linux-kernel - [PATCH v5 0/4] KVM: nSVM: ondemand nested state allocation

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Message-Id: <20200921131923.120833-1-mlevitsk@redhat.com>
Date:   Mon, 21 Sep 2020 16:19:19 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Joerg Roedel <joro@...tes.org>,
        Ingo Molnar <mingo@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
        Wanpeng Li <wanpengli@...cent.com>,
        Borislav Petkov <bp@...en8.de>,
        Jim Mattson <jmattson@...gle.com>,
        linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH v5 0/4] KVM: nSVM: ondemand nested state allocation

This is yet another version of ondemand nested state allocation.

In this version I adoped the suggestion of Sean Christopherson
to return make EFER write return a negative error which then should
propogate to the userspace.

So I fixed the WRMSR code to actually obey this (#GP on positive
return value, exit to userspace when negative error value,
and success on 0 error value, and fixed one user (xen)
that returned negative error code on failures.

The XEN patch is only compile tested. The rest were tested
by always returning -ENOMEM from svm_allocate_nested.

Best regards,
	Maxim Levitsky

Maxim Levitsky (4):
  KVM: x86: xen_hvm_config cleanup return values
  KVM: x86: report negative values from wrmsr to userspace
  KVM: x86: allow kvm_x86_ops.set_efer to return a value
  KVM: nSVM: implement ondemand allocation of the nested state

 arch/x86/include/asm/kvm_host.h |  2 +-
 arch/x86/kvm/emulate.c          |  7 ++--
 arch/x86/kvm/svm/nested.c       | 42 ++++++++++++++++++++++++
 arch/x86/kvm/svm/svm.c          | 58 +++++++++++++++++++--------------
 arch/x86/kvm/svm/svm.h          |  8 ++++-
 arch/x86/kvm/vmx/vmx.c          |  9 +++--
 arch/x86/kvm/x86.c              | 36 ++++++++++----------
 7 files changed, 113 insertions(+), 49 deletions(-)

-- 
2.26.2