linux-kernel - [PATCH 3.14 23/29] x86/efi: Use all 64 bit of efi_memmap in setup

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Date:	Sat,  8 Aug 2015 15:07:46 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Dmitry Skorodumov <sdmitry@...allels.com>,
	"Denis V. Lunev" <den@...nvz.org>,
	Matt Fleming <matt.fleming@...el.com>
Subject: [PATCH 3.14 23/29] x86/efi: Use all 64 bit of efi_memmap in setup_e820()

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dmitry Skorodumov <sdmitry@...allels.com>

commit 7cc03e48965453b5df1cce5062c826189b04b960 upstream.

The efi_info structure stores low 32 bits of memory map
in efi_memmap and high 32 bits in efi_memmap_hi.

While constructing pointer in the setup_e820(), need
to take into account all 64 bit of the pointer.

It is because on 64bit machine the function
efi_get_memory_map() may return full 64bit pointer and before
the patch that pointer was truncated.

The issue is triggered on Parallles virtual machine and
fixed with this patch.

Signed-off-by: Dmitry Skorodumov <sdmitry@...allels.com>
Cc: Denis V. Lunev <den@...nvz.org>
Signed-off-by: Matt Fleming <matt.fleming@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/boot/compressed/eboot.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -560,6 +560,10 @@ static efi_status_t setup_e820(struct bo
 		unsigned int e820_type = 0;
 		unsigned long m = efi->efi_memmap;

+#ifdef CONFIG_X86_64
+		m |= (u64)efi->efi_memmap_hi << 32;
+#endif
+
 		d = (efi_memory_desc_t *)(m + (i * efi->efi_memdesc_size));
 		switch (d->type) {
 		case EFI_RESERVED_TYPE:

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