Re: [Xen-devel] [PATCH v3 05/16] libxl: Load guest BIOS from file

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, Feb 25, 2016 at 02:56:03PM +0000, Anthony PERARD wrote:
> The path to the BIOS blob can be override by the xl's bios_override option,
> or provided by u.hvm.bios_firmware in the domain_build_info struct by other
> libxl user.
> 
> Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
> 
> ---
> Change in V3:
> - move seabios_path and ovmf_path to libxl_path.c (with renaming)
> - fix some coding style
> - warn for empty file
> - remove rombios stuff (will still be built-in hvmloader)
> - rename field bios_filename in domain_build_info to bios_firmware to
>   follow naming of acpi and smbios.
> - log an error after libxl_read_file_contents() only when it return ENOENT
> - return an error on empty file.
> - added #define LIBXL_HAVE_BUILDINFO_HVM_BIOS_FIRMWARE
> ---
>  tools/libxl/libxl.h          |  8 +++++++
>  tools/libxl/libxl_dom.c      | 57 
> ++++++++++++++++++++++++++++++++++++++++++++
>  tools/libxl/libxl_internal.h |  2 ++
>  tools/libxl/libxl_paths.c    | 10 ++++++++
>  tools/libxl/libxl_types.idl  |  1 +
>  tools/libxl/xl_cmdimpl.c     | 11 ++++++---

You also need to patch manpage for this new option.

How does this new option interacts with bios= option?

>  6 files changed, 86 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
> index fa87f53..d223c35 100644
> --- a/tools/libxl/libxl.h
> +++ b/tools/libxl/libxl.h
> @@ -876,6 +876,14 @@ void libxl_mac_copy(libxl_ctx *ctx, libxl_mac *dst, 
> libxl_mac *src);
>   */
>  #define LIBXL_HAVE_DEVICE_MODEL_VERSION_NONE 1
>  
> +/*
> + * LIBXL_HAVE_BUILDINFO_HVM_BIOS_FIRMWARE
> + *
> + * libxl_domain_build_info has u.hvm.bios_firmware field which can be use
> + * to provide a different bios blob (like SeaBIOS or OVMF).
> + */
> +#define LIBXL_HAVE_BUILDINFO_HVM_BIOS_FIRMWARE
> +
>  typedef char **libxl_string_list;
>  void libxl_string_list_dispose(libxl_string_list *sl);
>  int libxl_string_list_length(const libxl_string_list *sl);
> diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
> index 2269998..50abfbc 100644
> --- a/tools/libxl/libxl_dom.c
> +++ b/tools/libxl/libxl_dom.c
> @@ -863,6 +863,38 @@ err:
>      return ret;
>  }
>  
> +static int libxl__load_hvm_firmware_module(libxl__gc *gc,
> +                                           const char *filename,
> +                                           const char *what,
> +                                           struct xc_hvm_firmware_module *m)
> +{
> +    int datalen = 0;
> +    void *data = NULL;
> +    int e;
> +
> +    LOG(DEBUG, "Loading %s: %s", what, filename);
> +    e = libxl_read_file_contents(CTX, filename, &data, &datalen);
> +    if (e) {
> +        /*
> +         * Print a message only on ENOENT, other error are logged by the
> +         * function libxl_read_file_contents().
> +         */
> +        if (e == ENOENT)
> +            LOGEV(ERROR, e, "failed to read %s file", what);
> +        return ERROR_FAIL;
> +    }
> +    libxl__ptr_add(gc, data);
> +    if (datalen) {
> +        /* Only accept non-empty files */
> +        m->data = data;
> +        m->length = datalen;
> +    } else {
> +        LOG(ERROR, "file %s for %s is empty", filename, what);
> +        return ERROR_FAIL;

ERROR_INVAL is more appropriate.


Wei.

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