linux-kernel - Re: [RFC PATCH 07/12] KVM: TDX: Avoid a double-KVM_BUG_ON() in tdx_sept_zap_private

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Message-ID: <f0ab4769b3c7b660b7326fa7cb95c59ebe8a4b48.camel@intel.com>
Date: Thu, 28 Aug 2025 02:19:42 +0000
From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To: "pbonzini@...hat.com" <pbonzini@...hat.com>, "seanjc@...gle.com"
	<seanjc@...gle.com>
CC: "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "Annapurve, Vishal"
	<vannapurve@...gle.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "Zhao, Yan Y" <yan.y.zhao@...el.com>,
	"michael.roth@....com" <michael.roth@....com>, "Weiny, Ira"
	<ira.weiny@...el.com>
Subject: Re: [RFC PATCH 07/12] KVM: TDX: Avoid a double-KVM_BUG_ON() in
 tdx_sept_zap_private_spte()

On Tue, 2025-08-26 at 17:05 -0700, Sean Christopherson wrote:
> Return -EIO immediately from tdx_sept_zap_private_spte() if the number of
> to-be-added pages underflows, so that the following "KVM_BUG_ON(err, kvm)"
> isn't also triggered.  Isolating the check from the "is premap error"
> if-statement will also allow adding a lockdep assertion that premap errors
> are encountered if and only if slots_lock is held.
> 
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---

Reviewed-by: Rick Edgecombe <rick.p.edgecombe@...el.com>