From: Ashish Kalra <ashish.kalra@xxxxxxx>
The patchset adds bits and pieces to get kexec (and crashkernel) work on
SNP guest.
v4:
- Rebased to current tip/master.
- Reviewed-bys from Sathya.
- Remove snp_kexec_unprep_rom_memory() as it is not needed any more as
SEV-SNP code is not validating the ROM range in probe_roms() anymore.
- Fix kernel test robot build error/warnings.
v3:
- Rebased;
- moved Keep page tables that maps E820_TYPE_ACPI patch to Kirill's tdx
guest kexec patch series.
- checking the md attribute instead of checking the efi_setup for
detecting if running under kexec kernel.
- added new sev_es_enabled() function.
- skip video memory access in decompressor for SEV-ES/SNP systems to
prevent guest termination as boot stage2 #VC handler does not handle
MMIO.
v2:
- address zeroing of unaccepted memory table mappings at all page table levels
adding phys_pte_init(), phys_pud_init() and phys_p4d_init().
- include skip efi_arch_mem_reserve() in case of kexec as part of this
patch set.
- rename last_address_shd_kexec to a more appropriate
kexec_last_address_to_make_private.
- remove duplicate code shared with TDX and use common interfaces
defined for SNP and TDX for kexec/kdump.
- remove set_pte_enc() dependency on pg_level_to_pfn() and make the
function simpler.
- rename unshare_pte() to make_pte_private().
- clarify and make the comment for using kexec_last_address_to_make_private
more understandable.
- general cleanup.
Ashish Kalra (4):
efi/x86: skip efi_arch_mem_reserve() in case of kexec.
x86/sev: add sev_es_enabled() function.
x86/boot/compressed: Skip Video Memory access in Decompressor for
SEV-ES/SNP.
x86/snp: Convert shared memory back to private on kexec
arch/x86/boot/compressed/misc.c | 6 +-
arch/x86/boot/compressed/misc.h | 1 +
arch/x86/boot/compressed/sev.c | 5 +
arch/x86/boot/compressed/sev.h | 2 +
arch/x86/include/asm/sev.h | 4 +
arch/x86/kernel/sev.c | 161 ++++++++++++++++++++++++++++++++
arch/x86/mm/mem_encrypt_amd.c | 3 +
arch/x86/platform/efi/quirks.c | 20 +++-
8 files changed, 198 insertions(+), 4 deletions(-)
--
2.34.1
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