linux-kernel - Re: [PATCH v8 0/7] TDX host: kexec/kdump support

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Message-ID: <CABgObfb0Qc3hdXTmZvOykxuR+7RZ4vRUBpm8M84UmHgjwx7BCA@mail.gmail.com>
Date: Fri, 3 Oct 2025 15:09:17 +0200
From: Paolo Bonzini <pbonzini@...hat.com>
To: linux-kernel@...r.kernel.org, kvm@...r.kernel.org, dave.hansen@...el.com
Cc: bp@...en8.de, tglx@...utronix.de, peterz@...radead.org, mingo@...hat.com, 
	hpa@...or.com, thomas.lendacky@....com, x86@...nel.org, kas@...nel.org, 
	rick.p.edgecombe@...el.com, dwmw@...zon.co.uk, kai.huang@...el.com, 
	seanjc@...gle.com, reinette.chatre@...el.com, isaku.yamahata@...el.com, 
	dan.j.williams@...el.com, ashish.kalra@....com, nik.borisov@...e.com, 
	chao.gao@...el.com, sagis@...gle.com, farrah.chen@...el.com
Subject: Re: [PATCH v8 0/7] TDX host: kexec/kdump support

Hi Dave and others,

any reason why this series was not pulled into 6.18? I was a bit
surprised not to see it...

Thanks,

Paolo

On Mon, Sep 1, 2025 at 6:09 PM Paolo Bonzini <pbonzini@...hat.com> wrote:
>
> Currently kexec() support and TDX host are muturally exclusive in the
> Kconfig.  This series adds the TDX host kexec support so that they can
> be both enabled in Kconfig.
>
> With this series, the user can kexec (including crash kdump) to the new
> kernel at any time regardless of whether TDX has been enabled in the
> first kernel.  One limitation is if the first kernel has ever enabled
> TDX, for now the second kernel cannot use TDX.  This is the future work
> in my TODO list.
>
> This series should go in through the tip tree.
>
> Thanks,
>
> Paolo
>
> v7->v8: stub out the new code when kexec is not enabled in the kernel.
>         Of course even the smallest code change is subject to bikeshedding,
>         and I chose my preferred color for the bikeshed.  But it's pastel
>         green and I'm sure you'll agree that it's beautiful.
>
>
> Kai Huang (7):
>   x86/kexec: Consolidate relocate_kernel() function parameters
>   x86/sme: Use percpu boolean to control WBINVD during kexec
>   x86/virt/tdx: Mark memory cache state incoherent when making SEAMCALL
>   x86/kexec: Disable kexec/kdump on platforms with TDX partial write
>     erratum
>   x86/virt/tdx: Remove the !KEXEC_CORE dependency
>   x86/virt/tdx: Update the kexec section in the TDX documentation
>   KVM: TDX: Explicitly do WBINVD when no more TDX SEAMCALLs
>
>  Documentation/arch/x86/tdx.rst       | 14 ++++-----
>  arch/x86/Kconfig                     |  1 -
>  arch/x86/include/asm/kexec.h         | 12 ++++++--
>  arch/x86/include/asm/processor.h     |  2 ++
>  arch/x86/include/asm/tdx.h           | 31 +++++++++++++++++++-
>  arch/x86/kernel/cpu/amd.c            | 17 +++++++++++
>  arch/x86/kernel/machine_kexec_64.c   | 44 ++++++++++++++++++++++------
>  arch/x86/kernel/process.c            | 24 +++++++--------
>  arch/x86/kernel/relocate_kernel_64.S | 36 +++++++++++++++--------
>  arch/x86/kvm/vmx/tdx.c               | 10 +++++++
>  arch/x86/virt/vmx/tdx/tdx.c          | 23 +++++++++++++--
>  11 files changed, 167 insertions(+), 47 deletions(-)
>
> --
> 2.51.0