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Peter Anvin" , Jonathan Corbet , Randy Dunlap , Shuah Khan , Vitaly Kuznetsov , Paul Durrant , Xin Li , Francesco Lavra , Radim =?UTF-8?Q?Kr=C4=8Dm=C3=A1=C5=99?= , linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, linux-kernel@vger.kernel.org Date: Fri, 13 Nov 2026 11:16:20 -0700 In-Reply-To: References: <90467782be23b83fd3e9a6afe2f1d2149eaf9db9.1794374897.git.zack.rusin@broadcom.com> <876c4f4fc442116c9bff8abd8c34f99fcfa65531.camel@infradead.org> <1bae109338ab6ff1ff14eac811f7e86ced785b22.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-Hw+hWHuUyyHEhRnfc+6D" User-Agent: Evolution 3.62.0-0ubuntu1~ppa1~24.04 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-Hw+hWHuUyyHEhRnfc+6D Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2026-11-13 at 01:33 -0500, Zack Rusin wrote: > On Thu, Nov 12, 2026 at 11:56=E2=80=AFPM David Woodhouse wrote: > >=20 > > On Thu, 2026-11-12 at 20:05 -0500, Zack Rusin wrote: > > >=20 > > > > And I wonder if the cleaner answer in both cases is just to give > > > > userspace a way to cancel the pending hypercall completion and use > > > > KVM_SET_VCPU_EVENTS instead of piling all this stuff into the hcall > > > > structs? It could even just be a KVM_VCPUEVENT_ flag to make it can= cel > > > > the hypercall completion? > > >=20 > > > I agree that this would be cleaner, and if KVM grows such a flag, > > > VMware userspace could use it too.=C2=A0 But it's new API in > > > KVM_SET_VCPU_EVENTS, and we'd need to agree which completions it may > > > cancel: simply clearing the callback leaves pending I/O state behind > > > for PIO and MMIO, and KVM_EXIT_HYPERCALL also covers TDX completions > > > with different semantics.=C2=A0 So I'd rather not make this series de= pend > > > on it because it significantly increases its scope. > >=20 > > I won't necessarily defend my suggestion above to the hilt on its > > technical merit, but I'll observe that as a counter-argument, yours > > *really* isn't a good one. We don't design a userspace ABI based on the > > fact that we're impatient. >=20 > I think that's a misreading of my concern: it wasn't impatience but > coupling the VMware series to a new cross-cutting semantic in > KVM_SET_VCPU_EVENTS.=C2=A0 The current approach is self-contained.=C2=A0 = The > exception fields were already in v2; Sean's only comment on that > struct was to move it into the x86 UAPI header. Fair. > > To your concern, I actually think we could get away with aborting *any* > > pending complete_userspace_io callback. >=20 > I'm not sure about that. I think simply dropping a PIO or MMIO > completion can leave pio.count or mmio_needed set, triggering WARNs in > KVM_RUN. Retrying an MMIO read can replay device side effects, while > dropping a split-write completion can abandon remaining fragments. > Also afaict for SEV-ES/SNP and TDX, KVM can't simply replay the > guest's VMGEXIT/TDCALL: RIP has already advanced.=C2=A0 Dropping the > completion can lose returned data or leave a multi-step request such > as SNP PSC unfinished. >=20 > > Userspace *already* needed to > > know about those=C2=B9 because it can't migrate while those are pending= ; > > it has to do at least one more run, even if it's with the immediate_exi= t > > flag set. >=20 > True, but, again afaict, that rule exists because those completions > have to run, so I don't think it tells us they can be dropped. >=20 > > If it's deemed clearer, I'd also be OK with an explicit > > KVM_VCPUEVENT_CANCEL_HCALL which cancels *only* hypercalls. But I don't > > really see the point; userspace shouldn't be getting confused when it > > was actually some other kind of completion that was active anyway. > >=20 > > =C2=B9 https://lore.kernel.org/all/20250111012450.1262638-1-seanjc@goog= le.com/ > >=20 > > Looks something like this in my Hyper-V hcall series (except I already > > shouted at the agent for stupid struct layout and made it go run pahole > > on everything it's working on). >=20 > FWIW, restricting cancellation to explicitly marked completions looks > good to me.=C2=A0 If Sean/Paolo prefer that, I'm happy to mark our > completion cancellable and drop our exception fields. I posted that as https://lore.kernel.org/kvm/20261113170535.79246-3-dwmw2@infradead.org/T/#u and caught both Paolo and Sean here at KVM Forum and both seem OK with it (although acquiescence when badgered at a conference doesn't necessarily translate to applying the patch... :) --=-Hw+hWHuUyyHEhRnfc+6D Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBHMjAeFw0yNDAzMTMwMDAwMDBaFw0zNDAz MTIyMzU5NTlaMGIxCzAJBgNVBAYTAlVTMRcwFQYDVQQKEw5EaWdpQ2VydCwgSW5jLjE6MDgGA1UE AxMxRGlnaUNlcnQgQXNzdXJlZCBHMiBTTUlNRSBSU0E0MDk2IFNIQTM4NCAyMDI0IENBMTCCAiIw DQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAOfSIeC0vv1xPQ+dgSxbIIrkaru6skAWJYaGFzmv 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