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x86/entry: Convert KVM vectors to IDTENTRY_SYSVEC*

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Convert KVM specific system vectors to IDTENTRY_SYSVEC*:

The two empty stub handlers which only increment the stats counter do no
need to run on the interrupt stack. Use IDTENTRY_SYSVEC_SIMPLE for them.

The wakeup handler does more work and runs on the interrupt stack.

None of these handlers need to save and restore the irq_regs pointer.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20200521202119.555715519@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-05-21 22:05:42 +02:00
parent 720909a7ab
commit 9c3b1f4975
7 changed files with 15 additions and 42 deletions
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24
arch/x86/kernel/irq.c
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@@ -298,41 +298,29 @@ EXPORT_SYMBOL_GPL(kvm_set_posted_intr_wakeup_handler);
/*
* Handler for POSTED_INTERRUPT_VECTOR.
*/
__visible void smp_kvm_posted_intr_ipi(struct pt_regs *regs)
DEFINE_IDTENTRY_SYSVEC_SIMPLE(sysvec_kvm_posted_intr_ipi)
{
struct pt_regs *old_regs = set_irq_regs(regs);
entering_ack_irq();
ack_APIC_irq();
inc_irq_stat(kvm_posted_intr_ipis);
exiting_irq();
set_irq_regs(old_regs);
}
/*
* Handler for POSTED_INTERRUPT_WAKEUP_VECTOR.
*/
__visible void smp_kvm_posted_intr_wakeup_ipi(struct pt_regs *regs)
DEFINE_IDTENTRY_SYSVEC(sysvec_kvm_posted_intr_wakeup_ipi)
{
struct pt_regs *old_regs = set_irq_regs(regs);
entering_ack_irq();
ack_APIC_irq();
inc_irq_stat(kvm_posted_intr_wakeup_ipis);
kvm_posted_intr_wakeup_handler();
exiting_irq();
set_irq_regs(old_regs);
}
/*
* Handler for POSTED_INTERRUPT_NESTED_VECTOR.
*/
__visible void smp_kvm_posted_intr_nested_ipi(struct pt_regs *regs)
DEFINE_IDTENTRY_SYSVEC_SIMPLE(sysvec_kvm_posted_intr_nested_ipi)
{
struct pt_regs *old_regs = set_irq_regs(regs);
entering_ack_irq();
ack_APIC_irq();
inc_irq_stat(kvm_posted_intr_nested_ipis);
exiting_irq();
set_irq_regs(old_regs);
}
#endif