[RFC PATCH 00/70 v2] x86: SEV-ES Guest Support

Joerg Roedel
2020-03-19T09:14:21Z

Hi,

here is an updated version of the patch-set to enable Linux to run as a
guest in an SEV-ES enabled Hypervisor. The first version can be found
here:

https://lore.kernel.org/lkml/20200211135256.24617-1-joro@8bytes.org/

The first post also includes a more elaborate description of the
implementation requirements and details. A branch containing these
patches is here:

https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git/log/?h=sev-es-client-v5.6-rc6

There are lots of small changes since the first version, here is a list
of the major ones, which address most of the valuable review comments I
received, thanks for that!

Changes since v1:

- Rebased to v5.6-rc6

- Factored out instruction decoding part of the UMIP handler and
re-used it in the SEV-ES code.

- Several enhancements of the instruction decoder as needed by
SEV-ES

- The instruction fetch and memory access code for instruction
emulation now handles different user execution modes as well
as segment bases.

- Added emulation of (REP) MOVS instructions

- Added handling for nesting #VC handlers - which fixed the NMI
issues.

- Pass error_code as a parameter to the #VC exception handlers

- Reworked early exception dispatch function

- Moved the GHCB pages out of the per-cpu areas and only
allocate them when they are actually needed. The per-cpu areas
only store a pointer now.

- Removed emulation for INVD, now it will just cause an error if
used.

- Added prefixes to the function names.

- Fixed a bug which broke bare-metal boot with mem_encrypt=on

The last missing change I have on my list is to rework the NMI handling
patch. I decided to postpone this until Thomas' Gleixners rework of the
x86 entry code is ready and merged, because the NMI handling will
conflict with these changes.

Please review.

Thanks,

Joerg

Doug Covelli (1):
x86/vmware: Add VMware specific handling for VMMCALL under SEV-ES

Joerg Roedel (51):
KVM: SVM: Add GHCB Accessor functions
x86/traps: Move some definitions to <asm/trap_defs.h>
x86/insn: Make inat-tables.c suitable for pre-decompression code
x86/umip: Factor out instruction fetch
x86/umip: Factor out instruction decoding
x86/insn: Add insn_get_modrm_reg_off()
x86/insn: Add insn_rep_prefix() helper
x86/boot/compressed: Fix debug_puthex() parameter type
x86/boot/compressed/64: Disable red-zone usage
x86/boot/compressed/64: Add IDT Infrastructure
x86/boot/compressed/64: Rename kaslr_64.c to ident_map_64.c
x86/boot/compressed/64: Add page-fault handler
x86/boot/compressed/64: Always switch to own page-table
x86/boot/compressed/64: Don't pre-map memory in KASLR code
x86/boot/compressed/64: Change add_identity_map() to take start and
end
x86/boot/compressed/64: Add stage1 #VC handler
x86/boot/compressed/64: Call set_sev_encryption_mask earlier
x86/boot/compressed/64: Check return value of
kernel_ident_mapping_init()
x86/boot/compressed/64: Add function to map a page unencrypted
x86/boot/compressed/64: Setup GHCB Based VC Exception handler
x86/fpu: Move xgetbv()/xsetbv() into separate header
x86/idt: Move IDT to data segment
x86/idt: Split idt_data setup out of set_intr_gate()
x86/idt: Move two function from k/idt.c to i/a/desc.h
x86/head/64: Install boot GDT
x86/head/64: Reload GDT after switch to virtual addresses
x86/head/64: Load segment registers earlier
x86/head/64: Switch to initial stack earlier
x86/head/64: Build k/head64.c with -fno-stack-protector
x86/head/64: Load IDT earlier
x86/head/64: Move early exception dispatch to C code
x86/sev-es: Add SEV-ES Feature Detection
x86/sev-es: Compile early handler code into kernel image
x86/sev-es: Setup early #VC handler
x86/sev-es: Setup GHCB based boot #VC handler
x86/sev-es: Support nested #VC exceptions
x86/sev-es: Wire up existing #VC exit-code handlers
x86/sev-es: Handle instruction fetches from user-space
x86/sev-es: Harden runtime #VC handler for exceptions from user-space
x86/sev-es: Filter exceptions not supported from user-space
x86/sev-es: Handle MMIO String Instructions
x86/sev-es: Handle RDTSCP Events
x86/sev-es: Handle #AC Events
x86/sev-es: Handle #DB Events
x86/paravirt: Allow hypervisor specific VMMCALL handling under SEV-ES
x86/realmode: Add SEV-ES specific trampoline entry point
x86/head/64: Don't call verify_cpu() on starting APs
x86/head/64: Rename start_cpu0
x86/sev-es: Support CPU offline/online
x86/cpufeature: Add SEV_ES_GUEST CPU Feature
x86/sev-es: Add NMI state tracking

Tom Lendacky (18):
KVM: SVM: Add GHCB definitions
x86/cpufeatures: Add SEV-ES CPU feature
x86/sev-es: Add support for handling IOIO exceptions
x86/sev-es: Add CPUID handling to #VC handler
x86/sev-es: Setup per-cpu GHCBs for the runtime handler
x86/sev-es: Add Runtime #VC Exception Handler
x86/sev-es: Handle MMIO events
x86/sev-es: Handle MSR events
x86/sev-es: Handle DR7 read/write events
x86/sev-es: Handle WBINVD Events
x86/sev-es: Handle RDTSC Events
x86/sev-es: Handle RDPMC Events
x86/sev-es: Handle INVD Events
x86/sev-es: Handle MONITOR/MONITORX Events
x86/sev-es: Handle MWAIT/MWAITX Events
x86/sev-es: Handle VMMCALL Events
x86/kvm: Add KVM specific VMMCALL handling under SEV-ES
x86/realmode: Setup AP jump table

arch/x86/Kconfig | 1 +
arch/x86/boot/Makefile | 2 +-
arch/x86/boot/compressed/Makefile | 8 +-
arch/x86/boot/compressed/head_64.S | 41 +
arch/x86/boot/compressed/ident_map_64.c | 320 ++++++
arch/x86/boot/compressed/idt_64.c | 53 +
arch/x86/boot/compressed/idt_handlers_64.S | 82 ++
arch/x86/boot/compressed/kaslr.c | 36 +-
arch/x86/boot/compressed/kaslr_64.c | 153 ---
arch/x86/boot/compressed/misc.h | 34 +-
arch/x86/boot/compressed/sev-es.c | 177 +++
arch/x86/entry/entry_64.S | 52 +
arch/x86/include/asm/cpu.h | 2 +-
arch/x86/include/asm/cpufeatures.h | 2 +
arch/x86/include/asm/desc.h | 28 +
arch/x86/include/asm/desc_defs.h | 10 +
arch/x86/include/asm/fpu/internal.h | 29 +-
arch/x86/include/asm/fpu/xcr.h | 32 +
arch/x86/include/asm/insn-eval.h | 6 +
arch/x86/include/asm/mem_encrypt.h | 5 +
arch/x86/include/asm/msr-index.h | 3 +
arch/x86/include/asm/pgtable.h | 2 +-
arch/x86/include/asm/processor.h | 1 +
arch/x86/include/asm/realmode.h | 4 +
arch/x86/include/asm/segment.h | 2 +-
arch/x86/include/asm/setup.h | 1 -
arch/x86/include/asm/sev-es.h | 119 ++
arch/x86/include/asm/svm.h | 103 ++
arch/x86/include/asm/trap_defs.h | 50 +
arch/x86/include/asm/traps.h | 51 +-
arch/x86/include/asm/x86_init.h | 16 +-
arch/x86/include/uapi/asm/svm.h | 11 +
arch/x86/kernel/Makefile | 5 +
arch/x86/kernel/cpu/amd.c | 9 +-
arch/x86/kernel/cpu/scattered.c | 1 +
arch/x86/kernel/cpu/vmware.c | 50 +-
arch/x86/kernel/head64.c | 57 +-
arch/x86/kernel/head_32.S | 4 +-
arch/x86/kernel/head_64.S | 169 ++-
arch/x86/kernel/idt.c | 52 +-
arch/x86/kernel/kvm.c | 35 +-
arch/x86/kernel/nmi.c | 8 +
arch/x86/kernel/sev-es-shared.c | 444 ++++++++
arch/x86/kernel/sev-es.c | 1165 ++++++++++++++++++++
arch/x86/kernel/smpboot.c | 4 +-
arch/x86/kernel/traps.c | 3 +
arch/x86/kernel/umip.c | 49 +-
arch/x86/lib/insn-eval.c | 130 +++
arch/x86/mm/extable.c | 1 +
arch/x86/mm/mem_encrypt.c | 11 +-
arch/x86/mm/mem_encrypt_identity.c | 3 +
arch/x86/realmode/init.c | 12 +
arch/x86/realmode/rm/header.S | 3 +
arch/x86/realmode/rm/trampoline_64.S | 20 +
arch/x86/tools/gen-insn-attr-x86.awk | 50 +-
tools/arch/x86/tools/gen-insn-attr-x86.awk | 50 +-
56 files changed, 3352 insertions(+), 419 deletions(-)
create mode 100644 arch/x86/boot/compressed/ident_map_64.c
create mode 100644 arch/x86/boot/compressed/idt_64.c
create mode 100644 arch/x86/boot/compressed/idt_handlers_64.S
delete mode 100644 arch/x86/boot/compressed/kaslr_64.c
create mode 100644 arch/x86/boot/compressed/sev-es.c
create mode 100644 arch/x86/include/asm/fpu/xcr.h
create mode 100644 arch/x86/include/asm/sev-es.h
create mode 100644 arch/x86/include/asm/trap_defs.h
create mode 100644 arch/x86/kernel/sev-es-shared.c
create mode 100644 arch/x86/kernel/sev-es.c

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2.17.1