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Message-ID: <SA1PR11MB6734110197BD5B5887917338A8FE9@SA1PR11MB6734.namprd11.prod.outlook.com>
Date: Mon, 9 Jan 2023 18:20:51 +0000
From: "Li, Xin3" <xin3.li@...el.com>
To: "Li, Xin3" <xin3.li@...el.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"x86@...nel.org" <x86@...nel.org>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>
CC: "tglx@...utronix.de" <tglx@...utronix.de>,
"mingo@...hat.com" <mingo@...hat.com>,
"bp@...en8.de" <bp@...en8.de>,
"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
"hpa@...or.com" <hpa@...or.com>,
"peterz@...radead.org" <peterz@...radead.org>,
"andrew.cooper3@...rix.com" <andrew.cooper3@...rix.com>,
"Christopherson,, Sean" <seanjc@...gle.com>,
"pbonzini@...hat.com" <pbonzini@...hat.com>,
"Shankar, Ravi V" <ravi.v.shankar@...el.com>
Subject: RE: [RFC PATCH 05/32] x86/traps: add exc_raise_irq() for VMX IRQ
reinjection
> diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
> index 46f5e4e2a346..366b1675c033 100644
> --- a/arch/x86/include/asm/traps.h
> +++ b/arch/x86/include/asm/traps.h
> @@ -56,4 +56,6 @@ void __noreturn handle_stack_overflow(struct pt_regs
> *regs,
> void f (struct pt_regs *regs)
> typedef DECLARE_SYSTEM_INTERRUPT_HANDLER((*system_interrupt_handler));
>
> +int exc_raise_irq(struct pt_regs *regs, u32 vector);
> +
> #endif /* _ASM_X86_TRAPS_H */
> diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
> index c35dd2b4d146..99386836b02e 100644
> --- a/arch/x86/kernel/traps.c
> +++ b/arch/x86/kernel/traps.c
> @@ -1536,6 +1536,24 @@ int external_interrupt(struct pt_regs *regs, unsigned
> int vector)
> return 0;
> }
>
> +#if IS_ENABLED(CONFIG_KVM_INTEL)
> +/*
> + * KVM VMX reinjects IRQ on its current stack, it's a sync call
> + * thus the values in the pt_regs structure are not used in
> + * executing IRQ handlers, except cs.RPL and flags.IF, which
> + * are both always 0 in the VMX IRQ reinjection context.
> + *
> + * However, the pt_regs structure is sometimes used in stack
> + * dump, e.g., show_regs(). So let the caller, i.e., KVM VMX
> + * decide how to initialize the input pt_regs structure.
> + */
> +int exc_raise_irq(struct pt_regs *regs, u32 vector)
> +{
> + return external_interrupt(regs, vector);
> +}
> +EXPORT_SYMBOL_GPL(exc_raise_irq);
> +#endif
Maybe it's better to simply export external_interrupt()
+EXPORT_SYMBOL_GPL(external_interrupt);
Then I don't need to add exc_raise_irq().
> +
> void __init trap_init(void)
> {
> /* Init cpu_entry_area before IST entries are set up */
> --
> 2.34.1
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