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Tsirkin" , Thanos Makatos , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , John Johnson , Elena Ufimtseva , Jagannathan Raman Subject: [PATCH v2 16/29] vfio-user: implement VFIO_USER_DEVICE_GET_INFO Date: Tue, 20 May 2025 16:04:05 +0100 Message-ID: <20250520150419.2172078-17-john.levon@nutanix.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250520150419.2172078-1-john.levon@nutanix.com> References: <20250520150419.2172078-1-john.levon@nutanix.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: AM9P193CA0021.EURP193.PROD.OUTLOOK.COM (2603:10a6:20b:21e::26) To CH2PR02MB6760.namprd02.prod.outlook.com (2603:10b6:610:7f::9) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PR02MB6760:EE_|SA1PR02MB8462:EE_ X-MS-Office365-Filtering-Correlation-Id: d2d93259-3e56-4f01-9444-08dd97afb3b9 x-proofpoint-crosstenant: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014|7416014; 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Originally-by: John Johnson Signed-off-by: Elena Ufimtseva Signed-off-by: Jagannathan Raman Signed-off-by: John Levon --- hw/vfio-user/device.h | 23 ++++++++++++++++++ hw/vfio-user/protocol.h | 12 ++++++++++ hw/vfio-user/proxy.h | 7 ++++++ hw/vfio-user/container.c | 10 +++++++- hw/vfio-user/device.c | 50 +++++++++++++++++++++++++++++++++++++++ hw/vfio-user/proxy.c | 12 ++++------ hw/vfio-user/meson.build | 1 + hw/vfio-user/trace-events | 1 + 8 files changed, 107 insertions(+), 9 deletions(-) create mode 100644 hw/vfio-user/device.h create mode 100644 hw/vfio-user/device.c diff --git a/hw/vfio-user/device.h b/hw/vfio-user/device.h new file mode 100644 index 0000000000..f27f26b479 --- /dev/null +++ b/hw/vfio-user/device.h @@ -0,0 +1,23 @@ +#ifndef VFIO_USER_DEVICE_H +#define VFIO_USER_DEVICE_H + +/* + * vfio protocol over a UNIX socket device handling. + * + * Copyright =C2=A9 2018, 2021 Oracle and/or its affiliates. + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" +#include "linux/vfio.h" + +#include "hw/vfio-user/proxy.h" + +int vfio_user_get_device_info(VFIOUserProxy *proxy, + struct vfio_device_info *info); + +#endif /* VFIO_USER_DEVICE_H */ diff --git a/hw/vfio-user/protocol.h b/hw/vfio-user/protocol.h index 74ea2a94e6..648badff46 100644 --- a/hw/vfio-user/protocol.h +++ b/hw/vfio-user/protocol.h @@ -115,4 +115,16 @@ typedef struct { */ #define VFIO_USER_DEF_MAX_BITMAP (256 * 1024 * 1024) =20 +/* + * VFIO_USER_DEVICE_GET_INFO + * imported from struct vfio_device_info + */ +typedef struct { + VFIOUserHdr hdr; + uint32_t argsz; + uint32_t flags; + uint32_t num_regions; + uint32_t num_irqs; +} VFIOUserDeviceInfo; + #endif /* VFIO_USER_PROTOCOL_H */ diff --git a/hw/vfio-user/proxy.h b/hw/vfio-user/proxy.h index 33e8a4d83b..9c6b2cdf35 100644 --- a/hw/vfio-user/proxy.h +++ b/hw/vfio-user/proxy.h @@ -15,7 +15,9 @@ #include "io/channel.h" #include "io/channel-socket.h" =20 +#include "qemu/queue.h" #include "qemu/sockets.h" +#include "qemu/thread.h" #include "hw/vfio-user/protocol.h" =20 typedef struct { @@ -99,4 +101,9 @@ void vfio_user_set_handler(VFIODevice *vbasedev, void *reqarg); bool vfio_user_validate_version(VFIOUserProxy *proxy, Error **errp); =20 +void vfio_user_request_msg(VFIOUserHdr *hdr, uint16_t cmd, + uint32_t size, uint32_t flags); +void vfio_user_send_wait(VFIOUserProxy *proxy, VFIOUserHdr *hdr, + VFIOUserFDs *fds, int rsize); + #endif /* VFIO_USER_PROXY_H */ diff --git a/hw/vfio-user/container.c b/hw/vfio-user/container.c index 2892845b4f..6f0eb86a75 100644 --- a/hw/vfio-user/container.c +++ b/hw/vfio-user/container.c @@ -14,6 +14,7 @@ #include "qemu/osdep.h" =20 #include "hw/vfio-user/container.h" +#include "hw/vfio-user/device.h" #include "hw/vfio/vfio-cpr.h" #include "hw/vfio/vfio-device.h" #include "hw/vfio/vfio-listener.h" @@ -144,7 +145,14 @@ static void vfio_user_container_disconnect(VFIOUserCon= tainer *container) static bool vfio_user_device_get(VFIOUserContainer *container, VFIODevice *vbasedev, Error **errp) { - struct vfio_device_info info =3D { 0 }; + struct vfio_device_info info =3D { .argsz =3D sizeof(info) }; + int ret; + + ret =3D vfio_user_get_device_info(vbasedev->proxy, &info); + if (ret) { + error_setg_errno(errp, -ret, "get info failure"); + return ret; + } =20 vbasedev->fd =3D -1; =20 diff --git a/hw/vfio-user/device.c b/hw/vfio-user/device.c new file mode 100644 index 0000000000..e081033ff1 --- /dev/null +++ b/hw/vfio-user/device.c @@ -0,0 +1,50 @@ +/* + * vfio protocol over a UNIX socket device handling. + * + * Copyright =C2=A9 2018, 2021 Oracle and/or its affiliates. + * + * This work is licensed under the terms of the GNU GPL, version 2 or late= r. + * See the COPYING file in the top-level directory. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" + +#include "hw/vfio-user/device.h" +#include "hw/vfio-user/trace.h" + +/* + * These are to defend against a malign server trying + * to force us to run out of memory. + */ +#define VFIO_USER_MAX_REGIONS 100 +#define VFIO_USER_MAX_IRQS 50 + +int vfio_user_get_device_info(VFIOUserProxy *proxy, + struct vfio_device_info *info) +{ + VFIOUserDeviceInfo msg; + uint32_t argsz =3D sizeof(msg) - sizeof(msg.hdr); + + memset(&msg, 0, sizeof(msg)); + vfio_user_request_msg(&msg.hdr, VFIO_USER_DEVICE_GET_INFO, sizeof(msg)= , 0); + msg.argsz =3D argsz; + + vfio_user_send_wait(proxy, &msg.hdr, NULL, 0); + if (msg.hdr.flags & VFIO_USER_ERROR) { + return -msg.hdr.error_reply; + } + trace_vfio_user_get_info(msg.num_regions, msg.num_irqs); + + memcpy(info, &msg.argsz, argsz); + + /* defend against a malicious server */ + if (info->num_regions > VFIO_USER_MAX_REGIONS || + info->num_irqs > VFIO_USER_MAX_IRQS) { + error_printf("%s: invalid reply\n", __func__); + return -EINVAL; + } + + return 0; +} diff --git a/hw/vfio-user/proxy.c b/hw/vfio-user/proxy.c index 0bc12da865..34df9bba7b 100644 --- a/hw/vfio-user/proxy.c +++ b/hw/vfio-user/proxy.c @@ -42,10 +42,6 @@ static void vfio_user_cb(void *opaque); =20 static void vfio_user_request(void *opaque); static int vfio_user_send_queued(VFIOUserProxy *proxy, VFIOUserMsg *msg); -static void vfio_user_send_wait(VFIOUserProxy *proxy, VFIOUserHdr *hdr, - VFIOUserFDs *fds, int rsize); -static void vfio_user_request_msg(VFIOUserHdr *hdr, uint16_t cmd, - uint32_t size, uint32_t flags); =20 static inline void vfio_user_set_error(VFIOUserHdr *hdr, uint32_t err) { @@ -613,8 +609,8 @@ static int vfio_user_send_queued(VFIOUserProxy *proxy, = VFIOUserMsg *msg) return 0; } =20 -static void vfio_user_send_wait(VFIOUserProxy *proxy, VFIOUserHdr *hdr, - VFIOUserFDs *fds, int rsize) +void vfio_user_send_wait(VFIOUserProxy *proxy, VFIOUserHdr *hdr, + VFIOUserFDs *fds, int rsize) { VFIOUserMsg *msg; int ret; @@ -785,8 +781,8 @@ void vfio_user_disconnect(VFIOUserProxy *proxy) g_free(proxy); } =20 -static void vfio_user_request_msg(VFIOUserHdr *hdr, uint16_t cmd, - uint32_t size, uint32_t flags) +void vfio_user_request_msg(VFIOUserHdr *hdr, uint16_t cmd, + uint32_t size, uint32_t flags) { static uint16_t next_id; =20 diff --git a/hw/vfio-user/meson.build b/hw/vfio-user/meson.build index 695b341547..19bdee688c 100644 --- a/hw/vfio-user/meson.build +++ b/hw/vfio-user/meson.build @@ -1,6 +1,7 @@ vfio_user_ss =3D ss.source_set() vfio_user_ss.add(files( 'container.c', + 'device.c', 'pci.c', 'proxy.c', )) diff --git a/hw/vfio-user/trace-events b/hw/vfio-user/trace-events index 7a3645024f..6b06a3ed82 100644 --- a/hw/vfio-user/trace-events +++ b/hw/vfio-user/trace-events @@ -6,3 +6,4 @@ vfio_user_recv_read(uint16_t id, int read) " id 0x%x read 0= x%x" vfio_user_recv_request(uint16_t cmd) " command 0x%x" vfio_user_send_write(uint16_t id, int wrote) " id 0x%x wrote 0x%x" vfio_user_version(uint16_t major, uint16_t minor, const char *caps) " majo= r %d minor %d caps: %s" +vfio_user_get_info(uint32_t nregions, uint32_t nirqs) " #regions %d #irqs = %d" --=20 2.43.0