linux-kernel - Re: [PATCH v4 0/6] KVM: x86: Prep KVM hypercall handling for TDX

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Message-ID: <173457537849.3292936.8364596188659598507.b4-ty@google.com>
Date: Wed, 18 Dec 2024 18:40:42 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Tom Lendacky <thomas.lendacky@....com>, Binbin Wu <binbin.wu@...ux.intel.com>, 
	Isaku Yamahata <isaku.yamahata@...el.com>, Kai Huang <kai.huang@...el.com>, 
	Xiaoyao Li <xiaoyao.li@...el.com>
Subject: Re: [PATCH v4 0/6] KVM: x86: Prep KVM hypercall handling for TDX

On Wed, 27 Nov 2024 16:43:38 -0800, Sean Christopherson wrote:
> Effectively v4 of Binbin's series to handle hypercall exits to userspace in
> a generic manner, so that TDX
> 
> Binbin and Kai, this is fairly different that what we last discussed.  While
> sorting through Binbin's latest patch, I stumbled on what I think/hope is an
> approach that will make life easier for TDX.  Rather than have common code
> set the return value, _and_ have TDX implement a callback to do the same for
> user return MSRs, just use the callback for all paths.
> 
> [...]

Applied patch 1 to kvm-x86 fixes.  I'm going to hold off on the rest until the
dust settles on the SEAMCALL interfaces, e.g. in case TDX ends up marshalling
state into the "normal" GPRs.

[1/6] KVM: x86: Play nice with protected guests in complete_hypercall_exit()
      https://github.com/kvm-x86/linux/commit/a317794eefd0
[2/6] KVM: x86: Add a helper to check for user interception of KVM hypercalls
      (no commit info)
[3/6] KVM: x86: Move "emulate hypercall" function declarations to x86.h
      (no commit info)
[4/6] KVM: x86: Bump hypercall stat prior to fully completing hypercall
      (no commit info)
[5/6] KVM: x86: Always complete hypercall via function callback
      (no commit info)
[6/6] KVM: x86: Refactor __kvm_emulate_hypercall() into a macro
      (no commit info)

--
https://github.com/kvm-x86/linux/tree/next