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From: "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>
To: "pbonzini@redhat.com" <pbonzini@redhat.com>,
	"prsampat@amd.com" <prsampat@amd.com>
Cc: "dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
	"marcandre.lureau@redhat.com" <marcandre.lureau@redhat.com>,
	"kas@kernel.org" <kas@kernel.org>, "bp@alien8.de" <bp@alien8.de>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"mingo@redhat.com" <mingo@redhat.com>,
	"x86@kernel.org" <x86@kernel.org>,
	"Qiang, Chenyi" <chenyi.qiang@intel.com>,
	"tglx@kernel.org" <tglx@kernel.org>,
	"hpa@zytor.com" <hpa@zytor.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"linux-coco@lists.linux.dev" <linux-coco@lists.linux.dev>
Subject: Re: [PATCH 2/2] x86/tdx: Accept hotplugged memory before online
Date: Wed, 1 Apr 2026 15:49:41 +0000	[thread overview]
Message-ID: <819d84c1e62a8bac7ed22c402e1f2015958b6e04.camel@intel.com> (raw)
In-Reply-To: <49e8b24d836c1883e83ad72d1ab279f9e3eb7455.camel@intel.com>

On Wed, 2026-04-01 at 08:39 -0700, Edgecombe, Rick P wrote:
> > Would it not be better to have this information in the unaccepted
> > bitmap which we could explicitly query to accept/unaccept?
> 
> It makes me think about shared memory too. Should the unplug event
> also signal the host to reset the memory to private? If the VMM is
> actually not adjusting the guest mapping for a unplug/re-plug then
> the memory would come back as shared.
> 
> But it really starts to feel like work the host should be doing.

Although if memory was able to be unplugged, the Linux guest would have
reset the memory to private when it was done with the memory. But from
a interface perspective, it seems weird to require the guest to signal
this because private/shared state is ultimately controlled by the host.
Unlike accept state where the guest gets some say.

  reply	other threads:[~2026-04-01 15:49 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-24 15:21 [PATCH 0/2] x86/tdx: Fix memory hotplug in TDX guests Marc-André Lureau
2026-03-24 15:21 ` [PATCH 1/2] x86/tdx: Handle TDG.MEM.PAGE.ACCEPT success-with-warning returns Marc-André Lureau
2026-03-24 22:02   ` Edgecombe, Rick P
2026-03-24 15:21 ` [PATCH 2/2] x86/tdx: Accept hotplugged memory before online Marc-André Lureau
2026-03-24 22:03   ` Edgecombe, Rick P
2026-03-25 10:29     ` Marc-André Lureau
2026-03-25 17:21       ` Edgecombe, Rick P
2026-03-26 18:25         ` Paolo Bonzini
2026-03-26 20:40           ` Edgecombe, Rick P
2026-03-30 12:29             ` Kiryl Shutsemau
2026-03-30 15:10             ` Pratik R. Sampat
2026-04-01 15:37               ` Edgecombe, Rick P
2026-04-01 15:49                 ` Edgecombe, Rick P [this message]
2026-04-02  8:18                 ` Reshetova, Elena
2026-04-02 17:06                   ` Edgecombe, Rick P
2026-04-03 10:37                     ` Reshetova, Elena
2026-04-03 19:41                       ` Edgecombe, Rick P
2026-04-08  8:22                         ` Reshetova, Elena
2026-04-08 19:55                           ` Pratik R. Sampat
2026-04-09  1:35                         ` Duan, Zhenzhong
2026-04-09 15:19                           ` Marc-André Lureau
2026-04-10  1:05                             ` Duan, Zhenzhong
2026-04-10  7:49                               ` David Hildenbrand (Arm)
2026-03-27  3:05       ` Chenyi Qiang
2026-03-27  8:49         ` David Hildenbrand (Arm)
2026-03-27  8:28   ` Yan Zhao
2026-03-30 12:17     ` Marc-André Lureau

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