linux-kernel - Re: [PATCH 4/4] KVM: ioapic: reinject pending interrupts on KVM_SET

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <532861EF.8050001@siemens.com>
Date:	Tue, 18 Mar 2014 16:10:39 +0100
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org
CC:	gleb@...nel.org, mtosatti@...hat.com, kvm@...r.kernel.org
Subject: Re: [PATCH 4/4] KVM: ioapic: reinject pending interrupts on KVM_SET_IRQCHIP

On 2014-03-18 15:54, Paolo Bonzini wrote:
> After the previous patches, an interrupt whose bit is set in the IRR
> register will never be in the LAPIC's IRR and has never been injected
> on the migration source.  So inject it on the destination.
> 
> This fixes migration of Windows guests without HPET (they use the RTC
> to trigger the scheduler tick, and lose it after migration).
> 
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
>  virt/kvm/ioapic.c | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
> index 7a573f1bb79e..63fb432ab502 100644
> --- a/virt/kvm/ioapic.c
> +++ b/virt/kvm/ioapic.c
> @@ -201,6 +201,19 @@ out:
>  	return ret;
>  }
>  
> +void kvm_ioapic_inject_all(struct kvm_ioapic *ioapic, unsigned long irr)

static? (Didn't the compiler bark at you?)

Jan

> +{
> +	u32 idx;
> +
> +	rtc_irq_eoi_tracking_reset(ioapic);
> +	for_each_set_bit(idx, &irr, 32) {
> +		printk("ioapic_service for GSI %d\n", idx);
> +		ioapic_set_irq(ioapic, idx, 1, true);
> +	}
> +	kvm_rtc_eoi_tracking_restore_all(ioapic);
> +}
> +
> +
>  static void update_handled_vectors(struct kvm_ioapic *ioapic)
>  {
>  	DECLARE_BITMAP(handled_vectors, 256);
> @@ -601,9 +614,10 @@ int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
>  
>  	spin_lock(&ioapic->lock);
>  	memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));
> +	ioapic->irr = 0;
>  	update_handled_vectors(ioapic);
>  	kvm_vcpu_request_scan_ioapic(kvm);
> -	kvm_rtc_eoi_tracking_restore_all(ioapic);
> +	kvm_ioapic_inject_all(ioapic, state->irr);
>  	spin_unlock(&ioapic->lock);
>  	return 0;
>  }
> 
-- 
Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/