diff options
| author |   Joerg Roedel <jroedel@suse.de> | 2021-12-02 16:32:25 +0100 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2021-12-06 09:54:10 +0100 |
| commit | 71d5049b053876afbde6c3273250b76935494ab2 (patch) | |
| tree | 262b29644cef0c1009776942ea327eff8dbb64e9 /arch/x86/kernel/reboot.c | |
| parent | x86/mm/64: Flush global TLB on boot and AP bringup (diff) | |
| download | linux-dev-71d5049b053876afbde6c3273250b76935494ab2.tar.xz linux-dev-71d5049b053876afbde6c3273250b76935494ab2.zip | |
x86/mm: Flush global TLB when switching to trampoline page-table
Move the switching code into a function so that it can be re-used and
add a global TLB flush. This makes sure that usage of memory which is
not mapped in the trampoline page-table is reliably caught.
Also move the clearing of CR4.PCIDE before the CR3 switch because the
cr4_clear_bits() function will access data not mapped into the
trampoline page-table.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20211202153226.22946-4-joro@8bytes.org
Diffstat (limited to 'arch/x86/kernel/reboot.c')
| -rw-r--r-- | arch/x86/kernel/reboot.c | 12 |
1 files changed, 2 insertions, 10 deletions
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c index 0a40df66a40d..fa700b46588e 100644 --- a/arch/x86/kernel/reboot.c +++ b/arch/x86/kernel/reboot.c @@ -113,17 +113,9 @@ void __noreturn machine_real_restart(unsigned int type) spin_unlock(&rtc_lock); /* - * Switch back to the initial page table. + * Switch to the trampoline page table. */ -#ifdef CONFIG_X86_32 - load_cr3(initial_page_table); -#else - write_cr3(real_mode_header->trampoline_pgd); - - /* Exiting long mode will fail if CR4.PCIDE is set. */ - if (boot_cpu_has(X86_FEATURE_PCID)) - cr4_clear_bits(X86_CR4_PCIDE); -#endif + load_trampoline_pgtable(); /* Jump to the identity-mapped low memory code */ #ifdef CONFIG_X86_32 |