Re: [Qemu-devel] [PATCH 33/40] xenner: core

[malc <av1474@comtv.ru>]

On Mon, 1 Nov 2010, Alexander Graf wrote:

> This patch adds generic xenner functionality to qemu.
> 
> Signed-off-by: Alexander Graf <agraf@suse.de>
> ---
>  hw/xenner.h      |   52 +++++++++++++
>  hw/xenner_core.c |  224 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 276 insertions(+), 0 deletions(-)
>  create mode 100644 hw/xenner.h
>  create mode 100644 hw/xenner_core.c
> 
> diff --git a/hw/xenner.h b/hw/xenner.h
> new file mode 100644
> index 0000000..241dc4c
> --- /dev/null
> +++ b/hw/xenner.h
> @@ -0,0 +1,52 @@
> +/*
> + *  Copyright (C) Red Hat 2007
> + *  Copyright (C) Novell Inc. 2010
> + *
> + *  Author(s): Gerd Hoffmann <kraxel@redhat.com>
> + *             Alexander Graf <agraf@suse.de>
> + *
> + *  This program is free software; you can redistribute it and/or modify
> + *  it under the terms of the GNU General Public License as published by
> + *  the Free Software Foundation; under version 2 of the License.
> + *
> + *  This program is distributed in the hope that it will be useful,
> + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
> + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + *  GNU General Public License for more details.
> + *
> + *  You should have received a copy of the GNU General Public License along
> + *  with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include "qemu-common.h"
> +
> +/* xenner_core.c */
> +struct xenner_emu_file {
> +    const char *filename;
> +    int        pages;
> +    void       *blob;
> +};
> +
> +void *xenner_mfn_to_ptr(xen_pfn_t pfn);
> +void *xenner_get_grant_table(int index);
> +void *xenner_get_vminfo(void);
> +uint64_t xenner_get_config(uint32_t reg);
> +uint32_t xenner_get_evtchn_pin(uint32_t reg);
> +void xenner_set_config(uint32_t reg, uint64_t value);
> +int xenner_load_emu_file(struct xenner_emu_file *f);
> +int xenner_guest_evtchn_alloc(void);
> +int xenner_guest_evtchn_release(int port);
> +int xenner_core_init(int evt);
> +
> +/* xenner_guest_store.c */
> +void xenner_guest_store_setup(uint64_t guest_mfn, evtchn_port_t guest_evtchn);
> +void xenner_guest_store_reset(void);
> +
> +/* xenner_pv.c */
> +int xenner_init_pv(const char *kernel_filename,
> +                   const char *kernel_cmdline,
> +                   const char *initrd_filename);
> +
> +int xenner_domain_build_pv(const char *kernel,
> +                           const char *initrd,
> +                           const char *cmdline);
> diff --git a/hw/xenner_core.c b/hw/xenner_core.c
> new file mode 100644
> index 0000000..53a9a75
> --- /dev/null
> +++ b/hw/xenner_core.c
> @@ -0,0 +1,224 @@
> +/*
> + *  Copyright (C) Red Hat 2007
> + *  Copyright (C) Novell Inc. 2010
> + *
> + *  Author(s): Gerd Hoffmann <kraxel@redhat.com>
> + *             Alexander Graf <agraf@suse.de>
> + *
> + *  Xenner Core
> + *
> + *  This program is free software; you can redistribute it and/or modify
> + *  it under the terms of the GNU General Public License as published by
> + *  the Free Software Foundation; under version 2 of the License.
> + *
> + *  This program is distributed in the hope that it will be useful,
> + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
> + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + *  GNU General Public License for more details.
> + *
> + *  You should have received a copy of the GNU General Public License along
> + *  with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include "hw.h"
> +#include "isa.h"
> +#include "sysemu.h"
> +#include "xen.h"
> +#include "xen_interfaces.h"
> +#include "xenner.h"
> +#include "xenner_emudev.h"
> +#include "loader.h"
> +
> +/* #define DEBUG */
> +
> +static int guest_evtchndev;
> +static struct emudev_state xen_emudev;
> +
> +/* ------------------------------------------------------------- */
> +
> +static void do_emudev_command(uint16_t cmd, uint16_t arg)
> +{
> +    switch (cmd) {
> +    case EMUDEV_CMD_NOP:
> +        /* nop vmexit */
> +        break;
> +    case EMUDEV_CMD_WRITE_CHAR:
> +#ifdef DEBUG
> +        fprintf(stderr, "%c", arg);
> +#endif
> +        break;
> +    case EMUDEV_CMD_CONFIGURATION_DONE:
> +        /* emu finisted initial EMUDEV_CONF_* setup */
> +        break;
> +    case EMUDEV_CMD_EVTCHN_ALLOC:
> +        if (arg < EMUDEV_CONF_COMMAND_RESULT_COUNT) {
> +            xen_emudev.result[arg] = xenner_guest_evtchn_alloc();
> +        }
> +        break;
> +    case EMUDEV_CMD_EVTCHN_SEND:
> +        xc_evtchn.notify(guest_evtchndev, arg);
> +        break;
> +    case EMUDEV_CMD_GUEST_SHUTDOWN:
> +        switch (arg) {
> +        case SHUTDOWN_poweroff:
> +            fprintf(stderr, "xenner emudev: guest poweroff -> powerdown\n");
> +            qemu_system_powerdown_request();
> +            break;
> +        case SHUTDOWN_reboot:
> +            fprintf(stderr, "xenner emudev: guest reboot -> reset\n");
> +            qemu_system_reset_request();
> +            vm_stop(0);
> +            break;
> +        case SHUTDOWN_suspend:
> +            fprintf(stderr, "xenner emudev: guest suspend -> stop vm\n");
> +            vm_stop(0);
> +            break;
> +        case SHUTDOWN_crash:
> +            fprintf(stderr, "xenner emudev: guest crash -> reset\n");
> +            vm_stop(0);
> +            qemu_system_reset_request();
> +            break;
> +        }
> +        break;
> +    default:
> +        fprintf(stderr, "xenner emudev: cmd 0x%04x arg 0x%04x\n", cmd, arg);
> +    }
> +}
> +
> +static void xenner_port_write(void *opaque, uint32_t addr, uint32_t val)
> +{
> +    uint16_t cmd, arg;
> +
> +    switch (addr) {
> +    case EMUDEV_REG_CONF_ENTRY:
> +        emudev_write_entry(&xen_emudev, val);
> +        break;
> +    case EMUDEV_REG_CONF_VALUE:
> +        emudev_write_value(&xen_emudev, val);
> +        break;
> +    case EMUDEV_REG_COMMAND:
> +        cmd = val >> 16;
> +        arg = val & 0xffff;
> +        do_emudev_command(cmd, arg);
> +        break;
> +    default:
> +        fprintf(stderr, "io: %s, addr 0x%" PRIx16 " value 0x%" PRIx32 "\n",
> +                __FUNCTION__, addr, val);
> +        break;
> +    }
> +}
> +
> +static uint32_t xenner_port_read(void *opaque, uint32_t addr)
> +{
> +    uint32_t val;
> +
> +    switch (addr) {
> +    case EMUDEV_REG_CONF_VALUE:
> +        val = emudev_read_value(&xen_emudev);
> +        break;
> +    default:
> +        fprintf(stderr, "io: %s, addr 0x%" PRIx16 "\n", __FUNCTION__, addr);
> +        val = 0xffffffff;
> +        break;
> +    }
> +    return val;
> +}
> +
> +/* ------------------------------------------------------------- */
> +
> +void *xenner_mfn_to_ptr(xen_pfn_t pfn)
> +{
> +    ram_addr_t offset;
> +
> +    offset = cpu_get_physical_page_desc(pfn << PAGE_SHIFT);
> +    return qemu_get_ram_ptr(offset);
> +}
> +
> +void *xenner_get_grant_table(int index)
> +{
> +    uint32_t pfn;
> +
> +    if (index > EMUDEV_CONF_GRANT_TABLE_COUNT) {
> +        return NULL;
> +    }
> +    pfn = xen_emudev.gnttab[index];
> +    if (!pfn) {
> +        return NULL;
> +    }
> +    return xenner_mfn_to_ptr(pfn);
> +}
> +
> +void *xenner_get_vminfo(void)
> +{
> +    uint32_t pfn;
> +
> +    pfn = xen_emudev.config[EMUDEV_CONF_VMINFO_PFN];
> +    if (!pfn) {
> +        return NULL;
> +    }
> +    return xenner_mfn_to_ptr(pfn);
> +}
> +
> +uint64_t xenner_get_config(uint32_t reg)
> +{
> +    return xen_emudev.config[reg];
> +}
> +
> +uint32_t xenner_get_evtchn_pin(uint32_t reg)
> +{
> +    return xen_emudev.evtchn[reg];
> +}
> +
> +void xenner_set_config(uint32_t reg, uint64_t value)
> +{
> +    xen_emudev.config[reg] = value;
> +}
> +
> +/* ------------------------------------------------------------- */
> +
> +int xenner_load_emu_file(struct xenner_emu_file *f)
> +{
> +    int r;
> +
> +    /* Fetch size */
> +    r = get_image_size(f->filename);
> +    if (r <= 0) {
> +        fprintf(stderr, "can't find %s\n", f->filename);
> +        return -1;
> +    }
> +
> +    /* Allocate memory */
> +    f->pages = (r + PAGE_SIZE - 1) / PAGE_SIZE;
> +    f->blob = qemu_mallocz(f->pages * PAGE_SIZE);
> +    if (!f->blob) {
> +        return -1;
> +    }

qemu_mallocz doesn't return NULL

> +
> +    /* Load image */
> +    r = load_image(f->filename, f->blob);
> +
> +    return r;
> +}
> +
> +/* ------------------------------------------------------------- */
> +
> +int xenner_guest_evtchn_alloc(void)
> +{
> +    return xc_evtchn.bind_unbound_port(guest_evtchndev, 0);
> +}
> +
> +int xenner_guest_evtchn_release(int port)
> +{
> +    return xc_evtchn.unbind(guest_evtchndev, port);
> +}
> +
> +int xenner_core_init(int evt)
> +{
> +    guest_evtchndev = evt;
> +    xc_evtchn.domid(guest_evtchndev, xen_domid);
> +
> +    register_ioport_write(EMUDEV_REG_BASE, 16, 4, xenner_port_write, NULL);
> +    register_ioport_read(EMUDEV_REG_BASE, 16, 4, xenner_port_read, NULL);
> +
> +    return 0;
> +}
> 

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