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b=wHERLLjV/5ddXedZDqi9vbg+MV5lvl3iHVI1uNhn3eCX1qkjkJv5cM9tbT/7fpiWaj/4uu63aALcUAztswMvleM2wCs9ucKpOEmvTboqDHVpd9SVC7wIfUlD9g2JT7armOt5JwOOOyBMDQF7GbT5cucyBJ7Mmnr+Agft69RsgeIsiJmxFTdbKXiez6egPDIlBOXXobUn7VqrCuxnA6uE4IQv6aPXzA/bLTSVKVWq0OWWHemKB7DNeu/qzn8X4WYNRm5L75Kaq828xK6l4K/UW1tbnltt8fzYOgFFjqD0MBIKAZrtT3qmmOIaoUQ1ljCvbOGDyaEHpPDNbQxQLewSEA== From: John Levon To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , John Levon , Thanos Makatos , Paolo Bonzini , Alex Williamson , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , John Johnson , Elena Ufimtseva , Jagannathan Raman Subject: [PATCH v5 05/19] vfio-user: implement VFIO_USER_DEVICE_GET_INFO Date: Wed, 25 Jun 2025 20:29:57 +0100 Message-ID: <20250625193012.2316242-6-john.levon@nutanix.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250625193012.2316242-1-john.levon@nutanix.com> References: <20250625193012.2316242-1-john.levon@nutanix.com> Content-Type: text/plain; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=148.163.155.12; envelope-from=john.levon@nutanix.com; helo=mx0b-002c1b01.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @nutanix.com) X-ZM-MESSAGEID: 1750880103045116600 Add support for getting basic device information. Originally-by: John Johnson Signed-off-by: Elena Ufimtseva Signed-off-by: Jagannathan Raman Signed-off-by: John Levon Reviewed-by: C=C3=A9dric Le Goater --- hw/vfio-user/device.h | 20 ++++++++++++++ hw/vfio-user/protocol.h | 12 +++++++++ hw/vfio-user/proxy.h | 7 +++++ hw/vfio-user/container.c | 8 +++++- hw/vfio-user/device.c | 55 +++++++++++++++++++++++++++++++++++++++ hw/vfio-user/proxy.c | 10 +++---- hw/vfio-user/meson.build | 1 + hw/vfio-user/trace-events | 1 + 8 files changed, 107 insertions(+), 7 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..ef3f71ee69 --- /dev/null +++ b/hw/vfio-user/device.h @@ -0,0 +1,20 @@ +#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. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" +#include "linux/vfio.h" + +#include "hw/vfio-user/proxy.h" + +bool vfio_user_get_device_info(VFIOUserProxy *proxy, + struct vfio_device_info *info, Error **errp= ); + +#endif /* VFIO_USER_DEVICE_H */ diff --git a/hw/vfio-user/protocol.h b/hw/vfio-user/protocol.h index 2d52d0fb10..e0bba68739 100644 --- a/hw/vfio-user/protocol.h +++ b/hw/vfio-user/protocol.h @@ -112,4 +112,16 @@ 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 5bc890a0f5..837b02a8c4 100644 --- a/hw/vfio-user/proxy.h +++ b/hw/vfio-user/proxy.h @@ -12,7 +12,9 @@ #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 { @@ -96,4 +98,9 @@ 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); +bool vfio_user_send_wait(VFIOUserProxy *proxy, VFIOUserHdr *hdr, + VFIOUserFDs *fds, int rsize, Error **errp); + #endif /* VFIO_USER_PROXY_H */ diff --git a/hw/vfio-user/container.c b/hw/vfio-user/container.c index 2367332177..f5bfd54316 100644 --- a/hw/vfio-user/container.c +++ b/hw/vfio-user/container.c @@ -11,6 +11,7 @@ #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" @@ -140,7 +141,12 @@ 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) }; + + + if (!vfio_user_get_device_info(vbasedev->proxy, &info, errp)) { + return false; + } =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..4212fefd44 --- /dev/null +++ b/hw/vfio-user/device.c @@ -0,0 +1,55 @@ +/* + * vfio protocol over a UNIX socket device handling. + * + * Copyright =C2=A9 2018, 2021 Oracle and/or its affiliates. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" +#include "qapi/error.h" +#include "qemu/error-report.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 + +bool vfio_user_get_device_info(VFIOUserProxy *proxy, + struct vfio_device_info *info, Error **errp) +{ + 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; + + if (!vfio_user_send_wait(proxy, &msg.hdr, NULL, 0, errp)) { + return false; + } + + if (msg.hdr.flags & VFIO_USER_ERROR) { + error_setg_errno(errp, -msg.hdr.error_reply, + "VFIO_USER_DEVICE_GET_INFO failed"); + return false; + } + + 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_setg_errno(errp, EINVAL, "invalid reply"); + return false; + } + + return true; +} diff --git a/hw/vfio-user/proxy.c b/hw/vfio-user/proxy.c index 874142e9e5..aed7b22e2a 100644 --- a/hw/vfio-user/proxy.c +++ b/hw/vfio-user/proxy.c @@ -35,8 +35,6 @@ static void vfio_user_send(void *opaque); static void vfio_user_cb(void *opaque); =20 static void vfio_user_request(void *opaque); -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) { @@ -626,8 +624,8 @@ static bool vfio_user_send_queued(VFIOUserProxy *proxy,= VFIOUserMsg *msg, * * In either case, the caller must free @hdr and @fds if needed. */ -static bool vfio_user_send_wait(VFIOUserProxy *proxy, VFIOUserHdr *hdr, - VFIOUserFDs *fds, int rsize, Error **errp) +bool vfio_user_send_wait(VFIOUserProxy *proxy, VFIOUserHdr *hdr, + VFIOUserFDs *fds, int rsize, Error **errp) { VFIOUserMsg *msg; bool ok =3D false; @@ -802,8 +800,8 @@ 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 9e85a8ea51..2ed0ae5b1d 100644 --- a/hw/vfio-user/meson.build +++ b/hw/vfio-user/meson.build @@ -3,6 +3,7 @@ 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 a965c7b1f2..b7312d6d59 100644 --- a/hw/vfio-user/trace-events +++ b/hw/vfio-user/trace-events @@ -8,3 +8,4 @@ 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