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x86/boot/compressed/64: Cleanup exception handling before booting kernel

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Disable the exception handling before booting the kernel to make sure
any exceptions that happen during early kernel boot are not directed to
the pre-decompression code.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210312123824.306-2-joro@8bytes.org
This commit is contained in:
Joerg Roedel 2021-03-10 09:43:19 +01:00 committed by Borislav Petkov
parent afb4a37778
commit b099155e2d
3 changed files with 22 additions and 5 deletions
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14
arch/x86/boot/compressed/idt_64.c
View File

@ -52,3 +52,17 @@ void load_stage2_idt(void)
load_boot_idt(&boot_idt_desc);
}
void cleanup_exception_handling(void)
{
/*
* Flush GHCB from cache and map it encrypted again when running as
* SEV-ES guest.
*/
sev_es_shutdown_ghcb();
/* Set a null-idt, disabling #PF and #VC handling */
boot_idt_desc.size = 0;
boot_idt_desc.address = 0;
load_boot_idt(&boot_idt_desc);
}

7
arch/x86/boot/compressed/misc.c
View File

@ -443,11 +443,8 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
handle_relocations(output, output_len, virt_addr);
debug_putstr("done.\nBooting the kernel.\n");
/*
* Flush GHCB from cache and map it encrypted again when running as
* SEV-ES guest.
*/
sev_es_shutdown_ghcb();
/* Disable exception handling before booting the kernel */
cleanup_exception_handling();
return output;
}

6
arch/x86/boot/compressed/misc.h
View File

@ -155,6 +155,12 @@ extern pteval_t __default_kernel_pte_mask;
extern gate_desc boot_idt[BOOT_IDT_ENTRIES];
extern struct desc_ptr boot_idt_desc;
#ifdef CONFIG_X86_64
void cleanup_exception_handling(void);
#else
static inline void cleanup_exception_handling(void) { }
#endif
/* IDT Entry Points */
void boot_page_fault(void);
void boot_stage1_vc(void);