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Date: Tue, 25 Jan 2011 08:10:11 -0600
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] [PATCH 1/7] usb-ccid: add CCID bus
References: <1294735094-3636-1-git-send-email-alevy@redhat.com>
	<1294735094-3636-2-git-send-email-alevy@redhat.com>
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To: Alon Levy <alevy@redhat.com>
Cc: qemu-devel@nongnu.org

On 01/11/2011 02:38 AM, Alon Levy wrote:
> A CCID device is a smart card reader. It is a USB device, defined at [1].
> This patch introduces the usb-ccid device that is a ccid bus. Next patches will
> introduce two card types to use it, a passthru card and an emulated card.
>
>   [1] http://www.usb.org/developers/devclass_docs/DWG_Smart-Card_CCID_Rev110.
>
> Signed-off-by: Alon Levy<alevy@redhat.com>
> ---
>   Makefile.objs |    1 +
>   configure     |    6 +
>   hw/ccid.h     |   35 ++
>   hw/usb-ccid.c | 1355 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>   4 files changed, 1397 insertions(+), 0 deletions(-)
>   create mode 100644 hw/ccid.h
>   create mode 100644 hw/usb-ccid.c
>
> diff --git a/Makefile.objs b/Makefile.objs
> index d6b3d60..7da4771 100644
> --- a/Makefile.objs
> +++ b/Makefile.objs
> @@ -197,6 +197,7 @@ hw-obj-$(CONFIG_FDC) += fdc.o
>   hw-obj-$(CONFIG_ACPI) += acpi.o acpi_piix4.o
>   hw-obj-$(CONFIG_APM) += pm_smbus.o apm.o
>   hw-obj-$(CONFIG_DMA) += dma.o
> +hw-obj-$(CONFIG_SMARTCARD) += usb-ccid.o
>
>   # PPC devices
>   hw-obj-$(CONFIG_OPENPIC) += openpic.o
> diff --git a/configure b/configure
> index 831a741..839980c 100755
> --- a/configure
> +++ b/configure
> @@ -334,6 +334,7 @@ trace_backend="nop"
>   trace_file="trace"
>   spice=""
>   rbd=""
> +smartcard="yes"
>
>   # OS specific
>   if check_define __linux__ ; then
> @@ -2441,6 +2442,7 @@ echo "Trace output file $trace_file-<pid>"
>   echo "spice support     $spice"
>   echo "rbd support       $rbd"
>   echo "xfsctl support    $xfs"
> +echo "smartcard support $smartcard"
>    

Device don't get printed out in configure because they aren't probed.
> diff --git a/hw/ccid.h b/hw/ccid.h
> new file mode 100644
> index 0000000..af59070
> --- /dev/null
> +++ b/hw/ccid.h
> @@ -0,0 +1,35 @@
> +#ifndef __CCID_H__
> +#define __CCID_H__
>    

No copyright and this is not valid C (you're not support to use __ prefix).

> +#include "qdev.h"
> +
> +typedef struct CCIDCardState CCIDCardState;
> +typedef struct CCIDCardInfo CCIDCardInfo;
> +
> +struct CCIDCardState {
> +    DeviceState qdev;
> +    uint32_t    slot; // For future use with multiple slot reader.
>    

Don't use C99 comments.

> +};
> +
> +struct CCIDCardInfo {
> +    DeviceInfo qdev;
> +    void (*print)(Monitor *mon, CCIDCardState *card, int indent);
> +    const uint8_t *(*get_atr)(CCIDCardState *card, uint32_t *len);
> +    void (*apdu_from_guest)(CCIDCardState *card, const uint8_t *apdu, uint32_t len);
> +    int (*exitfn)(CCIDCardState *card);
> +    int (*initfn)(CCIDCardState *card);
> +};
> +
> +void ccid_card_send_apdu_to_guest(CCIDCardState *card, uint8_t* apdu, uint32_t len);
> +void ccid_card_card_removed(CCIDCardState *card);
> +void ccid_card_card_inserted(CCIDCardState *card);
> +void ccid_card_card_error(CCIDCardState *card, uint64_t error);
> +void ccid_card_qdev_register(CCIDCardInfo *card);
> +
> +/* support guest visible insertion/removal of ccid devices based on actual
> + * devices connected/removed. Called by card implementation (passthru, local) */
> +int ccid_card_ccid_attach(CCIDCardState *card);
> +void ccid_card_ccid_detach(CCIDCardState *card);
> +
> +#endif // __CCID_H__
> +
> diff --git a/hw/usb-ccid.c b/hw/usb-ccid.c
> new file mode 100644
> index 0000000..58f69a6
> --- /dev/null
> +++ b/hw/usb-ccid.c
> @@ -0,0 +1,1355 @@
> +/*
> + * CCID Device emulation
> + *
> + * Based on usb-serial.c:
> + * Copyright (c) 2006 CodeSourcery.
> + * Copyright (c) 2008 Samuel Thibault<samuel.thibault@ens-lyon.org>
> + * Written by Paul Brook, reused for FTDI by Samuel Thibault,
> + * Reused for CCID by Alon Levy.
> + * Contributed to by Robert Relyea
> + * Copyright (c) 2010 Red Hat.
> + *
> + * This code is licenced under the LGPL.
> + */
> +
> +/* References:
> + *
> + * CCID Specification Revision 1.1 April 22nd 2005
> + *  "Universal Serial Bus, Device Class: Smart Card"
> + *  Specification for Integrated Circuit(s) Cards Interface Devices
> + *
> + * Endianess note: from the spec (1.3)
> + *  "Fields that are larger than a byte are stored in little endian
> + *
> + * KNOWN BUGS
> + * 1. remove/insert can sometimes result in removed state instead of inserted.
> + * This is a result of the following:
> + *  symptom: dmesg shows ERMOTEIO (-121), pcscd shows -99. This happens
> + *  when we send a too short packet, seen in uhci-usb.c, resulting from
> + *  a urb requesting SPD and us returning a smaller packet.
> + *  Not sure which messages trigger this.
> + *
> + * Migration note:
> + *
> + * All the VMStateDescription's are left here for future use, but
> + * not enabled right now since there is no support for USB migration.
> + *
> + * To enable define ENABLE_MIGRATION
> + */
> +
> +#include "qemu-common.h"
> +#include "qemu-error.h"
> +#include "usb.h"
> +#include "monitor.h"
> +
> +#include "hw/ccid.h"
> +
> +//#define DEBUG_CCID
> +
> +#define DPRINTF(s, lvl, fmt, ...) \
> +do { if (lvl<= s->debug) { printf("usb-ccid: " fmt , ## __VA_ARGS__); } } while (0)
> +
> +#define CCID_DEV_NAME "usb-ccid"
> +
> +/* The two options for variable sized buffers:
> + * make them constant size, for large enough constant,
> + * or handle the migration complexity - VMState doesn't handle this case.
> + * sizes are expected never to be exceeded, unless guest misbehaves. */
> +#define BULK_OUT_DATA_SIZE 65536
> +#define PENDING_ANSWERS_NUM 128
> +
> +#define BULK_IN_BUF_SIZE 384
> +#define BULK_IN_PENDING_NUM 8
> +
> +#define InterfaceOutClass    ((USB_DIR_OUT|USB_TYPE_CLASS|USB_RECIP_INTERFACE)<<8)
> +#define InterfaceInClass     ((USB_DIR_IN |USB_TYPE_CLASS|USB_RECIP_INTERFACE)<<8)
> +
> +#define CCID_CONTROL_ABORT                  0x1
> +#define CCID_CONTROL_GET_CLOCK_FREQUENCIES  0x2
> +#define CCID_CONTROL_GET_DATA_RATES         0x3
> +
> +#define CCID_PRODUCT_DESCRIPTION        "QEMU USB CCID"
> +#define CCID_VENDOR_DESCRIPTION         "QEMU " QEMU_VERSION
>    

Note the exposing the version creates a backwards compatibility issue.

> +#define CCID_INTERFACE_NAME             "CCID Interface"
> +#define CCID_SERIAL_NUMBER_STRING       "1"
> +/* Using Gemplus Vendor and Product id
> +  Effect on various drivers:
> +  * usbccid.sys (winxp, others untested) is a class driver so it doesn't care.
> +  * linux has a number of class drivers, but openct filters based on
> +    vendor/product (/etc/openct.conf under fedora), hence Gemplus.
> + */
> +#define CCID_VENDOR_ID                  0x08e6
> +#define CCID_PRODUCT_ID                 0x4433
> +#define CCID_DEVICE_VERSION             0x0000
> +
> +/* BULK_OUT messages from PC to Reader
> +   Defined in CCID Rev 1.1 6.1 (page 26)
> + */
> +#define CCID_MESSAGE_TYPE_PC_to_RDR_IccPowerOn              0x62
> +#define CCID_MESSAGE_TYPE_PC_to_RDR_IccPowerOff             0x63
> +#define CCID_MESSAGE_TYPE_PC_to_RDR_GetSlotStatus           0x65
> +#define CCID_MESSAGE_TYPE_PC_to_RDR_XfrBlock                0x6f
> +#define CCID_MESSAGE_TYPE_PC_to_RDR_GetParameters           0x6c
> +#define CCID_MESSAGE_TYPE_PC_to_RDR_ResetParameters         0x6d
> +#define CCID_MESSAGE_TYPE_PC_to_RDR_SetParameters           0x61
> +#define CCID_MESSAGE_TYPE_PC_to_RDR_Escape                  0x6b
> +#define CCID_MESSAGE_TYPE_PC_to_RDR_IccClock                0x6e
> +#define CCID_MESSAGE_TYPE_PC_to_RDR_T0APDU                  0x6a
> +#define CCID_MESSAGE_TYPE_PC_to_RDR_Secure                  0x69
> +#define CCID_MESSAGE_TYPE_PC_to_RDR_Mechanical              0x71
> +#define CCID_MESSAGE_TYPE_PC_to_RDR_Abort                   0x72
> +#define CCID_MESSAGE_TYPE_PC_to_RDR_SetDataRateAndClockFrequency 0x73
> +
> +/* BULK_IN messages from Reader to PC
> +   Defined in CCID Rev 1.1 6.2 (page 48)
> + */
> +#define CCID_MESSAGE_TYPE_RDR_to_PC_DataBlock               0x80
> +#define CCID_MESSAGE_TYPE_RDR_to_PC_SlotStatus              0x81
> +#define CCID_MESSAGE_TYPE_RDR_to_PC_Parameters              0x82
> +#define CCID_MESSAGE_TYPE_RDR_to_PC_Escape                  0x83
> +#define CCID_MESSAGE_TYPE_RDR_to_PC_DataRateAndClockFrequency 0x84
> +
> +/* INTERRUPT_IN messages from Reader to PC
> +   Defined in CCID Rev 1.1 6.3 (page 56)
> + */
> +#define CCID_MESSAGE_TYPE_RDR_to_PC_NotifySlotChange        0x50
> +#define CCID_MESSAGE_TYPE_RDR_to_PC_HardwareError           0x51
> +
> +/* Endpoints for CCID - addresses are up to us to decide.
> +   To support slot insertion and removal we must have an interrupt in ep
> +   in addition we need a bulk in and bulk out ep
> +   5.2, page 20
> + */
> +#define CCID_INT_IN_EP       1
> +#define CCID_BULK_IN_EP      2
> +#define CCID_BULK_OUT_EP     3
> +
> +/* bmSlotICCState masks */
> +#define SLOT_0_STATE_MASK    1
> +#define SLOT_0_CHANGED_MASK  2
> +
> +/* Status codes that go in bStatus (see 6.2.6) */
> +enum {
> +    ICC_STATUS_PRESENT_ACTIVE = 0,
> +    ICC_STATUS_PRESENT_INACTIVE,
> +    ICC_STATUS_NOT_PRESENT
> +};
> +
> +enum {
> +    COMMAND_STATUS_NO_ERROR = 0,
> +    COMMAND_STATUS_FAILED,
> +    COMMAND_STATUS_TIME_EXTENSION_REQUIRED
> +};
> +
> +/* Error codes that go in bError (see 6.2.6)
> + */
> +enum {
> +    ERROR_CMD_NOT_SUPPORTED = 0,
> +    ERROR_CMD_ABORTED       = -1,
> +    ERROR_ICC_MUTE          = -2,
> +    ERROR_XFR_PARITY_ERROR  = -3,
> +    ERROR_XFR_OVERRUN       = -4,
> +    ERROR_HW_ERROR          = -5,
> +};
> +
> +/* 6.2.6 RDR_to_PC_SlotStatus definitions */
> +enum {
> +    CLOCK_STATUS_RUNNING = 0,
> +    /* 0 - Clock Running, 1 - Clock stopped in State L, 2 - H,
> +       3 - unkonwn state. rest are RFU
> +     */
> +};
> +
> +typedef struct __attribute__ ((__packed__)) CCID_Header {
> +    uint8_t     bMessageType;
> +    uint32_t    dwLength;
> +    uint8_t     bSlot;
> +    uint8_t     bSeq;
> +} CCID_Header;
> +
> +typedef struct __attribute__ ((__packed__)) CCID_BULK_IN {
> +    CCID_Header hdr;
> +    uint8_t     bStatus;        /* Only used in BULK_IN */
> +    uint8_t     bError;         /* Only used in BULK_IN */
> +} CCID_BULK_IN;
> +
> +typedef struct __attribute__ ((__packed__)) CCID_SlotStatus {
> +    CCID_BULK_IN b;
> +    uint8_t     bClockStatus;
> +} CCID_SlotStatus;
> +
> +typedef struct __attribute__ ((__packed__)) CCID_Parameter {
> +    CCID_BULK_IN b;
> +    uint8_t     bProtocolNum;
> +    uint8_t     abProtocolDataStructure[0];
> +} CCID_Parameter;
> +
> +typedef struct __attribute__ ((__packed__)) CCID_DataBlock {
> +    CCID_BULK_IN b;
> +    uint8_t      bChainParameter;
> +    uint8_t      abData[0];
> +} CCID_DataBlock;
> +
> +/* 6.1.4 PC_to_RDR_XfrBlock */
> +typedef struct __attribute__ ((__packed__)) CCID_XferBlock {
> +    CCID_Header  hdr;
> +    uint8_t      bBWI; /* Block Waiting Timeout */
> +    uint16_t     wLevelParameter; /* XXX currently unused */
> +    uint8_t      abData[0];
> +} CCID_XferBlock;
> +
> +typedef struct __attribute__ ((__packed__)) CCID_IccPowerOn {
> +    CCID_Header hdr;
> +    uint8_t     bPowerSelect;
> +    uint16_t    abRFU;
> +} CCID_IccPowerOn;
> +
> +typedef struct __attribute__ ((__packed__)) CCID_IccPowerOff {
> +    CCID_Header hdr;
> +    uint16_t    abRFU;
> +} CCID_IccPowerOff;
> +
> +typedef struct __attribute__ ((__packed__)) CCID_SetParameter {
> +    CCID_Header hdr;
> +    uint8_t     bProtocolNum;
> +    uint8_t    abProtocolDataStructure[0];
> +} CCID_SetParameter;
> +
> +typedef struct CCID_Notify_Slot_Change {
> +    uint8_t     bMessageType; /* CCID_MESSAGE_TYPE_RDR_to_PC_NotifySlotChange */
> +    uint8_t     bmSlotICCState;
> +} CCID_Notify_Slot_Change;
> +
> +/* used for DataBlock response to XferBlock */
> +typedef struct Answer {
> +    uint8_t slot;
> +    uint8_t seq;
> +} Answer;
> +
> +/* pending BULK_IN messages */
> +typedef struct BulkIn {
> +    uint8_t  data[BULK_IN_BUF_SIZE];
> +    uint32_t len;
> +    uint32_t pos;
> +} BulkIn;
> +
> +enum {
> +    MIGRATION_NONE,
> +    MIGRATION_MIGRATED,
> +};
> +
> +typedef struct CCIDBus CCIDBus;
> +typedef struct USBCCIDState USBCCIDState;
> +
> +#define MAX_PROTOCOL_SIZE   7
> +
> +/**
> + * powered - defaults to true, changed by PowerOn/PowerOff messages
> + */
> +struct USBCCIDState {
> +    USBDevice dev;
> +    CCIDBus *bus;
> +    CCIDCardState *card;
> +    CCIDCardInfo *cardinfo; /* caching the info pointer */
> +    uint8_t  debug;
> +    BulkIn bulk_in_pending[BULK_IN_PENDING_NUM]; /* circular */
> +    uint32_t bulk_in_pending_start;
> +    uint32_t bulk_in_pending_end; /* first free */
> +    uint32_t bulk_in_pending_num;
> +    BulkIn *current_bulk_in;
> +    uint8_t  bulk_out_data[BULK_OUT_DATA_SIZE];
> +    uint32_t bulk_out_pos;
> +    uint8_t  bmSlotICCState;
> +    uint8_t  powered;
> +    uint8_t  notify_slot_change;
> +    uint64_t last_answer_error;
> +    Answer pending_answers[PENDING_ANSWERS_NUM];
> +    uint32_t pending_answers_start;
> +    uint32_t pending_answers_end;
> +    uint32_t pending_answers_num;
> +    uint8_t  bError;
> +    uint8_t  bmCommandStatus;
> +    uint8_t  bProtocolNum;
> +    uint8_t  abProtocolDataStructure[MAX_PROTOCOL_SIZE];
> +    uint32_t ulProtocolDataStructureSize;
> +    uint32_t state_vmstate;
> +    uint8_t  migration_state;
> +    uint32_t migration_target_ip;
> +    uint16_t migration_target_port;
> +};
> +
> +/* Slot specific variables. We emulate a single slot card reader.
> + */
> +
> +
> +/* CCID Spec chapter 4: CCID uses a standard device descriptor per Chapter 9,
> + * "USB Device Framework", section 9.6.1, in the Universal Serial Bus
> + * Specification.
> + *
> + * This device implemented based on the spec and with an Athena Smart Card
> + * Reader as reference:
> + *   0dc3:1004 Athena Smartcard Solutions, Inc.
> + */
> +
> +static const uint8_t qemu_ccid_dev_descriptor[] = {
> +        0x12,       /*  u8 bLength; */
> +        USB_DT_DEVICE, /*  u8 bDescriptorType; Device */
> +        0x10, 0x01, /*  u16 bcdUSB; v1.1 */
> +
> +        0x00,       /*  u8  bDeviceClass; */
> +        0x00,       /*  u8  bDeviceSubClass; */
> +        0x00,       /*  u8  bDeviceProtocol; [ low/full speeds only ] */
> +        0x40,       /*  u8  bMaxPacketSize0; 8 Bytes (valid: 8,16,32,64) */
> +
> +        /* Vendor and product id are arbitrary.  */
> +                    /*  u16 idVendor  */
> +        CCID_VENDOR_ID&  0xff, CCID_VENDOR_ID>>  8,
> +                    /*  u16 idProduct */
> +        CCID_PRODUCT_ID&  0xff, CCID_PRODUCT_ID>>  8,
> +                    /*  u16 bcdDevice */
> +        CCID_DEVICE_VERSION&  0xff, CCID_DEVICE_VERSION>>  8,
> +        0x01,       /*  u8  iManufacturer; */
> +        0x02,       /*  u8  iProduct; */
> +        0x03,       /*  u8  iSerialNumber; */
> +        0x01,       /*  u8  bNumConfigurations; */
> +};
> +
> +static const uint8_t qemu_ccid_config_descriptor[] = {
> +
> +        /* one configuration */
> +        0x09,       /*  u8  bLength; */
> +        USB_DT_CONFIG, /*  u8  bDescriptorType; Configuration */
> +        0x5d, 0x00, /*  u16 wTotalLength; 9+9+54+7+7+7 */
> +        0x01,       /*  u8  bNumInterfaces; (1) */
> +        0x01,       /*  u8  bConfigurationValue; */
> +        0x00,       /*  u8  iConfiguration; */
> +        0xe0,       /*  u8  bmAttributes;
> +                                 Bit 7: must be set,
> +                                     6: Self-powered,
> +                                     5: Remote wakeup,
> +                                     4..0: resvd */
> +        100/2,      /*  u8  MaxPower; 50 == 100mA */
> +
> +        /* one interface */
> +        0x09,       /*  u8  if_bLength; */
> +        USB_DT_INTERFACE, /*  u8  if_bDescriptorType; Interface */
> +        0x00,       /*  u8  if_bInterfaceNumber; */
> +        0x00,       /*  u8  if_bAlternateSetting; */
> +        0x03,       /*  u8  if_bNumEndpoints; */
> +        0x0b,       /*  u8  if_bInterfaceClass; Smart Card Device Class */
> +        0x00,       /*  u8  if_bInterfaceSubClass; Subclass code */
> +        0x00,       /*  u8  if_bInterfaceProtocol; Protocol code */
> +        0x04,       /*  u8  if_iInterface; Index of string descriptor */
> +
> +        /* Smart Card Device Class Descriptor */
> +        0x36,       /*  u8  bLength; */
> +        0x21,       /*  u8  bDescriptorType; Functional */
> +        0x10, 0x01, /*  u16 bcdCCID; CCID Specification Release Number. */
> +        0x00,       /*  u8  bMaxSlotIndex; The index of the highest available
> +                        slot on this device. All slots are consecutive starting
> +                        at 00h. */
> +        0x07,       /*  u8  bVoltageSupport; 01h - 5.0v, 02h - 3.0, 03 - 1.8 */
> +
> +        0x03, 0x00, /*  u32 dwProtocols; RRRR PPPP. RRRR = 0000h.*/
> +        0x00, 0x00, /*  PPPP: 0001h = Protocol T=0, 0002h = Protocol T=1 */
> +                    /*  u32 dwDefaultClock; in kHZ (0x0fa0 is 4 MHz) */
> +        0xa0, 0x0f, 0x00, 0x00,
> +                    /*  u32 dwMaximumClock; */
> +        0x00, 0x00, 0x01, 0x00,
> +        0x00,       /*  u8 bNumClockSupported; 0 means just the default and max. */
> +                    /*  u32 dwDataRate ;bps. 9600 == 00002580h */
> +        0x80, 0x25, 0x00, 0x00,
> +                    /*  u32 dwMaxDataRate ; 11520 bps == 0001C200h */
> +        0x00, 0xC2, 0x01, 0x00,
> +        0x00,       /*  u8  bNumDataRatesSupported; 00 means all rates between
> +                     *      default and max */
> +                    /*  u32 dwMaxIFSD; maximum IFSD supported by CCID for protocol
> +                     *      T=1 (Maximum seen from various cards) */
> +        0xfe, 0x00, 0x00, 0x00,
> +                    /*  u32 dwSyncProtocols; 1 - 2-wire, 2 - 3-wire, 4 - I2C */
> +        0x00, 0x00, 0x00, 0x00,
> +                    /*  u32 dwMechanical;  0 - no special characteristics. */
> +        0x00, 0x00, 0x00, 0x00,
> +                    /*  u32 dwFeatures;
> +                     *  0 - No special characteristics
> +                     *  + 2 Automatic parameter configuration based on ATR data
> +                     *  + 4 Automatic activation of ICC on inserting
> +                     *  + 8 Automatic ICC voltage selection
> +                     *  + 10 Automatic ICC clock frequency change
> +                     *  + 20 Automatic baud rate change
> +                     *  + 40 Automatic parameters negotiation made by the CCID
> +                     *  + 80 automatic PPS made by the CCID
> +                     *  100 CCID can set ICC in clock stop mode
> +                     *  200 NAD value other then 00 accepted (T=1 protocol)
> +                     *  + 400 Automatic IFSD exchange as first exchange (T=1)
> +                     *  One of the following only:
> +                     *  + 10000 TPDU level exchanges with CCID
> +                     *  20000 Short APDU level exchange with CCID
> +                     *  40000 Short and Extended APDU level exchange with CCID
> +                     *
> +                     *  + 100000 USB Wake up signaling supported on card insertion
> +                     *  and removal. Must set bit 5 in bmAttributes in Configuration
> +                     *  descriptor if 100000 is set.*/
> +        0xfe, 0x04, 0x11, 0x00,
> +                    /*  u32 dwMaxCCIDMessageLength; For extended APDU in [261 + 10
> +                     *  , 65544 + 10]. Otherwise the minimum is wMaxPacketSize of
> +                     *  the Bulk-OUT endpoint */
> +        0x12, 0x00, 0x01, 0x00,
> +        0xFF,       /*  u8  bClassGetResponse; Significant only for CCID that
> +                     *  offers an APDU level for exchanges. Indicates the default
> +                     *  class value used by the CCID when it sends a Get Response
> +                     *  command to perform the transportation of an APDU by T=0
> +                     *  protocol
> +                     *  FFh indicates that the CCID echos the class of the APDU.
> +                     */
> +        0xFF,       /*  u8  bClassEnvelope; EAPDU only. Envelope command for T=0 */
> +        0x00, 0x00, /*  u16 wLcdLayout; XXYY Number of lines (XX) and chars per
> +                     *  line for LCD display used for PIN entry. 0000 - no LCD */
> +        0x01,       /*  u8  bPINSupport; 01h PIN Verification,
> +                     *                   02h PIN Modification */
> +        0x01,       /*  u8  bMaxCCIDBusySlots; */
> +
> +        /* Interrupt-IN endpoint */
> +        0x07,       /*  u8  ep_bLength; */
> +                    /*  u8  ep_bDescriptorType; Endpoint */
> +        USB_DT_ENDPOINT,
> +                    /*  u8  ep_bEndpointAddress; IN Endpoint 1 */
> +        0x80 | CCID_INT_IN_EP,
> +        0x03,       /*  u8  ep_bmAttributes; Interrupt */
> +        0x40, 0x00, /*  u16 ep_wMaxPacketSize; */
> +        0xff,       /*  u8  ep_bInterval; */
> +
> +        /* Bulk-In endpoint */
> +        0x07,       /*  u8  ep_bLength; */
> +                    /*  u8  ep_bDescriptorType; Endpoint */
> +        USB_DT_ENDPOINT,
> +                    /*  u8  ep_bEndpointAddress; IN Endpoint 2 */
> +        0x80 | CCID_BULK_IN_EP,
> +        0x02,       /*  u8  ep_bmAttributes; Bulk */
> +        0x40, 0x00, /*  u16 ep_wMaxPacketSize; */
> +        0x00,       /*  u8  ep_bInterval; */
> +
> +        /* Bulk-Out endpoint */
> +        0x07,       /*  u8  ep_bLength; */
> +                    /*  u8  ep_bDescriptorType; Endpoint */
> +        USB_DT_ENDPOINT,
> +                    /*  u8  ep_bEndpointAddress; OUT Endpoint 3 */
> +        CCID_BULK_OUT_EP,
> +        0x02,       /*  u8  ep_bmAttributes; Bulk */
> +        0x40, 0x00, /*  u16 ep_wMaxPacketSize; */
> +        0x00,       /*  u8  ep_bInterval; */
> +
> +};
> +
> +static bool ccid_has_pending_answers(USBCCIDState *s)
> +{
> +    return s->pending_answers_num>  0;
> +}
> +
> +static void ccid_clear_pending_answers(USBCCIDState *s)
> +{
> +    s->pending_answers_num = 0;
> +    s->pending_answers_start = 0;
> +    s->pending_answers_end = 0;
> +}
> +
> +static void ccid_print_pending_answers(USBCCIDState *s)
> +{
> +#ifdef DEBUG_CCID
> +    Answer *answer;
> +    int i, count;
> +
> +    printf("usb-ccid: pending answers:");
> +    if (!ccid_has_pending_answers(s)) {
> +        printf(" empty\n");
> +        return;
> +    }
> +    for (i = s->pending_answers_start, count=s->pending_answers_num ;
> +         count>  0; count--, i++) {
> +        answer =&s->pending_answers[i % PENDING_ANSWERS_NUM];
> +        if (count == 1) {
> +            printf("%d:%d\n", answer->slot, answer->seq);
> +        } else {
> +            printf("%d:%d,", answer->slot, answer->seq);
> +        }
> +    }
> +#endif
>    

It's usually better to use a dprintf() instead of an #if block like 
this.  You'll be much more likely to notice when the debug code breaks 
which tends to happen over time.

> +}
> +
> +static void ccid_add_pending_answer(USBCCIDState *s, CCID_Header *hdr)
> +{
> +    Answer* answer;
> +
> +    assert(s->pending_answers_num++<  PENDING_ANSWERS_NUM);
>    

Having side effects in an assert statement is a very bad idea.

> +    answer =&s->pending_answers[(s->pending_answers_end++) % PENDING_ANSWERS_NUM];
> +    answer->slot = hdr->bSlot;
> +    answer->seq = hdr->bSeq;
> +    ccid_print_pending_answers(s);
> +}
> +
> +static void ccid_remove_pending_answer(USBCCIDState *s,
> +    uint8_t *slot, uint8_t *seq)
> +{
> +    Answer *answer;
> +
> +    assert(s->pending_answers_num-->  0);
> +    answer =&s->pending_answers[(s->pending_answers_start++) % PENDING_ANSWERS_NUM];
> +    *slot = answer->slot;
> +    *seq = answer->seq;
> +    ccid_print_pending_answers(s);
> +}
> +
> +static void ccid_bulk_in_clear(USBCCIDState *s)
> +{
> +    s->bulk_in_pending_start = 0;
> +    s->bulk_in_pending_end = 0;
> +    s->bulk_in_pending_num = 0;
> +}
> +
> +static void ccid_bulk_in_release(USBCCIDState *s)
> +{
> +    assert(s->current_bulk_in != NULL);
> +    s->current_bulk_in->pos = 0;
> +    s->current_bulk_in = NULL;
> +}
> +
> +static void ccid_bulk_in_get(USBCCIDState *s)
> +{
> +    if (s->current_bulk_in != NULL || s->bulk_in_pending_num == 0) {
> +        return;
> +    }
> +    assert(s->bulk_in_pending_num>  0);
> +    s->bulk_in_pending_num--;
> +    s->current_bulk_in =&s->bulk_in_pending[
> +        (s->bulk_in_pending_start++) % BULK_IN_PENDING_NUM];
> +}
> +
> +static void* ccid_reserve_recv_buf(USBCCIDState* s, uint16_t len)
> +{
> +    BulkIn* bulk_in;
> +
> +    DPRINTF(s, 4, "%s: QUEUE: reserve %d bytes\n", __func__, len);
> +
> +    /* look for an existing element */
> +    if (len>  BULK_IN_BUF_SIZE) {
> +        printf("usb-ccid.c: %s: len larger then max (%d>%d). discarding message.\n",
> +            __func__, len, BULK_IN_BUF_SIZE);
> +        return NULL;
> +    }
> +    if (s->bulk_in_pending_num>= BULK_IN_PENDING_NUM) {
> +        printf("usb-ccid.c: %s: No free bulk_in buffers. discarding message.\n",
> +                __func__);
> +        return NULL;
> +    }
>    

Looks like these are guest triggable printfs.  You should avoid that.

> +    bulk_in =&s->bulk_in_pending[(s->bulk_in_pending_end++) % BULK_IN_PENDING_NUM];
> +    s->bulk_in_pending_num++;
> +    bulk_in->len = len;
> +    return bulk_in->data;
> +}
> +
> +static void ccid_reset(USBCCIDState *s)
> +{
> +    ccid_bulk_in_clear(s);
> +    ccid_clear_pending_answers(s);
> +}
> +
> +static void ccid_detach(USBCCIDState *s)
> +{
> +    ccid_reset(s);
> +}
> +
> +static void ccid_handle_reset(USBDevice *dev)
> +{
> +    USBCCIDState *s = DO_UPCAST(USBCCIDState, dev, dev);
> +
> +    DPRINTF(s, 1, "Reset\n");
> +
> +    ccid_reset(s);
> +}
> +
> +static int ccid_handle_control(USBDevice *dev, int request, int value,
> +                                  int index, int length, uint8_t *data)
> +{
> +    USBCCIDState *s = DO_UPCAST(USBCCIDState, dev, dev);
> +    int ret = 0;
> +
> +    DPRINTF(s, 1, "got control %x, value %x\n",request, value);
> +    switch (request) {
> +    case DeviceRequest | USB_REQ_GET_STATUS:
> +        data[0] = (0<<  USB_DEVICE_SELF_POWERED) |
> +            (dev->remote_wakeup<<  USB_DEVICE_REMOTE_WAKEUP);
> +        data[1] = 0x00;
> +        ret = 2;
> +        break;
> +    case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
> +        if (value == USB_DEVICE_REMOTE_WAKEUP) {
> +            dev->remote_wakeup = 0;
> +        } else {
> +            goto fail;
> +        }
> +        ret = 0;
> +        break;
> +    case DeviceOutRequest | USB_REQ_SET_FEATURE:
> +        if (value == USB_DEVICE_REMOTE_WAKEUP) {
> +            dev->remote_wakeup = 1;
> +        } else {
> +            goto fail;
> +        }
> +        ret = 0;
> +        break;
> +    case DeviceOutRequest | USB_REQ_SET_ADDRESS:
> +        dev->addr = value;
> +        ret = 0;
> +        break;
> +    case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
> +        switch(value>>  8) {
> +        case USB_DT_DEVICE:
> +            memcpy(data, qemu_ccid_dev_descriptor,
> +                   sizeof(qemu_ccid_dev_descriptor));
> +            ret = sizeof(qemu_ccid_dev_descriptor);
> +            break;
> +        case USB_DT_CONFIG:
> +            memcpy(data, qemu_ccid_config_descriptor,
> +                   sizeof(qemu_ccid_config_descriptor));
> +            ret = sizeof(qemu_ccid_config_descriptor);
> +            break;
> +        case USB_DT_STRING:
> +            switch(value&  0xff) {
> +            case 0:
> +                /* language ids */
> +                data[0] = 4;
> +                data[1] = 3;
> +                data[2] = 0x09;
> +                data[3] = 0x04;
> +                ret = 4;
> +                break;
> +            case 1:
> +                /* vendor description */
> +                ret = set_usb_string(data, CCID_VENDOR_DESCRIPTION);
> +                break;
> +            case 2:
> +                /* product description */
> +                ret = set_usb_string(data, CCID_PRODUCT_DESCRIPTION);
> +                break;
> +            case 3:
> +                /* serial number */
> +                ret = set_usb_string(data, CCID_SERIAL_NUMBER_STRING);
> +                break;
> +            case 4:
> +                /* interface name */
> +                ret = set_usb_string(data, CCID_INTERFACE_NAME);
> +                break;
> +            default:
> +                goto fail;
> +            }
> +            break;
> +        default:
> +            goto fail;
> +        }
> +        break;
> +    case DeviceRequest | USB_REQ_GET_CONFIGURATION:
> +        data[0] = 1;
> +        ret = 1;
> +        break;
> +    case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
> +        /* Only one configuration - we just ignore the request */
> +        ret = 0;
> +        break;
> +    case DeviceRequest | USB_REQ_GET_INTERFACE:
> +        data[0] = 0;
> +        ret = 1;
> +        break;
> +    case InterfaceOutRequest | USB_REQ_SET_INTERFACE:
> +        ret = 0;
> +        break;
> +    case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
> +        ret = 0;
> +        break;
> +
> +        /* Class specific requests.  */
> +    case InterfaceOutClass | CCID_CONTROL_ABORT:
> +        DPRINTF(s, 1, "ccid_control abort UNIMPLEMENTED\n");
> +        ret = USB_RET_STALL;
> +        break;
> +    case InterfaceInClass | CCID_CONTROL_GET_CLOCK_FREQUENCIES:
> +        DPRINTF(s, 1, "ccid_control get clock frequencies UNIMPLEMENTED\n");
> +        ret = USB_RET_STALL;
> +        break;
> +    case InterfaceInClass | CCID_CONTROL_GET_DATA_RATES:
> +        DPRINTF(s, 1, "ccid_control get data rates UNIMPLEMENTED\n");
> +        ret = USB_RET_STALL;
> +        break;
> +    default:
> +    fail:
> +        DPRINTF(s, 1, "got unsupported/bogus control %x, value %x\n", request, value);
> +        ret = USB_RET_STALL;
> +        break;
> +    }
> +    return ret;
> +}
> +
> +static bool ccid_card_inserted(USBCCIDState *s)
> +{
> +    return s->bmSlotICCState&  SLOT_0_STATE_MASK;
> +}
> +
> +static uint8_t ccid_card_status(USBCCIDState *s)
> +{
> +    return ccid_card_inserted(s)
> +            ? (s->powered ?
> +                ICC_STATUS_PRESENT_ACTIVE
> +              : ICC_STATUS_PRESENT_INACTIVE
> +              )
> +            : ICC_STATUS_NOT_PRESENT;
> +}
> +
> +static uint8_t ccid_calc_status(USBCCIDState *s)
> +{
> +    /* page 55, 6.2.6, calculation of bStatus from bmICCStatus and
> +       bmCommandStatus
> +     */
> +    uint8_t ret = ccid_card_status(s) | (s->bmCommandStatus<<  6);
> +    DPRINTF(s, 4, "status = %d\n", ret);
> +    return ret;
> +}
> +
> +static void ccid_reset_error_status(USBCCIDState* s)
> +{
> +    s->bError = ERROR_CMD_NOT_SUPPORTED;
> +    s->bmCommandStatus = COMMAND_STATUS_NO_ERROR;
> +}
> +
> +static void ccid_write_slot_status(USBCCIDState* s, CCID_Header* recv)
> +{
> +    CCID_SlotStatus *h = ccid_reserve_recv_buf(s, sizeof(CCID_SlotStatus));
> +    if (h == NULL) {
> +        return;
> +    }
> +    h->b.hdr.bMessageType = CCID_MESSAGE_TYPE_RDR_to_PC_SlotStatus;
> +    h->b.hdr.dwLength = 0;
> +    h->b.hdr.bSlot = recv->bSlot;
> +    h->b.hdr.bSeq = recv->bSeq;
> +    h->b.bStatus = ccid_calc_status(s);
> +    h->b.bError = s->bError;
> +    h->bClockStatus = CLOCK_STATUS_RUNNING;
> +    ccid_reset_error_status(s);
> +}
> +
> +static void ccid_write_parameters(USBCCIDState* s, CCID_Header* recv)
> +{
> +    CCID_Parameter *h;
> +    uint32_t len = s->ulProtocolDataStructureSize;
> +
> +    h = ccid_reserve_recv_buf(s, sizeof(CCID_Parameter) + len);
> +    if (h == NULL) {
> +        return;
> +    }
> +    h->b.hdr.bMessageType = CCID_MESSAGE_TYPE_RDR_to_PC_Parameters;
> +    h->b.hdr.dwLength = 0;
> +    h->b.hdr.bSlot = recv->bSlot;
> +    h->b.hdr.bSeq = recv->bSeq;
> +    h->b.bStatus = ccid_calc_status(s);
> +    h->b.bError = s->bError;
> +    h->bProtocolNum = s->bProtocolNum;
> +    memcpy(h->abProtocolDataStructure, s->abProtocolDataStructure, len);
> +    ccid_reset_error_status(s);
> +}
> +
> +static void ccid_write_data_block(
> +    USBCCIDState* s, uint8_t slot, uint8_t seq,
> +    const uint8_t* data, uint32_t len)
> +{
> +    CCID_DataBlock *p = ccid_reserve_recv_buf(s, sizeof(*p) + len);
> +
> +    if (p == NULL) {
> +        return;
> +    }
> +    p->b.hdr.bMessageType = CCID_MESSAGE_TYPE_RDR_to_PC_DataBlock;
> +    p->b.hdr.dwLength = cpu_to_le32(len);
> +    p->b.hdr.bSlot = slot;
> +    p->b.hdr.bSeq = seq;
> +    p->b.bStatus = ccid_calc_status(s);
> +    p->b.bError = s->bError;
> +#ifdef DEBUG_CCID
> +    if (p->b.bError) {
> +        DPRINTF(s, 4, "error %d", p->b.bError);
> +    }
> +#endif
> +    memcpy(p->abData, data, len);
> +    ccid_reset_error_status(s);
> +}
> +
> +static void ccid_write_data_block_answer(USBCCIDState* s,
> +    const uint8_t* data, uint32_t len)
> +{
> +    uint8_t seq;
> +    uint8_t slot;
> +
> +    if (!ccid_has_pending_answers(s)) {
> +        abort();
> +    }
> +    ccid_remove_pending_answer(s,&slot,&seq);
> +    ccid_write_data_block(s, slot, seq, data, len);
> +}
> +
> +static void ccid_write_data_block_atr(USBCCIDState* s, CCID_Header* recv)
> +{
> +    const uint8_t *atr = NULL;
> +    uint32_t len = 0;
> +
> +    if (s->card) {
> +        atr = s->cardinfo->get_atr(s->card,&len);
> +    }
> +    ccid_write_data_block(s, recv->bSlot, recv->bSeq, atr, len);
> +}
> +
> +static void ccid_set_parameters(USBCCIDState *s, CCID_Header *recv)
> +{
> +    CCID_SetParameter *ph = (CCID_SetParameter *) recv;
> +    uint32_t len = 0;
> +    if (ph->bProtocolNum == 0) {
> +        len = 5;
> +    }
> +    if (ph->bProtocolNum == 1) {
> +        len = 7;
> +    }
> +    if (len == 0) {
> +        s->bmCommandStatus = COMMAND_STATUS_FAILED;
> +        s->bError = 7; /* Protocol invalid or not supported */
> +        return;
> +    }
> +    s->bProtocolNum = ph->bProtocolNum;
> +    memcpy(s->abProtocolDataStructure, ph->abProtocolDataStructure, len);
> +    s->ulProtocolDataStructureSize = len;
> +    DPRINTF(s, 1, "%s: using len %d\n", __func__, len);
> +}
> +
> +/* must be 5 bytes for T=0, 7 bytes for T=1
> + * See page 52 */
> +static const uint8_t abDefaultProtocolDataStructure[7] =
> +    { 0x77, 0x00, 0x00, 0x00, 0x00, 0xfe /*IFSC*/, 0x00 /*NAD*/ };
> +
> +static void ccid_reset_parameters(USBCCIDState *s)
> +{
> +   uint32_t len = sizeof(abDefaultProtocolDataStructure);
> +
> +   s->bProtocolNum = 1; /* T=1 */
> +   s->ulProtocolDataStructureSize = len;
> +   memcpy(s->abProtocolDataStructure, abDefaultProtocolDataStructure, len);
> +}
> +
> +static void ccid_report_error_failed(USBCCIDState *s, uint8_t error)
> +{
> +    s->bmCommandStatus = COMMAND_STATUS_FAILED;
> +    s->bError = error;
> +}
> +
> +/* NOTE: only a single slot is supported (SLOT_0)
> + */
> +static void ccid_on_slot_change(USBCCIDState* s, bool full)
> +{
> +    /* RDR_to_PC_NotifySlotChange, 6.3.1 page 56
> +     */
> +    uint8_t current = s->bmSlotICCState;
> +    if (full) {
> +        s->bmSlotICCState |= SLOT_0_STATE_MASK;
> +    } else {
> +        s->bmSlotICCState&= ~SLOT_0_STATE_MASK;
> +    }
> +    if (current != s->bmSlotICCState) {
> +        s->bmSlotICCState |= SLOT_0_CHANGED_MASK;
> +    }
> +    s->notify_slot_change = true;
> +}
> +
> +static void ccid_write_data_block_error(
> +    USBCCIDState *s, uint8_t slot, uint8_t seq)
> +{
> +    ccid_write_data_block(s, slot, seq, NULL, 0);
> +}
> +
> +static void ccid_on_apdu_from_guest(USBCCIDState *s, CCID_XferBlock *recv)
> +{
> +    uint32_t len;
> +
> +    if (ccid_card_status(s) != ICC_STATUS_PRESENT_ACTIVE) {
> +        DPRINTF(s, 1, "usb-ccid: not sending apdu to client, no card connected\n");
> +        ccid_write_data_block_error(s, recv->hdr.bSlot, recv->hdr.bSeq);
> +        return;
> +    }
> +    len = le32_to_cpu(recv->hdr.dwLength);
> +    DPRINTF(s, 1, "%s: seq %d, len %d\n", __FUNCTION__,
> +                recv->hdr.bSeq, len);
> +    ccid_add_pending_answer(s, (CCID_Header*)recv);
> +    if (s->card) {
> +        s->cardinfo->apdu_from_guest(s->card, recv->abData, len);
> +    } else {
> +        printf("warning: discarded apdu\n");
>    

Guest triggerable printf?

> +    }
> +}
> +
> +/* handle a single USB_TOKEN_OUT, return value returned to guest.
> + * 0 - all ok
> + * USB_RET_STALL - failed to handle packet */
> +static int ccid_handle_bulk_out(USBCCIDState *s, USBPacket *p)
> +{
> +    CCID_Header* ccid_header;
> +
> +    if (p->len + s->bulk_out_pos>  BULK_OUT_DATA_SIZE) {
> +        return USB_RET_STALL;
> +    }
> +    ccid_header = (CCID_Header*)s->bulk_out_data;
> +    memcpy(s->bulk_out_data + s->bulk_out_pos, p->data, p->len);
> +    s->bulk_out_pos += p->len;
> +    if (p->len == 64) {
> +        DPRINTF(s, 4, "usb-ccid: bulk_in: expecting more packets (%d/%d)\n",
> +            p->len, ccid_header->dwLength);
> +        return 0;
> +    }
> +    if (s->bulk_out_pos<  10) {
> +        DPRINTF(s, 1, "%s: bad USB_TOKEN_OUT length, should be at least 10 bytes\n", __func__);
> +    } else {
> +        DPRINTF(s, 3, "%s %x\n", __func__, ccid_header->bMessageType);
> +        switch (ccid_header->bMessageType) {
> +            case CCID_MESSAGE_TYPE_PC_to_RDR_GetSlotStatus:
> +                ccid_write_slot_status(s, ccid_header);
> +                break;
> +            case CCID_MESSAGE_TYPE_PC_to_RDR_IccPowerOn:
> +                DPRINTF(s, 1, "PowerOn: %d\n",
> +                    ((CCID_IccPowerOn*)(ccid_header))->bPowerSelect);
> +                s->powered = true;
> +                if (!ccid_card_inserted(s)) {
> +                    ccid_report_error_failed(s, ERROR_ICC_MUTE);
> +                }
> +                /* atr is written regardless of error. */
> +                ccid_write_data_block_atr(s, ccid_header);
> +                break;
> +            case CCID_MESSAGE_TYPE_PC_to_RDR_IccPowerOff:
> +                DPRINTF(s, 1, "PowerOff\n");
> +                ccid_reset_error_status(s);
> +                s->powered = false;
> +                ccid_write_slot_status(s, ccid_header);
> +                break;
> +            case CCID_MESSAGE_TYPE_PC_to_RDR_XfrBlock:
> +                ccid_on_apdu_from_guest(s, (CCID_XferBlock*)s->bulk_out_data);
> +                break;
> +            case CCID_MESSAGE_TYPE_PC_to_RDR_SetParameters:
> +                ccid_reset_error_status(s);
> +                ccid_set_parameters(s, ccid_header);
> +                ccid_write_parameters(s, ccid_header);
> +                break;
> +            case CCID_MESSAGE_TYPE_PC_to_RDR_ResetParameters:
> +                ccid_reset_error_status(s);
> +                ccid_reset_parameters(s);
> +                ccid_write_parameters(s, ccid_header);
> +                break;
> +            case CCID_MESSAGE_TYPE_PC_to_RDR_GetParameters:
> +                ccid_reset_error_status(s);
> +                ccid_write_parameters(s, ccid_header);
> +                break;
> +            default:
> +                DPRINTF(s, 1, "handle_data: ERROR: unhandled message type %Xh\n",
> +                    ccid_header->bMessageType);
> +                /* the caller is expecting the device to respond, tell it we
> +                 * do't support the operation */
> +                ccid_report_error_failed(s, ERROR_CMD_NOT_SUPPORTED);
> +                ccid_write_slot_status(s, ccid_header);
> +                break;
> +        }
> +    }
> +    s->bulk_out_pos = 0;
> +    return 0;
> +}
> +
> +static int ccid_bulk_in_copy_to_guest(USBCCIDState *s, uint8_t *data, int len)
> +{
> +    int ret = 0;
> +
> +    assert(len>0);
> +    ccid_bulk_in_get(s);
> +    if (s->current_bulk_in != NULL) {
> +        ret = MIN(s->current_bulk_in->len - s->current_bulk_in->pos, len);
> +        memcpy(data, s->current_bulk_in->data + s->current_bulk_in->pos, ret);
> +        s->current_bulk_in->pos += ret;
> +        if (s->current_bulk_in->pos == s->current_bulk_in->len) {
> +            ccid_bulk_in_release(s);
> +        }
> +    } else {
> +        ret = USB_RET_NAK; /* return when device has no data - usb 2.0 spec Table 8-4 */
> +    }
> +    if (ret>  0) {
> +        DPRINTF(s, 3, "%s: %d/%d req/act to guest (BULK_IN)\n", __func__, len, ret);
> +    }
> +    if (ret != USB_RET_NAK&&  ret<  len) {
> +        DPRINTF(s, 1, "%s: returning short (EREMOTEIO) %d<  %d\n", __func__, ret, len);
> +    }
> +    return ret;
> +}
> +
> +static int ccid_handle_data(USBDevice *dev, USBPacket *p)
> +{
> +    USBCCIDState *s = DO_UPCAST(USBCCIDState, dev, dev);
> +    int ret = 0;
> +    uint8_t *data = p->data;
> +    int len = p->len;
> +
> +    switch (p->pid) {
> +    case USB_TOKEN_OUT:
> +        ret = ccid_handle_bulk_out(s, p);
> +        break;
> +
> +    case USB_TOKEN_IN:
> +        switch (p->devep&  0xf) {
> +            case CCID_BULK_IN_EP:
> +                if (!len) {
> +                    ret = USB_RET_NAK;
> +                } else {
> +                    ret = ccid_bulk_in_copy_to_guest(s, data, len);
> +                }
> +                break;
> +            case CCID_INT_IN_EP:
> +                if (s->notify_slot_change) {
> +                    /* page 56, RDR_to_PC_NotifySlotChange */
> +                    data[0] = CCID_MESSAGE_TYPE_RDR_to_PC_NotifySlotChange;
> +                    data[1] = s->bmSlotICCState;
> +                    ret = 2;
> +                    s->notify_slot_change = false;
> +                    s->bmSlotICCState&= ~SLOT_0_CHANGED_MASK;
> +                    DPRINTF(s, 2, "handle_data: int_in: notify_slot_change %X, requested len %d\n",
> +                            s->bmSlotICCState, len);
> +                }
> +                break;
> +            default:
> +                DPRINTF(s, 1, "Bad endpoint\n");
> +                break;
> +        }
> +        break;
> +    default:
> +        DPRINTF(s, 1, "Bad token\n");
> +        ret = USB_RET_STALL;
> +        break;
> +    }
> +
> +    return ret;
> +}
> +
> +static void ccid_handle_destroy(USBDevice *dev)
> +{
> +    USBCCIDState *s = DO_UPCAST(USBCCIDState, dev, dev);
> +
> +    ccid_bulk_in_clear(s);
> +}
> +
> +static void ccid_flush_pending_answers(USBCCIDState *s) {
> +    while (ccid_has_pending_answers(s)) {
> +        ccid_write_data_block_answer(s, NULL, 0);
> +    }
> +}
> +
> +static Answer *ccid_peek_next_answer(USBCCIDState *s)
> +{
> +    return s->pending_answers_num == 0
> +        ? NULL
> +        :&s->pending_answers[s->pending_answers_start % PENDING_ANSWERS_NUM];
> +}
> +
> +static void ccid_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent)
> +{
> +    CCIDCardState *card = DO_UPCAST(CCIDCardState, qdev, qdev);
> +    CCIDCardInfo *info = DO_UPCAST(CCIDCardInfo, qdev, qdev->info);
> +
> +    if (info->print) {
> +        info->print(mon, card, indent);
> +    }
> +}
> +
> +struct CCIDBus {
> +    BusState qbus;
> +};
> +
> +static struct BusInfo ccid_bus_info = {
> +    .name = "ccid-bus",
> +    .size = sizeof(CCIDBus),
> +    .print_dev = ccid_bus_dev_print,
> +    .props = (Property[]) {
> +        DEFINE_PROP_UINT32("slot", struct CCIDCardState, slot, 0),
> +        DEFINE_PROP_END_OF_LIST(),
> +    }
> +};
> +
> +static CCIDBus *ccid_bus_new(DeviceState *dev)
> +{
> +    CCIDBus *bus;
> +
> +    bus = FROM_QBUS(CCIDBus, qbus_create(&ccid_bus_info, dev, NULL));
> +    bus->qbus.allow_hotplug = 1;
> +
> +    return bus;
> +}
> +
> +void ccid_card_send_apdu_to_guest(CCIDCardState *card, uint8_t* apdu, uint32_t len)
> +{
> +    USBCCIDState *s = DO_UPCAST(USBCCIDState, dev.qdev, card->qdev.parent_bus->parent);
> +    Answer *answer;
> +
> +    if (!ccid_has_pending_answers(s)) {
> +        DPRINTF(s, 1, "CCID ERROR: got an APDU without pending answers\n");
> +        return;
> +    }
> +    s->bmCommandStatus = COMMAND_STATUS_NO_ERROR;
> +    answer = ccid_peek_next_answer(s);
> +    if (answer == NULL) {
> +        abort();
> +    }
> +    DPRINTF(s, 1, "APDU returned to guest %d (answer seq %d, slot %d)\n",
> +        len, answer->seq, answer->slot);
> +    ccid_write_data_block_answer(s, apdu, len);
> +}
> +
> +void ccid_card_card_removed(CCIDCardState *card)
> +{
> +    USBCCIDState *s = DO_UPCAST(USBCCIDState, dev.qdev, card->qdev.parent_bus->parent);
> +
> +    ccid_on_slot_change(s, false);
> +    ccid_flush_pending_answers(s);
> +    ccid_reset(s);
> +}
> +
> +int ccid_card_ccid_attach(CCIDCardState *card)
> +{
> +    USBCCIDState *s = DO_UPCAST(USBCCIDState, dev.qdev, card->qdev.parent_bus->parent);
> +
> +    DPRINTF(s, 1, "CCID Attach\n");
> +    if (s->migration_state == MIGRATION_MIGRATED) {
> +        s->migration_state = MIGRATION_NONE;
> +    }
> +    return 0;
> +}
> +
> +void ccid_card_ccid_detach(CCIDCardState *card)
> +{
> +    USBCCIDState *s = DO_UPCAST(USBCCIDState, dev.qdev, card->qdev.parent_bus->parent);
> +
> +    DPRINTF(s, 1, "CCID Detach\n");
> +    if (ccid_card_inserted(s)) {
> +        ccid_on_slot_change(s, false);
> +    }
> +    ccid_detach(s);
> +}
> +
> +void ccid_card_card_error(CCIDCardState *card, uint64_t error)
> +{
> +    USBCCIDState *s = DO_UPCAST(USBCCIDState, dev.qdev, card->qdev.parent_bus->parent);
> +
> +    s->bmCommandStatus = COMMAND_STATUS_FAILED;
> +    s->last_answer_error = error;
> +    DPRINTF(s, 1, "VSC_Error: %lX\n", s->last_answer_error);
> +    /* TODO: these error's should be more verbose and propogated to the guest.
> +     * */
> +    ccid_write_data_block_answer(s, NULL, 0);
> +}
> +
> +void ccid_card_card_inserted(CCIDCardState *card)
> +{
> +    USBCCIDState *s = DO_UPCAST(USBCCIDState, dev.qdev, card->qdev.parent_bus->parent);
> +
> +    s->bmCommandStatus = COMMAND_STATUS_NO_ERROR;
> +    ccid_flush_pending_answers(s);
> +    ccid_on_slot_change(s, true);
> +}
> +
> +static int ccid_card_exit(DeviceState *qdev)
> +{
> +    int ret = 0;
> +    CCIDCardState *card = DO_UPCAST(CCIDCardState, qdev, qdev);
> +    CCIDCardInfo *info = DO_UPCAST(CCIDCardInfo, qdev, qdev->info);
> +    USBCCIDState *s = DO_UPCAST(USBCCIDState, dev.qdev, card->qdev.parent_bus->parent);
> +
> +    if (ccid_card_inserted(s)) {
> +        ccid_card_card_removed(card);
> +    }
> +    if (info->exitfn) {
> +        ret = info->exitfn(card);
> +    }
> +    s->card = NULL;
> +    s->cardinfo = NULL;
> +    return ret;
> +}
> +
> +static int ccid_card_init(DeviceState *qdev, DeviceInfo *base)
> +{
> +    CCIDCardState *card = DO_UPCAST(CCIDCardState, qdev, qdev);
> +    CCIDCardInfo *info = DO_UPCAST(CCIDCardInfo, qdev, base);
> +    USBCCIDState *s = DO_UPCAST(USBCCIDState, dev.qdev, card->qdev.parent_bus->parent);
> +    int ret = 0;
> +
> +    if (card->slot != 0) {
> +        fprintf(stderr, "Warning: usb-ccid supports one slot, can't add %d",
> +                card->slot);
>    

I think error_report is more appropriate here.  That makes it visible 
over QMP.

> +        return -1;
> +    }
> +    if (s->card != NULL) {
> +        fprintf(stderr, "Warning: usb-ccid card already full, not adding\n");
> +        return -1;
> +    }
> +    ret = info->initfn ? info->initfn(card) : ret;
> +    if (ret == 0) {
> +        s->card = card;
> +        s->cardinfo = info;
> +    }
> +    return ret;
> +}
> +
> +void ccid_card_qdev_register(CCIDCardInfo *card)
> +{
> +    card->qdev.bus_info =&ccid_bus_info;
> +    card->qdev.init = ccid_card_init;
> +    card->qdev.exit = ccid_card_exit;
> +    qdev_register(&card->qdev);
> +}
> +
> +static int ccid_initfn(USBDevice *dev)
> +{
> +    USBCCIDState *s = DO_UPCAST(USBCCIDState, dev, dev);
> +
> +    s->bus = ccid_bus_new(&dev->qdev);
> +    s->card = NULL;
> +    s->cardinfo = NULL;
> +    s->migration_state = MIGRATION_NONE;
> +    s->migration_target_ip = 0;
> +    s->migration_target_port = 0;
> +    s->dev.speed = USB_SPEED_FULL;
> +    s->notify_slot_change = false;
> +    s->powered = true;
> +    s->pending_answers_num = 0;
> +    s->last_answer_error = 0;
> +    s->bulk_in_pending_start = 0;
> +    s->bulk_in_pending_end = 0;
> +    s->current_bulk_in = NULL;
> +    ccid_reset_error_status(s);
> +    s->bulk_out_pos = 0;
> +    ccid_reset_parameters(s);
> +    ccid_reset(s);
> +    return 0;
> +}
> +
> +#ifdef ENABLE_MIGRATION
>    

Why is migration conditional?

> +static int ccid_post_load(void *opaque, int version_id)
> +{
> +    USBCCIDState *s = opaque;
> +
> +    // This must be done after usb_device_attach, which sets state to ATTACHED,
> +    // while it must be DEFAULT in order to accept packets (like it is after
> +    // reset, but reset will reset our addr and call our reset handler which
> +    // may change state, and we don't want to do that when migrating).
> +    s->dev.state = s->state_vmstate;
> +    return 0;
> +}
> +
> +static void ccid_pre_save(void *opaque)
> +{
> +    USBCCIDState *s = opaque;
> +
> +    s->state_vmstate = s->dev.state;
> +    if (s->dev.attached) {
> +        // migrating an open device, ignore reconnection CHR_EVENT to avoid an
> +        // erronous detach.
> +        s->migration_state = MIGRATION_MIGRATED;
> +    }
> +}
> +
> +static VMStateDescription bulk_in_vmstate = {
> +    .name = "CCID BulkIn state",
> +    .version_id = 1,
> +    .minimum_version_id = 1,
> +    .fields = (VMStateField []) {
> +        VMSTATE_BUFFER(data, BulkIn),
> +        VMSTATE_UINT32(len, BulkIn),
> +        VMSTATE_UINT32(pos, BulkIn),
> +        VMSTATE_END_OF_LIST()
> +    }
> +};
> +
> +static VMStateDescription answer_vmstate = {
> +    .name = "CCID Answer state",
> +    .version_id = 1,
> +    .minimum_version_id = 1,
> +    .fields = (VMStateField []) {
> +        VMSTATE_UINT8(slot, Answer),
> +        VMSTATE_UINT8(seq, Answer),
> +        VMSTATE_END_OF_LIST()
> +    }
> +};
> +
> +static VMStateDescription usb_device_vmstate = {
> +    .name = "usb_device",
> +    .version_id = 1,
> +    .minimum_version_id = 1,
> +    .fields = (VMStateField []) {
> +        VMSTATE_UINT8(addr, USBDevice),
> +        VMSTATE_BUFFER(setup_buf, USBDevice),
> +        VMSTATE_BUFFER(data_buf, USBDevice),
> +        VMSTATE_END_OF_LIST()
> +    }
> +};
> +
> +static VMStateDescription ccid_vmstate = {
> +    .name = CCID_DEV_NAME,
> +    .version_id = 1,
> +    .minimum_version_id = 1,
> +    .post_load = ccid_post_load,
> +    .pre_save = ccid_pre_save,
> +    .fields = (VMStateField []) {
> +        VMSTATE_STRUCT(dev, USBCCIDState, 1, usb_device_vmstate, USBDevice),
> +        VMSTATE_UINT8(debug, USBCCIDState),
> +        VMSTATE_BUFFER(bulk_out_data, USBCCIDState),
> +        VMSTATE_UINT32(bulk_out_pos, USBCCIDState),
> +        VMSTATE_UINT8(bmSlotICCState, USBCCIDState),
> +        VMSTATE_UINT8(powered, USBCCIDState),
> +        VMSTATE_UINT8(notify_slot_change, USBCCIDState),
> +        VMSTATE_UINT64(last_answer_error, USBCCIDState),
> +        VMSTATE_UINT8(bError, USBCCIDState),
> +        VMSTATE_UINT8(bmCommandStatus, USBCCIDState),
> +        VMSTATE_UINT8(bProtocolNum, USBCCIDState),
> +        VMSTATE_BUFFER(abProtocolDataStructure, USBCCIDState),
> +        VMSTATE_UINT32(ulProtocolDataStructureSize, USBCCIDState),
> +        VMSTATE_STRUCT_ARRAY(bulk_in_pending, USBCCIDState,
> +                       BULK_IN_PENDING_NUM, 1, bulk_in_vmstate, BulkIn),
> +        VMSTATE_UINT32(bulk_in_pending_start, USBCCIDState),
> +        VMSTATE_UINT32(bulk_in_pending_end, USBCCIDState),
> +        VMSTATE_STRUCT_ARRAY(pending_answers, USBCCIDState,
> +                        PENDING_ANSWERS_NUM, 1, answer_vmstate, Answer),
> +        VMSTATE_UINT32(pending_answers_num, USBCCIDState),
> +        VMSTATE_UINT8(migration_state, USBCCIDState),
> +        VMSTATE_UINT32(state_vmstate, USBCCIDState),
> +        VMSTATE_END_OF_LIST()
> +    }
> +};
> +#endif // ENABLE_MIGRATION
> +
> +static struct USBDeviceInfo ccid_info = {
> +    .product_desc   = "QEMU USB CCID",
> +    .qdev.name      = CCID_DEV_NAME,
> +    .qdev.size      = sizeof(USBCCIDState),
> +    .init           = ccid_initfn,
> +    .handle_packet  = usb_generic_handle_packet,
> +    .handle_reset   = ccid_handle_reset,
> +    .handle_control = ccid_handle_control,
> +    .handle_data    = ccid_handle_data,
> +    .handle_destroy = ccid_handle_destroy,
> +    .usbdevice_name = "ccid",
> +    .qdev.props     = (Property[]) {
> +        DEFINE_PROP_UINT8("debug", USBCCIDState, debug, 0),
> +        DEFINE_PROP_END_OF_LIST(),
> +    },
> +#ifdef ENABLE_MIGRATION
> +    .qdev.vmsd      =&ccid_vmstate,
> +#endif
> +};
> +
> +
> +static void ccid_register_devices(void)
> +{
> +    usb_qdev_register(&ccid_info);
> +}
> +device_init(ccid_register_devices)
>    

Regards,

Anthony Liguori