From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0C567146A6F; Tue, 6 Aug 2024 09:06:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722935183; cv=none; b=HK0CpuVPMGN9iLz5Ca3Lb+/XbcQ39vuZ2E9YNdqYyY/QU9N/8YMAbY6yx0RnJZY2rp4XlogKbF3z2/3qLh21AKTRzFxzzT5CtK8y0sbtle+paRmUIVpjNGAkDfzgGmrFF3tl1VdC1+1GoV+1kZ0ZxFj0xPTAubA2yMl2gEOhxxc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722935183; c=relaxed/simple; bh=DMlRsnLdaRLtv0G/piRyeI5GbI2qLHPyYzzOIBkJccE=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=hBMWDMwOUV9hMOmfbAi4Xh8A4rddXtbgGs4dWK7dM84koRwt/JzfixuMDmT9ci9ArGS1IRe9HkWmMXiQG6mXEw0rPJ15vbTuvN9UwXRgnSNPGIqrhNJTLwrqXIYSLSthkOooChSMgdTo6uldqcSCKiO6JRnEE2Mwfx5EFUlRVDE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=GWbTbYqc; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="GWbTbYqc" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=DMlRsnLdaRLtv0G/piRyeI5GbI2qLHPyYzzOIBkJccE=; b=GWbTbYqcABS/O4QCIhs20sEXWl jxzPF5ITApa9GmVl+qdMgYJrDOLlFS96caynYbAEEcxY4EtXOf+nM8abA8tVLL3uKsaCDWNr3dax5 Wsi+o2thHMPtENWMXgwh9xzrJJiOQz6gxdoyWL+DrEMPybd2H3hDfX3rt5AAPTRapGIQ7Y22vDW0x nk8muP4h/i7rB/vKwxFepr5E1zfZLVuOxSPA7Ie5UaqUsQHVnwRj15x0AXKdJFAZsAF0L0xYKsXg0 whC1nIj04153k1SUI7X3d0MnobkQcrBBBEOoUgcr+raPZ9VOr3xc67+MY/nGea+jOpIiXp30U9oQQ 3QLDqR0w==; Received: from [2001:8b0:10b:5:bc7d:65df:426f:516b] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sbG8u-00000005TgK-0Dsm; Tue, 06 Aug 2024 09:06:08 +0000 Message-ID: Subject: Re: [PATCH] KVM: Move gfn_to_pfn_cache invalidation to invalidate_range_end hook From: David Woodhouse To: Sean Christopherson Cc: Paolo Bonzini , Mushahid Hussain , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Mingwei Zhang , Maxim Levitsky Date: Tue, 06 Aug 2024 10:06:07 +0100 In-Reply-To: References: <20220427014004.1992589-1-seanjc@google.com> <20220427014004.1992589-7-seanjc@google.com> <294c8c437c2e48b318b8c27eb7467430dfcba92b.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-AEU9pcm6BNXt0UhTFZ90" User-Agent: Evolution 3.44.4-0ubuntu2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-AEU9pcm6BNXt0UhTFZ90 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2024-08-05 at 17:45 -0700, Sean Christopherson wrote: > On Mon, Aug 05, 2024, David Woodhouse wrote: > > From: David Woodhouse > >=20 > > The existing retry loop in hva_to_pfn_retry() is extremely pessimistic. > > If there is an invalidation running concurrently, it is effectively jus= t > > a complex busy wait loop because its local mmu_notifier_retry_cache() > > function will always return true. > >=20 > > It ends up functioning as a very unfair read/write lock. If userspace i= s > > acting as a 'writer', performing many unrelated MM changes, then the > > hva_to_pfn_retry() function acting as the 'reader' just backs off and > > keep retrying for ever, not making any progress. > >=20 > > Solve this by introducing a separate 'validating' flag to the GPC, so > > that it can be marked invalid before it's even mapped. This allows the > > invalidation to be moved to the range_end hook, and the retry loop in > > hva_to_pfn_retry() can be changed to loop only if its particular uHVA > > has been affected. >=20 > I think I'm missing something.=C2=A0 How does allowing hva_to_pfn_retry()= allow KVM > as a whole to make forward progress?=C2=A0 Doesn't getting past hva_to_pf= n_retry() > just move the problem to kvm_gpc_check()? >=20 > kvm_gpc_refresh() can't be called with gpc->lock held, and nor does it re= turn > with gpc->lock held, so a racing mmu_notifier invalidation can/will acqui= re > gpc->lock and clear gpc->active, no? >=20 > Oh, by "unrelated", you mean _completely_ unrelated?=C2=A0 As in, KVM hap= pens to do a > refresh when userspace is blasting MADV_DONTNEED, and gets stuck retrying= for > no good reason? Right. And again, I have no idea why userspace is doing that, and we need to make it stop. But that's not really the point; the kernel should be able to make progress anyway. > Servicing guest pages faults has the same problem, which is why > mmu_invalidate_retry_gfn() was added.=C2=A0 Supporting hva-only GPCs made= our lives a > little harder, but not horrifically so (there are ordering differences re= gardless). >=20 > Woefully incomplete, but I think this is the gist of what you want: Hm, maybe. It does mean that migration occurring all through memory (indeed, just one at top and bottom of guest memory space) would perturb GPCs which remain present. > > @@ -849,6 +837,8 @@ static void kvm_mmu_notifier_invalidate_range_end(s= truct mmu_notifier *mn, > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0wake =3D !kvm->mn_activ= e_invalidate_count; > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0spin_unlock(&kvm->mn_in= validate_lock); > > =C2=A0 > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0gfn_to_pfn_cache_invalidate(= kvm, range->start, range->end); >=20 > We can't do this.=C2=A0 The contract with mmu_notifiers is that secondary= MMUs must > unmap the hva before returning from invalidate_range_start(), and must no= t create > new mappings until invalidate_range_end(). But in the context of the GPC, it is only "mapped" when the ->valid bit is = set.=20 Even the invalidation callback just clears the valid bit, and that means nobody is allowed to dereference the ->khva any more. It doesn't matter that the underlying (stale) PFN is still kmapped. Can we not apply the same logic to the hva_to_pfn_retry() loop? Yes, it might kmap a page that gets removed, but it's not actually created a new mapping if it hasn't set the ->valid bit. I don't think this version quite meets the constraints, and I might need to hook *both* the start and end notifiers, and might not like it once I get there. But I'll have a go... --=-AEU9pcm6BNXt0UhTFZ90 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf ItMltrMaXqcESJuK8dtK56NCSrq4iDKaKq9NxOXFmqXX2zN8HHGjQ2b2Xv0v1L5Nk1MQPKA19xeW 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