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 74DFF37EFFB; Fri, 7 Aug 2026 13:52:28 +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=1786110752; cv=none; b=KyQdqkzhrckFsHQ3+97A9D8n3EY0z69Gc3id2gZ4XNf2QrpyqUTxLOQKhvpEObjMD24wzjTbQQgpmDnAjTqG44g5L1oAApf9TIH6Vzj6wqHNx6yvIEpeecFHTsEKsU/FZ357+DVSr4SDANlO68JOlp9gSsgnPK8gZOAAq236zik= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786110752; c=relaxed/simple; bh=frllaI5tsxgfp+bUAFqL0v4ITYGScd38bnMkMuOa4VE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qzStNsmbIAwCSo1CODVs2Fmk1ctcvGLhpbnAit+cE66kPsWq+7m/9C1QWJk+GbuC7fxxGj0u1poAN+T+0BoFeGylhU0YFVPB91sF/kUogr7zjWzCVlCfUyHi+5x6vNQ0qp6IAqfIHelnfLFR/P0nvqVIq0M4F+p8jLYqrAWmqSk= 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=MPSL9Jpt; 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="MPSL9Jpt" Received: from weh-cvm-dev-vm.y50bckvjo0hefgfnzfztsfttff.phxx.internal.cloudapp.net (unknown [20.169.55.37]) by linux.microsoft.com (Postfix) with ESMTPSA id C4CE620B712B; Fri, 7 Aug 2026 06:52:04 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com C4CE620B712B DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1786110725; bh=01mdhBVpJHKCXHrK95ywSkUJgVZwzJ8UGAuHPxA8gU8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MPSL9JptpzYyDrI+iftRxT3N0nLyLG9TqUUr1upYrr0AOuiG9cT80vt6URXjHHhX+ 2Ie/xlYL+qpcfNtcvtUX7u6BJiEfZq44Y9Kp8ww0J4LgfnTMepcyV4sR3OVLCmX2OD s7z8Wk8Q1c3di2Ay23XqdG9pMdLA6Fqmt92VoHrw= From: Wei Hu To: linux-hyperv@vger.kernel.org Cc: linux-kernel@vger.kernel.org, "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li Subject: [PATCH v1 08/13] mshv: accept partial CPU feature banks Date: Fri, 7 Aug 2026 13:51:14 +0000 Message-ID: <20260807135134.303943-9-weh@linux.microsoft.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260807135134.303943-1-weh@linux.microsoft.com> References: <20260807135134.303943-1-weh@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Wei Liu Allow userspace to provide fewer than MSHV_NUM_CPU_FEATURES_BANKS banks for the create-partition v2 ioctl. Preserve the default disabled-feature mask for omitted banks instead of rejecting the ioctl or overwriting all banks. Signed-off-by: Wei Liu --- drivers/hv/mshv_root_main.c | 12 ++---------- include/uapi/linux/mshv.h | 3 ++- 2 files changed, 4 insertions(+), 11 deletions(-) diff --git a/drivers/hv/mshv_root_main.c b/drivers/hv/mshv_root_main.c index 11d3c86050b4..729916e1eacf 100644 --- a/drivers/hv/mshv_root_main.c +++ b/drivers/hv/mshv_root_main.c @@ -2423,20 +2423,12 @@ static long mshv_ioctl_process_pt_flags(void __user *user_arg, u64 *pt_flags, args.pt_isolation >= MSHV_PT_ISOLATION_COUNT) return -EINVAL; - if (args.pt_num_cpu_fbanks != MSHV_NUM_CPU_FEATURES_BANKS || + if (args.pt_num_cpu_fbanks > MSHV_NUM_CPU_FEATURES_BANKS || mshv_field_nonzero(args, pt_rsvd) || mshv_field_nonzero(args, pt_rsvd1)) return -EINVAL; - /* - * Note this assumes MSHV_NUM_CPU_FEATURES_BANKS will never - * change and equals HV_PARTITION_PROCESSOR_FEATURES_BANKS - * (i.e. 2). - * - * Further banks (index >= 2) will be modifiable as 'early' - * properties via the set partition property hypercall. - */ - for (i = 0; i < HV_PARTITION_PROCESSOR_FEATURES_BANKS; i++) + for (i = 0; i < args.pt_num_cpu_fbanks; i++) disabled_procs->as_uint64[i] = args.pt_cpu_fbanks[i]; #if IS_ENABLED(CONFIG_X86_64) diff --git a/include/uapi/linux/mshv.h b/include/uapi/linux/mshv.h index 4e7f3038f0c6..6d6e0fda63bd 100644 --- a/include/uapi/linux/mshv.h +++ b/include/uapi/linux/mshv.h @@ -66,7 +66,8 @@ struct mshv_create_partition { * This is extended version of the above initial MSHV_CREATE_PARTITION * ioctl and allows for following additional parameters: * - * @pt_num_cpu_fbanks: Must be set to MSHV_NUM_CPU_FEATURES_BANKS. + * @pt_num_cpu_fbanks: Number of processor feature banks provided. Must not + * exceed MSHV_NUM_CPU_FEATURES_BANKS. * @pt_cpu_fbanks: Disabled processor feature banks array. * @pt_disabled_xsave: Disabled xsave feature bits. * -- 2.43.0