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Mon, 24 Feb 2020 20:56:21 +0000 Received: from abhmp0010.oracle.com (abhmp0010.oracle.com [141.146.116.16]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 01OKuJID028381; Mon, 24 Feb 2020 20:56:19 GMT Received: from jaraman-bur-1.us.oracle.com (/10.152.33.39) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 24 Feb 2020 12:56:19 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : in-reply-to : references; s=corp-2020-01-29; bh=WI0VOS/0TodogycTzWpFogQfyyLICEWu1pdK8KJq5vc=; b=wC4sjwpxSTH4HNqJS2pILuBIKxeWO/pWpGrljh0XE96gjf37vdS3MhezAebpGORFYylp epk8rOrp/NkYlXHf9RLBhiZp9RjJfqOJARgLdaDQ1N8TdbcYTY2925vJPAiHmX1/YofZ FqwUQ1IyRYvO3PwOgSSpjjVX/ViT68pemWX+O2xjuS1YiAiWJ+E5F8RPnMviTclpQsrZ HIQw+Lz0K11Eg+9fklHmDDRn/MPAnAfPsEMd8A1u6ZkkxuFlYDTohKAUK5Ru264YgD6u xEQJOTnhZDgnwS2Bem4Ort6vo9C9QUSIBm9WBFXI2Cs9zi7l+JhkW4eza9C6J5knj6lN TQ== From: Jagannathan Raman To: qemu-devel@nongnu.org Subject: [PATCH v5 15/50] multi-process: PCI BAR read/write handling for proxy & remote endpoints Date: Mon, 24 Feb 2020 15:55:06 -0500 Message-Id: <28d7426190d8a88c7b93f5f5daf8cd1c6e017a76.1582576372.git.jag.raman@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: References: In-Reply-To: References: X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9541 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 bulkscore=0 mlxscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002240153 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9541 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 impostorscore=0 lowpriorityscore=0 spamscore=0 clxscore=1015 suspectscore=1 bulkscore=0 mlxlogscore=999 malwarescore=0 phishscore=0 adultscore=0 priorityscore=1501 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002240153 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 156.151.31.85 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: elena.ufimtseva@oracle.com, fam@euphon.net, swapnil.ingle@nutanix.com, john.g.johnson@oracle.com, kraxel@redhat.com, jag.raman@oracle.com, quintela@redhat.com, mst@redhat.com, armbru@redhat.com, kanth.ghatraju@oracle.com, felipe@nutanix.com, thuth@redhat.com, ehabkost@redhat.com, konrad.wilk@oracle.com, dgilbert@redhat.com, liran.alon@oracle.com, stefanha@redhat.com, thanos.makatos@nutanix.com, rth@twiddle.net, kwolf@redhat.com, berrange@redhat.com, mreitz@redhat.com, ross.lagerwall@citrix.com, marcandre.lureau@gmail.com, pbonzini@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Proxy device object implements handler for PCI BAR writes and reads. The ha= ndler uses BAR_WRITE/BAR_READ message to communicate to the remote process with t= he BAR address and value to be written/read. The remote process implements handler for BAR_WRITE/BAR_READ message. Signed-off-by: Jagannathan Raman Signed-off-by: Elena Ufimtseva Signed-off-by: John G Johnson --- hw/proxy/qemu-proxy.c | 65 ++++++++++++++++++++++++++++++++++++++ include/hw/proxy/qemu-proxy.h | 22 +++++++++++-- include/io/mpqemu-link.h | 12 +++++++ remote/remote-main.c | 73 +++++++++++++++++++++++++++++++++++++++= ++++ 4 files changed, 170 insertions(+), 2 deletions(-) diff --git a/hw/proxy/qemu-proxy.c b/hw/proxy/qemu-proxy.c index d792e86..b17d9bb 100644 --- a/hw/proxy/qemu-proxy.c +++ b/hw/proxy/qemu-proxy.c @@ -262,3 +262,68 @@ static void pci_proxy_dev_realize(PCIDevice *device, E= rror **errp) dev->get_proxy_sock =3D get_proxy_sock; dev->init_proxy =3D init_proxy; } + +static void send_bar_access_msg(PCIProxyDev *dev, MemoryRegion *mr, + bool write, hwaddr addr, uint64_t *val, + unsigned size, bool memory) +{ + MPQemuLinkState *mpqemu_link =3D dev->mpqemu_link; + MPQemuMsg msg; + int wait; + + memset(&msg, 0, sizeof(MPQemuMsg)); + + msg.bytestream =3D 0; + msg.size =3D sizeof(msg.data1); + msg.data1.bar_access.addr =3D mr->addr + addr; + msg.data1.bar_access.size =3D size; + msg.data1.bar_access.memory =3D memory; + + if (write) { + msg.cmd =3D BAR_WRITE; + msg.data1.bar_access.val =3D *val; + } else { + wait =3D GET_REMOTE_WAIT; + + msg.cmd =3D BAR_READ; + msg.num_fds =3D 1; + msg.fds[0] =3D wait; + } + + mpqemu_msg_send(&msg, mpqemu_link->com); + + if (!write) { + *val =3D wait_for_remote(wait); + PUT_REMOTE_WAIT(wait); + } +} + +void proxy_default_bar_write(void *opaque, hwaddr addr, uint64_t val, + unsigned size) +{ + ProxyMemoryRegion *pmr =3D opaque; + + send_bar_access_msg(pmr->dev, &pmr->mr, true, addr, &val, size, + pmr->memory); +} + +uint64_t proxy_default_bar_read(void *opaque, hwaddr addr, unsigned size) +{ + ProxyMemoryRegion *pmr =3D opaque; + uint64_t val; + + send_bar_access_msg(pmr->dev, &pmr->mr, false, addr, &val, size, + pmr->memory); + + return val; +} + +const MemoryRegionOps proxy_default_ops =3D { + .read =3D proxy_default_bar_read, + .write =3D proxy_default_bar_write, + .endianness =3D DEVICE_NATIVE_ENDIAN, + .impl =3D { + .min_access_size =3D 1, + .max_access_size =3D 1, + }, +}; diff --git a/include/hw/proxy/qemu-proxy.h b/include/hw/proxy/qemu-proxy.h index 29fa2e9..44e370e 100644 --- a/include/hw/proxy/qemu-proxy.h +++ b/include/hw/proxy/qemu-proxy.h @@ -22,7 +22,19 @@ #define PCI_PROXY_DEV_GET_CLASS(obj) \ OBJECT_GET_CLASS(PCIProxyDevClass, (obj), TYPE_PCI_PROXY_DEV) =20 -typedef struct PCIProxyDev { +typedef struct PCIProxyDev PCIProxyDev; + +typedef struct ProxyMemoryRegion { + PCIProxyDev *dev; + MemoryRegion mr; + bool memory; + bool present; + uint8_t type; +} ProxyMemoryRegion; + +extern const MemoryRegionOps proxy_default_ops; + +struct PCIProxyDev { PCIDevice parent_dev; =20 MPQemuLinkState *mpqemu_link; @@ -41,7 +53,8 @@ typedef struct PCIProxyDev { void (*init_proxy) (PCIDevice *dev, char *command, char *exec_name, bool need_spawn, Error **errp); =20 -} PCIProxyDev; + ProxyMemoryRegion region[PCI_NUM_REGIONS]; +}; =20 typedef struct PCIProxyDevClass { PCIDeviceClass parent_class; @@ -51,4 +64,9 @@ typedef struct PCIProxyDevClass { char *command; } PCIProxyDevClass; =20 +void proxy_default_bar_write(void *opaque, hwaddr addr, uint64_t val, + unsigned size); + +uint64_t proxy_default_bar_read(void *opaque, hwaddr addr, unsigned size); + #endif /* QEMU_PROXY_H */ diff --git a/include/io/mpqemu-link.h b/include/io/mpqemu-link.h index 5a2be48..1a7738e 100644 --- a/include/io/mpqemu-link.h +++ b/include/io/mpqemu-link.h @@ -38,6 +38,8 @@ * PCI_CONFIG_READ PCI configuration space read * PCI_CONFIG_WRITE PCI configuration space write * SYNC_SYSMEM Shares QEMU's RAM with remote device's RAM + * BAR_WRITE Writes to PCI BAR region + * BAR_READ Reads from PCI BAR region * * proc_cmd_t enum type to specify the command to be executed on the remote * device. @@ -47,6 +49,8 @@ typedef enum { PCI_CONFIG_READ, PCI_CONFIG_WRITE, SYNC_SYSMEM, + BAR_WRITE, + BAR_READ, MAX, } mpqemu_cmd_t; =20 @@ -70,6 +74,13 @@ typedef struct { } sync_sysmem_msg_t; =20 typedef struct { + hwaddr addr; + uint64_t val; + unsigned size; + bool memory; +} bar_access_msg_t; + +typedef struct { mpqemu_cmd_t cmd; int bytestream; size_t size; @@ -77,6 +88,7 @@ typedef struct { union { uint64_t u64; sync_sysmem_msg_t sync_sysmem; + bar_access_msg_t bar_access; } data1; =20 int fds[REMOTE_MAX_FDS]; diff --git a/remote/remote-main.c b/remote/remote-main.c index 7b4cf2f..acd8daf 100644 --- a/remote/remote-main.c +++ b/remote/remote-main.c @@ -33,6 +33,7 @@ #include "sysemu/sysemu.h" #include "block/block.h" #include "exec/ramlist.h" +#include "exec/memattrs.h" =20 static MPQemuLinkState *mpqemu_link; PCIDevice *remote_pci_dev; @@ -63,6 +64,66 @@ static void process_config_read(MPQemuMsg *msg) PUT_REMOTE_WAIT(wait); } =20 +/* TODO: confirm memtx attrs. */ +static void process_bar_write(MPQemuMsg *msg, Error **errp) +{ + bar_access_msg_t *bar_access =3D &msg->data1.bar_access; + AddressSpace *as =3D + bar_access->memory ? &address_space_memory : &address_space_io; + MemTxResult res; + + res =3D address_space_rw(as, bar_access->addr, MEMTXATTRS_UNSPECIFIED, + (uint8_t *)&bar_access->val, bar_access->size, = true); + + if (res !=3D MEMTX_OK) { + error_setg(errp, "Could not perform address space write operation," + " inaccessible address: %lx.", bar_access->addr); + } +} + +static void process_bar_read(MPQemuMsg *msg, Error **errp) +{ + bar_access_msg_t *bar_access =3D &msg->data1.bar_access; + AddressSpace *as; + int wait =3D msg->fds[0]; + MemTxResult res; + uint64_t val =3D 0; + + as =3D bar_access->memory ? &address_space_memory : &address_space_io; + + assert(bar_access->size <=3D sizeof(uint64_t)); + + res =3D address_space_rw(as, bar_access->addr, MEMTXATTRS_UNSPECIFIED, + (uint8_t *)&val, bar_access->size, false); + + if (res !=3D MEMTX_OK) { + error_setg(errp, "Could not perform address space read operation," + " inaccessible address: %lx.", bar_access->addr); + val =3D (uint64_t)-1; + goto fail; + } + + switch (bar_access->size) { + case 4: + val =3D *((uint32_t *)&val); + break; + case 2: + val =3D *((uint16_t *)&val); + break; + case 1: + val =3D *((uint8_t *)&val); + break; + default: + error_setg(errp, "Invalid PCI BAR read size"); + return; + } + +fail: + notify_proxy(wait, val); + + PUT_REMOTE_WAIT(wait); +} + static void process_msg(GIOCondition cond, MPQemuChannel *chan) { MPQemuMsg *msg =3D NULL; @@ -88,6 +149,18 @@ static void process_msg(GIOCondition cond, MPQemuChanne= l *chan) case PCI_CONFIG_READ: process_config_read(msg); break; + case BAR_WRITE: + process_bar_write(msg, &err); + if (err) { + goto finalize_loop; + } + break; + case BAR_READ: + process_bar_read(msg, &err); + if (err) { + goto finalize_loop; + } + break; default: error_setg(&err, "Unknown command"); goto finalize_loop; --=20 1.8.3.1