Re: [PATCH v12 0/3] x86, apicv: Add APIC virtualization support

[Marcelo Tosatti <mtosatti@redhat.com>]

On Wed, Jan 23, 2013 at 10:47:23PM +0800, Yang Zhang wrote:
> From: Yang Zhang <yang.z.zhang@Intel.com>
> 
> APIC virtualization is a new feature which can eliminate most of VM exit
> when vcpu handle a interrupt:
> 
> APIC register virtualization:
>         APIC read access doesn't cause APIC-access VM exits.
>         APIC write becomes trap-like.
> 
> Virtual interrupt delivery:
>         Virtual interrupt delivery avoids KVM to inject vAPIC interrupts
>         manually, which is fully taken care of by the hardware.
> 
> Please refer to Intel SDM volume 3, chapter 29 for more details.
> Changes v11 to v12:
>  * Check irqchip in kernel when enabling apicv, if using userspace irq chip,
>    apicv cannot be used and must be disabled.
>  * Rename some fucntion to more descriptive name.
>  * Move ioapic entry pase logic to lapic.c
>  * Rebased on top of KVM upstream
> 
> Changes v10 to v11:
>  * Use two new msr bitmaps for guest that enabling x2apic mode:
>    Since msr bitmap is shared by all guests, it will break guest that
>    not using x2apic when updating the global msr bitmap. To solve this,
>    we use two new msr bitmap for guest which using x2apic.
> 
> Changes v9 to v10:
>  * Enable virtualize x2apic mode when guest is using x2apic and apicv:
>    There is no point to enable x2apic mode when apicv is disabled.
>  * Grep ioapic_lock when traversing ioapic entry to set eoi exit bitmap
>  * Rebased on top of KVM upstream
> 
> Changes v8 to v9:
>  * Update eoi exit bitmap by vcpu itself.
>  * Enable virtualize x2apic mode when guest is using x2apic.
>  * Rebase on top of KVM upstream
> 
> Changes v7 to v8:
>  * According Marcelo's suggestion, add comments for irr_pending and isr_count,
>    since the two valiables have different meaning when using apicv.
>  * Set highest bit in vISR to SVI after migation.
>  * Use spinlock to access eoi exit bitmap synchronously.
>  * Enable virtualize x2apic mode when guest is using x2apic
>  * Rebased on top of KVM upstream.
> 
> Yang Zhang (3):
>   x86, apicv: add APICv register virtualization support
>   x86, apicv: add virtual x2apic support
>   x86, apicv: add virtual interrupt delivery support
> 
>  arch/ia64/kvm/lapic.h           |    6 +
>  arch/x86/include/asm/kvm_host.h |    8 +
>  arch/x86/include/asm/vmx.h      |   14 ++
>  arch/x86/kvm/irq.c              |   56 ++++++-
>  arch/x86/kvm/lapic.c            |  135 ++++++++++++---
>  arch/x86/kvm/lapic.h            |   29 ++++
>  arch/x86/kvm/svm.c              |   37 ++++
>  arch/x86/kvm/vmx.c              |  349 ++++++++++++++++++++++++++++++++++++---
>  arch/x86/kvm/x86.c              |   11 +-
>  include/linux/kvm_host.h        |    3 +
>  virt/kvm/ioapic.c               |   39 +++++
>  virt/kvm/ioapic.h               |    4 +
>  virt/kvm/irq_comm.c             |   25 +++
>  virt/kvm/kvm_main.c             |    5 +
>  14 files changed, 667 insertions(+), 54 deletions(-)

Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>