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Groups > linux.kernel > #1545687
| From | tip-bot for Borislav Petkov <tipbot@zytor.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [tip:x86/urgent] x86/microcode/AMD: Reload proper initrd start address |
| Date | 2016-12-21 11:00 +0100 |
| Message-ID | <sQLQJ-1IF-5@gated-at.bofh.it> (permalink) |
| References | <sQtTP-6Qf-13@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Commit-ID: 8877ebdd3f9a3ffc84c4b67562d257c5f553bc49 Gitweb: http://git.kernel.org/tip/8877ebdd3f9a3ffc84c4b67562d257c5f553bc49 Author: Borislav Petkov <bp@suse.de> AuthorDate: Tue, 20 Dec 2016 11:54:30 +0100 Committer: Thomas Gleixner <tglx@linutronix.de> CommitDate: Wed, 21 Dec 2016 10:50:04 +0100 x86/microcode/AMD: Reload proper initrd start address When we switch to virtual addresses and, especially after reserve_initrd()->relocate_initrd() have run, we have the updated initrd address in initrd_start. Use initrd_start then instead of the address which has been passed to us through boot params. (That still gets used when we're running the very early routines on the BSP). Reported-and-tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: http://lkml.kernel.org/r/20161220144012.lc4cwrg6dphqbyqu@pd.tnic Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- arch/x86/kernel/cpu/microcode/core.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c index c4bb2f7..2af69d2 100644 --- a/arch/x86/kernel/cpu/microcode/core.c +++ b/arch/x86/kernel/cpu/microcode/core.c @@ -243,14 +243,12 @@ struct cpio_data find_microcode_in_initrd(const char *path, bool use_pa) # endif /* - * Did we relocate the ramdisk? - * - * So we possibly relocate the ramdisk *after* applying microcode on the - * BSP so we rely on use_pa (use physical addresses) - even if it is not - * absolutely correct - to determine whether we've done the ramdisk - * relocation already. + * Fixup the start address: after reserve_initrd() runs, initrd_start + * has the virtual address of the beginning of the initrd. It also + * possibly relocates the ramdisk. In either case, initrd_start contains + * the updated address so use that instead. */ - if (!use_pa && relocated_ramdisk) + if (!use_pa && initrd_start) start = initrd_start; return find_cpio_data(path, (void *)start, size, NULL);
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Re: [PATCH] x86/microcode: Adjust ramdisk address when accessing by virtual address Borislav Petkov <bp@alien8.de> - 2016-12-19 16:40 +0100
Re: [PATCH] x86/microcode: Adjust ramdisk address when accessing by virtual address Borislav Petkov <bp@alien8.de> - 2016-12-19 17:50 +0100
Re: [PATCH] x86/microcode: Adjust ramdisk address when accessing by virtual address Borislav Petkov <bp@alien8.de> - 2016-12-19 19:10 +0100
Re: [PATCH] x86/microcode: Adjust ramdisk address when accessing by virtual address Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-12-19 19:20 +0100
Re: [PATCH] x86/microcode: Adjust ramdisk address when accessing by virtual address Borislav Petkov <bp@alien8.de> - 2016-12-19 19:50 +0100
Re: [PATCH] x86/microcode: Adjust ramdisk address when accessing by virtual address Borislav Petkov <bp@alien8.de> - 2016-12-20 00:40 +0100
Re: [PATCH] x86/microcode: Adjust ramdisk address when accessing by virtual address Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-12-20 02:30 +0100
Re: [PATCH] x86/microcode: Adjust ramdisk address when accessing by virtual address Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-12-20 02:50 +0100
Re: [PATCH] x86/microcode: Adjust ramdisk address when accessing by virtual address Borislav Petkov <bp@alien8.de> - 2016-12-20 15:50 +0100
Re: [PATCH] x86/microcode: Adjust ramdisk address when accessing by virtual address Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-12-20 20:30 +0100
Re: [PATCH] x86/microcode: Adjust ramdisk address when accessing by virtual address Borislav Petkov <bp@alien8.de> - 2016-12-20 20:40 +0100
Re: [PATCH] x86/microcode: Adjust ramdisk address when accessing by virtual address Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-12-20 23:50 +0100
Re: [PATCH] x86/microcode: Adjust ramdisk address when accessing by virtual address Borislav Petkov <bp@alien8.de> - 2016-12-21 00:00 +0100
[tip:x86/urgent] x86/microcode/AMD: Reload proper initrd start address tip-bot for Borislav Petkov <tipbot@zytor.com> - 2016-12-21 11:00 +0100
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