From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Kai Huang <kai.huang@intel.com>,
dave.hansen@intel.com, bp@alien8.de, tglx@linutronix.de,
peterz@infradead.org, mingo@redhat.com, hpa@zytor.com,
thomas.lendacky@amd.com, x86@kernel.org, kas@kernel.org,
rick.p.edgecombe@intel.com, dwmw@amazon.co.uk,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
reinette.chatre@intel.com, isaku.yamahata@intel.com,
dan.j.williams@intel.com, ashish.kalra@amd.com,
nik.borisov@suse.com, chao.gao@intel.com, sagis@google.com,
farrah.chen@intel.com, Binbin Wu <binbin.wu@linux.intel.com>
Subject: Re: [PATCH v7 7/7] KVM: TDX: Explicitly do WBINVD when no more TDX SEAMCALLs
Date: Tue, 26 Aug 2025 10:38:39 -0700 [thread overview]
Message-ID: <aK3xH4MGv9ZMxhyY@google.com> (raw)
In-Reply-To: <CABgObfaZjcDvFVWO7rsr2e_M=F6r=sEq+GHjtEp04uhj29=MuA@mail.gmail.com>
On Tue, Aug 26, 2025, Paolo Bonzini wrote:
> On Tue, Aug 26, 2025 at 7:10 PM Sean Christopherson <seanjc@google.com> wrote:
> > Can you add a comment here to explain why this is done even if the kernel doesn't
> > support kexec? I've no objection to the superfluous flushing, but I've spent far
> > too much time deciphering old commits where the changelog says one thing and the
> > code does something else with no explanation. I don't want to be party to such
> > crimes :-)
>
> I asked on the review for v6 to make this conditional on CONFIG_KEXEC_CORE
> with a stub; Kai said he'd rather not and I acquiesced, but now it looks
> like we're going to need a v8 just for this comment or to follow that
> suggestion of mine, which I still prefer to a comment.
FWIW, I also prefer conditioning the flush with an #ifdef (we could even have
both an #ifdef and a comment), but it's not a hill I'll die on.
prev parent reply other threads:[~2025-08-26 17:38 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-25 22:58 [PATCH v7 0/7] TDX host: kexec/kdump support Kai Huang
2025-08-25 22:58 ` [PATCH v7 1/7] x86/kexec: Consolidate relocate_kernel() function parameters Kai Huang
2025-08-26 17:28 ` David Woodhouse
2025-08-25 22:58 ` [PATCH v7 2/7] x86/sme: Use percpu boolean to control WBINVD during kexec Kai Huang
2025-08-25 22:58 ` [PATCH v7 3/7] x86/virt/tdx: Mark memory cache state incoherent when making SEAMCALL Kai Huang
2025-08-25 22:58 ` [PATCH v7 4/7] x86/kexec: Disable kexec/kdump on platforms with TDX partial write erratum Kai Huang
2025-08-25 22:58 ` [PATCH v7 5/7] x86/virt/tdx: Remove the !KEXEC_CORE dependency Kai Huang
2025-08-25 22:58 ` [PATCH v7 6/7] x86/virt/tdx: Update the kexec section in the TDX documentation Kai Huang
2025-08-25 22:58 ` [PATCH v7 7/7] KVM: TDX: Explicitly do WBINVD when no more TDX SEAMCALLs Kai Huang
2025-08-26 17:10 ` Sean Christopherson
2025-08-26 17:18 ` Dave Hansen
2025-08-26 23:31 ` Edgecombe, Rick P
2025-08-26 17:20 ` Paolo Bonzini
2025-08-26 17:38 ` Sean Christopherson [this message]
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