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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-06 09:32:47 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-06 09:32:47 +0100 |
| commit | f5bced9f34355d2b12779eebdf2634cb27c18cff (patch) | |
| tree | d636906d3aeb78eecc48b6d1e5d0b44b58cd8016 /arch/x86/realmode/init.c | |
| parent | 13a5fad39a7b781c21d9528bcf52a5f5babafe99 (diff) | |
| parent | 0fcfb00b28c0b7884635dacf38e46d60bf3d4eb1 (diff) | |
| download | linux-f5bced9f34355d2b12779eebdf2634cb27c18cff.tar.gz linux-f5bced9f34355d2b12779eebdf2634cb27c18cff.tar.bz2 linux-f5bced9f34355d2b12779eebdf2634cb27c18cff.zip | |
Merge 5.16-rc4 into tty-next
We need the tty/serial driver fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86/realmode/init.c')
| -rw-r--r-- | arch/x86/realmode/init.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c index 4a3da7592b99..38d24d2ab38b 100644 --- a/arch/x86/realmode/init.c +++ b/arch/x86/realmode/init.c @@ -72,6 +72,7 @@ static void __init setup_real_mode(void) #ifdef CONFIG_X86_64 u64 *trampoline_pgd; u64 efer; + int i; #endif base = (unsigned char *)real_mode_header; @@ -128,8 +129,17 @@ static void __init setup_real_mode(void) trampoline_header->flags = 0; trampoline_pgd = (u64 *) __va(real_mode_header->trampoline_pgd); + + /* Map the real mode stub as virtual == physical */ trampoline_pgd[0] = trampoline_pgd_entry.pgd; - trampoline_pgd[511] = init_top_pgt[511].pgd; + + /* + * Include the entirety of the kernel mapping into the trampoline + * PGD. This way, all mappings present in the normal kernel page + * tables are usable while running on trampoline_pgd. + */ + for (i = pgd_index(__PAGE_OFFSET); i < PTRS_PER_PGD; i++) + trampoline_pgd[i] = init_top_pgt[i].pgd; #endif sme_sev_setup_real_mode(trampoline_header); |