From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B8629C433F5 for ; Thu, 9 Dec 2021 20:42:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: List-Subscribe:List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: MIME-Version:References:In-Reply-To:Date:Cc:To:From:Subject:Message-ID: Reply-To:Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date :Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=vy51pujpsQ8PdERRQKXrAroPFPLW+2YyYNR32+pempw=; b=30Ad1vx42cG1EcDWdnORhYCSl+ 10iu1dT7uq26r4ylFeBlvg23pNa6e+zyLoC+skFPw4CprCtXj6s//g1t82nvpMZCTzdocb2+JMrmo 7ZynGSAO6Jy+HnK9MnlQzPN05LJQwoB/tSJ+TOnUKg6v8UZfep+Onzukrei1V19V4LrYHLhej3CxK OfoLFip3Hdd8ZHnquo4EV/iGb4js1b1kPyNuRpkYK2Mvz3svd1jeo3nRx4erir//CwRKPjqv0dZ+C FkWtBCAGMjNxtUSTDFkNvkbRjfOWuVUyDlfcrt+v4Olsyqg8jkX+8Nu0+/bqiZh6mBg+7h1gpslKQ 2yUZNeDw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mvQE3-00HVWr-8Z; Thu, 09 Dec 2021 20:41:11 +0000 Received: from 54-240-197-234.amazon.com ([54.240.197.234] helo=freeip.amazon.com) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mvQDn-00HVUV-CH; Thu, 09 Dec 2021 20:40:55 +0000 Message-ID: Subject: Re: [PATCH v5 08/12] KVM: Reinstate gfn_to_pfn_cache with invalidation support From: David Woodhouse To: Paolo Bonzini , kvm Cc: Boris Ostrovsky , Joao Martins , "jmattson @ google . com" , "wanpengli @ tencent . com" , "seanjc @ google . com" , "vkuznets @ redhat . com" , "mtosatti @ redhat . com" , "joro @ 8bytes . org" , karahmed@amazon.com, Marc Zyngier , James Morse , Alexandru Elisei , Suzuki K Poulose , Catalin Marinas , Will Deacon , Huacai Chen , Aleksandar Markovic , Michael Ellerman , Benjamin Herrenschmidt , Anup Patel , Christian Borntraeger , kvmarm@lists.cs.columbia.edu, linux-arm-kernel , linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-s390@vger.kernel.org, butt3rflyh4ck Date: Thu, 09 Dec 2021 20:40:48 +0000 In-Reply-To: References: <20211121125451.9489-1-dwmw2@infradead.org> <20211121125451.9489-9-dwmw2@infradead.org> User-Agent: Evolution 3.36.5-0ubuntu1 MIME-Version: 1.0 X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1160948481035334072==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============1160948481035334072== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-tGdrPlP/CxoRpyQj0J8H" --=-tGdrPlP/CxoRpyQj0J8H Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2021-12-09 at 19:34 +0100, Paolo Bonzini wrote: > Sorry for the late review... NP, very useful fixes. Thanks. Incremental patch looks like this. It passes the xen_shinfo_test self-test; will test it with real Xen guests tomorrow and repost based on your kvm/next tree once it shows up. diff --git a/virt/kvm/pfncache.c b/virt/kvm/pfncache.c index d8c6e1d4a647..9e3c662f815f 100644 --- a/virt/kvm/pfncache.c +++ b/virt/kvm/pfncache.c @@ -124,6 +124,33 @@ static void __release_gpc(struct kvm *kvm, kvm_pfn_t p= fn, void *khva, } } =20 +static kvm_pfn_t hva_to_pfn_retry(struct kvm *kvm, unsigned long uhva) +{ + unsigned long mmu_seq; + kvm_pfn_t new_pfn; + int retry; + + do { + mmu_seq =3D kvm->mmu_notifier_seq; + smp_rmb(); + + /* We always request a writeable mapping */ + new_pfn =3D hva_to_pfn(uhva, false, NULL, true, NULL); + if (is_error_noslot_pfn(new_pfn)) + break; + + KVM_MMU_READ_LOCK(kvm); + retry =3D mmu_notifier_retry_hva(kvm, mmu_seq, uhva); + KVM_MMU_READ_UNLOCK(kvm); + if (!retry) + break; + + cond_resched(); + } while (1); + + return new_pfn; +} + int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struct gfn_to_pfn_cache = *gpc, gpa_t gpa, unsigned long len, bool dirty) { @@ -147,7 +174,7 @@ int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struc= t gfn_to_pfn_cache *gpc, =20 old_gpa =3D gpc->gpa; old_pfn =3D gpc->pfn; - old_khva =3D gpc->khva; + old_khva =3D (void *)((unsigned long)gpc->khva & ~PAGE_MASK); old_uhva =3D gpc->uhva; old_valid =3D gpc->valid; old_dirty =3D gpc->dirty; @@ -178,8 +205,6 @@ int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struc= t gfn_to_pfn_cache *gpc, if (!old_valid || old_uhva !=3D gpc->uhva) { unsigned long uhva =3D gpc->uhva; void *new_khva =3D NULL; - unsigned long mmu_seq; - int retry; =20 /* Placeholders for "hva is valid but not yet mapped" */ gpc->pfn =3D KVM_PFN_ERR_FAULT; @@ -188,28 +213,15 @@ int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, str= uct gfn_to_pfn_cache *gpc, =20 write_unlock_irq(&gpc->lock); =20 - retry_map: - mmu_seq =3D kvm->mmu_notifier_seq; - smp_rmb(); - - /* We always request a writeable mapping */ - new_pfn =3D hva_to_pfn(uhva, false, NULL, true, NULL); + new_pfn =3D hva_to_pfn_retry(kvm, uhva); if (is_error_noslot_pfn(new_pfn)) { ret =3D -EFAULT; goto map_done; } =20 - KVM_MMU_READ_LOCK(kvm); - retry =3D mmu_notifier_retry_hva(kvm, mmu_seq, uhva); - KVM_MMU_READ_UNLOCK(kvm); - if (retry) { - cond_resched(); - goto retry_map; - } - if (gpc->kernel_map) { if (new_pfn =3D=3D old_pfn) { - new_khva =3D (void *)((unsigned long)old_khva - page_offset); + new_khva =3D old_khva; old_pfn =3D KVM_PFN_ERR_FAULT; old_khva =3D NULL; } else if (pfn_valid(new_pfn)) { @@ -219,7 +231,9 @@ int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struc= t gfn_to_pfn_cache *gpc, new_khva =3D memremap(pfn_to_hpa(new_pfn), PAGE_SIZE, MEMREMAP_WB); #endif } - if (!new_khva) + if (new_khva) + new_khva +=3D page_offset; + else ret =3D -EFAULT; } =20 @@ -232,7 +246,7 @@ int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struc= t gfn_to_pfn_cache *gpc, } else { /* At this point, gpc->valid may already have been cleared */ gpc->pfn =3D new_pfn; - gpc->khva =3D new_khva + page_offset; + gpc->khva =3D new_khva; } } else { /* If the HVA=E2=86=92PFN mapping was already valid, don't unmap it. */ --=-tGdrPlP/CxoRpyQj0J8H Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 OTU5WjAkMSIwIAYJKoZIhvcNAQkBFhNkd213MkBpbmZyYWRlYWQub3JnMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAsv3wObLTCbUA7GJqKj9vHGf+Fa+tpkO+ZRVve9EpNsMsfXhvFpb8 RgL8vD+L133wK6csYoDU7zKiAo92FMUWaY1Hy6HqvVr9oevfTV3xhB5rQO1RHJoAfkvhy+wpjo7Q 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