linux-kernel - [PATCH v3 00/13] SMM emulation and interrupt shadow fixes

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Date:   Wed,  3 Aug 2022 18:49:58 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-kernel@...r.kernel.org, Wanpeng Li <wanpengli@...cent.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>, x86@...nel.org,
        Jim Mattson <jmattson@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, Joerg Roedel <joro@...tes.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH v3 00/13] SMM emulation and interrupt shadow fixes

This patch series is a result of long debug work to find out why
sometimes guests with win11 secure boot
were failing during boot.

During writing a unit test I found another bug, turns out
that on rsm emulation, if the rsm instruction was done in real
or 32 bit mode, KVM would truncate the restored RIP to 32 bit.

I also refactored the way we write SMRAM so it is easier
now to understand what is going on.

The main bug in this series which I fixed is that we
allowed #SMI to happen during the STI interrupt shadow,
and we did nothing to both reset it on #SMI handler
entry and restore it on RSM.

V3: addressed most of the review feedback from Sean (thanks!)

Best regards,
	Maxim Levitsky

Maxim Levitsky (13):
  bug: introduce ASSERT_STRUCT_OFFSET
  KVM: x86: emulator: em_sysexit should update ctxt->mode
  KVM: x86: emulator: introduce emulator_recalc_and_set_mode
  KVM: x86: emulator: update the emulation mode after rsm
  KVM: x86: emulator: update the emulation mode after CR0 write
  KVM: x86: emulator/smm: number of GPRs in the SMRAM image depends on
    the image format
  KVM: x86: emulator/smm: add structs for KVM's smram layout
  KVM: x86: emulator/smm: use smram structs in the common code
  KVM: x86: emulator/smm: use smram struct for 32 bit smram load/restore
  KVM: x86: emulator/smm: use smram struct for 64 bit smram load/restore
  KVM: x86: SVM: use smram structs
  KVM: x86: SVM: don't save SVM state to SMRAM when VM is not long mode
    capable
  KVM: x86: emulator/smm: preserve interrupt shadow in SMRAM

 arch/x86/include/asm/kvm_host.h |  11 +-
 arch/x86/kvm/emulate.c          | 305 +++++++++++++++++---------------
 arch/x86/kvm/kvm_emulate.h      | 223 ++++++++++++++++++++++-
 arch/x86/kvm/svm/svm.c          |  30 ++--
 arch/x86/kvm/vmx/vmcs12.h       |   5 +-
 arch/x86/kvm/vmx/vmx.c          |   4 +-
 arch/x86/kvm/x86.c              | 175 +++++++++---------
 include/linux/build_bug.h       |   9 +
 8 files changed, 497 insertions(+), 265 deletions(-)

-- 
2.26.3