From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 2E4343793BF; Wed, 14 Jan 2026 21:38:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768426720; cv=none; b=C9+YyC8qVwbChrmIvS6OSzyoq6LddbP+ZwBpqMMBcaFvrGIVAJoyk52B5bN9jM19Ou6LsCyrmlyYkrzyqDsTAq00unt8/icLEB5og2NtM/XtsfOhD6mI2r6guw9VamVer4IFc3cntU1F4ZxsBpEZ9QqgcbnhmH3BV+xI1ISJW5A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768426720; c=relaxed/simple; bh=Ud9CO7xK3C6FIHXGrUVPSXdkbGzlwdZeUQL/ELqGItY=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=oFSft+7t4VepgAyr2TMqaM/I8WRa7QDDf1kOmZmEF3/g7uky/dvTtERCZEr1TopCpgpXU3KUYnARGOx8D9PRHiAE1S4S0UdNhfbATO+7g5qLPIpb6MPgF3Uc2lIxw1F9byqNZdOCOxwvgVdpwriuMYBalwsU1qfA/BhJxhlRhFs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=kh1GoLPU; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="kh1GoLPU" Received: by linux.microsoft.com (Postfix, from userid 1032) id 7FCBA20B7165; Wed, 14 Jan 2026 13:38:06 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 7FCBA20B7165 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1768426686; bh=3FPKL6RKZS3PAfmJj/ndI52aBJ1Zr63x+RcAackQQO0=; h=From:To:Cc:Subject:Date:From; b=kh1GoLPU0fsRrcvTx+MFGHYHpnW0h6HWITifRMu82LApikQM2wqMYexVJUaPKNqIC /x2cWYFvPVClknzenMmsVYDavTCbyUjGhER3oL/rCOz3bVbZ/Qd/GG80/20IE7aRf0 5mzelCXNuuZg0JZYGSzt4L4Is5SSQrpDDoUmK1SU= From: Nuno Das Neves To: linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, mhklinux@outlook.com, skinsburskii@linux.microsoft.com Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com, prapal@linux.microsoft.com, mrathor@linux.microsoft.com, paekkaladevi@linux.microsoft.com, Nuno Das Neves Subject: [PATCH v3 0/6] mshv: Debugfs interface for mshv_root Date: Wed, 14 Jan 2026 13:37:57 -0800 Message-ID: <20260114213803.143486-1-nunodasneves@linux.microsoft.com> X-Mailer: git-send-email 2.43.7 Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Expose hypervisor, logical processor, partition, and virtual processor statistics via debugfs. These are provided by mapping 'stats' pages via hypercall. Patch #1: Update hv_call_map_stats_page() to return success when HV_STATS_AREA_PARENT is unavailable, which is the case on some hypervisor versions, where it can fall back to HV_STATS_AREA_SELF Patch #2: Use struct hv_stats_page pointers instead of void * Patch #3: Make mshv_vp_stats_map/unmap() more flexible to use with debugfs code Patch #4: Always map vp stats page regardless of scheduler, to reuse in debugfs Patch #5: Introduce the definitions needed for the various stats pages Patch #6: Add mshv_debugfs.c, and integrate it with the mshv_root driver to expose the partition and VP stats. --- Changes in v3: - Add 3 small refactor/cleanup patches (patches 2,3,4) from Stanislav. These simplify some of the debugfs code, and fix issues with mapping VP stats on L1VH. - Fix cleanup of parent stats dentries on module removal (via squashing some internal patches into patch #6) [Praveen] - Remove unused goto label [Stanislav, kernel bot] - Use struct hv_stats_page * instead of void * in mshv_debugfs.c [Stanislav] - Remove some redundant variables [Stanislav] - Rename debugfs dentry fields for brevity [Stanislav] - Use ERR_CAST() for the dentry error pointer returned from lp_debugfs_stats_create() [Stanislav] - Fix leak of pages allocated for lp stats mappings by storing them in an array [Michael] - Add comments to clarify PARENT vs SELF usage and edge cases [Michael] - Add VpLoadAvg for x86 and print the stat [Michael] - Add NUM_STATS_AREAS for array sizing in mshv_debugfs.c [Michael] Changes in v2: - Remove unnecessary pr_debug_once() in patch 1 [Stanislav Kinsburskii] - CONFIG_X86 -> CONFIG_X86_64 in patch 2 [Stanislav Kinsburskii] --- Nuno Das Neves (2): mshv: Add definitions for stats pages mshv: Add debugfs to view hypervisor statistics Purna Pavan Chandra Aekkaladevi (1): mshv: Ignore second stats page map result failure Stanislav Kinsburskii (3): mshv: Use typed hv_stats_page pointers mshv: Improve mshv_vp_stats_map/unmap(), add them to mshv_root.h mshv: Always map child vp stats pages regardless of scheduler type drivers/hv/Makefile | 1 + drivers/hv/mshv_debugfs.c | 1103 ++++++++++++++++++++++++++++++++ drivers/hv/mshv_root.h | 49 +- drivers/hv/mshv_root_hv_call.c | 64 +- drivers/hv/mshv_root_main.c | 130 ++-- include/hyperv/hvhdk.h | 437 +++++++++++++ 6 files changed, 1721 insertions(+), 63 deletions(-) create mode 100644 drivers/hv/mshv_debugfs.c -- 2.34.1