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

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Message-ID: <7aad1d11-ef44-9d11-e7b5-c46f84aac5e5@redhat.com>
Date:   Wed, 30 Nov 2016 12:22:00 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     David Matlack <dmatlack@...gle.com>, kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, jmattson@...gle.com,
        rkrcmar@...hat.com
Subject: Re: [PATCH v3 0/5] VMX Capability MSRs



On 30/11/2016 03:14, David Matlack wrote:
> 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(-)

Just a small nit that can be fixed on applying.  Thanks!

Paolo