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 7D1921C2DB2; Fri, 29 Aug 2025 00:43:56 +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=1756428237; cv=none; b=IdLTT4WaMBjsivsHUK1xyr+DahgqS419Zc0+5z1IrkCCBqbp1h34R3TmNOUE5WBRSt4pk3LlV53todB0apTNIFoX49NxQGNTx1aKiGHh6eD47xk/w7bUJVtQMZ3ID4vYer/0uVedHoYDUnNdb+nzl/AwNL/Pefxlqlzx3sfpEZw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756428237; c=relaxed/simple; bh=cGLz6masQCHPzXFZiijiETIRFdxtVgkLlgMyR1xHjzU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=HQWhgv5Gf4npcym4RECRuzMR15HYeaUlunT3CKCwV4ySrquJoVbal2h89QKVFQzzF5HJZztp2gZ4IB1BAqImEmPYZAAhy0GS8tNNZmwYoqMrb9CeTlVEV0Mg4SYWvwUq60mJKaGpBtGVJgoYXNiusdWE1+mh4NgBVoCZNi7xgU0= 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=S02XrYNT; 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="S02XrYNT" Received: by linux.microsoft.com (Postfix, from userid 1032) id 31BAA211081A; Thu, 28 Aug 2025 17:43:56 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 31BAA211081A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1756428236; bh=VhpuWdBSJ3WZBkJsf9ecfjzZYk1xDVSwNpg0AI8FOoE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S02XrYNTunHU09V+hCPffoRxJqcUkAcFqbPG1MziRveGo3g+eyqSJR4hqMI0JfBXc NE8dvXCfGu/noc0ngmmrIg2UlxzlgPTzKBwfydDC2lG55nIlPSHh/C3P5p+nbqx1G9 Sr/FvmoMMm+Ov43ybBh9yUzCOdh8L1mjT/m8ioT4= From: Nuno Das Neves To: linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, mhklinux@outlook.com, decui@microsoft.com, paekkaladevi@linux.microsoft.com, Nuno Das Neves Subject: [PATCH 4/6] mshv: Get the vmm capabilities offered by the hypervisor Date: Thu, 28 Aug 2025 17:43:48 -0700 Message-Id: <1756428230-3599-5-git-send-email-nunodasneves@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1756428230-3599-1-git-send-email-nunodasneves@linux.microsoft.com> References: <1756428230-3599-1-git-send-email-nunodasneves@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: From: Purna Pavan Chandra Aekkaladevi Some newer hypervisor APIs are gated by feature bits in the so-called "vmm capabilities" partition property. Store the capabilities on mshv_root module init, using HVCALL_GET_PARTITION_PROPERTY_EX. Signed-off-by: Purna Pavan Chandra Aekkaladevi Signed-off-by: Nuno Das Neves --- drivers/hv/mshv_root.h | 1 + drivers/hv/mshv_root_main.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 29 insertions(+) diff --git a/drivers/hv/mshv_root.h b/drivers/hv/mshv_root.h index 4aeb03bea6b6..0cb1e2589fe1 100644 --- a/drivers/hv/mshv_root.h +++ b/drivers/hv/mshv_root.h @@ -178,6 +178,7 @@ struct mshv_root { struct hv_synic_pages __percpu *synic_pages; spinlock_t pt_ht_lock; DECLARE_HASHTABLE(pt_htable, MSHV_PARTITIONS_HASH_BITS); + struct hv_partition_property_vmm_capabilities vmm_caps; }; /* diff --git a/drivers/hv/mshv_root_main.c b/drivers/hv/mshv_root_main.c index 56ababab57ce..29f61ecc9771 100644 --- a/drivers/hv/mshv_root_main.c +++ b/drivers/hv/mshv_root_main.c @@ -2327,6 +2327,28 @@ static int __init mshv_root_partition_init(struct device *dev) return err; } +static int mshv_init_vmm_caps(struct device *dev) +{ + int ret; + + memset(&mshv_root.vmm_caps, 0, sizeof(mshv_root.vmm_caps)); + ret = hv_call_get_partition_property_ex(HV_PARTITION_ID_SELF, + HV_PARTITION_PROPERTY_VMM_CAPABILITIES, + 0, &mshv_root.vmm_caps, + sizeof(mshv_root.vmm_caps)); + + /* + * HV_PARTITION_PROPERTY_VMM_CAPABILITIES is not supported in + * older hyperv. Ignore the -EIO error code. + */ + if (ret && ret != -EIO) + return ret; + + dev_dbg(dev, "vmm_caps=0x%llx\n", mshv_root.vmm_caps.as_uint64[0]); + + return 0; +} + static int __init mshv_parent_partition_init(void) { int ret; @@ -2377,6 +2399,12 @@ static int __init mshv_parent_partition_init(void) if (ret) goto remove_cpu_state; + ret = mshv_init_vmm_caps(dev); + if (ret) { + dev_err(dev, "Failed to get VMM capabilities\n"); + goto exit_partition; + } + ret = mshv_irqfd_wq_init(); if (ret) goto exit_partition; -- 2.34.1