x86/boot: Synchronize trampoline_cr4_features and mmu_cr4_features directly

The initialization process for trampoline_cr4_features and
mmu_cr4_features was confusing.  The intent is for mmu_cr4_features
and *trampoline_cr4_features to stay in sync, but
trampoline_cr4_features is NULL until setup_real_mode() runs.  The
old code synchronized *trampoline_cr4_features *twice*, once in
setup_real_mode() and once in setup_arch().  It also initialized
mmu_cr4_features in setup_real_mode(), which causes the actual value
of mmu_cr4_features to potentially depend on when setup_real_mode()
is called.

With this patch, mmu_cr4_features is initialized directly in
setup_arch(), and *trampoline_cr4_features is synchronized to
mmu_cr4_features when the trampoline is set up.

After this patch, it should be safe to defer setup_real_mode().

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mario Limonciello <mario_limonciello@dell.com>
Cc: Matt Fleming <mfleming@suse.de>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/d48a263f9912389b957dd495a7127b009259ffe0.1470821230.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index bf780e0..95c8c9c 100644 (file)
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1131,6 +1131,16 @@ void __init setup_arch(char **cmdline_p)
 
        early_trap_pf_init();
 
+       /*
+        * Update mmu_cr4_features (and, indirectly, trampoline_cr4_features)
+        * with the current CR4 value.  This may not be necessary, but
+        * auditing all the early-boot CR4 manipulation would be needed to
+        * rule it out.
+        */
+       if (boot_cpu_data.cpuid_level >= 0)
+               /* A CPU has %cr4 if and only if it has CPUID. */
+               mmu_cr4_features = __read_cr4();
+
        setup_real_mode();
 
        memblock_set_current_limit(get_max_mapped());
@@ -1180,13 +1190,6 @@ void __init setup_arch(char **cmdline_p)
 
        kasan_init();
 
-       if (boot_cpu_data.cpuid_level >= 0) {
-               /* A CPU has %cr4 if and only if it has CPUID */
-               mmu_cr4_features = __read_cr4();
-               if (trampoline_cr4_features)
-                       *trampoline_cr4_features = mmu_cr4_features;
-       }
-
 #ifdef CONFIG_X86_32
        /* sync back kernel address range */
        clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,

diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
index 705e3ff..c5bdc4e 100644 (file)
--- a/arch/x86/realmode/init.c
+++ b/arch/x86/realmode/init.c
@@ -4,6 +4,7 @@
 #include <asm/cacheflush.h>
 #include <asm/pgtable.h>
 #include <asm/realmode.h>
+#include <asm/tlbflush.h>
 
 struct real_mode_header *real_mode_header;
 u32 *trampoline_cr4_features;
@@ -84,7 +85,7 @@ void __init setup_real_mode(void)
 
        trampoline_header->start = (u64) secondary_startup_64;
        trampoline_cr4_features = &trampoline_header->cr4;
-       *trampoline_cr4_features = __read_cr4();
+       *trampoline_cr4_features = mmu_cr4_features;
 
        trampoline_pgd = (u64 *) __va(real_mode_header->trampoline_pgd);
        trampoline_pgd[0] = trampoline_pgd_entry.pgd;