Re: [RFC PATCH 00/18] KVM: x86: CPU isolation and direct interrupts handling by guests

Tomoki Sekiyama
2012-07-04T09:33:31Z

Hello,

There were some missing pieces for trying this patch series.

Firstly, the patch is for v3.5-rc4, but that version has an issue
that it cannot passthrough PCI devices because of genirq changes.
A patch to avoid this issue is available at
https://lkml.org/lkml/2012/6/1/261 .

Secondly, to successfully build the patched qemu-kvm, you need the
following additional definitions to qemu-kvm's header files for KVM.

diff -u -r qemu-kvm-0.15.1/linux-headers/linux/kvm.h qemu-kvm-0.15.1-test/linux-headers/linux/kvm.h
--- qemu-kvm-0.15.1/linux-headers/linux/kvm.h 2011-10-19 22:54:48.000000000 +0900
+++ qemu-kvm-0.15.1-test/linux-headers/linux/kvm.h 2012-06-25 21:21:20.273488167 +0900
@@ -544,6 +544,7 @@
#define KVM_CAP_TSC_CONTROL 60
#define KVM_CAP_GET_TSC_KHZ 61
#define KVM_CAP_PPC_BOOKE_SREGS 62
+#define KVM_CAP_SLAVE_CPU 80

#ifdef KVM_CAP_IRQ_ROUTING

@@ -746,6 +747,9 @@
/* Available with KVM_CAP_XCRS */
#define KVM_GET_XCRS _IOR(KVMIO, 0xa6, struct kvm_xcrs)
#define KVM_SET_XCRS _IOW(KVMIO, 0xa7, struct kvm_xcrs)
+/* Available with KVM_CAP_SLAVE_CPU */
+#define KVM_GET_SLAVE_CPU _IO(KVMIO, 0xae)
+#define KVM_SET_SLAVE_CPU _IO(KVMIO, 0xaf)

#define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0)

Thanks,
--
Tomoki Sekiyama <tomoki.sekiyama.qu@hitachi.com>
Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory