RE: [PATCH v5 00/12] SVM cleanup and INVPCID feature support

[Babu Moger <babu.moger@amd.com>]

Hi Paolo,
Let me know if you have feedback on this series? I was thinking of
refreshing the series. There is one minor comment on PATCH v5 04/12(from Jim).
Thanks
Babu

> -----Original Message-----
> From: Moger, Babu <Babu.Moger@amd.com>
> Sent: Wednesday, August 26, 2020 2:14 PM
> To: pbonzini@redhat.com; vkuznets@redhat.com;
> sean.j.christopherson@intel.com; jmattson@google.com
> Cc: wanpengli@tencent.com; kvm@vger.kernel.org; joro@8bytes.org;
> x86@kernel.org; linux-kernel@vger.kernel.org; Moger, Babu
> <Babu.Moger@amd.com>; mingo@redhat.com; bp@alien8.de;
> hpa@zytor.com; tglx@linutronix.de
> Subject: [PATCH v5 00/12] SVM cleanup and INVPCID feature support
> 
> The following series adds the support for PCID/INVPCID on AMD guests.
> While doing it re-structured the vmcb_control_area data structure to combine
> all the intercept vectors into one 32 bit array. Makes it easy for future additions.
> Re-arranged few pcid related code to make it common between SVM and VMX.
> 
> INVPCID interceptions are added only when the guest is running with shadow
> page table enabled. In this case the hypervisor needs to handle the tlbflush
> based on the type of invpcid instruction.
> 
> For the guests with nested page table (NPT) support, the INVPCID feature works
> as running it natively. KVM does not need to do any special handling.
> 
> AMD documentation for INVPCID feature is available at "AMD64 Architecture
> Programmer’s Manual Volume 2: System Programming, Pub. 24593 Rev. 3.34(or
> later)"
> 
> The documentation can be obtained at the links below:
> Link: https://www.amd.com/system/files/TechDocs/24593.pdf
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537
> ---
> v5:
>  All the changes are related to rebase.
>  Aplies cleanly on mainline and kvm(master) tree.
>  Resending it to get some attention.
> 
> v4:
> 
> https://lore.kernel.org/lkml/159676101387.12805.18038347880482984693.stgi
> t@bmoger-ubuntu/
>  1. Changed the functions __set_intercept/__clr_intercept/__is_intercept to
>     to vmcb_set_intercept/vmcb_clr_intercept/vmcb_is_intercept by passing
>     vmcb_control_area structure(Suggested by Paolo).
>  2. Rearranged the commit 7a35e515a7055 ("KVM: VMX: Properly handle
> kvm_read/write_guest_virt*())
>     to make it common across both SVM/VMX(Suggested by Jim Mattson).
>  3. Took care of few other comments from Jim Mattson. Dropped "Reviewed-
> by"
>     on few patches which I have changed since v3.
> 
> v3:
> 
> https://lore.kernel.org/lkml/159597929496.12744.14654593948763926416.stgi
> t@bmoger-ubuntu/
>  1. Addressing the comments from Jim Mattson. Follow the v2 link below
>     for the context.
>  2. Introduced the generic __set_intercept, __clr_intercept and is_intercept
>     using native __set_bit, clear_bit and test_bit.
>  3. Combined all the intercepts vectors into single 32 bit array.
>  4. Removed set_intercept_cr, clr_intercept_cr, set_exception_intercepts,
>     clr_exception_intercept etc. Used the generic set_intercept and
>     clr_intercept where applicable.
>  5. Tested both L1 guest and l2 nested guests.
> 
> v2:
> 
> https://lore.kernel.org/lkml/159234483706.6230.13753828995249423191.stgit
> @bmoger-ubuntu/
>   - Taken care of few comments from Jim Mattson.
>   - KVM interceptions added only when tdp is off. No interceptions
>     when tdp is on.
>   - Reverted the fault priority to original order in VMX.
> 
> v1:
> 
> https://lore.kernel.org/lkml/159191202523.31436.11959784252237488867.stgi
> t@bmoger-ubuntu/
> 
> Babu Moger (12):
>       KVM: SVM: Introduce vmcb_(set_intercept/clr_intercept/_is_intercept)
>       KVM: SVM: Change intercept_cr to generic intercepts
>       KVM: SVM: Change intercept_dr to generic intercepts
>       KVM: SVM: Modify intercept_exceptions to generic intercepts
>       KVM: SVM: Modify 64 bit intercept field to two 32 bit vectors
>       KVM: SVM: Add new intercept vector in vmcb_control_area
>       KVM: nSVM: Cleanup nested_state data structure
>       KVM: SVM: Remove set_cr_intercept, clr_cr_intercept and is_cr_intercept
>       KVM: SVM: Remove set_exception_intercept and clr_exception_intercept
>       KVM: X86: Rename and move the function vmx_handle_memory_failure to
> x86.c
>       KVM: X86: Move handling of INVPCID types to x86
>       KVM:SVM: Enable INVPCID feature on AMD
> 
> 
>  arch/x86/include/asm/svm.h      |  117 +++++++++++++++++++++++++----------
>  arch/x86/include/uapi/asm/svm.h |    2 +
>  arch/x86/kvm/svm/nested.c       |   66 +++++++++-----------
>  arch/x86/kvm/svm/svm.c          |  131 ++++++++++++++++++++++++++------------
> -
>  arch/x86/kvm/svm/svm.h          |   87 +++++++++-----------------
>  arch/x86/kvm/trace.h            |   21 ++++--
>  arch/x86/kvm/vmx/nested.c       |   12 ++--
>  arch/x86/kvm/vmx/vmx.c          |   95 ----------------------------
>  arch/x86/kvm/vmx/vmx.h          |    2 -
>  arch/x86/kvm/x86.c              |  106 ++++++++++++++++++++++++++++++++
>  arch/x86/kvm/x86.h              |    3 +
>  11 files changed, 364 insertions(+), 278 deletions(-)
> 
> --
> Signature