[Xen-changelog] [xen stable-4.5] efi: introduce efi_arch_flush_dcache_area

[patchbot@xxxxxxx]

commit bfa874d7ce12e2903a050ed8173687f75cae789e
Author:     Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
AuthorDate: Wed Sep 23 09:06:00 2015 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Sep 23 09:06:00 2015 +0200

    efi: introduce efi_arch_flush_dcache_area
    
    Objects loaded by FileHandle->Read need to be flushed from dcache,
    otherwise copy_from_paddr will read stale data when copying the kernel,
    causing a failure to boot.
    
    Introduce efi_arch_flush_dcache_area and call it from read_file.
    
    This commit introduces no functional changes on x86.
    
    Reported-by: Mark Rutland <mark.rutland@xxxxxxx>
    Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    master commit: 0d6a3c755374f04f6dd25373da28291a8f35bede
    master date: 2015-09-09 15:29:06 +0200
---
 xen/arch/arm/efi/efi-boot.h |    7 +++++++
 xen/arch/x86/efi/efi-boot.h |    2 ++
 xen/common/efi/boot.c       |    2 ++
 3 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/xen/arch/arm/efi/efi-boot.h b/xen/arch/arm/efi/efi-boot.h
index cf9c3c6..7a84fa8 100644
--- a/xen/arch/arm/efi/efi-boot.h
+++ b/xen/arch/arm/efi/efi-boot.h
@@ -9,6 +9,7 @@
 #include <asm/smp.h>
 
 void noreturn efi_xen_start(void *fdt_ptr, uint32_t fdt_size);
+void __flush_dcache_area(const void *vaddr, unsigned long size);
 
 #define DEVICE_TREE_GUID \
 {0xb1b621d5, 0xf19c, 0x41a5, {0x83, 0x0b, 0xd9, 0x15, 0x2c, 0x69, 0xaa, 0xe0}}
@@ -570,6 +571,12 @@ static void __init 
efi_arch_video_init(EFI_GRAPHICS_OUTPUT_PROTOCOL *gop,
                                        EFI_GRAPHICS_OUTPUT_MODE_INFORMATION 
*mode_info)
 {
 }
+
+static void efi_arch_flush_dcache_area(const void *vaddr, UINTN size)
+{
+    __flush_dcache_area(vaddr, size);
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/arch/x86/efi/efi-boot.h b/xen/arch/x86/efi/efi-boot.h
index 2dd69f6..4c7f383 100644
--- a/xen/arch/x86/efi/efi-boot.h
+++ b/xen/arch/x86/efi/efi-boot.h
@@ -640,6 +640,8 @@ static bool_t __init 
efi_arch_use_config_file(EFI_SYSTEM_TABLE *SystemTable)
     return 1; /* x86 always uses a config file */
 }
 
+static void efi_arch_flush_dcache_area(const void *vaddr, UINTN size) { }
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c
index 532ed8c..2a3cd78 100644
--- a/xen/common/efi/boot.c
+++ b/xen/common/efi/boot.c
@@ -526,6 +526,8 @@ static bool_t __init read_file(EFI_FILE_HANDLE dir_handle, 
CHAR16 *name,
         PrintErrMesg(name, ret);
     }
 
+    efi_arch_flush_dcache_area(file->ptr, file->size);
+
     return 1;
 }
 
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.5

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