4.14-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Gleixner tglx@linutronix.de
commit 2f7412ba9c6af5ab16bdbb4a3fdb1dcd2b4fd3c2 upstream.
The (irq)entry text must be visible in the user space page tables. To allow simple PMD based sharing, make the entry text PMD aligned.
Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: Andy Lutomirski luto@kernel.org Cc: Boris Ostrovsky boris.ostrovsky@oracle.com Cc: Borislav Petkov bp@alien8.de Cc: Brian Gerst brgerst@gmail.com Cc: Dave Hansen dave.hansen@linux.intel.com Cc: David Laight David.Laight@aculab.com Cc: Denys Vlasenko dvlasenk@redhat.com Cc: Eduardo Valentin eduval@amazon.com Cc: Greg KH gregkh@linuxfoundation.org Cc: H. Peter Anvin hpa@zytor.com Cc: Josh Poimboeuf jpoimboe@redhat.com Cc: Juergen Gross jgross@suse.com Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Peter Zijlstra peterz@infradead.org Cc: Will Deacon will.deacon@arm.com Cc: aliguori@amazon.com Cc: daniel.gruss@iaik.tugraz.at Cc: hughd@google.com Cc: keescook@google.com Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/kernel/vmlinux.lds.S | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -61,11 +61,17 @@ jiffies_64 = jiffies; . = ALIGN(HPAGE_SIZE); \ __end_rodata_hpage_align = .;
+#define ALIGN_ENTRY_TEXT_BEGIN . = ALIGN(PMD_SIZE); +#define ALIGN_ENTRY_TEXT_END . = ALIGN(PMD_SIZE); + #else
#define X64_ALIGN_RODATA_BEGIN #define X64_ALIGN_RODATA_END
+#define ALIGN_ENTRY_TEXT_BEGIN +#define ALIGN_ENTRY_TEXT_END + #endif
PHDRS { @@ -102,8 +108,10 @@ SECTIONS CPUIDLE_TEXT LOCK_TEXT KPROBES_TEXT + ALIGN_ENTRY_TEXT_BEGIN ENTRY_TEXT IRQENTRY_TEXT + ALIGN_ENTRY_TEXT_END SOFTIRQENTRY_TEXT *(.fixup) *(.gnu.warning)