linux-kernel - [PATCH v3 0/5] VMX Capability MSRs

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Date:   Tue, 29 Nov 2016 18:14:05 -0800
From:   David Matlack <dmatlack@...gle.com>
To:     kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, jmattson@...gle.com,
        rkrcmar@...hat.com, pbonzini@...hat.com,
        David Matlack <dmatlack@...gle.com>
Subject: [PATCH v3 0/5] VMX Capability MSRs

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