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Borislav Petkov 6c087b0fbf x86/sev: Make the #VC exception stacks part of the default stacks storage 
commit 541ac97186 upstream.

The size of the exception stacks was increased by the commit in Fixes,
resulting in stack sizes greater than a page in size. The #VC exception
handling was only mapping the first (bottom) page, resulting in an
SEV-ES guest failing to boot.

Make the #VC exception stacks part of the default exception stacks
storage and allocate them with a CONFIG_AMD_MEM_ENCRYPT=y .config. Map
them only when a SEV-ES guest has been detected.

Rip out the custom VC stacks mapping and storage code.

 [ bp: Steal and adapt Tom's commit message. ]

Fixes: 7fae4c24a2 ("x86: Increase exception stack sizes")
Signed-off-by: Borislav Petkov <bp@suse.de>
Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Tested-by: Brijesh Singh <brijesh.singh@amd.com>
Link: https://lkml.kernel.org/r/YVt1IMjIs7pIZTRR@zn.tnic
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2021-11-18 19:17:21 +01:00
..
pat x86/pat: Pass valid address to sanitize_phys() 2021-09-02 21:53:18 +02:00
Makefile kbuild: remove cc-option test of -fno-stack-protector 2020-07-07 11:13:10 +09:00
amdtopology.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
cpu_entry_area.c x86/sev: Make the #VC exception stacks part of the default stacks storage 2021-11-18 19:17:21 +01:00
debug_pagetables.c mm: introduce include/linux/pgtable.h 2020-06-09 09:39:13 -07:00
dump_pagetables.c mm: don't include asm/pgtable.h if linux/mm.h is already included 2020-06-09 09:39:13 -07:00
extable.c x86/fpu: Mask PKRU from kernel XRSTOR[S] operations 2021-06-23 19:47:35 +02:00
fault.c x86/mm/64: Improve stack overflow warnings 2021-11-18 19:16:10 +01:00
highmem_32.c x86/mm/highmem: Use generic kmap atomic implementation 2020-11-06 23:14:55 +01:00
hugetlbpage.c mm: remove unneeded includes of <asm/pgalloc.h> 2020-08-07 11:33:26 -07:00
ident_map.c x86/mm/ident_map: Check for errors from ident_pud_init() 2020-10-28 14:48:30 +01:00
init.c memblock: make memblock_find_in_range method private 2021-09-03 09:58:17 -07:00
init_32.c mm/memory_hotplug: remove nid parameter from arch_remove_memory() 2021-09-08 11:50:23 -07:00
init_64.c A set of x86 fixes: 2021-09-19 13:29:36 -07:00
iomap_32.c io-mapping: Cleanup atomic iomap 2020-11-06 23:14:58 +01:00
ioremap.c x86/ioremap: Map EFI-reserved memory as encrypted for SEV 2021-06-08 16:26:55 +02:00
kasan_init_64.c memblock: introduce saner 'memblock_free_ptr()' interface 2021-09-14 13:23:22 -07:00
kaslr.c x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
kmmio.c x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
maccess.c maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault 2020-06-17 10:57:41 -07:00
mem_encrypt.c x86/sev: Add an x86 version of cc_platform_has() 2021-11-18 19:17:21 +01:00
mem_encrypt_boot.S x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
mem_encrypt_identity.c x86/sme: Use #define USE_EARLY_PGTABLE_L5 in mem_encrypt_identity.c 2021-11-18 19:15:56 +01:00
mm_internal.h x86/mm: thread pgprot_t through init_memory_mapping() 2020-04-10 15:36:21 -07:00
mmap.c x86/mm/mmap: Fix -Wmissing-prototypes warnings 2020-04-22 20:19:48 +02:00
mmio-mod.c x86/mmiotrace: Replace deprecated CPU-hotplug functions. 2021-08-10 14:46:27 +02:00
numa.c memblock: introduce saner 'memblock_free_ptr()' interface 2021-09-14 13:23:22 -07:00
numa_32.c x86/mm: Drop deprecated DISCONTIGMEM support for 32-bit 2020-05-28 18:34:30 +02:00
numa_64.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
numa_emulation.c memblock: introduce saner 'memblock_free_ptr()' interface 2021-09-14 13:23:22 -07:00
numa_internal.h
…
pf_in.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
pf_in.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
pgtable.c Revert "mm/pgtable: add stubs for {pmd/pub}_{set/clear}_huge" 2021-07-21 11:28:09 +01:00
pgtable_32.c mm: remove unneeded includes of <asm/pgalloc.h> 2020-08-07 11:33:26 -07:00
physaddr.c mm, x86/mm: Untangle address space layout definitions from basic pgtable type definitions 2019-12-10 10:12:55 +01:00
physaddr.h
…
pkeys.c Fixes and improvements for FPU handling on x86: 2021-07-07 11:12:01 -07:00
pti.c x86/process/64: Move cpu_current_top_of_stack out of TSS 2021-03-28 22:40:10 +02:00
setup_nx.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
srat.c
…
testmmiotrace.c remove ioremap_nocache and devm_ioremap_nocache 2020-01-06 09:45:59 +01:00
tlb.c x86/mm: Prepare for opt-in based L1D flush in switch_mm() 2021-07-28 11:42:24 +02:00