[tip:x86/trampoline] x86, realmode: Mask out EFER. LMA when saving trampoline EFER

["tip-bot for H. Peter Anvin" <hpa@linux.intel.com>]

Commit-ID:  796038799a72adb279d785c9154df6eeb98b6e8d
Gitweb:     http://git.kernel.org/tip/796038799a72adb279d785c9154df6eeb98b6e8d
Author:     H. Peter Anvin <hpa@linux.intel.com>
AuthorDate: Wed, 16 May 2012 13:22:41 -0700
Committer:  H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Wed, 16 May 2012 13:22:41 -0700

x86, realmode: Mask out EFER.LMA when saving trampoline EFER

Some AMD processors apparently #GP(0) if EFER.LMA is set in WRMSR,
rather than ignoring it.  Thus, we need to mask it out.

Reported-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Borislav Petkov <bp@alien8.de>
Cc: Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1336501366-28617-24-git-send-email-jarkko.sakkinen@intel.com
---
 arch/x86/kernel/realmode.c |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/realmode.c b/arch/x86/kernel/realmode.c
index 66ac276..0992779 100644
--- a/arch/x86/kernel/realmode.c
+++ b/arch/x86/kernel/realmode.c
@@ -22,6 +22,7 @@ void __init setup_real_mode(void)
 	size_t size = PAGE_ALIGN(real_mode_blob_end - real_mode_blob);
 #ifdef CONFIG_X86_64
 	u64 *trampoline_pgd;
+	u32 efer_low, efer_high;
 #endif
 
 	/* Has to be in very low memory so we can execute real-mode AP code. */
@@ -65,9 +66,13 @@ void __init setup_real_mode(void)
 	trampoline_header->gdt_limit = __BOOT_DS + 7;
 	trampoline_header->gdt_base = __pa(boot_gdt);
 #else
-	if (rdmsr_safe(MSR_EFER, &trampoline_header->efer_low,
-		       &trampoline_header->efer_high))
-		BUG();
+	/*
+	 * Some AMD processors will #GP(0) if EFER.LMA is set in WRMSR
+	 * so we need to mask it out.
+	 */
+	rdmsr(MSR_EFER, efer_low, efer_high);
+	trampoline_header->efer_low  = efer_low & ~EFER_LMA;
+	trampoline_header->efer_high = efer_high;
 
 	trampoline_header->start = (u64) secondary_startup_64;
 	trampoline_cr4_features = &trampoline_header->cr4;