From patchwork Wed Jun 14 22:56:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Alexander Graf X-Patchwork-Id: 13280530 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1282EEB64D9 for ; Wed, 14 Jun 2023 22:58:36 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1q9ZQ7-00089X-6i; Wed, 14 Jun 2023 18:56:55 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q9ZQ4-000875-G2; Wed, 14 Jun 2023 18:56:52 -0400 Received: from smtp-fw-80007.amazon.com ([99.78.197.218]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q9ZQ1-0000ie-Jb; Wed, 14 Jun 2023 18:56:51 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1686783410; x=1718319410; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=D5JuQYhhAZ0aCVTL7rtuhKR6Hvcto8zoysOTN8YUiac=; b=YoW1ot//dnb92ftK6v+7gALHsYD1WR6UNutKlRnyqyU/PyjuhLA0QqMx QRR5utOsguXpmoIZH2Vvh5dqmukSCxsE6lDmBytR8KlYcSfwbAiJmpVMN S+seaw29Gcu0Aue9doiFJS5l3JK761Uh9brQToneoPPyqa3LSdoS07aDS A=; X-IronPort-AV: E=Sophos;i="6.00,243,1681171200"; d="scan'208";a="220937793" Received: from pdx4-co-svc-p1-lb2-vlan3.amazon.com (HELO email-inbound-relay-iad-1d-m6i4x-d8e96288.us-east-1.amazon.com) ([10.25.36.214]) by smtp-border-fw-80007.pdx80.corp.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Jun 2023 22:56:43 +0000 Received: from EX19MTAUWA002.ant.amazon.com (iad12-ws-svc-p26-lb9-vlan3.iad.amazon.com [10.40.163.38]) by email-inbound-relay-iad-1d-m6i4x-d8e96288.us-east-1.amazon.com (Postfix) with ESMTPS id 609E7808CD; Wed, 14 Jun 2023 22:56:40 +0000 (UTC) Received: from EX19D020UWC004.ant.amazon.com (10.13.138.149) by EX19MTAUWA002.ant.amazon.com (10.250.64.202) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Wed, 14 Jun 2023 22:56:38 +0000 Received: from dev-dsk-graf-1a-5ce218e4.eu-west-1.amazon.com (10.253.83.51) by EX19D020UWC004.ant.amazon.com (10.13.138.149) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Wed, 14 Jun 2023 22:56:36 +0000 From: Alexander Graf To: CC: , , Cameron Esfahani , Roman Bolshakov , Stefan Hajnoczi , "Michael S. Tsirkin" , Kevin Wolf , Hanna Reitz , Marcel Apfelbaum , Paolo Bonzini , "Peter Maydell" Subject: [PATCH 09/12] hw/vmapple/bdif: Introduce vmapple backdoor interface Date: Wed, 14 Jun 2023 22:56:26 +0000 Message-ID: <20230614225626.97734-5-graf@amazon.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230614225626.97734-1-graf@amazon.com> References: <20230614224038.86148-1-graf> <20230614225626.97734-1-graf@amazon.com> MIME-Version: 1.0 X-Originating-IP: [10.253.83.51] X-ClientProxiedBy: EX19D040UWB004.ant.amazon.com (10.13.138.91) To EX19D020UWC004.ant.amazon.com (10.13.138.149) Precedence: Bulk Received-SPF: pass client-ip=99.78.197.218; envelope-from=prvs=52269c73c=graf@amazon.de; helo=smtp-fw-80007.amazon.com X-Spam_score_int: -40 X-Spam_score: -4.1 X-Spam_bar: ---- X-Spam_report: (-4.1 / 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, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org The VMApple machine exposes AUX and ROOT block devices (as well as USB OTG emulation) via virtio-pci as well as a special, simple backdoor platform device. This patch implements this backdoor platform device to the best of my understanding. I left out any USB OTG parts; they're only needed for guest recovery and I don't understand the protocol yet. Signed-off-by: Alexander Graf --- hw/vmapple/Kconfig | 2 + hw/vmapple/bdif.c | 245 ++++++++++++++++++++++++++++++++++++++ hw/vmapple/meson.build | 1 + hw/vmapple/trace-events | 5 + include/hw/vmapple/bdif.h | 31 +++++ 5 files changed, 284 insertions(+) create mode 100644 hw/vmapple/bdif.c create mode 100644 include/hw/vmapple/bdif.h diff --git a/hw/vmapple/Kconfig b/hw/vmapple/Kconfig index a73504d599..388a2bc60c 100644 --- a/hw/vmapple/Kconfig +++ b/hw/vmapple/Kconfig @@ -1,3 +1,5 @@ config VMAPPLE_AES bool +config VMAPPLE_BDIF + bool diff --git a/hw/vmapple/bdif.c b/hw/vmapple/bdif.c new file mode 100644 index 0000000000..36b5915ff3 --- /dev/null +++ b/hw/vmapple/bdif.c @@ -0,0 +1,245 @@ +/* + * VMApple Backdoor Interface + * + * Copyright © 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved. + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "hw/vmapple/bdif.h" +#include "qemu/log.h" +#include "qemu/module.h" +#include "qapi/error.h" +#include "trace.h" +#include "hw/block/block.h" +#include "sysemu/block-backend.h" + +#define REG_DEVID_MASK 0xffff0000 +#define DEVID_ROOT 0x00000000 +#define DEVID_AUX 0x00010000 +#define DEVID_USB 0x00100000 + +#define REG_STATUS 0x0 +#define REG_STATUS_ACTIVE BIT(0) +#define REG_CFG 0x4 +#define REG_CFG_ACTIVE BIT(1) +#define REG_UNK1 0x8 +#define REG_BUSY 0x10 +#define REG_BUSY_READY BIT(0) +#define REG_UNK2 0x400 +#define REG_CMD 0x408 +#define REG_NEXT_DEVICE 0x420 +#define REG_UNK3 0x434 + +typedef struct vblk_sector { + uint32_t pad; + uint32_t pad2; + uint32_t sector; + uint32_t pad3; +} VblkSector; + +typedef struct vblk_req_cmd { + uint64_t addr; + uint32_t len; + uint32_t flags; +} VblkReqCmd; + +typedef struct vblk_req { + VblkReqCmd sector; + VblkReqCmd data; + VblkReqCmd retval; +} VblkReq; + +#define VBLK_DATA_FLAGS_READ 0x00030001 +#define VBLK_DATA_FLAGS_WRITE 0x00010001 + +#define VBLK_RET_SUCCESS 0 +#define VBLK_RET_FAILED 1 + +static uint64_t bdif_read(void *opaque, hwaddr offset, unsigned size) +{ + uint64_t ret = -1; + uint64_t devid = (offset & REG_DEVID_MASK); + + switch (offset & ~REG_DEVID_MASK) { + case REG_STATUS: + ret = REG_STATUS_ACTIVE; + break; + case REG_CFG: + ret = REG_CFG_ACTIVE; + break; + case REG_UNK1: + ret = 0x420; + break; + case REG_BUSY: + ret = REG_BUSY_READY; + break; + case REG_UNK2: + ret = 0x1; + break; + case REG_UNK3: + ret = 0x0; + break; + case REG_NEXT_DEVICE: + switch (devid) { + case DEVID_ROOT: + ret = 0x8000000; + break; + case DEVID_AUX: + ret = 0x10000; + break; + } + break; + } + + trace_bdif_read(offset, size, ret); + return ret; +} + +static void le2cpu_sector(VblkSector *sector) +{ + sector->sector = le32_to_cpu(sector->sector); +} + +static void le2cpu_reqcmd(VblkReqCmd *cmd) +{ + cmd->addr = le64_to_cpu(cmd->addr); + cmd->len = le32_to_cpu(cmd->len); + cmd->flags = le32_to_cpu(cmd->flags); +} + +static void le2cpu_req(VblkReq *req) +{ + le2cpu_reqcmd(&req->sector); + le2cpu_reqcmd(&req->data); + le2cpu_reqcmd(&req->retval); +} + +static void vblk_cmd(uint64_t devid, BlockBackend *blk, uint64_t value, + uint64_t static_off) +{ + VblkReq req; + VblkSector sector; + uint64_t off = 0; + char *buf = NULL; + uint8_t ret = VBLK_RET_FAILED; + int r; + + cpu_physical_memory_read(value, &req, sizeof(req)); + le2cpu_req(&req); + + if (req.sector.len != sizeof(sector)) { + ret = VBLK_RET_FAILED; + goto out; + } + + /* Read the vblk command */ + cpu_physical_memory_read(req.sector.addr, §or, sizeof(sector)); + le2cpu_sector(§or); + + off = sector.sector * 512ULL + static_off; + + /* Sanity check that we're not allocating bogus sizes */ + if (req.data.len > (128 * 1024 * 1024)) { + goto out; + } + + buf = g_malloc0(req.data.len); + switch (req.data.flags) { + case VBLK_DATA_FLAGS_READ: + r = blk_pread(blk, off, req.data.len, buf, 0); + trace_bdif_vblk_read(devid == DEVID_AUX ? "aux" : "root", + req.data.addr, off, req.data.len, r); + if (r < 0) { + goto out; + } + cpu_physical_memory_write(req.data.addr, buf, req.data.len); + ret = VBLK_RET_SUCCESS; + break; + case VBLK_DATA_FLAGS_WRITE: + /* Not needed, iBoot only reads */ + break; + default: + break; + } + +out: + g_free(buf); + cpu_physical_memory_write(req.retval.addr, &ret, 1); +} + +static void bdif_write(void *opaque, hwaddr offset, + uint64_t value, unsigned size) +{ + VMAppleBdifState *s = opaque; + uint64_t devid = (offset & REG_DEVID_MASK); + + trace_bdif_write(offset, size, value); + + switch (offset & ~REG_DEVID_MASK) { + case REG_CMD: + switch (devid) { + case DEVID_ROOT: + vblk_cmd(devid, s->root, value, 0x0); + break; + case DEVID_AUX: + vblk_cmd(devid, s->aux, value, 0x0); + break; + } + break; + } +} + +static const MemoryRegionOps bdif_ops = { + .read = bdif_read, + .write = bdif_write, + .endianness = DEVICE_NATIVE_ENDIAN, + .valid = { + .min_access_size = 1, + .max_access_size = 8, + }, + .impl = { + .min_access_size = 1, + .max_access_size = 8, + }, +}; + +static void bdif_init(Object *obj) +{ + VMAppleBdifState *s = VMAPPLE_BDIF(obj); + + memory_region_init_io(&s->mmio, obj, &bdif_ops, obj, + "VMApple Backdoor Interface", VMAPPLE_BDIF_SIZE); + sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio); +} + +static Property bdif_properties[] = { + DEFINE_PROP_DRIVE("aux", VMAppleBdifState, aux), + DEFINE_PROP_DRIVE("root", VMAppleBdifState, root), + DEFINE_PROP_END_OF_LIST(), +}; + +static void bdif_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + + dc->desc = "VMApple Backdoor Interface"; + device_class_set_props(dc, bdif_properties); +} + +static const TypeInfo bdif_info = { + .name = TYPE_VMAPPLE_BDIF, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(VMAppleBdifState), + .instance_init = bdif_init, + .class_init = bdif_class_init, +}; + +static void bdif_register_types(void) +{ + type_register_static(&bdif_info); +} + +type_init(bdif_register_types) diff --git a/hw/vmapple/meson.build b/hw/vmapple/meson.build index 9b9ba548a9..f26ae602eb 100644 --- a/hw/vmapple/meson.build +++ b/hw/vmapple/meson.build @@ -1 +1,2 @@ softmmu_ss.add(when: 'CONFIG_VMAPPLE_AES', if_true: files('aes.c')) +softmmu_ss.add(when: 'CONFIG_VMAPPLE_BDIF', if_true: files('bdif.c')) diff --git a/hw/vmapple/trace-events b/hw/vmapple/trace-events index 03585cdf0f..45c69de2e0 100644 --- a/hw/vmapple/trace-events +++ b/hw/vmapple/trace-events @@ -18,3 +18,8 @@ aes_2_read(uint64_t offset, uint64_t res) "offset=0x%"PRIx64" res=0x%"PRIx64 aes_2_write_unknown(uint64_t offset) "offset=0x%"PRIx64 aes_2_write(uint64_t offset, uint64_t val) "offset=0x%"PRIx64" val=0x%"PRIx64 aes_dump_data(const char *desc, const char *hex) "%s%s" + +# bdif.c +bdif_read(uint64_t offset, uint32_t size, uint64_t value) "offset=0x%"PRIx64" size=0x%x value=0x%"PRIx64 +bdif_write(uint64_t offset, uint32_t size, uint64_t value) "offset=0x%"PRIx64" size=0x%x value=0x%"PRIx64 +bdif_vblk_read(const char *dev, uint64_t addr, uint64_t offset, uint32_t len, int r) "dev=%s addr=0x%"PRIx64" off=0x%"PRIx64" size=0x%x r=%d" diff --git a/include/hw/vmapple/bdif.h b/include/hw/vmapple/bdif.h new file mode 100644 index 0000000000..65ee43457b --- /dev/null +++ b/include/hw/vmapple/bdif.h @@ -0,0 +1,31 @@ +/* + * VMApple Backdoor Interface + * + * Copyright © 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved. + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#ifndef HW_VMAPPLE_BDIF_H +#define HW_VMAPPLE_BDIF_H + +#include "hw/sysbus.h" +#include "qom/object.h" + +#define TYPE_VMAPPLE_BDIF "vmapple-bdif" +OBJECT_DECLARE_SIMPLE_TYPE(VMAppleBdifState, VMAPPLE_BDIF) + +struct VMAppleBdifState { + /* */ + SysBusDevice parent_obj; + + /* */ + BlockBackend *aux; + BlockBackend *root; + MemoryRegion mmio; +}; + +#define VMAPPLE_BDIF_SIZE 0x00200000 + +#endif /* HW_VMAPPLE_BDIF_H */