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linux/arch/x86/kernel
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Andi Kleen 32e72854fa x86/tdx: Port I/O: Add early boot support 
TDX guests cannot do port I/O directly. The TDX module triggers a #VE
exception to let the guest kernel emulate port I/O by converting them
into TDCALLs to call the host.

But before IDT handlers are set up, port I/O cannot be emulated using
normal kernel #VE handlers. To support the #VE-based emulation during
this boot window, add a minimal early #VE handler support in early
exception handlers. This is similar to what AMD SEV does. This is
mainly to support earlyprintk's serial driver, as well as potentially
the VGA driver.

The early handler only supports I/O-related #VE exceptions. Unhandled or
failed exceptions will be handled via early_fixup_exceptions() (like
normal exception failures). At runtime I/O-related #VE exceptions (along
with other types) handled by virt_exception_kernel().

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lkml.kernel.org/r/20220405232939.73860-19-kirill.shutemov@linux.intel.com
2022-04-07 08:27:52 -07:00
..
acpi Power management updates for 5.18-rc1 2022-03-21 14:26:28 -07:00
apic bitmap patches for 5.17-rc1 2022-01-23 06:20:44 +02:00
cpu Driver core changes for 5.18-rc1 2022-03-28 12:41:28 -07:00
fpu x86/fpu/xstate: Consolidate size calculations 2022-03-30 12:04:09 +02:00
kprobes x86,kprobes: Fix optprobe trampoline to generate complete pt_regs 2022-03-28 19:38:51 -07:00
.gitignore
alternative.c Add support for Intel CET-IBT, available since Tigerlake (11th gen), which is a 2022-03-27 10:17:23 -07:00
amd_gart_64.c x86/amd_gart: don't set failed sg dma_address to DMA_MAPPING_ERROR 2021-08-09 17:13:06 +02:00
amd_nb.c hwmon updates for v5.17 2022-01-11 10:25:36 -08:00
aperture_64.c proc/vmcore: convert oldmem_pfn_is_ram callback to more generic vmcore callbacks 2021-11-09 10:02:48 -08:00
apm_32.c x86/ibt: Disable IBT around firmware 2022-03-15 10:32:40 +01:00
asm-offsets_32.c x86/stackprotector/32: Make the canary into a regular percpu variable 2021-03-08 13:19:05 +01:00
asm-offsets_64.c x86/xen: Drop USERGS_SYSRET64 paravirt call 2021-02-10 12:32:07 +01:00
asm-offsets.c x86/tdx: Add __tdx_module_call() and __tdx_hypercall() helper functions 2022-04-07 08:27:50 -07:00
audit_64.c audit: add support for the openat2 syscall 2021-10-01 16:52:48 -04:00
bootflag.c
check.c
cpuid.c
crash_core_32.c
crash_core_64.c
crash_dump_32.c
crash_dump_64.c x86/sev: Replace occurrences of sev_active() with cc_platform_has() 2021-10-04 11:46:58 +02:00
crash.c x86/crash: Remove crash_reserve_low_1M() 2021-06-07 12:14:45 +02:00
devicetree.c Devicetree updates for v5.16: 2021-11-02 22:22:13 -07:00
doublefault_32.c exit/doublefault: Remove apparently bogus comment about rewind_stack_do_exit 2021-10-20 13:09:43 -05:00
dumpstack_32.c
dumpstack_64.c x86/mm/64: Improve stack overflow warnings 2021-09-21 13:57:43 +02:00
dumpstack.c x86: remove __range_not_ok() 2022-02-25 09:36:05 +01:00
e820.c x86/boot: Fix memremap of setup_indirect structures 2022-03-09 12:49:44 +01:00
early_printk.c usb: early: xhci-dbc: Remove duplicate keep parsing 2022-03-15 18:20:34 +01:00
early-quirks.c Merge drm/drm-next into drm-intel-next 2022-01-31 13:19:33 -05:00
ebda.c
eisa.c
espfix_64.c
ftrace_32.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
ftrace_64.S x86/ibt,ftrace: Annotate ftrace code patching 2022-03-15 10:32:41 +01:00
ftrace.c x86/ibt,ftrace: Make function-graph play nice 2022-03-15 10:32:37 +01:00
head32.c
head64.c x86/tdx: Port I/O: Add early boot support 2022-04-07 08:27:52 -07:00
head_32.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
head_64.S x86/ibt,sev: Annotations 2022-03-15 10:32:41 +01:00
hpet.c rtc: Check return value from mc146818_get_time() 2021-12-16 21:50:06 +01:00
hw_breakpoint.c x86/debug: Prevent data breakpoints on cpu_dr7 2021-02-05 20:13:12 +01:00
i8237.c
i8253.c
i8259.c x86: Avoid magic number with ELCR register accesses 2021-08-10 23:31:43 +02:00
idt.c x86/traps: Add #VE support for TDX guest 2022-04-07 08:27:51 -07:00
io_delay.c
ioport.c
irq_32.c x86/softirq: Disable softirq stacks on PREEMPT_RT 2021-09-27 12:28:32 +02:00
irq_64.c x86/softirq/64: Inline do_softirq_own_stack() 2021-02-10 23:34:17 +01:00
irq_work.c
irq.c x86/irq: Ensure PI wakeup handler is unregistered before module unload 2021-10-22 12:45:35 -04:00
irqflags.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
irqinit.c
itmt.c x86/sched: Decrease further the priorities of SMT siblings 2021-10-05 15:51:59 +02:00
jailhouse.c
jump_label.c jump_labels: Mark __jump_label_transform() as __always_inlined to work around aggressive compiler un-inlining 2021-07-13 06:32:05 +02:00
kdebugfs.c x86/boot: Fix memremap of setup_indirect structures 2022-03-09 12:49:44 +01:00
kexec-bzimage64.c x86: Use ELF fields defined in 'struct kimage' 2021-03-08 12:06:29 -07:00
kgdb.c x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
ksysfs.c x86/boot: Fix memremap of setup_indirect structures 2022-03-09 12:49:44 +01:00
kvm.c * Only do MSR filtering for MSRs accessed by rdmsr/wrmsr 2022-04-02 12:09:02 -07:00
kvmclock.c x86/kvmclock: Fix Hyper-V Isolated VM's boot issue when vCPUs > 64 2022-02-25 10:09:34 -05:00
ldt.c memcg: enable accounting for ldt_struct objects 2021-09-03 09:58:13 -07:00
machine_kexec_32.c x86/kexec: Set_[gi]dt() -> native_[gi]dt_invalidate() in machine_kexec_*.c 2021-05-21 12:36:45 +02:00
machine_kexec_64.c x86/ibt,kexec: Disable CET on kexec 2022-03-15 10:32:39 +01:00
Makefile x86,rethook,kprobes: Replace kretprobe with rethook on x86 2022-03-28 19:38:51 -07:00
mmconf-fam10h_64.c x86/msr: Rename MSR_K8_SYSCFG to MSR_AMD64_SYSCFG 2021-05-10 07:51:38 +02:00
module.c Add support for Intel CET-IBT, available since Tigerlake (11th gen), which is a 2022-03-27 10:17:23 -07:00
mpparse.c x86: Avoid magic number with ELCR register accesses 2021-08-10 23:31:43 +02:00
msr.c x86/MSR: Filter MSR writes through X86_IOC_WRMSR_REGS ioctl too 2021-01-27 19:06:47 +01:00
nmi_selftest.c
nmi.c x86/nmi: Remove the 'strange power saving mode' hint from unknown NMI handler 2022-03-16 11:02:41 +01:00
paravirt-spinlocks.c x86/paravirt: Add new features for paravirt patching 2021-03-11 19:51:49 +01:00
paravirt.c x86/ibt,paravirt: Sprinkle ENDBR 2022-03-15 10:32:36 +01:00
pci-dma.c
pci-iommu_table.c x86: Remove definition of DEBUG 2021-01-15 08:23:10 +01:00
pci-swiotlb.c x86/sme: Replace occurrences of sme_active() with cc_platform_has() 2021-10-04 11:46:46 +02:00
pcspeaker.c
perf_regs.c
platform-quirks.c
pmem.c
probe_roms.c x86/pci/probe_roms: Use to_pci_driver() instead of pci_dev->driver 2021-10-18 09:20:15 -05:00
process_32.c x86/fpu: Move context switch and exit to user inlines into sched.h 2021-10-20 15:27:27 +02:00
process_64.c x86: Remove toolchain check for X32 ABI capability 2022-03-15 10:32:48 +01:00
process.c x86/tdx: Add HLT support for TDX guests 2022-04-07 08:27:51 -07:00
process.h x86: Snapshot thread flags 2021-12-01 00:06:43 +01:00
ptrace.c ptrace: Cleanups for v5.18 2022-03-28 17:29:53 -07:00
pvclock.c x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
quirks.c
reboot_fixups_32.c
reboot.c x86/mm: Flush global TLB when switching to trampoline page-table 2021-12-06 09:54:10 +01:00
relocate_kernel_32.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
relocate_kernel_64.S x86/ibt: Annotate text references 2022-03-15 10:32:40 +01:00
resource.c x86/PCI: revert "Ignore E820 reservations for bridge windows on newer systems" 2022-02-09 19:42:58 +01:00
rethook.c x86,rethook: Fix arch_rethook_trampoline() to generate a complete pt_regs 2022-03-28 19:38:51 -07:00
rtc.c
setup_percpu.c mm: percpu: add generic pcpu_populate_pte() function 2022-01-20 08:52:52 +02:00
setup.c x86/setup: use IS_ENABLED(CONFIG_KEXEC_CORE) instead of #ifdef 2022-03-23 19:00:34 -07:00
sev_verify_cbit.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
sev-shared.c x86/sev: Shorten GHCB terminate macro names 2021-11-15 20:31:16 +01:00
sev.c - Add support for decoding instructions which do MMIO accesses in order 2022-01-10 10:00:03 -08:00
signal_compat.c signal: Verify the alignment and size of siginfo_t 2021-07-23 13:15:31 -05:00
signal.c tracehook: Remove tracehook.h 2022-03-10 16:51:51 -06:00
smp.c x86: Fix various typos in comments, take #2 2021-03-21 23:50:28 +01:00
smpboot.c x86/ACPI: CPPC: Move init_freq_invariance_cppc() into x86 CPPC 2022-03-08 19:16:43 +01:00
stacktrace.c x86: remove __range_not_ok() 2022-02-25 09:36:05 +01:00
static_call.c x86: Add straight-line-speculation mitigation 2021-12-09 13:32:25 +01:00
step.c entry: Ensure trap after single-step on system call return 2021-02-06 00:21:42 +01:00
sys_ia32.c
sys_x86_64.c x86/mm: Refine mmap syscall implementation 2021-01-05 19:07:42 +01:00
tboot.c x86/boot/tboot: Avoid Wstringop-overread-warning 2021-03-23 00:16:13 +01:00
time.c
tls.c x86/stackprotector/32: Make the canary into a regular percpu variable 2021-03-08 13:19:05 +01:00
tls.h
topology.c drivers/base/node: consolidate node device subsystem initialization in node_dev_init() 2022-03-22 15:57:10 -07:00
trace_clock.c
trace.c trace/osnoise: Fix an ifdef comment 2021-10-25 23:02:36 -04:00
tracepoint.c
traps.c x86/traps: Add #VE support for TDX guest 2022-04-07 08:27:51 -07:00
tsc_msr.c
tsc_sync.c x86/tsc: Add a timer to make sure TSC_adjust is always checked 2021-12-02 00:40:35 +01:00
tsc.c x86/tsc: Be consistent about use_tsc_delay() 2022-03-15 18:20:33 +01:00
umip.c x86/umip: Downgrade warning messages to debug loglevel 2021-09-25 13:23:28 +02:00
unwind_frame.c x86/unwind: Recover kretprobe trampoline entry 2021-09-30 21:24:07 -04:00
unwind_guess.c x86/unwind: Recover kretprobe trampoline entry 2021-09-30 21:24:07 -04:00
unwind_orc.c x86,rethook,kprobes: Replace kretprobe with rethook on x86 2022-03-28 19:38:51 -07:00
uprobes.c x86/uprobes: Convert to insn_decode() 2021-03-15 12:05:03 +01:00
verify_cpu.S x86: Prepare asm files for straight-line-speculation 2021-12-08 12:25:37 +01:00
vm86_32.c signal: Replace force_fatal_sig with force_exit_sig when in doubt 2021-11-19 09:15:58 -06:00
vmlinux.lds.S objtool: Find unused ENDBR instructions 2022-03-15 10:32:47 +01:00
vsmp_64.c
x86_init.c x86/mm/cpa: Generalize __set_memory_enc_pgtable() 2022-02-23 19:14:29 +01:00