On 05/14/19 at 01:09pm, Kairui Song wrote:
> Since kernel commit e6e094e053af75 ("x86/acpi, x86/boot: Take RSDP address
> from boot params if available"), kernel accept an acpi_rsdp_addr param in
> boot_params. So fill in this parameter unconditionally, ensure second
> kernel always get the right RSDP address consistently, and boot well on
> EFI system even with EFI service disabled. User no longer need to change
> the kernel cmdline to workaround the missing RSDP issue.
>
> For older version of kernels (Before 5.0), there won't be any change of
> behavior.
>
> Signed-off-by: Kairui Song <kasong@xxxxxxxxxx>
> ---
> kexec/arch/i386/x86-linux-setup.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/kexec/arch/i386/x86-linux-setup.c b/kexec/arch/i386/x86-linux-setup.c
> index 5ca7c25..5b00b42 100644
> --- a/kexec/arch/i386/x86-linux-setup.c
> +++ b/kexec/arch/i386/x86-linux-setup.c
> @@ -901,4 +901,7 @@ void setup_linux_system_parameters(struct kexec_info *info,
>
> /* fill the EDD information */
> setup_edd_info(real_mode);
> +
> + /* Always try to fill acpi_rsdp_addr */
> + real_mode->acpi_rsdp_addr = get_acpi_rsdp();
> }
> --
> 2.20.1
>
>
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Seems no better way to check old kernel, then go with this way looks
acceptable.
Thanks
Dave
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