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[Xen-devel] Re: [Qemu-devel] [PATCH V6 06/15] xen: Add the Xen platform

To: Anthony.Perard@xxxxxxxxxx
Subject: [Xen-devel] Re: [Qemu-devel] [PATCH V6 06/15] xen: Add the Xen platform pci device
From: Alexander Graf <agraf@xxxxxxx>
Date: Mon, 15 Nov 2010 11:57:41 +0100
Cc: Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, QEMU-devel <qemu-devel@xxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Steven Smith <ssmith@xxxxxxxxxxxxx>
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On 21.10.2010, at 19:36, Anthony.Perard@xxxxxxxxxx wrote:

> From: Steven Smith <ssmith@xxxxxxxxxxxxx>
> 
> Introduce a new emulated PCI device, specific to fully virtualized Xen
> guests.  The device is necessary for PV on HVM drivers to work.
> 
> Signed-off-by: Steven Smith <ssmith@xxxxxxxxxxxxx>
> Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> ---
> Makefile.target     |    1 +
> hw/hw.h             |    3 +
> hw/pci_ids.h        |    2 +
> hw/xen_machine_fv.c |    3 +
> hw/xen_platform.c   |  431 +++++++++++++++++++++++++++++++++++++++++++++++++++
> hw/xen_platform.h   |    8 +
> 6 files changed, 448 insertions(+), 0 deletions(-)
> create mode 100644 hw/xen_platform.c
> create mode 100644 hw/xen_platform.h
> 
> diff --git a/Makefile.target b/Makefile.target
> index 644cafa..db84edb 100644
> --- a/Makefile.target
> +++ b/Makefile.target
> @@ -192,6 +192,7 @@ obj-$(CONFIG_NO_XEN) += xen-stub.o
> 
> # xen full virtualized machine
> obj-i386-$(CONFIG_XEN) += xen_machine_fv.o
> +obj-i386-$(CONFIG_XEN) += xen_platform.o
> 
> # USB layer
> obj-$(CONFIG_USB_OHCI) += usb-ohci.o
> diff --git a/hw/hw.h b/hw/hw.h
> index 4405092..67f3369 100644
> --- a/hw/hw.h
> +++ b/hw/hw.h
> @@ -653,6 +653,9 @@ extern const VMStateDescription vmstate_i2c_slave;
> #define VMSTATE_INT32_LE(_f, _s)                                   \
>     VMSTATE_SINGLE(_f, _s, 0, vmstate_info_int32_le, int32_t)
> 
> +#define VMSTATE_UINT8_TEST(_f, _s, _t)                               \
> +    VMSTATE_SINGLE_TEST(_f, _s, _t, 0, vmstate_info_uint8, uint8_t)
> +
> #define VMSTATE_UINT16_TEST(_f, _s, _t)                               \
>     VMSTATE_SINGLE_TEST(_f, _s, _t, 0, vmstate_info_uint16, uint16_t)
> 
> diff --git a/hw/pci_ids.h b/hw/pci_ids.h
> index 39e9f1d..1f2e0dd 100644
> --- a/hw/pci_ids.h
> +++ b/hw/pci_ids.h
> @@ -105,3 +105,5 @@
> #define PCI_DEVICE_ID_INTEL_82371AB      0x7111
> #define PCI_DEVICE_ID_INTEL_82371AB_2    0x7112
> #define PCI_DEVICE_ID_INTEL_82371AB_3    0x7113
> +
> +#define PCI_VENDOR_ID_XENSOURCE          0x5853
> diff --git a/hw/xen_machine_fv.c b/hw/xen_machine_fv.c
> index 260cda3..39ee7c7 100644
> --- a/hw/xen_machine_fv.c
> +++ b/hw/xen_machine_fv.c
> @@ -35,6 +35,7 @@
> 
> #include "xen_common.h"
> #include "xen/hvm/hvm_info_table.h"
> +#include "xen_platform.h"
> 
> #define MAX_IDE_BUS 2
> 
> @@ -88,6 +89,8 @@ static void xen_init_fv(ram_addr_t ram_size,
> 
>     pc_vga_init(pci_bus);
> 
> +    pci_xen_platform_init(pci_bus);
> +
>     /* init basic PC hardware */
>     pc_basic_device_init(isa_irq, &floppy_controller, &rtc_state);
> 
> diff --git a/hw/xen_platform.c b/hw/xen_platform.c
> new file mode 100644
> index 0000000..7551c81
> --- /dev/null
> +++ b/hw/xen_platform.c
> @@ -0,0 +1,431 @@
> +/*
> + * XEN platform pci device, formerly known as the event channel device
> + *
> + * Copyright (c) 2003-2004 Intel Corp.
> + * Copyright (c) 2006 XenSource
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a 
> copy
> + * of this software and associated documentation files (the "Software"), to 
> deal
> + * in the Software without restriction, including without limitation the 
> rights
> + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
> + * copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
> FROM,
> + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
> + * THE SOFTWARE.
> + */
> +
> +#include "hw.h"
> +#include "pc.h"
> +#include "pci.h"
> +#include "irq.h"
> +#include "xen_common.h"
> +#include "net.h"
> +#include "xen_platform.h"
> +#include "xen_backend.h"
> +#include "qemu-log.h"
> +#include "rwhandler.h"
> +
> +#include <assert.h>
> +#include <xenguest.h>
> +
> +//#define DEBUG_PLATFORM
> +
> +#ifdef DEBUG_PLATFORM
> +#define DPRINTF(fmt, ...) do { \
> +    fprintf(stderr, "xen_platform: " fmt, ## __VA_ARGS__); \
> +} while (0)
> +#else
> +#define DPRINTF(fmt, ...) do { } while (0)
> +#endif
> +
> +#define PFFLAG_ROM_LOCK 1 /* Sets whether ROM memory area is RW or RO */
> +
> +typedef struct PCIXenPlatformState {
> +    PCIDevice  pci_dev;
> +    uint8_t flags; /* used only for version_id == 2 */
> +    int drivers_blacklisted;
> +    uint16_t driver_product_version;
> +
> +    /* Log from guest drivers */
> +    int throttling_disabled;
> +    char log_buffer[4096];
> +    int log_buffer_off;
> +} PCIXenPlatformState;
> +
> +#define XEN_PLATFORM_IOPORT 0x10
> +
> +/* We throttle access to dom0 syslog, to avoid DOS attacks.  This is
> +   modelled as a token bucket, with one token for every byte of log.
> +   The bucket size is 128KB (->1024 lines of 128 bytes each) and
> +   refills at 256B/s.  It starts full.  The guest is blocked if no
> +   tokens are available when it tries to generate a log message. */
> +#define BUCKET_MAX_SIZE (128*1024)
> +#define BUCKET_FILL_RATE 256
> +
> +static void throttle(PCIXenPlatformState *s, unsigned count)
> +{
> +    static unsigned available;
> +    static int64_t last_refill;
> +    static int started;
> +    static int warned;
> +
> +    int64_t waiting_for, now;
> +    int64_t delay;
> +
> +    if (s->throttling_disabled) {
> +        return;
> +    }
> +
> +    if (!started) {
> +        last_refill = qemu_get_clock_ns(rt_clock);
> +        available = BUCKET_MAX_SIZE;
> +        started = 1;
> +    }
> +
> +    if (count > BUCKET_MAX_SIZE) {
> +        DPRINTF("tried to get %u tokens, but bucket size is %u\n",
> +                BUCKET_MAX_SIZE, count);
> +        exit(1);
> +    }
> +
> +    if (available < count) {
> +        /* The bucket is empty.  Refill it */
> +
> +        /* When will it be full enough to handle this request? */
> +        delay = muldiv64(count - available, 1000000000, BUCKET_FILL_RATE);
> +
> +        waiting_for = last_refill + delay;
> +
> +        /* How long do we have to wait? (might be negative) */
> +        waiting_for = waiting_for - qemu_get_clock_ns(rt_clock);
> +
> +        /* Wait for it. */
> +        if (waiting_for > 0) {
> +            struct timespec ts;
> +            if (!warned) {
> +                DPRINTF("throttling guest access to syslog");
> +                warned = 1;
> +            }
> +            ts.tv_sec = waiting_for / 1000000000;
> +            ts.tv_nsec = waiting_for % 1000000000;
> +            while (nanosleep(&ts, &ts) < 0 && errno == EINTR) {
> +            }
> +        }
> +
> +        /* Refill */
> +        now = qemu_get_clock_ns(rt_clock);
> +        available += muldiv64(now - last_refill,
> +                              BUCKET_FILL_RATE,
> +                              1000000000);
> +        if (available > BUCKET_MAX_SIZE) {
> +            available = BUCKET_MAX_SIZE;
> +        }
> +        last_refill = now;
> +    }
> +
> +    assert(available >= count);
> +
> +    available -= count;
> +}
> +
> +/* Xen Platform, Fixed IOPort */
> +
> +static void platform_fixed_ioport_writew(void *opaque, uint32_t addr, 
> uint32_t val)
> +{
> +    PCIXenPlatformState *s = opaque;
> +
> +    switch (addr - XEN_PLATFORM_IOPORT) {
> +    case 0:
> +        /* TODO: */
> +        /* Unplug devices.  Value is a bitmask of which devices to
> +           unplug, with bit 0 the IDE devices, bit 1 the network
> +           devices, and bit 2 the non-primary-master IDE devices. */
> +        break;
> +    case 2:
> +        switch (val) {
> +        case 1:
> +            DPRINTF("Citrix Windows PV drivers loaded in guest\n");
> +            break;
> +        case 0:
> +            DPRINTF("Guest claimed to be running PV product 0?\n");
> +            break;
> +        default:
> +            DPRINTF("Unknown PV product %d loaded in guest\n", val);
> +            break;
> +        }
> +        s->driver_product_version = val;
> +        break;
> +    }
> +}
> +
> +static void platform_fixed_ioport_writel(void *opaque, uint32_t addr,
> +                                         uint32_t val)
> +{
> +    switch (addr - XEN_PLATFORM_IOPORT) {
> +    case 0:
> +        /* PV driver version */
> +        break;
> +    }
> +}
> +
> +static void platform_fixed_ioport_writeb(void *opaque, uint32_t addr, 
> uint32_t val)
> +{
> +    PCIXenPlatformState *s = opaque;
> +
> +    switch (addr - XEN_PLATFORM_IOPORT) {
> +    case 0: /* Platform flags */ {
> +        hvmmem_type_t mem_type = (val & PFFLAG_ROM_LOCK) ?
> +            HVMMEM_ram_ro : HVMMEM_ram_rw;
> +        if (xc_hvm_set_mem_type(xen_xc, xen_domid, mem_type, 0xc0, 0x40)) {
> +            DPRINTF("unable to change ro/rw state of ROM memory area!\n");
> +        } else {
> +            s->flags = val & PFFLAG_ROM_LOCK;
> +            DPRINTF("changed ro/rw state of ROM memory area. now is %s 
> state.\n",
> +                    (mem_type == HVMMEM_ram_ro ? "ro":"rw"));
> +        }
> +        break;
> +    }
> +    case 2:
> +        /* Send bytes to syslog */
> +        if (val == '\n' || s->log_buffer_off == sizeof(s->log_buffer) - 1) {
> +            /* Flush buffer */
> +            s->log_buffer[s->log_buffer_off] = 0;
> +            throttle(s, s->log_buffer_off);
> +            DPRINTF("%s\n", s->log_buffer);
> +            s->log_buffer_off = 0;
> +            break;
> +        }
> +        s->log_buffer[s->log_buffer_off++] = val;

^^

> +        break;
> +    }
> +}
> +
> +static uint32_t platform_fixed_ioport_readw(void *opaque, uint32_t addr)
> +{
> +    PCIXenPlatformState *s = opaque;
> +
> +    switch (addr - XEN_PLATFORM_IOPORT) {
> +    case 0:
> +        if (s->drivers_blacklisted) {
> +            /* The drivers will recognise this magic number and refuse
> +             * to do anything. */
> +            return 0xd249;
> +        } else {
> +            /* Magic value so that you can identify the interface. */
> +            return 0x49d2;
> +        }
> +    default:
> +        return 0xffff;
> +    }
> +}
> +
> +static uint32_t platform_fixed_ioport_readb(void *opaque, uint32_t addr)
> +{
> +    PCIXenPlatformState *s = opaque;
> +
> +    switch (addr - XEN_PLATFORM_IOPORT) {
> +    case 0:
> +        /* Platform flags */
> +        return s->flags;
> +    case 2:
> +        /* Version number */
> +        return 1;
> +    default:
> +        return 0xff;
> +    }
> +}
> +
> +static void platform_fixed_ioport_reset(void *opaque)
> +{
> +    PCIXenPlatformState *s = opaque;
> +
> +    platform_fixed_ioport_writeb(s, XEN_PLATFORM_IOPORT, 0);
> +}
> +
> +static void platform_fixed_ioport_init(PCIXenPlatformState* s)
> +{
> +    register_ioport_write(XEN_PLATFORM_IOPORT, 16, 4, 
> platform_fixed_ioport_writel, s);
> +    register_ioport_write(XEN_PLATFORM_IOPORT, 16, 2, 
> platform_fixed_ioport_writew, s);
> +    register_ioport_write(XEN_PLATFORM_IOPORT, 16, 1, 
> platform_fixed_ioport_writeb, s);
> +    register_ioport_read(XEN_PLATFORM_IOPORT, 16, 2, 
> platform_fixed_ioport_readw, s);
> +    register_ioport_read(XEN_PLATFORM_IOPORT, 16, 1, 
> platform_fixed_ioport_readb, s);
> +}
> +
> +/* Xen Platform PCI Device */
> +
> +static uint32_t xen_platform_ioport_readb(void *opaque, uint32_t addr)
> +{
> +    addr &= 0xff;
> +
> +    if (addr == 0) {
> +        return platform_fixed_ioport_readb(opaque, XEN_PLATFORM_IOPORT);
> +    } else {
> +        return ~0u;
> +    }
> +}
> +
> +static void xen_platform_ioport_writeb(void *opaque, uint32_t addr, uint32_t 
> val)
> +{
> +    PCIXenPlatformState *s = opaque;
> +
> +    addr &= 0xff;
> +    val  &= 0xff;
> +
> +    switch (addr) {
> +    case 0: /* Platform flags */
> +        platform_fixed_ioport_writeb(opaque, XEN_PLATFORM_IOPORT, val);
> +        break;
> +    case 8:
> +        {
> +            if (val == '\n' || s->log_buffer_off == sizeof(s->log_buffer) - 
> 1) {
> +                /* Flush buffer */
> +                s->log_buffer[s->log_buffer_off] = 0;
> +                throttle(s, s->log_buffer_off);
> +                DPRINTF("%s\n", s->log_buffer);
> +                s->log_buffer_off = 0;
> +                break;
> +            }
> +            s->log_buffer[s->log_buffer_off++] = val;

Isn't this duplicate code to the log case above? Please combine the two if it 
makes sense :).


Alex


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