linux-kernel - RE: [PATCH v4 33/34] KVM: x86/vmx: call external_interrupt() for IRQ reinjection when FRED is enabled

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Date:   Mon, 6 Mar 2023 09:32:35 +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: [PATCH v4 33/34] KVM: x86/vmx: call external_interrupt() for IRQ
 reinjection when FRED is enabled


>  arch/x86/kvm/vmx/vmx.c | 22 +++++++++++++++++++++-
>  1 file changed, 21 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index
> bcac3efcde41..30f854015c8c 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -47,6 +47,7 @@
>  #include <asm/mshyperv.h>
>  #include <asm/mwait.h>
>  #include <asm/spec-ctrl.h>
> +#include <asm/traps.h>
>  #include <asm/virtext.h>
>  #include <asm/vmx.h>
> 
> @@ -6923,7 +6924,26 @@ static void handle_external_interrupt_irqoff(struct
> kvm_vcpu *vcpu)
>  		return;
> 
>  	kvm_before_interrupt(vcpu, KVM_HANDLING_IRQ);
> -	vmx_do_interrupt_irqoff(gate_offset(desc));
> +	if (cpu_feature_enabled(X86_FEATURE_FRED)) {
> +		struct vcpu_vmx *vmx = to_vmx(vcpu);
> +		struct pt_regs regs = {};
> +
> +		/*
> +		 * Create an event return stack frame with the
> +		 * host context immediately after a VM exit.
> +		 *
> +		 * All other fields of the pt_regs structure are
> +		 * cleared to 0.
> +		 */
> +		regs.ssx	= __KERNEL_DS;

This breaks i386 build, and should use ss.

> +		regs.sp		= vmx->loaded_vmcs->host_state.rsp;
> +		regs.flags	= X86_EFLAGS_FIXED;
> +		regs.csx	= __KERNEL_CS;

And cs.

> +		regs.ip		= (unsigned long)vmx_vmexit;
> +
> +		external_interrupt(&regs, vector);
> +	} else
> +		vmx_do_interrupt_irqoff(gate_offset(desc));
>  	kvm_after_interrupt(vcpu);
> 
>  	vcpu->arch.at_instruction_boundary = true;
> --
> 2.34.1