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author | Ingo Molnar <mingo@kernel.org> | 2019-02-04 08:45:42 +0100 |
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committer | Ingo Molnar <mingo@kernel.org> | 2019-02-04 08:45:42 +0100 |
commit | 98cb621081705e2244ef6c265ff8a9f2208c7e2a (patch) | |
tree | 6205be47a83d54d3e35e049b67973244120f8bd6 /arch/x86/boot/compressed/head_64.S | |
parent | b844ff366f06a2bcecfbd053b4d4a472e670dec8 (diff) | |
parent | 9dff0aa95a324e262ffb03f425d00e4751f3294e (diff) | |
download | linux-98cb621081705e2244ef6c265ff8a9f2208c7e2a.tar.gz linux-98cb621081705e2244ef6c265ff8a9f2208c7e2a.tar.bz2 linux-98cb621081705e2244ef6c265ff8a9f2208c7e2a.zip |
Merge branch 'perf/urgent' into perf/core, to pick up fixes
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/boot/compressed/head_64.S')
-rw-r--r-- | arch/x86/boot/compressed/head_64.S | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index 64037895b085..f105ae8651c9 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -600,6 +600,14 @@ ENTRY(trampoline_32bit_src) leal TRAMPOLINE_32BIT_PGTABLE_OFFSET(%ecx), %eax movl %eax, %cr3 3: + /* Set EFER.LME=1 as a precaution in case hypervsior pulls the rug */ + pushl %ecx + movl $MSR_EFER, %ecx + rdmsr + btsl $_EFER_LME, %eax + wrmsr + popl %ecx + /* Enable PAE and LA57 (if required) paging modes */ movl $X86_CR4_PAE, %eax cmpl $0, %edx |