From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f179.google.com (mail-pf1-f179.google.com [209.85.210.179]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D8C7D335064 for ; Thu, 30 Jul 2026 20:11:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.179 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785442301; cv=none; b=Oq4W/jiDmWnFZvD9qR5cpDQ3LvjHhje6fPRddD7caVlQihSQ9kBoPGtYrYT+iu9fa5+bP+W688cPPdFNwUjJvMYVTc15FsenfhMKpiTQ8l/4EwfWC/YXlLkKiNj8SQQ/5mJx5vm2o1uZ+6uEdJGwAKYGIZCWeYDbvBXrykn/JdQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785442301; c=relaxed/simple; bh=kG0V+A0XD3vYLFfqsb3MVX9KgiOaGk9ZgE+CUb0lYYI=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=uqM5CkLRY3ssz/78wcCwkLzz0JcY4594jMbXAci+9wwniMTIZ+YWIgsvYK9imVDwu2X85pppKxgjzk65BJjxKT2YGBgS8jJZWZ5HeJbS0Xow3lRt4z+UHeUEyx5mW+Mz8lv79ezLJco2W6XiO5WZ8yLg7ayNP5RvZ73v0u32+ZM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=XuOVa+dM; arc=none smtp.client-ip=209.85.210.179 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="XuOVa+dM" Received: by mail-pf1-f179.google.com with SMTP id d2e1a72fcca58-84874b52eabso458508b3a.0 for ; Thu, 30 Jul 2026 13:11:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1785442293; x=1786047093; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:reply-to:message-id:date :subject:cc:to:from:from:to:cc:subject:date:message-id:reply-to :content-type; bh=yHhFvDLdT6/nmSmrERMl9Q942exbwnTVnKlPTxRQFfM=; b=XuOVa+dMzlyDnn1BPSEEkX8oQBMdZwJU3JHkj7ujkeimyVzNW4XtIL0ta4GZOCF5WQ TqoPWfhu3/KDNjOZuh6sgU45OT2fh6REyZTbi9wdDzAm9GPFSdN63bpGnNu68Q5ekCsG VXXAmaXJncYUeWavSekd2+APgLcqTC21lnBfWVigp3euL/NYsJeU8+5+dV41bWusPaUQ qfp0hlMBpS72XQd9F4YNNdLna/zgBC5qAlUEXq8EAPy9OYQtlrtJOG7k/Erv/PcdZvL8 F0Z8s+vUf1qeQvqOvenlNMgXdVph70GggaKYJY16laaBcroDHt+CDCx+dVaubKYGXfRK k5dA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785442293; x=1786047093; h=content-transfer-encoding:mime-version:reply-to:message-id:date :subject:cc:to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to:content-type; bh=yHhFvDLdT6/nmSmrERMl9Q942exbwnTVnKlPTxRQFfM=; b=g2mjYp/c8hHf6+zRVGBCP4Ht5095pW8mOt2gytdbdcSwJUCJEyEzoilVh9qypu1/+k ipvaEkNYiDzINSyA3wiRLh1+lqs9rZbNzVnqjAlwTWvZ+qzruUKj8oLNzbjR/TdLkE26 bRXuHEcqHhOs+hNaHi+hzsQXS7Q6UtjclL498bBem4Xsf/9z6D1RGiTqUJPJk2gssa+X I81YffQr62zM1akjU9pCWAeGztKLD7mj1yeP31ZbggoKaHX0rjDPtebHTWv6o8uw/UeT 2uDug0IiFQQGU1asMeCJBsL5cw+ZLLC93pKckalylYM9fo04LiXdf5vpv3knE+k9quP5 DFlA== X-Forwarded-Encrypted: i=1; AHgh+RqChAcFbWglD6l6pVAJz5sA+YohssFZF3rdhFAh7KPqJLL8pSK2CBtC6wHin2unWDsIUb97RE0FYJWf@vger.kernel.org X-Gm-Message-State: AOJu0YyjRXN4CCqr3KZg0AAuN5FnOtkdSART1uzyFOG8CCsUWtBZgqqF FbJjmXMS6AxY60cHKX6sd0JurYo81qmylpNk5FtbnfZfiR1OukWkMLiU X-Gm-Gg: AR+sD11DkvOB4cx4N5Jokdrbx9Ato2DJq7/a3yH0hBjTnPSIn23meMAyG0oJ84x4Qk8 MMqBSVJuRbS8dEbHSQAuJ11HfXmjIP9eNl1nReApqCuJynaOlfVOp5W0k7IhshdbayWYBBFHbAa EM1x1Me+Xuh7SHGLmz7SEQP1ehd2+JDCeR/IFY8rbPZtGjndK7GScn7YKX6HjyAj0Rtf5IWn44W zxGnmxT6fmXqINKONzv31dYdxPbItnmm14u2xPIC7sZ7l0pG9QFO+axwiZRBTCAorLZ4R0zoXTs tC+CL0DyMnNLWywEEAPyKNuiE6tK7hpiYEfzvjA7ztXInUIqh55cVKHcrBuLRpIrKJ7Rm0uDLO4 LltldIKfIHU/vR4CsXZvhnDj1OmAa6JnhL6DvCKGSZ0ZUk9lT3zW8LXjVckPyLmItGID0+BslzQ NPJEw6L2HHRaCGXNR0Y8Yqx0qEKd9mJVKo1ISebyneHvsROeV4v8VV8/KWJDyECn/LrtJV3Y4M5 Bw+o+ZLFfNHlOeY5sYTGZGocdKpdQZ56oIbQ7S8JAM= X-Received: by 2002:a05:6a00:1150:b0:845:d284:9e0a with SMTP id d2e1a72fcca58-84ebc425164mr3944086b3a.49.1785442293425; Thu, 30 Jul 2026 13:11:33 -0700 (PDT) Received: from localhost.localdomain (c-174-165-208-10.hsd1.wa.comcast.net. [174.165.208.10]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84ea0055325sm3689108b3a.15.2026.07.30.13.11.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Jul 2026 13:11:32 -0700 (PDT) From: Michael Kelley X-Google-Original-From: Michael Kelley To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, daniel.lezcano@kernel.org, ssengar@linux.microsoft.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, James.Bottomley@HansenPartnership.com, martin.petersen@oracle.com, sgarzare@redhat.com, horms@kernel.org Cc: x86@kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, netdev@vger.kernel.org, linux-scsi@vger.kernel.org, virtualization@lists.linux.dev Subject: [RESEND PATCH 0/6] Remove support for Windows Server 2012/2012R2 & Win8/Win8.1 versions of Hyper-V Date: Thu, 30 Jul 2026 13:11:17 -0700 Message-Id: <20260730201123.1767-1-mhklinux@outlook.com> X-Mailer: git-send-email 2.25.1 Reply-To: mhklinux@outlook.com Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Linux code for running as a Hyper-V guest includes special cases for running on Hyper-V in WS2012/2012R2 and Windows 8/8.1. These versions were initially released 14 years ago, and official support ended in 2023 (unless a customer has contracted for extended security updates). Given the release of subsequent versions with improved functionality, there's no need to continue to support the latest Linux kernels on these versions of Hyper-V. If someone is running Linux on one of these older Hyper-V versions and doesn't want to upgrade, they can continue to do so as presumably they don't want upgrade the Linux version either. Simplify Linux code by removing special cases for running on these old versions of Hyper-V. This includes removing the negotiation of the VMBus protocol versions for WS2012/Win8, and the special case code based on those VMBus protocol versions. Changes are in the core VMBus code and several drivers for synthetic VMBus devices. Some VMBus drivers have device-specific protocols with the Hyper-V host. Further simplify the code by removing the use of protocol versions that are specific to WS2012/Win8 and earlier. Finally, the WS2012/Win8 versions of Hyper-V were the last to use messages to deliver synthetic timer interrupts. Starting in WS2016/Win10, stimer interrupts are delivered to their own assigned interrupt vector (called "Direct Mode"). So remove the code for handling timer interrupts delivered as messages. This removal has a broader benefit in removing a key blocker to disentangling VMBus code (which handles the messages) and stimer code, as they should be independent of each other. The final disentangling will come as a follow-on patch set. Testing: * VM on local Hyper-V on up-to-date Windows 11 * Added temp debug code to suppress Direct Mode enumeration. Fallback to LAPIC timer worked as expected (x86/x64 only) * Azure VM DC16eds v6: TDX CoCo VM with HvLite paravisor * Azure VM DC16ads v6: SEV-SNP VM with an older paravisor * Azure VM D16alds_v7: normal AMD x86 VM with HvLite paravisor * Azure VM D16plds v6: normal ARM64 VM with MSFT Cobalt processor * Not tested running in VTL2 There's no specific urgency to removing the special case code for WS2012/Win8, so if the broader Linux kernel community surfaces a reason why this clean-up should not be done now, we can wait. But I think we want to eventually stop carrying around this extra baggage, and based on discussions with the Hyper-V team within Microsoft, we're past the point that it has any value. Michael Kelley (6): Drivers: hv: Remove support for WS2012/2012R2 & Win8/8.1 version of Hyper-V hv_sock: Remove check for old Hyper-V hosts hv_netvsc: Remove GPADL teardown special case for old Hyper-V hosts drm_hyperv: Remove support for synth video protocol of old Hyper-V hosts scsi: storvsc: Remove support for storvsc protocol of old Hyper-V hosts clocksource: hyper-v: Remove support for stimer interrupts in message mode arch/x86/hyperv/hv_init.c | 17 +-- arch/x86/kernel/cpu/mshyperv.c | 4 +- drivers/clocksource/hyperv_timer.c | 150 +++------------------- drivers/gpu/drm/hyperv/hyperv_drm_proto.c | 33 ++--- drivers/hv/channel_mgmt.c | 4 - drivers/hv/connection.c | 8 +- drivers/hv/hv.c | 4 - drivers/hv/hv_balloon.c | 36 +++--- drivers/hv/hv_snapshot.c | 5 - drivers/hv/vmbus_drv.c | 10 +- drivers/net/hyperv/netvsc.c | 20 +-- drivers/scsi/storvsc_drv.c | 53 ++------ include/clocksource/hyperv_timer.h | 6 - include/linux/hyperv.h | 5 +- net/vmw_vsock/hyperv_transport.c | 3 - 15 files changed, 76 insertions(+), 282 deletions(-) -- 2.25.1