On Fri, Jan 25, 2013 at 10:18:48AM +0800, Yang Zhang wrote:
> From: Yang Zhang <yang.z.zhang@xxxxxxxxx>
>
> 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.
>
> The first patch adds APIC register virtualization supporting.
> The second patch adds virtual x2apic mode supporting since it is required by APICv when guest uses msr based way to access APIC.
> The third patch adds virtual interrupt delivery supporting.
>
> Please refer to Intel SDM volume 3, chapter 29 for more details.
> Changes v12 to v13:
> * Remove unnecessary check when set virtualized apic access
> * Use vm_need_tpr_shadow() instead read vmcs to check tpr.
> * Check irqchip_in_kernel when set msr bitmap.
> * Correct comment format
> * Remove unnecessary callback when set eoi exit bitmap.
> * Disable vid when irqchip is in userspace.
> * Rename vmx_vcpu_has_apicv to vmx_vm_has_apicv.
> * Rebased on top of KVM upstream
>
> 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 | 6 +
> arch/x86/include/asm/vmx.h | 14 ++
> arch/x86/kvm/irq.c | 56 ++++++-
> arch/x86/kvm/lapic.c | 140 +++++++++++++----
> arch/x86/kvm/lapic.h | 34 ++++
> arch/x86/kvm/svm.c | 24 +++
> arch/x86/kvm/vmx.c | 327 ++++++++++++++++++++++++++++++++++++---
> arch/x86/kvm/x86.c | 23 +++-
> 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, 647 insertions(+), 59 deletions(-)
Reviewed-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
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