On Tue, Feb 03, 2015 at 11:58:17PM +0800, Wincy Van wrote: > If vcpu has a interrupt in vmx non-root mode, we will > kick that vcpu to inject interrupt timely. With posted > interrupt processing, the kick intr is not needed, and > interrupts are fully taken care of by hardware. > > In nested vmx, this feature avoids much more vmexits > than non-nested vmx. > > This patch use L0's POSTED_INTR_NV to avoid unexpected > interrupt if L1's vector is different with L0's. If vcpu > is in hardware's non-root mode, we use a physical ipi to > deliver posted interrupts, otherwise we will accomplish > that posted interrupt in nested vm-entry manually. > > Signed-off-by: Wincy Van <fanwenyi0529@xxxxxxxxx> > --- > arch/x86/kvm/lapic.c | 13 +++- > arch/x86/kvm/lapic.h | 1 + > arch/x86/kvm/vmx.c | 151 ++++++++++++++++++++++++++++++++++++++++++++++++- > 3 files changed, 158 insertions(+), 7 deletions(-) > Wincy, our QA found regressions with this patch that 64bit L2 linux guest fails to boot up when running nested kvm on kvm. Environment: ------------ Host OS (ia32/ia32e/IA64):ia32e Guest OS (ia32/ia32e/IA64):ia32e Guest OS Type (Linux/Windows):Linux kvm.git Commit:6557bada461afeaa920a189fae2cff7c8fdce39f qemu.kvm Commit:5c697ae74170d43928cb185f5ac1a9058adcae0b Host Kernel Version:3.19.0-rc3 Hardware:Ivytown_EP, Haswell_EP Bug detailed description: -------------------------- create 64bit linux guest as L2 guest, the guest boot up fail note: 1. create a 32bit linux guest as L2 guest, the guest boots up fine. 2. create a 64bit windows guest as L2 guest, the guest boots up fine. 3. this should be a kernel bug: kvm + qemu = result 6557bada + 5c697ae7 = bad 8fff5e37 + 5c697ae7 = good Reproduce steps: ---------------- 1 create L1 guest: qemu-system-x86_64 -enable-kvm -m 8G -smp 4 -net nic,macaddr=00:12:31:34:51:31 -net tap,script=/etc/kvm/qemu-ifup nested-kvm.qcow -cpu host 2. create L2 guest qemu-system-x86_64 -enable-kvm -m 2G -smp 2 -net none rhel6u5.qcow Current result: ---------------- create 64bit linux guest as L2 guest, the guest boots up fail Expected result: ---------------- create 64bit linux guest as L2 guest, the guest boots up fine Please take a look. Thanks -Yong -- 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
