From: Joerg Roedel <jroedel@xxxxxxx> Hi, here is the fourth version of the SEV-ES Guest Support patches. I addressed the review comments sent to me for the previous version and rebased the code v5.8-rc5. The biggest change in this version is the IST handling code for the #VC handler. I adapted the entry code for the #VC handler to the big pile of entry code changes merged into v5.8-rc1, which means it no longer uses IST shifting (with one exception in the NMI handler, but that is not ist-shifting as implemented previously). The #VC entry code now tries to pretend that the #VC handler does not use an IST stack by switching to the task stack if entered from user-mode or the SYSCALL entry path. When it is entered from kernel-mode it is doing its best to switch back to the interrupted stack. This is only possible if it is entered from a known and safe kernel stack (e.g. not the entry stack). If the previous stack is not safe to use the #VC handler switches to a fall-back stack and calls a special handler function which, as of now, just panics the system. For now this is safe as #VC exceptions only happen at know places which use a safe stack. The use of the fall-back stack is necessary so that the special handler function can safely raise nested #VC exceptions, for example to print a panic message. This implementation has survived overnight stress testing (>14h) with 'perf top' running for NMI-load and three instances of the x86-selftests in a loop. A git-tree with these patches applied can be found at: https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git/log/?h=sev-es-client-v5.8-rc5 Changes to the previous version: * Addressed review comments * Rebased to v5.8-rc5 * Addressed kbuild-bot reports * Removed CPUID caching for now * Re-implemented IST handling so that the #VC handler supports nesting The previous post of the patch-set can be found here: v3: https://lore.kernel.org/lkml/20200428151725.31091-1-joro@xxxxxxxxxx/ v2: https://lore.kernel.org/lkml/20200319091407.1481-1-joro@xxxxxxxxxx/ v1: https://lore.kernel.org/lkml/20200211135256.24617-1-joro@xxxxxxxxxx/ Please review. Thanks, Joerg Borislav Petkov (1): KVM: SVM: Use __packed shorthand Doug Covelli (1): x86/vmware: Add VMware specific handling for VMMCALL under SEV-ES Joerg Roedel (53): KVM: SVM: Add GHCB Accessor functions x86/traps: Move pf error codes to <asm/trap_pf.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_has_rep_prefix() helper 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 set_page_en/decrypted() helpers x86/boot/compressed/64: Setup GHCB Based VC Exception handler x86/boot/compressed/64: Unmap GHCB page before booting the kernel 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: Print SEV-ES info into kernel log 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: Allocate and Map stacks for #VC handler x86/sev-es: Allocate and setup IST entry for #VC x86/sev-es: Adjust #VC IST Stack on entering NMI handler x86/dumpstack/64: Add noinstr version of get_stack_info() x86/entry/64: Add entry code for #VC handler x86/sev-es: Wire up existing #VC exit-code handlers x86/sev-es: Handle instruction fetches from user-space x86/sev-es: Handle MMIO String Instructions 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: Setup TSS early for secondary CPUs 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/sev-es: Handle NMI State Martin Radev (1): x86/sev-es: Check required CPU features for SEV-ES Tom Lendacky (19): 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(P) 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 x86/efi: Add GHCB mappings when SEV-ES is active arch/x86/Kconfig | 1 + arch/x86/boot/Makefile | 2 +- arch/x86/boot/compressed/Makefile | 9 +- arch/x86/boot/compressed/head_64.S | 32 +- arch/x86/boot/compressed/ident_map_64.c | 349 +++++ arch/x86/boot/compressed/idt_64.c | 54 + arch/x86/boot/compressed/idt_handlers_64.S | 77 ++ arch/x86/boot/compressed/kaslr.c | 36 +- arch/x86/boot/compressed/kaslr_64.c | 153 --- arch/x86/boot/compressed/misc.c | 7 + arch/x86/boot/compressed/misc.h | 45 +- arch/x86/boot/compressed/sev-es.c | 214 +++ arch/x86/entry/entry_64.S | 78 ++ arch/x86/include/asm/cpu.h | 2 +- arch/x86/include/asm/cpu_entry_area.h | 33 +- arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/include/asm/desc.h | 27 + arch/x86/include/asm/desc_defs.h | 10 + arch/x86/include/asm/fpu/internal.h | 33 +- arch/x86/include/asm/fpu/xcr.h | 37 + arch/x86/include/asm/idtentry.h | 49 + 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/page_64_types.h | 1 + arch/x86/include/asm/pgtable.h | 2 +- arch/x86/include/asm/processor.h | 1 + arch/x86/include/asm/proto.h | 1 + arch/x86/include/asm/realmode.h | 4 + arch/x86/include/asm/segment.h | 2 +- arch/x86/include/asm/setup.h | 3 +- arch/x86/include/asm/sev-es.h | 97 ++ arch/x86/include/asm/stacktrace.h | 2 + arch/x86/include/asm/svm.h | 118 +- arch/x86/include/asm/trap_pf.h | 24 + arch/x86/include/asm/trapnr.h | 1 + arch/x86/include/asm/traps.h | 20 +- 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 | 3 +- arch/x86/kernel/cpu/scattered.c | 1 + arch/x86/kernel/cpu/vmware.c | 50 +- arch/x86/kernel/dumpstack.c | 7 +- arch/x86/kernel/dumpstack_64.c | 47 +- arch/x86/kernel/head64.c | 106 +- arch/x86/kernel/head_32.S | 4 +- arch/x86/kernel/head_64.S | 176 ++- arch/x86/kernel/idt.c | 43 +- arch/x86/kernel/kvm.c | 35 +- arch/x86/kernel/nmi.c | 12 + arch/x86/kernel/sev-es-shared.c | 507 +++++++ arch/x86/kernel/sev-es.c | 1403 ++++++++++++++++++++ arch/x86/kernel/smpboot.c | 4 +- arch/x86/kernel/traps.c | 56 + arch/x86/kernel/umip.c | 49 +- arch/x86/kvm/svm/svm.c | 2 + arch/x86/lib/insn-eval.c | 130 ++ arch/x86/mm/cpu_entry_area.c | 3 +- arch/x86/mm/extable.c | 1 + arch/x86/mm/mem_encrypt.c | 38 +- arch/x86/mm/mem_encrypt_identity.c | 3 + arch/x86/platform/efi/efi_64.c | 10 + arch/x86/realmode/init.c | 24 +- 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 +- 68 files changed, 3964 insertions(+), 444 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_pf.h create mode 100644 arch/x86/kernel/sev-es-shared.c create mode 100644 arch/x86/kernel/sev-es.c -- 2.27.0
