diff options
| author | Juergen Gross <jgross@suse.com> | 2024-08-09 17:52:55 +0200 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2024-09-12 08:25:07 +0200 |
| commit | 9221222c717dbddac1e3c49906525475d87a3a44 (patch) | |
| tree | 49deae4e5328a34175841b3b31e42ab146737ba0 /arch/x86/include/asm | |
| parent | d05208cf7f05420ad10cc7f9550f91d485523659 (diff) | |
xen: allow mapping ACPI data using a different physical address
When running as a Xen PV dom0 the system needs to map ACPI data of the
host using host physical addresses, while those addresses can conflict
with the guest physical addresses of the loaded linux kernel. The same
problem might apply in case a PV guest is configured to use the host
memory map.
This conflict can be solved by mapping the ACPI data to a different
guest physical address, but mapping the data via acpi_os_ioremap()
must still be possible using the host physical address, as this
address might be generated by AML when referencing some of the ACPI
data.
When configured to support running as a Xen PV domain, have an
implementation of acpi_os_ioremap() being aware of the possibility to
need above mentioned translation of a host physical address to the
guest physical address.
This modification requires to #include linux/acpi.h in some sources
which need to include asm/acpi.h directly.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/acpi.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h index 21bc53f5ed0c..5ab1a4598d00 100644 --- a/arch/x86/include/asm/acpi.h +++ b/arch/x86/include/asm/acpi.h @@ -174,6 +174,14 @@ void acpi_generic_reduced_hw_init(void); void x86_default_set_root_pointer(u64 addr); u64 x86_default_get_root_pointer(void); +#ifdef CONFIG_XEN_PV +/* A Xen PV domain needs a special acpi_os_ioremap() handling. */ +extern void __iomem * (*acpi_os_ioremap)(acpi_physical_address phys, + acpi_size size); +void __iomem *x86_acpi_os_ioremap(acpi_physical_address phys, acpi_size size); +#define acpi_os_ioremap acpi_os_ioremap +#endif + #else /* !CONFIG_ACPI */ #define acpi_lapic 0 |