x86/efi: Setup separate EFI page tables in kexec paths

The switch to using a new dedicated page table for EFI runtime
calls in commit commit 67a9108ed431 ("x86/efi: Build our own
page table structures") failed to take into account changes
required for the kexec code paths, which are unfortunately
duplicated in the EFI code.

Call the allocation and setup functions in
kexec_enter_virtual_mode() just like we do for
__efi_enter_virtual_mode() to avoid hitting NULL-pointer
dereferences when making EFI runtime calls.

At the very least, the call to efi_setup_page_tables() should
have existed for kexec before the following commit:

  67a9108ed431 ("x86/efi: Build our own page table structures")

Things just magically worked because we were actually using
the kernel's page tables that contained the required mappings.

Reported-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Tested-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1453385519-11477-1-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 3c1f3cd7b2ba036de80bc2ce7054aafe67d5e7ea..bdd9477f937c9af59cea61aa8f5f38a2c8baafc8 100644 (file)
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -815,6 +815,7 @@ static void __init kexec_enter_virtual_mode(void)
 {
 #ifdef CONFIG_KEXEC_CORE
        efi_memory_desc_t *md;
+       unsigned int num_pages;
        void *p;
 
        efi.systab = NULL;
@@ -829,6 +830,12 @@ static void __init kexec_enter_virtual_mode(void)
                return;
        }
 
+       if (efi_alloc_page_tables()) {
+               pr_err("Failed to allocate EFI page tables\n");
+               clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
+               return;
+       }
+
        /*
        * Map efi regions which were passed via setup_data. The virt_addr is a
        * fixed addr which was used in first kernel of a kexec boot.
@@ -843,6 +850,14 @@ static void __init kexec_enter_virtual_mode(void)
 
        BUG_ON(!efi.systab);
 
+       num_pages = ALIGN(memmap.nr_map * memmap.desc_size, PAGE_SIZE);
+       num_pages >>= PAGE_SHIFT;
+
+       if (efi_setup_page_tables(memmap.phys_map, num_pages)) {
+               clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
+               return;
+       }
+
        efi_sync_low_kernel_mappings();
 
        /*