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SubjectRe: [PATCH 0/3] x86: make rsdp address accessible via boot params
On Tue, Nov 28, 2017 at 10:43 AM, Juergen Gross <jgross@suse.com> wrote:
> In the non-EFI boot path the ACPI RSDP table is currently found via
> either EBDA or by searching through low memory for the RSDP magic.
> This requires the RSDP to be located in the first 1MB of physical
> memory. Xen PVH guests, however, get the RSDP address via the start of
> day information block.
>
> In order to support an arbitrary RSDP address this patch series adds
> the physical address of the RSDP to the boot params structure filled
> by the boot loader. A kernel booted directly in PVH mode can save the
> RSDP address in the boot params, while a kernel booted in PVH mode via
> grub can rely on the RSDP address being specified by grub2 (which in
> turn got the address via the start of day information block from Xen).
>
> Juergen Gross (3):
> x86/boot: add acpi rsdp address to setup_header
> x86/acpi: take rsdp address for boot params if available
> x86/xen: supply rsdp address in boot params for pvh guests
>
> Documentation/x86/boot.txt | 19 +++++++++++++++++++
> arch/x86/boot/header.S | 6 +++++-
> arch/x86/include/uapi/asm/bootparam.h | 1 +
> arch/x86/xen/enlighten_pvh.c | 2 ++
> drivers/acpi/osl.c | 8 ++++++++
> 5 files changed, 35 insertions(+), 1 deletion(-)
>
> --

Is this going to work with all existing setups?

Thanks,
Rafael

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