From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x225DfebefLyynVenS30aYMYJHd1vr5YZKBZ9t0Nnk4p0DSSlryDchypmDcwcLiZPrwR8YQLp ARC-Seal: i=1; a=rsa-sha256; t=1516873786; cv=none; d=google.com; s=arc-20160816; b=o52WziyYW2fdFPg2lJ5VNq+edNccbkRMxQwS1qOjnbyU99N0Tiw7fJQ/+3rsfnE06F jvHlkzkwEZZsUnPbjGHjMhGEb20AAYONFkFqJz+pTe9SKFpiHOjUMTDTV5mVdViAdLWX Pc8Q4YTVr1XuvoGklKYHvOPMpJDEXp/FLfBH+kNWVIlE43qk7bsU618vCIAlFOan0kJb iPcCgR5AnBr0TJqd9Jp/Hkas6mONQ3zXxlWDYB6IBxolz6uCCsvU92V+d73GeO9NTrgf J+KvZXI/Jl0HRZNE8Tj+FjYzCCPWJnaBnqInVumEaN1A8ZOLfJ6I+uAOP6ENRdp61LJ7 KsAw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:date:face:references:in-reply-to:cc:to:from:subject :message-id:dkim-signature:arc-authentication-results; bh=d3zbXInEA12CwFj479H3gUTDQ1Z/5/LyygqpmGoNg44=; b=WFIUUPqpvSocpCD6me2HZtRPEDGYzUheyym1/Us6J5nq+U5fda2sQvEugznCDIg53l /5Ncvf5I5hyehQFC8QajnTGNA0ll9qJbMw+L92dWJroxuLGIiydX/1ytwepLGMN+qRIZ eTgI1x9PZTW8qeXl9TKXp85zNwSeVoSUuh3m1l16Boj9hHHaeMJcYfXuvBUomlDTJbP+ w9Lexs+NSYkHmGR2pjAVt0kfh3GCZUFKd9fFrdVenODo7OiasyIx7IY7tQASWZMI7MUd M7hkzqTr30PjuYfbL1R7p0PzQkucsELU0EIvxBNTIDo68dU1khFSNPYecf1s+LouzHa1 M4Ow== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=o2qwzdEx; spf=pass (google.com: best guess record for domain of batv+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 as permitted sender) smtp.mailfrom=BATV+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=o2qwzdEx; spf=pass (google.com: best guess record for domain of batv+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 as permitted sender) smtp.mailfrom=BATV+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1516873753.30244.34.camel@infradead.org> Subject: Re: [PATCH 06/24] x86,kvm: Fix indirect calls in emulator From: David Woodhouse To: Peter Zijlstra , Paolo Bonzini Cc: Borislav Petkov , Thomas Gleixner , Josh Poimboeuf , linux-kernel@vger.kernel.org, Dave Hansen , Ashok Raj , Tim Chen , Andy Lutomirski , Linus Torvalds , Greg KH , Andrea Arcangeli , Andi Kleen , Arjan Van De Ven , Dan Williams , Jun Nakajima , Asit Mallick , Jason Baron In-Reply-To: <20180125093453.GX2228@hirez.programming.kicks-ass.net> References: <20180123152539.374360046@infradead.org> <20180123152638.336674335@infradead.org> <20180123202859.qc5frxyonavtkhpz@pd.tnic> <1516740493.13558.3.camel@infradead.org> <20180124103525.GR2228@hirez.programming.kicks-ass.net> <9fe90910-7908-f570-0088-568213f52a78@redhat.com> <20180125093453.GX2228@hirez.programming.kicks-ass.net> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-XtQp8Pz6pp7D7UKiVrLF" Date: Thu, 25 Jan 2018 09:49:13 +0000 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1590397846081548237?= X-GMAIL-MSGID: =?utf-8?q?1590557447182202044?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-XtQp8Pz6pp7D7UKiVrLF Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2018-01-25 at 10:34 +0100, Peter Zijlstra wrote: > On Wed, Jan 24, 2018 at 11:43:05AM +0100, Paolo Bonzini wrote: > >=20 > > On 24/01/2018 11:35, Peter Zijlstra wrote: > > >=20 > > > On Tue, Jan 23, 2018 at 08:48:13PM +0000, David Woodhouse wrote: > > > >=20 > > > > On Tue, 2018-01-23 at 21:28 +0100, Borislav Petkov wrote: > > > > >=20 > > > > >=20 > > > > > >=20 > > > > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0flags =3D (flags & EF= LAGS_MASK) | X86_EFLAGS_IF; > > > > > > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0asm("push %[flags]; popf; call *= %[fastop]" > > > > > > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 : "=3Da"(rc) = : [fastop]"r"(fop), [flags]"r"(flags)); > > > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0asm("push %[flags]; popf; " CALL= _NOSPEC > > > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 : "=3Da"(rc) = : [thunk_target]"r"(fop), [flags]"r"(flags)); > > > > > Oh, "thunk_target" is magical. > > > > You can use THUNK_TARGET(fop), which will be "rm" on 32-bit and avo= ids > > > > register starvation in some cases (I don't think the hyperv calls > > > > worked until I did that). > > > The reason I didn't use THUNK_TARGET() was exactly because it used "r= m" > > > and the current code did "r" only. I'm happy to change if people can > > > agree on something ;-) > > In practice, "fastop" is going to be in a register because of how it's > > computed, but "rm" is okay. > OK, so the other occurence in that file uses "+S", which is the SI > register. That cannot use THUNK_TARGET(), right? >=20 > So do you want one THUNK_TARGET and one open coded, or keep the patch as > is (both open coded) ? As long as it builds for i386, you might as well keep them both open- coded.=C2=A0The "rm"=C2=A0was there mostly for the hyperv call, which ran o= ut of registers completely when it was just "r". This patch *really* wants to be going to Linus urgently as a retpoline fix, and not buried as patch 6/24 though, right? Likewise 7/24?=C2=A0 Both of them, Reviewed-by: David Woodhouse ... unless you want me to send them on, but it makes most sense for Thomas to round them I suspect? --=-XtQp8Pz6pp7D7UKiVrLF Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEFQw ggUxMIIEGaADAgECAhBNRhEyk/HZ7naOeTHWrzuAMA0GCSqGSIb3DQEBCwUAMIGXMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYD VQQKExFDT01PRE8gQ0EgTGltaXRlZDE9MDsGA1UEAxM0Q09NT0RPIFJTQSBDbGllbnQgQXV0aGVu dGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTAeFw0xNzEyMjEwMDAwMDBaFw0xODEyMjEyMzU5 NTlaMCQxIjAgBgkqhkiG9w0BCQEWE2R3bXcyQGluZnJhZGVhZC5vcmcwggEiMA0GCSqGSIb3DQEB AQUAA4IBDwAwggEKAoIBAQDgzLNWa18DNpGUj/ZeH0Sgz53ESIbzdPw3OJeuNP6jZhxZojbyfxbM hETscxI/Hj6UZ4a7sHm5BkVjlsB1Af2Za/PXUt8MmLAcPMHkMPGunvkUibEvblDvpqMkQZlaZM+t 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