linux-kernel - Re: [PATCH v2 00/11] SMM emulation and interrupt shadow fixes

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Date:   Wed, 29 Jun 2022 10:21:45 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>, x86@...nel.org,
        Kees Cook <keescook@...omium.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
        Borislav Petkov <bp@...en8.de>, Joerg Roedel <joro@...tes.org>,
        Ingo Molnar <mingo@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH v2 00/11] SMM emulation and interrupt shadow fixes

On Tue, 2022-06-21 at 18:08 +0300, Maxim Levitsky wrote:
> 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.
> 
> Best regards,
> 	Maxim Levitsky
> 
> Maxim Levitsky (11):
>   KVM: x86: emulator: em_sysexit should update ctxt->mode
>   KVM: x86: emulator: introduce update_emulation_mode
>   KVM: x86: emulator: remove assign_eip_near/far
>   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 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: emulator/smm: preserve interrupt shadow in SMRAM
> 
>  arch/x86/include/asm/kvm_host.h |   6 -
>  arch/x86/kvm/emulate.c          | 305 ++++++++++++++++----------------
>  arch/x86/kvm/kvm_emulate.h      | 146 +++++++++++++++
>  arch/x86/kvm/svm/svm.c          |  28 +--
>  arch/x86/kvm/x86.c              | 162 ++++++++---------
>  5 files changed, 394 insertions(+), 253 deletions(-)
> 
> -- 
> 2.26.3
> 
> 
A very gentle ping on the patch series.

Best regards,
	Maxim Levitsky