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 0C5D823B612; Mon, 14 Jul 2025 22:15:47 +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=1752531349; cv=none; b=UQ1NemTNyCTuPLkaYngPeVD4fVrutDKHtsLdOdzFSoJ6PZBY0Jy8ullz1vZ7tIbPcdFyVVbT2xZCoumf0rWNsBFWjP13BVkx00PZ/0Ssja5cWwJEhQcXkemvg+ngvAkK+rF2FNkHs4j7uX+gRXZ8SU/aLtldBlyXVr11jOBaPXU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752531349; c=relaxed/simple; bh=GTK18SURi9MA5ksujzeL6uPXXJfV//F86xAT4KJw1w0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sUPwRVgjyvqCAmvkwMXEtdjUit/snv4mOjsuRRbyn1x9Dwt2ULWp5qH43F832qTX/CRPqX1PF/itCw+ehskylFiXm87tBE0lZ6Fo0xyU7AcKPmcdCnCKIJ8xw8r1l8MRc8GUEvPvkQzxYYfNxNZRzfknMJZCnwag53H5+ISaAD0= 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=AsyujSpT; 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="AsyujSpT" Received: from romank-3650.corp.microsoft.com (unknown [131.107.160.188]) by linux.microsoft.com (Postfix) with ESMTPSA id 7BBD2201657B; Mon, 14 Jul 2025 15:15:47 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 7BBD2201657B DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1752531347; bh=VgkiizYMYF32uIO8lHFpO+dEsSl9O3ZuABsDjADOcUg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AsyujSpT3otIpHQWCWxTkSJrcOjjmtrRM6gLCswK4LoeaZxTryv7wwmW9jDUJhZP4 P4BsB3c63tmyxaRv2id2SjkR6JU0o+vSB0qroU2zE3l4HtxsCB55aN6V7vlNDboZ2y EYlYgdkzaZfhDTivIxgl53vTOjO6bZj55e9tn5uA= From: Roman Kisel To: alok.a.tiwari@oracle.com, arnd@arndb.de, bp@alien8.de, corbet@lwn.net, dave.hansen@linux.intel.com, decui@microsoft.com, haiyangz@microsoft.com, hpa@zytor.com, kys@microsoft.com, mhklinux@outlook.com, mingo@redhat.com, rdunlap@infradead.org, tglx@linutronix.de, Tianyu.Lan@microsoft.com, wei.liu@kernel.org, linux-arch@vger.kernel.org, linux-coco@lists.linux.dev, linux-doc@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org Cc: apais@microsoft.com, benhill@microsoft.com, bperkins@microsoft.com, sunilmut@microsoft.com Subject: [PATCH hyperv-next v4 02/16] drivers: hv: VMBus protocol version 6.0 Date: Mon, 14 Jul 2025 15:15:31 -0700 Message-ID: <20250714221545.5615-3-romank@linux.microsoft.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250714221545.5615-1-romank@linux.microsoft.com> References: <20250714221545.5615-1-romank@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The confidential VMBus is supported starting from the protocol version 6.0 onwards. Update the relevant definitions, and provide a function that returns whether VMBus is confidential or not. No functional changes. Signed-off-by: Roman Kisel Reviewed-by: Alok Tiwari --- drivers/hv/vmbus_drv.c | 12 ++++++ include/asm-generic/mshyperv.h | 1 + include/linux/hyperv.h | 69 ++++++++++++++++++++++++---------- 3 files changed, 63 insertions(+), 19 deletions(-) diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 33b524b4eb5e..698c86c4ef03 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -56,6 +56,18 @@ static long __percpu *vmbus_evt; int vmbus_irq; int vmbus_interrupt; +/* + * If the Confidential VMBus is used, the data on the "wire" is not + * visible to either the host or the hypervisor. + */ +static bool is_confidential; + +bool vmbus_is_confidential(void) +{ + return is_confidential; +} +EXPORT_SYMBOL_GPL(vmbus_is_confidential); + /* * The panic notifier below is responsible solely for unloading the * vmbus connection, which is necessary in a panic event. diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index a729b77983fa..9722934a8332 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -373,6 +373,7 @@ static inline int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u3 return -EOPNOTSUPP; } #endif /* CONFIG_MSHV_ROOT */ +bool vmbus_is_confidential(void); #if IS_ENABLED(CONFIG_HYPERV_VTL_MODE) u8 __init get_vtl(void); diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index a59c5c3e95fb..a1820fabbfc0 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -265,16 +265,18 @@ static inline u32 hv_get_avail_to_write_percent( * Linux kernel. */ -#define VERSION_WS2008 ((0 << 16) | (13)) -#define VERSION_WIN7 ((1 << 16) | (1)) -#define VERSION_WIN8 ((2 << 16) | (4)) -#define VERSION_WIN8_1 ((3 << 16) | (0)) -#define VERSION_WIN10 ((4 << 16) | (0)) -#define VERSION_WIN10_V4_1 ((4 << 16) | (1)) -#define VERSION_WIN10_V5 ((5 << 16) | (0)) -#define VERSION_WIN10_V5_1 ((5 << 16) | (1)) -#define VERSION_WIN10_V5_2 ((5 << 16) | (2)) -#define VERSION_WIN10_V5_3 ((5 << 16) | (3)) +#define VMBUS_MAKE_VERSION(MAJ, MIN) ((((u32)MAJ) << 16) | (MIN)) +#define VERSION_WS2008 VMBUS_MAKE_VERSION(0, 13) +#define VERSION_WIN7 VMBUS_MAKE_VERSION(1, 1) +#define VERSION_WIN8 VMBUS_MAKE_VERSION(2, 4) +#define VERSION_WIN8_1 VMBUS_MAKE_VERSION(3, 0) +#define VERSION_WIN10 VMBUS_MAKE_VERSION(4, 0) +#define VERSION_WIN10_V4_1 VMBUS_MAKE_VERSION(4, 1) +#define VERSION_WIN10_V5 VMBUS_MAKE_VERSION(5, 0) +#define VERSION_WIN10_V5_1 VMBUS_MAKE_VERSION(5, 1) +#define VERSION_WIN10_V5_2 VMBUS_MAKE_VERSION(5, 2) +#define VERSION_WIN10_V5_3 VMBUS_MAKE_VERSION(5, 3) +#define VERSION_WIN10_V6_0 VMBUS_MAKE_VERSION(6, 0) /* Make maximum size of pipe payload of 16K */ #define MAX_PIPE_DATA_PAYLOAD (sizeof(u8) * 16384) @@ -335,14 +337,22 @@ struct vmbus_channel_offer { } __packed; /* Server Flags */ -#define VMBUS_CHANNEL_ENUMERATE_DEVICE_INTERFACE 1 -#define VMBUS_CHANNEL_SERVER_SUPPORTS_TRANSFER_PAGES 2 -#define VMBUS_CHANNEL_SERVER_SUPPORTS_GPADLS 4 -#define VMBUS_CHANNEL_NAMED_PIPE_MODE 0x10 -#define VMBUS_CHANNEL_LOOPBACK_OFFER 0x100 -#define VMBUS_CHANNEL_PARENT_OFFER 0x200 -#define VMBUS_CHANNEL_REQUEST_MONITORED_NOTIFICATION 0x400 -#define VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER 0x2000 +#define VMBUS_CHANNEL_ENUMERATE_DEVICE_INTERFACE 0x0001 +/* + * This flag indicates that the channel is offered by the paravisor, and must + * use encrypted memory for the channel ring buffer. + */ +#define VMBUS_CHANNEL_CONFIDENTIAL_RING_BUFFER 0x0002 +/* + * This flag indicates that the channel is offered by the paravisor, and must + * use encrypted memory for GPA direct packets and additional GPADLs. + */ +#define VMBUS_CHANNEL_CONFIDENTIAL_EXTERNAL_MEMORY 0x0004 +#define VMBUS_CHANNEL_NAMED_PIPE_MODE 0x0010 +#define VMBUS_CHANNEL_LOOPBACK_OFFER 0x0100 +#define VMBUS_CHANNEL_PARENT_OFFER 0x0200 +#define VMBUS_CHANNEL_REQUEST_MONITORED_NOTIFICATION 0x0400 +#define VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER 0x2000 struct vmpacket_descriptor { u16 type; @@ -621,6 +631,12 @@ struct vmbus_channel_relid_released { u32 child_relid; } __packed; +/* + * Used by the paravisor only, means that the encrypted ring buffers and + * the encrypted external memory are supported + */ +#define VMBUS_FEATURE_FLAG_CONFIDENTIAL_CHANNELS 0x10 + struct vmbus_channel_initiate_contact { struct vmbus_channel_message_header header; u32 vmbus_version_requested; @@ -630,7 +646,8 @@ struct vmbus_channel_initiate_contact { struct { u8 msg_sint; u8 msg_vtl; - u8 reserved[6]; + u8 reserved[2]; + u32 feature_flags; /* VMBus version 6.0 */ }; }; u64 monitor_page1; @@ -1008,6 +1025,10 @@ struct vmbus_channel { /* boolean to control visibility of sysfs for ring buffer */ bool ring_sysfs_visible; + /* The ring buffer is encrypted */ + bool co_ring_buffer; + /* The external memory is encrypted */ + bool co_external_memory; }; #define lock_requestor(channel, flags) \ @@ -1032,6 +1053,16 @@ u64 vmbus_request_addr_match(struct vmbus_channel *channel, u64 trans_id, u64 rqst_addr); u64 vmbus_request_addr(struct vmbus_channel *channel, u64 trans_id); +static inline bool is_co_ring_buffer(const struct vmbus_channel_offer_channel *o) +{ + return !!(o->offer.chn_flags & VMBUS_CHANNEL_CONFIDENTIAL_RING_BUFFER); +} + +static inline bool is_co_external_memory(const struct vmbus_channel_offer_channel *o) +{ + return !!(o->offer.chn_flags & VMBUS_CHANNEL_CONFIDENTIAL_EXTERNAL_MEMORY); +} + static inline bool is_hvsock_offer(const struct vmbus_channel_offer_channel *o) { return !!(o->offer.chn_flags & VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER); -- 2.43.0