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Mon, 06 Apr 2020 09:42:07 +0000 Received: from abhmp0016.oracle.com (abhmp0016.oracle.com [141.146.116.22]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 0369g6Em031919; Mon, 6 Apr 2020 09:42:06 GMT Received: from flaka.hsd1.ca.comcast.net (/67.180.143.163) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 06 Apr 2020 02:42:06 -0700 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 : mime-version : content-transfer-encoding; s=corp-2020-01-29; bh=4mO2dJF75SlZTMUcGzJgBWOZymNp9EgvlBVCh8v7ZU8=; b=m4oMxuUxSrbuaiVpyRW4oI7eWq3K3JPPnje5Mw/p8lM/oD3qzORqK9d1akk5WaK7t5dM 4aBkYKN6gzMSAGZidXDv/KtudfdlRApW3hx1aSMnrNAJNQ2u/7h5lj9Lylukk8fcB2W0 CVNMRjympEplXFT+ZsyTDNXh6BAvxToqXWbhBKUeYxIR/crdjeOG7NKl+2lJ2R9J1R8b W8bgkqSAeXENdtLdYeTP/yZNMVuhXi081zDX7mYQae1WAN4UNwVFrfK/CJ/KcJM1bgun tCdmiw6mQbktkbJpuDZVrZRHEl9ITuY/+BUiUK0GxMhN/eTNSJbbMYCqBkRh4DWZ4L7r iQ== From: elena.ufimtseva@oracle.com To: qemu-devel@nongnu.org Subject: [PATCH v6 21/36] multi-process: PCI BAR read/write handling for proxy & remote endpoints Date: Mon, 6 Apr 2020 02:41:11 -0700 Message-Id: <848b7213d9c1de43f5f5c8518a4f5bcd46faec7e.1586165556.git.elena.ufimtseva@oracle.com> X-Mailer: git-send-email 2.25.GIT In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9582 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 phishscore=0 malwarescore=0 bulkscore=0 spamscore=0 adultscore=0 mlxlogscore=999 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004060084 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9582 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 mlxlogscore=999 spamscore=0 priorityscore=1501 suspectscore=1 lowpriorityscore=0 malwarescore=0 impostorscore=0 mlxscore=0 phishscore=0 adultscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004060083 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 141.146.126.78 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-Type: text/plain; charset="utf-8" From: Jagannathan Raman Proxy device object implements handler for PCI BAR writes and reads. The handler uses BAR_WRITE/BAR_READ message to communicate to the remote process with the 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 | 64 ++++++++++++++++++++++++++++++ include/hw/proxy/qemu-proxy.h | 20 +++++++++- include/io/mpqemu-link.h | 12 ++++++ io/mpqemu-link.c | 6 +++ remote/remote-main.c | 73 +++++++++++++++++++++++++++++++++++ 5 files changed, 173 insertions(+), 2 deletions(-) diff --git a/hw/proxy/qemu-proxy.c b/hw/proxy/qemu-proxy.c index 87cf39c672..7fd0a312a5 100644 --- a/hw/proxy/qemu-proxy.c +++ b/hw/proxy/qemu-proxy.c @@ -169,3 +169,67 @@ static void pci_proxy_dev_register_types(void) =20 type_init(pci_proxy_dev_register_types) =20 +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->dev); + + 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 d7eaf26f29..9e4127eccb 100644 --- a/include/hw/proxy/qemu-proxy.h +++ b/include/hw/proxy/qemu-proxy.h @@ -26,14 +26,25 @@ #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; + +struct PCIProxyDev { PCIDevice parent_dev; =20 MPQemuLinkState *mpqemu_link; =20 int socket; =20 -} PCIProxyDev; + ProxyMemoryRegion region[PCI_NUM_REGIONS]; +}; =20 typedef struct PCIProxyDevClass { PCIDeviceClass parent_class; @@ -43,4 +54,9 @@ 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 7228a1915e..41cf092f9e 100644 --- a/include/io/mpqemu-link.h +++ b/include/io/mpqemu-link.h @@ -31,6 +31,8 @@ /** * mpqemu_cmd_t: * 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. @@ -41,6 +43,8 @@ typedef enum { CONNECT_DEV, PCI_CONFIG_WRITE, PCI_CONFIG_READ, + BAR_WRITE, + BAR_READ, MAX, } mpqemu_cmd_t; =20 @@ -56,6 +60,13 @@ typedef struct { ram_addr_t offsets[REMOTE_MAX_FDS]; } sync_sysmem_msg_t; =20 +typedef struct { + hwaddr addr; + uint64_t val; + unsigned size; + bool memory; +} bar_access_msg_t; + /** * MPQemuMsg: * @cmd: The remote command @@ -78,6 +89,7 @@ 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/io/mpqemu-link.c b/io/mpqemu-link.c index 643c0588ce..2b67ef6410 100644 --- a/io/mpqemu-link.c +++ b/io/mpqemu-link.c @@ -367,6 +367,12 @@ bool mpqemu_msg_valid(MPQemuMsg *msg) return false; } break; + case BAR_WRITE: + case BAR_READ: + if (msg->size !=3D sizeof(msg->data1)) { + return false; + } + break; default: break; } diff --git a/remote/remote-main.c b/remote/remote-main.c index b5ed31f63b..4f512aa5a8 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 void process_msg(GIOCondition cond, MPQemuLinkState *link, MPQemuChannel *chan); @@ -102,6 +103,66 @@ exit: notify_proxy(wait, ret); } =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, MPQemuLinkState *link, MPQemuChannel *chan) { @@ -131,6 +192,18 @@ static void process_msg(GIOCondition cond, MPQemuLinkS= tate *link, case PCI_CONFIG_READ: process_config_read(LINK_TO_DEV(link), 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 2.25.GIT