This patchset adds support setting the VMX capability MSRs from userspace.
This is required for migration of nested-capable VMs to different CPUs and
KVM versions.
Patch 1 generates the non-true VMX MSRs using the true MSRs, which allows
userspace to skip restoring them.
Patch 2 adds support for restoring the VMX capability MSRs.
Patches 3 and 4 make KVM's emulation of MSR_IA32_VMX_CR{0,4}_FIXED1 more
accurate.
Patch 5 fixes a bug in emulated VM-entry that came up when testing patches
3 and 4.
Changes since v2:
* Generate CR0_FIXED1 in addition to CR4_FIXED1
* Generate "non-true" capability MSRs from the "true" versions and remove
"non-true" MSRs from struct nested_vmx.
* Disallow restore of CR{0,4}_FIXED1 and "non-true" MSRs since they are
generated.
Changes since v1:
* Support restoring less-capable versions of MSR_IA32_VMX_BASIC,
MSR_IA32_VMX_CR{0,4}_FIXED{0,1}.
* Include VMX_INS_OUTS in MSR_IA32_VMX_BASIC initial value.
David Matlack (5):
KVM: nVMX: generate non-true VMX MSRs based on true versions
KVM: nVMX: support restore of VMX capability MSRs
KVM: nVMX: fix checks on CR{0,4} during virtual VMX operation
KVM: nVMX: generate MSR_IA32_CR{0,4}_FIXED1 from guest CPUID
KVM: nVMX: load GUEST_EFER after GUEST_CR0 during emulated VM-entry
arch/x86/include/asm/vmx.h | 31 +++
arch/x86/kvm/vmx.c | 479 +++++++++++++++++++++++++++++++++++++--------
2 files changed, 427 insertions(+), 83 deletions(-)
--
2.8.0.rc3.226.g39d4020
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