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bh=h+P32GwMmJrAsnn4mPBX5ou9ZFbGVPORpaIR+wSCHIM=; b=VJY+LpXQwfJWwmZLaViOlDi2Y75KcV5a3fIeBN02bwv8KEnbTtymyGwa9s8/UdEIHI+g4+ Uc4tP4B/9jBBCZEACWiUiiFOlg4gSyWmAkplxv3n0Q/AOI+qw9nKVM6xoUQb0E1jmjDVwJ 5sHm5BGJXk7Rgu2et3rjH1EERHuR1Zg= X-MC-Unique: egPiZ0DzPDiNp8zc27ZRyA-1 From: Stefan Hajnoczi To: Peter Maydell , qemu-devel@nongnu.org Subject: [PULL 21/27] multi-process: Forward PCI config space acceses to the remote process Date: Thu, 4 Feb 2021 09:58:28 +0000 Message-Id: <20210204095834.345749-22-stefanha@redhat.com> In-Reply-To: <20210204095834.345749-1-stefanha@redhat.com> References: <20210204095834.345749-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=63.128.21.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.539, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MIME_BASE64_TEXT=1.741, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Elena Ufimtseva , Fam Zheng , Thomas Huth , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Eduardo Habkost , qemu-block@nongnu.org, John G Johnson , "Denis V. Lunev" , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , "Michael S. Tsirkin" , Wainer dos Santos Moschetta , Stefan Hajnoczi , Paolo Bonzini , Igor Mammedov , Jagannathan Raman , =?UTF-8?q?Alex=20Benn=C3=A9e?= 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: Elena Ufimtseva The Proxy Object sends the PCI config space accesses as messages to the remote process over the communication channel Signed-off-by: Elena Ufimtseva Signed-off-by: Jagannathan Raman Signed-off-by: John G Johnson Reviewed-by: Stefan Hajnoczi Message-id: d3c94f4618813234655356c60e6f0d0362ff42d6.1611938319.git.jag.ram= an@oracle.com Signed-off-by: Stefan Hajnoczi --- include/hw/remote/mpqemu-link.h | 10 ++++++ hw/remote/message.c | 60 +++++++++++++++++++++++++++++++++ hw/remote/mpqemu-link.c | 8 ++++- hw/remote/proxy.c | 55 ++++++++++++++++++++++++++++++ 4 files changed, 132 insertions(+), 1 deletion(-) diff --git a/include/hw/remote/mpqemu-link.h b/include/hw/remote/mpqemu-lin= k.h index 1b35d408f8..7bc0bddb5a 100644 --- a/include/hw/remote/mpqemu-link.h +++ b/include/hw/remote/mpqemu-link.h @@ -34,6 +34,9 @@ */ typedef enum { MPQEMU_CMD_SYNC_SYSMEM, + MPQEMU_CMD_RET, + MPQEMU_CMD_PCI_CFGWRITE, + MPQEMU_CMD_PCI_CFGREAD, MPQEMU_CMD_MAX, } MPQemuCmd; =20 @@ -43,6 +46,12 @@ typedef struct { off_t offsets[REMOTE_MAX_FDS]; } SyncSysmemMsg; =20 +typedef struct { + uint32_t addr; + uint32_t val; + int len; +} PciConfDataMsg; + /** * MPQemuMsg: * @cmd: The remote command @@ -60,6 +69,7 @@ typedef struct { =20 union { uint64_t u64; + PciConfDataMsg pci_conf_data; SyncSysmemMsg sync_sysmem; } data; =20 diff --git a/hw/remote/message.c b/hw/remote/message.c index 36e2d4fb0c..636bd161bd 100644 --- a/hw/remote/message.c +++ b/hw/remote/message.c @@ -15,6 +15,12 @@ #include "hw/remote/mpqemu-link.h" #include "qapi/error.h" #include "sysemu/runstate.h" +#include "hw/pci/pci.h" + +static void process_config_write(QIOChannel *ioc, PCIDevice *dev, + MPQemuMsg *msg, Error **errp); +static void process_config_read(QIOChannel *ioc, PCIDevice *dev, + MPQemuMsg *msg, Error **errp); =20 void coroutine_fn mpqemu_remote_msg_loop_co(void *data) { @@ -40,6 +46,12 @@ void coroutine_fn mpqemu_remote_msg_loop_co(void *data) } =20 switch (msg.cmd) { + case MPQEMU_CMD_PCI_CFGWRITE: + process_config_write(com->ioc, pci_dev, &msg, &local_err); + break; + case MPQEMU_CMD_PCI_CFGREAD: + process_config_read(com->ioc, pci_dev, &msg, &local_err); + break; default: error_setg(&local_err, "Unknown command (%d) received for device %s" @@ -55,3 +67,51 @@ void coroutine_fn mpqemu_remote_msg_loop_co(void *data) qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); } } + +static void process_config_write(QIOChannel *ioc, PCIDevice *dev, + MPQemuMsg *msg, Error **errp) +{ + ERRP_GUARD(); + PciConfDataMsg *conf =3D (PciConfDataMsg *)&msg->data.pci_conf_data; + MPQemuMsg ret =3D { 0 }; + + if ((conf->addr + sizeof(conf->val)) > pci_config_size(dev)) { + error_setg(errp, "Bad address for PCI config write, pid "FMT_pid".= ", + getpid()); + ret.data.u64 =3D UINT64_MAX; + } else { + pci_default_write_config(dev, conf->addr, conf->val, conf->len); + } + + ret.cmd =3D MPQEMU_CMD_RET; + ret.size =3D sizeof(ret.data.u64); + + if (!mpqemu_msg_send(&ret, ioc, NULL)) { + error_prepend(errp, "Error returning code to proxy, pid "FMT_pid":= ", + getpid()); + } +} + +static void process_config_read(QIOChannel *ioc, PCIDevice *dev, + MPQemuMsg *msg, Error **errp) +{ + ERRP_GUARD(); + PciConfDataMsg *conf =3D (PciConfDataMsg *)&msg->data.pci_conf_data; + MPQemuMsg ret =3D { 0 }; + + if ((conf->addr + sizeof(conf->val)) > pci_config_size(dev)) { + error_setg(errp, "Bad address for PCI config read, pid "FMT_pid".", + getpid()); + ret.data.u64 =3D UINT64_MAX; + } else { + ret.data.u64 =3D pci_default_read_config(dev, conf->addr, conf->le= n); + } + + ret.cmd =3D MPQEMU_CMD_RET; + ret.size =3D sizeof(ret.data.u64); + + if (!mpqemu_msg_send(&ret, ioc, NULL)) { + error_prepend(errp, "Error returning code to proxy, pid "FMT_pid":= ", + getpid()); + } +} diff --git a/hw/remote/mpqemu-link.c b/hw/remote/mpqemu-link.c index 88d1f9bd5c..5bd6a9dcbf 100644 --- a/hw/remote/mpqemu-link.c +++ b/hw/remote/mpqemu-link.c @@ -207,7 +207,7 @@ uint64_t mpqemu_msg_send_and_await_reply(MPQemuMsg *msg= , PCIProxyDev *pdev, return ret; } =20 - if (!mpqemu_msg_valid(&msg_reply)) { + if (!mpqemu_msg_valid(&msg_reply) || msg_reply.cmd !=3D MPQEMU_CMD_RET= ) { error_setg(errp, "ERROR: Invalid reply received for command %d", msg->cmd); return ret; @@ -242,6 +242,12 @@ bool mpqemu_msg_valid(MPQemuMsg *msg) return false; } break; + case MPQEMU_CMD_PCI_CFGWRITE: + case MPQEMU_CMD_PCI_CFGREAD: + if (msg->size !=3D sizeof(PciConfDataMsg)) { + return false; + } + break; default: break; } diff --git a/hw/remote/proxy.c b/hw/remote/proxy.c index cd5b071ab4..2b1439432b 100644 --- a/hw/remote/proxy.c +++ b/hw/remote/proxy.c @@ -17,6 +17,8 @@ #include "monitor/monitor.h" #include "migration/blocker.h" #include "qemu/sockets.h" +#include "hw/remote/mpqemu-link.h" +#include "qemu/error-report.h" =20 static void pci_proxy_dev_realize(PCIDevice *device, Error **errp) { @@ -65,6 +67,56 @@ static void pci_proxy_dev_exit(PCIDevice *pdev) error_free(dev->migration_blocker); } =20 +static void config_op_send(PCIProxyDev *pdev, uint32_t addr, uint32_t *val, + int len, unsigned int op) +{ + MPQemuMsg msg =3D { 0 }; + uint64_t ret =3D -EINVAL; + Error *local_err =3D NULL; + + msg.cmd =3D op; + msg.data.pci_conf_data.addr =3D addr; + msg.data.pci_conf_data.val =3D (op =3D=3D MPQEMU_CMD_PCI_CFGWRITE) ? *= val : 0; + msg.data.pci_conf_data.len =3D len; + msg.size =3D sizeof(PciConfDataMsg); + + ret =3D mpqemu_msg_send_and_await_reply(&msg, pdev, &local_err); + if (local_err) { + error_report_err(local_err); + } + + if (ret =3D=3D UINT64_MAX) { + error_report("Failed to perform PCI config %s operation", + (op =3D=3D MPQEMU_CMD_PCI_CFGREAD) ? "READ" : "WRITE"= ); + } + + if (op =3D=3D MPQEMU_CMD_PCI_CFGREAD) { + *val =3D (uint32_t)ret; + } +} + +static uint32_t pci_proxy_read_config(PCIDevice *d, uint32_t addr, int len) +{ + uint32_t val; + + config_op_send(PCI_PROXY_DEV(d), addr, &val, len, MPQEMU_CMD_PCI_CFGRE= AD); + + return val; +} + +static void pci_proxy_write_config(PCIDevice *d, uint32_t addr, uint32_t v= al, + int len) +{ + /* + * Some of the functions access the copy of remote device's PCI config + * space which is cached in the proxy device. Therefore, maintain + * it updated. + */ + pci_default_write_config(d, addr, val, len); + + config_op_send(PCI_PROXY_DEV(d), addr, &val, len, MPQEMU_CMD_PCI_CFGWR= ITE); +} + static Property proxy_properties[] =3D { DEFINE_PROP_STRING("fd", PCIProxyDev, fd), DEFINE_PROP_END_OF_LIST(), @@ -77,6 +129,9 @@ static void pci_proxy_dev_class_init(ObjectClass *klass,= void *data) =20 k->realize =3D pci_proxy_dev_realize; k->exit =3D pci_proxy_dev_exit; + k->config_read =3D pci_proxy_read_config; + k->config_write =3D pci_proxy_write_config; + device_class_set_props(dc, proxy_properties); } =20 --=20 2.29.2