Messages in this thread Patch in this message | | | Date | Wed, 31 Jan 2018 01:13:40 -0800 | From | "tip-bot for Kirill A. Shutemov" <> | Subject | [tip:x86/urgent] x86/kexec: Make kexec (mostly) work in 5-level paging mode |
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Commit-ID: 5bf30316991d5bcda046343ee77d823cf16fdd03 Gitweb: https://git.kernel.org/tip/5bf30316991d5bcda046343ee77d823cf16fdd03 Author: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> AuthorDate: Mon, 29 Jan 2018 14:08:45 +0300 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Wed, 31 Jan 2018 08:39:40 +0100
x86/kexec: Make kexec (mostly) work in 5-level paging mode
Currently kexec() will crash when switching into a 5-level paging enabled kernel.
I missed that we need to change relocate_kernel() to set CR4.LA57 flag if the kernel has 5-level paging enabled.
I avoided using #ifdef CONFIG_X86_5LEVEL here and inferred if we need to enable 5-level paging from previous CR4 value. This way the code is ready for boot-time switching between paging modes.
With this patch applied, in addition to kexec 4-to-4 which always worked, we can kexec 4-to-5 and 5-to-5 - while 5-to-4 will need more work.
Reported-by: Baoquan He <bhe@redhat.com> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Tested-by: Baoquan He <bhe@redhat.com> Cc: <stable@vger.kernel.org> # v4.14+ Cc: Borislav Petkov <bp@suse.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-mm@kvack.org Fixes: 77ef56e4f0fb ("x86: Enable 5-level paging support via CONFIG_X86_5LEVEL=y") Link: http://lkml.kernel.org/r/20180129110845.26633-1-kirill.shutemov@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org> --- arch/x86/kernel/relocate_kernel_64.S | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S index 307d3ba..11eda21e 100644 --- a/arch/x86/kernel/relocate_kernel_64.S +++ b/arch/x86/kernel/relocate_kernel_64.S @@ -68,6 +68,9 @@ relocate_kernel: movq %cr4, %rax movq %rax, CR4(%r11) + /* Save CR4. Required to enable the right paging mode later. */ + movq %rax, %r13 + /* zero out flags, and disable interrupts */ pushq $0 popfq @@ -126,8 +129,13 @@ identity_mapped: /* * Set cr4 to a known state: * - physical address extension enabled + * - 5-level paging, if it was enabled before */ movl $X86_CR4_PAE, %eax + testq $X86_CR4_LA57, %r13 + jz 1f + orl $X86_CR4_LA57, %eax +1: movq %rax, %cr4 jmp 1f
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