x86/platform/UV: Fix support for EFI_OLD_MEMMAP after BIOS callback updates

Some time ago, we brought our UV BIOS callback code up to speed with the
new EFI memory mapping scheme, in commit:

    d1be84a232e3 ("x86/uv: Update uv_bios_call() to use efi_call_virt_pointer()")

By leveraging some changes that I made to a few of the EFI runtime
callback mechanisms, in commit:

    80e75596079f ("efi: Convert efi_call_virt() to efi_call_virt_pointer()")

This got everything running smoothly on UV, with the new EFI mapping
code.  However, this left one, small loose end, in that EFI_OLD_MEMMAP
(a.k.a. efi=old_map) will no longer work on UV, on kernels that include
the aforementioned changes.

At the time this was not a major issue (in fact, it still really isn't),
but there's no reason that EFI_OLD_MEMMAP *shouldn't* work on our
systems.  This commit adds a check into uv_bios_call(), to see if we have
the EFI_OLD_MEMMAP bit set in efi.flags.  If it is set, we fall back to
using our old callback method, which uses efi_call() directly on the __va()
of our function pointer.

Signed-off-by: Alex Thorlton <[email protected]>
Acked-by: Matt Fleming <[email protected]>
Cc: <[email protected]> # v4.7 and later
Cc: Andy Lutomirski <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Denys Vlasenko <[email protected]>
Cc: Dimitri Sivanich <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Mike Travis <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Russ Anderson <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

diff --git a/arch/x86/platform/uv/bios_uv.c b/arch/x86/platform/uv/bios_uv.c
index b4d5e95fe4dfea57c3d9bdcdfa2d35d46a48bc5d..4a6a5a26c58295e4245b09be21a658c3ddae86a2 100644 (file)
--- a/arch/x86/platform/uv/bios_uv.c
+++ b/arch/x86/platform/uv/bios_uv.c
@@ -40,7 +40,15 @@ s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
                 */
                return BIOS_STATUS_UNIMPLEMENTED;
 
-       ret = efi_call_virt_pointer(tab, function, (u64)which, a1, a2, a3, a4, a5);
+       /*
+        * If EFI_OLD_MEMMAP is set, we need to fall back to using our old EFI
+        * callback method, which uses efi_call() directly, with the kernel page tables:
+        */
+       if (unlikely(test_bit(EFI_OLD_MEMMAP, &efi.flags)))
+               ret = efi_call((void *)__va(tab->function), (u64)which, a1, a2, a3, a4, a5);
+       else
+               ret = efi_call_virt_pointer(tab, function, (u64)which, a1, a2, a3, a4, a5);
+
        return ret;
 }
 EXPORT_SYMBOL_GPL(uv_bios_call);