linux-kernel - RE: [PATCH 1/5] KVM: nVMX: Make nested control MSRs per-cpu.

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Date:	Wed, 21 Jan 2015 08:18:57 +0000
From:	"Zhang, Yang Z" <yang.z.zhang@...el.com>
To:	Wincy Van <fanwenyi0529@...il.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	"gleb@...nel.org" <gleb@...nel.org>
CC:	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Wanpeng Li <wanpeng.li@...ux.intel.com>,
	Jan Kiszka <jan.kiszka@....de>
Subject: RE: [PATCH 1/5] KVM: nVMX: Make nested control MSRs per-cpu.

Wincy Van wrote on 2015-01-16:
> To enable nested apicv support, we need per-cpu vmx control MSRs:
>   1. If in-kernel irqchip is enabled, we can enable nested
>      posted interrupt, we should set posted intr bit in the
>      nested_vmx_pinbased_ctls_high. 2. If in-kernel irqchip is disabled,
>      we can not enable nested posted interrupt, the posted intr bit in
>      the nested_vmx_pinbased_ctls_high will be cleared.
> Since there would be different settings about in-kernel irqchip
> between VMs, different nested control MSRs are needed.

I'd suggest you to check irqchip_in_kernel() instead moving the whole ctrl msr to per vcpu.

Best regards,
Yang