> From: Nadav Har'El > Sent: Thursday, May 26, 2011 4:01 AM > > Hi, > > This is the eleventh iteration of the nested VMX patch set, and hopefully the > last in this format. > > Improvements in this version over the previous one include: > > * Overhauled vmcs, cpu, and launched handling (new loaded_vmcs structure > and > per-cpu linked-list replacing old vcpu linked-list). > > * Added missing checks that VMPTRLD was done, in emulating VMLAUNCH > and some > other VMX instructions. > > * prepare_vmcs02 is now void, and cannot fail. Correctly handle the case > of apic-access page with an invalid GPA. > > * A bunch of corrections to errors and omissions discovered by Kevin Tian. > > * Miscellenous function name changes, and other cosmetic improvements. > > This new set of patches applies to the current KVM trunk (I checked with > 5b186b275c0288c8576d26baebe9019875d68a2b). > > Avi, please apply. This version looks good to me, except that please make sure unhandled comments are recorded in your private bugzilla and finally filled into a public place. :-) Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx> Thanks Kevin > > Nadav. > > > About nested VMX: > ----------------- > > The following 31 patches implement nested VMX support. This feature enables > a guest to use the VMX APIs in order to run its own nested guests. > In other words, it allows running hypervisors (that use VMX) under KVM. > Multiple guest hypervisors can be run concurrently, and each of those can > in turn host multiple guests. > > The theory behind this work, our implementation, and its performance > characteristics were presented in OSDI 2010 (the USENIX Symposium on > Operating Systems Design and Implementation). Our paper was titled > "The Turtles Project: Design and Implementation of Nested Virtualization", > and was awarded "Jay Lepreau Best Paper". The paper is available online, at: > > http://www.usenix.org/events/osdi10/tech/full_papers/Ben-Yehuda.pdf > > This patch set does not include all the features described in the paper. > In particular, this patch set is missing nested EPT (L1 can't use EPT and > must use shadow page tables). It is also missing some features required to > run VMWare hypervisors as a guest. These missing features will be sent as > follow-on patchs. > > Running nested VMX: > ------------------ > > The nested VMX feature is currently disabled by default. It must be > explicitly enabled with the "nested=1" option to the kvm-intel module. > > No modifications are required to user space (qemu). However, qemu's default > emulated CPU type (qemu64) does not list the "VMX" CPU feature, so it must > be > explicitly enabled, by giving qemu one of the following options: > > -cpu host (emulated CPU has all features of the real > CPU) > > -cpu qemu64,+vmx (add just the vmx feature to a named CPU > type) > > > This version was only tested with KVM (64-bit) as a guest hypervisor, and > Linux as a nested guest. > > > Patch statistics: > ----------------- > > Documentation/kvm/nested-vmx.txt | 251 ++ > arch/x86/include/asm/kvm_host.h | 2 > arch/x86/include/asm/msr-index.h | 12 > arch/x86/include/asm/vmx.h | 43 > arch/x86/kvm/svm.c | 6 > arch/x86/kvm/vmx.c | 2733 > +++++++++++++++++++++++++++-- > arch/x86/kvm/x86.c | 11 > arch/x86/kvm/x86.h | 8 > 8 files changed, 2907 insertions(+), 159 deletions(-) > > -- > Nadav Har'El > IBM Haifa Research Lab > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
