From: Paolo Bonzini <pbonzini@redhat.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Lai Jiangshan <jiangshanlai@gmail.com>,
linux-kernel@vger.kernel.org
Cc: Lai Jiangshan <laijs@linux.alibaba.com>,
Sean Christopherson <seanjc@google.com>,
Steven Rostedt <rostedt@goodmis.org>,
Andi Kleen <ak@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, Josh Poimboeuf <jpoimboe@redhat.com>,
Uros Bizjak <ubizjak@gmail.com>,
Maxim Levitsky <mlevitsk@redhat.com>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 3/4] KVM/VMX: Invoke NMI non-IST entry instead of IST entry
Date: Tue, 4 May 2021 10:10:42 +0200 [thread overview]
Message-ID: <baa499a7-2b63-2970-04a6-e2c68796adc7@redhat.com> (raw)
In-Reply-To: <87eeenk2l5.ffs@nanos.tec.linutronix.de>
On 03/05/21 22:02, Thomas Gleixner wrote:
> but this and the next patch are not really needed. The below avoids the
> extra kvm_before/after() dance in both places. Hmm?
Sure, that's good as well.
Paolo
> Thanks,
>
> tglx
> ---
> --- a/arch/x86/kernel/nmi.c
> +++ b/arch/x86/kernel/nmi.c
> @@ -526,6 +526,10 @@ DEFINE_IDTENTRY_RAW(exc_nmi)
>
> DEFINE_IDTENTRY_RAW_ALIAS(exc_nmi, exc_nmi_noist);
>
> +#if IS_MODULE(CONFIG_KVM_INTEL)
> +EXPORT_SYMBOL_GPL(asm_exc_nmi_noist);
> +#endif
> +
> void stop_nmi(void)
> {
> ignore_nmis++;
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -36,6 +36,7 @@
> #include <asm/debugreg.h>
> #include <asm/desc.h>
> #include <asm/fpu/internal.h>
> +#include <asm/idtentry.h>
> #include <asm/io.h>
> #include <asm/irq_remapping.h>
> #include <asm/kexec.h>
> @@ -6395,18 +6396,17 @@ static void vmx_apicv_post_state_restore
>
> void vmx_do_interrupt_nmi_irqoff(unsigned long entry);
>
> -static void handle_interrupt_nmi_irqoff(struct kvm_vcpu *vcpu, u32 intr_info)
> +static void handle_interrupt_nmi_irqoff(struct kvm_vcpu *vcpu,
> + unsigned long entry)
> {
> - unsigned int vector = intr_info & INTR_INFO_VECTOR_MASK;
> - gate_desc *desc = (gate_desc *)host_idt_base + vector;
> -
> kvm_before_interrupt(vcpu);
> - vmx_do_interrupt_nmi_irqoff(gate_offset(desc));
> + vmx_do_interrupt_nmi_irqoff(entry);
> kvm_after_interrupt(vcpu);
> }
>
> static void handle_exception_nmi_irqoff(struct vcpu_vmx *vmx)
> {
> + const unsigned long nmi_entry = (unsigned long)asm_exc_nmi_noist;
> u32 intr_info = vmx_get_intr_info(&vmx->vcpu);
>
> /* if exit due to PF check for async PF */
> @@ -6417,18 +6417,20 @@ static void handle_exception_nmi_irqoff(
> kvm_machine_check();
> /* We need to handle NMIs before interrupts are enabled */
> else if (is_nmi(intr_info))
> - handle_interrupt_nmi_irqoff(&vmx->vcpu, intr_info);
> + handle_interrupt_nmi_irqoff(&vmx->vcpu, nmi_entry);
> }
>
> static void handle_external_interrupt_irqoff(struct kvm_vcpu *vcpu)
> {
> u32 intr_info = vmx_get_intr_info(vcpu);
> + unsigned int vector = intr_info & INTR_INFO_VECTOR_MASK;
> + gate_desc *desc = (gate_desc *)host_idt_base + vector;
>
> if (WARN_ONCE(!is_external_intr(intr_info),
> "KVM: unexpected VM-Exit interrupt info: 0x%x", intr_info))
> return;
>
> - handle_interrupt_nmi_irqoff(vcpu, intr_info);
> + handle_interrupt_nmi_irqoff(vcpu, gate_offset(desc));
> }
>
> static void vmx_handle_exit_irqoff(struct kvm_vcpu *vcpu)
next prev parent reply other threads:[~2021-05-04 8:10 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-26 23:09 [PATCH 0/4] x86: Don't invoke asm_exc_nmi() on the kernel stack Lai Jiangshan
2021-04-26 23:09 ` [PATCH 1/4] x86/xen/entry: Rename xenpv_exc_nmi to noist_exc_nmi Lai Jiangshan
2021-04-28 21:27 ` Steven Rostedt
2021-04-30 7:15 ` Paolo Bonzini
2021-04-30 12:05 ` Steven Rostedt
2021-05-03 19:05 ` Thomas Gleixner
2021-05-03 19:41 ` Thomas Gleixner
2021-05-10 7:59 ` Juergen Gross
2021-04-26 23:09 ` [PATCH 2/4] x86/entry: Use asm_noist_exc_nmi() for NMI in early booting stage Lai Jiangshan
2021-04-28 21:30 ` Steven Rostedt
2021-05-03 20:13 ` Thomas Gleixner
2021-05-03 20:24 ` Thomas Gleixner
2021-05-03 21:45 ` Thomas Gleixner
2021-05-04 12:43 ` Thomas Gleixner
2021-05-04 19:50 ` [PATCH] KVM/VMX: Invoke NMI non-IST entry instead of IST entry Thomas Gleixner
2021-05-04 21:05 ` Maxim Levitsky
2021-05-04 21:12 ` Paolo Bonzini
2021-05-04 21:21 ` Sean Christopherson
2021-05-04 21:23 ` Andy Lutomirski
2021-05-04 21:25 ` Paolo Bonzini
2021-05-04 21:51 ` Sean Christopherson
2021-05-04 21:56 ` Paolo Bonzini
2021-05-05 0:00 ` Thomas Gleixner
2021-05-05 15:44 ` Lai Jiangshan
2021-05-05 1:07 ` Lai Jiangshan
2021-05-05 1:11 ` Andy Lutomirski
2021-05-06 12:14 ` [tip: x86/urgent] " tip-bot2 for Lai Jiangshan
2021-04-26 23:09 ` [PATCH 3/4] " Lai Jiangshan
2021-04-30 2:46 ` Lai Jiangshan
2021-05-03 19:37 ` Thomas Gleixner
2021-05-03 20:02 ` Thomas Gleixner
2021-05-04 8:10 ` Paolo Bonzini [this message]
2021-04-26 23:09 ` [PATCH 4/4] KVM/VMX: Fold handle_interrupt_nmi_irqoff() into its solo caller Lai Jiangshan
2021-04-30 9:03 ` Thomas Gleixner
2021-04-30 9:06 ` Paolo Bonzini
2021-04-30 23:28 ` Thomas Gleixner
2021-04-30 7:14 ` [PATCH 0/4] x86: Don't invoke asm_exc_nmi() on the kernel stack Paolo Bonzini
2021-05-03 14:36 ` Thomas Gleixner
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