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index 77c1b8a7d0b9..59bfdb7a67e0 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -1935,10 +1935,15 @@ static int userfaultfd_api(struct userfaultfd_ctx *ctx, goto err_out; /* report all available features and ioctls to userland */ uffdio_api.features = UFFD_API_FEATURES; + #ifndef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR uffdio_api.features &= ~(UFFD_FEATURE_MINOR_HUGETLBFS | UFFD_FEATURE_MINOR_SHMEM); -#endif +#ifndef CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING + uffdio_api.features &= ~UFFD_FEATURE_MINOR_HUGETLBFS_HGM; +#endif /* CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING */ +#endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */ + #ifndef CONFIG_HAVE_ARCH_USERFAULTFD_WP uffdio_api.features &= ~UFFD_FEATURE_PAGEFAULT_FLAG_WP; #endif diff --git a/include/uapi/linux/userfaultfd.h b/include/uapi/linux/userfaultfd.h index 7d32b1e797fb..50fbcb0bcba0 100644 --- a/include/uapi/linux/userfaultfd.h +++ b/include/uapi/linux/userfaultfd.h @@ -32,6 +32,7 @@ UFFD_FEATURE_SIGBUS | \ UFFD_FEATURE_THREAD_ID | \ UFFD_FEATURE_MINOR_HUGETLBFS | \ + UFFD_FEATURE_MINOR_HUGETLBFS_HGM | \ UFFD_FEATURE_MINOR_SHMEM | \ UFFD_FEATURE_EXACT_ADDRESS | \ UFFD_FEATURE_WP_HUGETLBFS_SHMEM) @@ -213,6 +214,7 @@ struct uffdio_api { #define UFFD_FEATURE_MINOR_SHMEM (1<<10) #define UFFD_FEATURE_EXACT_ADDRESS (1<<11) #define UFFD_FEATURE_WP_HUGETLBFS_SHMEM (1<<12) +#define UFFD_FEATURE_MINOR_HUGETLBFS_HGM (1<<13) __u64 features; __u64 ioctls; -- 2.37.0.rc0.161.g10f37bed90-goog