diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/boot/compressed/pgtable_64.c | 22 |
1 files changed, 9 insertions, 13 deletions
diff --git a/arch/x86/boot/compressed/pgtable_64.c b/arch/x86/boot/compressed/pgtable_64.c index f9cc86b2ee55..4213473ae548 100644 --- a/arch/x86/boot/compressed/pgtable_64.c +++ b/arch/x86/boot/compressed/pgtable_64.c @@ -103,7 +103,7 @@ static unsigned long find_trampoline_placement(void) asmlinkage void configure_5level_paging(struct boot_params *bp) { - void (*toggle_la57)(void *trampoline, bool enable_5lvl); + void (*toggle_la57)(void *trampoline); bool l5_required = false; /* Initialize boot_params. Required for cmdline_find_option_bool(). */ @@ -133,6 +133,13 @@ asmlinkage void configure_5level_paging(struct boot_params *bp) ptrs_per_p4d = 512; } + /* + * The trampoline will not be used if the paging mode is already set to + * the desired one. + */ + if (l5_required == !!(native_read_cr4() & X86_CR4_LA57)) + return; + trampoline_32bit = (unsigned long *)find_trampoline_placement(); /* Preserve trampoline memory */ @@ -160,18 +167,8 @@ asmlinkage void configure_5level_paging(struct boot_params *bp) * * The new page table will be used by trampoline code for switching * from 4- to 5-level paging or vice versa. - * - * If switching is not required, the page table is unused: trampoline - * code wouldn't touch CR3. */ - /* - * We are not going to use the page table in trampoline memory if we - * are already in the desired paging mode. - */ - if (l5_required == !!(native_read_cr4() & X86_CR4_LA57)) - goto out; - if (l5_required) { /* * For 4- to 5-level paging transition, set up current CR3 as @@ -194,8 +191,7 @@ asmlinkage void configure_5level_paging(struct boot_params *bp) (void *)src, PAGE_SIZE); } -out: - toggle_la57(trampoline_32bit, l5_required); + toggle_la57(trampoline_32bit); } void cleanup_trampoline(void *pgtable) |