Re: [Xen-devel] [PATCH 2/3] x86/acpi: take rsdp address for boot params if available

[Roger Pau Monné]

On Tue, Nov 28, 2017 at 10:43:59AM +0100, Juergen Gross wrote:
> In case the rsdp address in struct boot_params is specified don't try
> to find the table by searching, but take the address directly as set
> by the boot loader.
> 
> Signed-off-by: Juergen Gross 
> ---
>  drivers/acpi/osl.c | 8 
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index 3bb46cb24a99..3b25e2ad7d75 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -45,6 +45,10 @@
>  #include 
>  #include 
>  
> +#ifdef CONFIG_X86
> +#include 
> +#endif
> +
>  #include "internal.h"
>  
>  #define _COMPONENT   ACPI_OS_SERVICES
> @@ -195,6 +199,10 @@ acpi_physical_address __init 
> acpi_os_get_root_pointer(void)
>   if (acpi_rsdp)
>   return acpi_rsdp;
>  #endif
> +#ifdef CONFIG_X86
> + if (boot_params.hdr.acpi_rsdp_addr)
> + return boot_params.hdr.acpi_rsdp_addr;
> +#endif

I'm struggling to figure out how was PVH getting the RSDP previously,
because that should be removed now that it's in the zero-page.

Roger.

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[Xen-devel] [PATCH 2/3] x86/acpi: take rsdp address for boot params if available

[Juergen Gross]

In case the rsdp address in struct boot_params is specified don't try
to find the table by searching, but take the address directly as set
by the boot loader.

Signed-off-by: Juergen Gross 
---
 drivers/acpi/osl.c | 8 
 1 file changed, 8 insertions(+)

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 3bb46cb24a99..3b25e2ad7d75 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -45,6 +45,10 @@
 #include 
 #include 
 
+#ifdef CONFIG_X86
+#include 
+#endif
+
 #include "internal.h"
 
 #define _COMPONENT ACPI_OS_SERVICES
@@ -195,6 +199,10 @@ acpi_physical_address __init acpi_os_get_root_pointer(void)
if (acpi_rsdp)
return acpi_rsdp;
 #endif
+#ifdef CONFIG_X86
+   if (boot_params.hdr.acpi_rsdp_addr)
+   return boot_params.hdr.acpi_rsdp_addr;
+#endif
 
if (efi_enabled(EFI_CONFIG_TABLES)) {
if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
-- 
2.12.3


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