linux.git/arch/x86/entry/common.c, branch master

x86/kvm/vmx: Fix x86_64 CFI build

2026-05-28T09:31:50+00:00

It was missed that idt_do_interrupt_irqoff() gets compiled on x84_64;
this is a problem for CFI builds because it includes an unadorned
indirect call. It is however completely dead code.

Rework things to not emit this function at all.

Fixes: 0701c9e17bd9 ("x86/kvm/vmx: Move IRQ/NMI dispatch from KVM into x86 core")
Reported-by: Nathan Chancellor 
Reported-by: Calvin Owens 
Signed-off-by: Peter Zijlstra (Intel) 
Tested-by: Nathan Chancellor 
Link: https://patch.msgid.link/20260526090631.GA4149641@noisy.programming.kicks-ass.net

x86/kvm/vmx: Fix VMX vs hrtimer_rearm_deferred()

2026-05-19T18:25:51+00:00

Vishal reported that KVM unit test 'x2apic' started failing after commit
0e98eb14814e ("entry: Prepare for deferred hrtimer rearming").

The reason is that KVM/VMX is injecting interrupts while it has interrupts
disabled, for a context that will enable interrupts, this means that
regs->flags.X86_EFLAGS_IF == 0 and irqentry_exit() will not do the right
thing.

Notably, irqentry_exit() must not call hrtimer_rearm_deferred() when the return
context does not have IF set, because this will cause problems vs NMIs.

Therefore, fix up the state after the injection.

Fixes: 0e98eb14814e ("entry: Prepare for deferred hrtimer rearming")
Reported-by: "Verma, Vishal L" 
Suggested-by: Thomas Gleixner 
Signed-off-by: Peter Zijlstra (Intel) 
Signed-off-by: Thomas Gleixner 
Tested-by: "Verma, Vishal L" 
Tested-by: David Woodhouse 
Tested-by: Zhao Liu 
Tested-by: Sean Christopherson 
Reviewed-by: Binbin Wu 
Link: https://patch.msgid.link/20260423155936.957351833@infradead.org
Closes: https://lore.kernel.org/r/70cd3e97fbb796e2eb2ff8cd4b7614ada05a5f24.camel%40intel.com

x86/kvm/vmx: Move IRQ/NMI dispatch from KVM into x86 core

2026-05-19T18:25:51+00:00

Move the VMX interrupt dispatch magic into the x86 core code. This
isolates KVM from the FRED/IDT decisions and reduces the amount of
EXPORT_SYMBOL_FOR_KVM().

Suggested-by: Sean Christopherson 
Signed-off-by: Peter Zijlstra (Intel) 
Signed-off-by: Thomas Gleixner 
Tested-by: "Verma, Vishal L" 
Tested-by: Zhao Liu 
Tested-by: Zhao Liu 
Tested-by: Sean Christopherson 
Reviewed-by: Binbin Wu 
Acked-by: Sean Christopherson 
Link: https://patch.msgid.link/20260508091829.GO3126523@noisy.programming.kicks-ass.net

x86/syscall: Move sys_ni_syscall()

2025-03-19T10:19:17+00:00

Move sys_ni_syscall() to kernel/process.c, and remove the now empty
entry/common.c

No functional changes.

Signed-off-by: Brian Gerst 
Signed-off-by: Ingo Molnar 
Reviewed-by: Sohil Mehta 
Cc: Andy Lutomirski 
Cc: H. Peter Anvin 
Cc: Linus Torvalds 
Cc: Josh Poimboeuf 
Link: https://lore.kernel.org/r/20250314151220.862768-6-brgerst@gmail.com

x86/syscall/64: Move 64-bit syscall dispatch code

2025-03-19T10:19:04+00:00

Move the 64-bit syscall dispatch code to syscall_64.c.

No functional changes.

Signed-off-by: Brian Gerst 
Signed-off-by: Ingo Molnar 
Reviewed-by: Sohil Mehta 
Cc: Andy Lutomirski 
Cc: H. Peter Anvin 
Cc: Linus Torvalds 
Cc: Josh Poimboeuf 
Link: https://lore.kernel.org/r/20250314151220.862768-4-brgerst@gmail.com

x86/syscall/32: Move 32-bit syscall dispatch code

2025-03-19T10:19:01+00:00

Move the 32-bit syscall dispatch code to syscall_32.c.

No functional changes.

Signed-off-by: Brian Gerst 
Signed-off-by: Ingo Molnar 
Reviewed-by: Sohil Mehta 
Cc: Andy Lutomirski 
Cc: H. Peter Anvin 
Cc: Linus Torvalds 
Cc: Josh Poimboeuf 
Link: https://lore.kernel.org/r/20250314151220.862768-3-brgerst@gmail.com

x86/xen: Move Xen upcall handler

2025-03-19T10:18:58+00:00

Move the upcall handler to Xen-specific files.

No functional changes.

Signed-off-by: Brian Gerst 
Signed-off-by: Ingo Molnar 
Reviewed-by: Juergen Gross 
Reviewed-by: Sohil Mehta 
Cc: Andy Lutomirski 
Cc: H. Peter Anvin 
Cc: Linus Torvalds 
Cc: Josh Poimboeuf 
Link: https://lore.kernel.org/r/20250314151220.862768-2-brgerst@gmail.com

x86/entry: Add __init to ia32_emulation_override_cmdline()

2025-03-19T10:17:37+00:00

ia32_emulation_override_cmdline() is an early_param() arg and these
are only needed at boot time. In fact, all other early_param() functions
in arch/x86 seem to have '__init' annotation and
ia32_emulation_override_cmdline() is the only exception.

Fixes: a11e097504ac ("x86: Make IA32_EMULATION boot time configurable")
Signed-off-by: Vitaly Kuznetsov 
Signed-off-by: Dave Hansen 
Signed-off-by: Ingo Molnar 
Reviewed-by: Nikolay Borisov 
Link: https://lore.kernel.org/all/20241210151650.1746022-1-vkuznets%40redhat.com

x86/entry: Fix kernel-doc warning

2025-02-25T22:12:58+00:00

The do_int80_emulation() function is missing a kernel-doc formatted
description of its argument. This is causing a warning when building
with W=1. Add a brief description of the argument to satisfy
kernel-doc.

Reported-by: kernel test robot 
Signed-off-by: Daniel Sneddon 
Signed-off-by: Ingo Molnar 
Link: https://lore.kernel.org/r/20241219155227.685692-1-daniel.sneddon@linux.intel.com
Closes: https://lore.kernel.org/oe-kbuild-all/202412131236.a5HhOqXo-lkp@intel.com/

treewide: context_tracking: Rename CONTEXT_* into CT_STATE_*

2024-07-29T02:03:10+00:00

Context tracking state related symbols currently use a mix of the
CONTEXT_ (e.g. CONTEXT_KERNEL) and CT_SATE_ (e.g. CT_STATE_MASK) prefixes.

Clean up the naming and make the ctx_state enum use the CT_STATE_ prefix.

Suggested-by: Frederic Weisbecker 
Signed-off-by: Valentin Schneider 
Acked-by: Frederic Weisbecker 
Acked-by: Thomas Gleixner 
Signed-off-by: Neeraj Upadhyay