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 0BF16CD3427 for ; Sun, 10 May 2026 22:11:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:MIME-Version:Content-Type: Date:To:From:Subject:Message-ID:Reply-To:Cc:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=77Zg783VrPv87K9sXBqm8YiYCgmGnFlFS5aCfEu+93k=; b=tzOaJdAag3SixqnAYvaKEX1jU4 mbKETA/CNt9iB7RLIM/MiPJCLyZi40cXWhfe/C+/+BpeebovSy3msM43CNWS2DkzbUxnWNdGSzoJi hw7sqLy2YngjgnE1UpXF+GQKB3m381idzdssyzF87ro71JgzkM5DrRpNMGZpOblkuNrlaAXZhK1KD idz04ygFujd4qxV3iGNywlBSm01EL75w8Ht3c3RObrKT2LGBdwywA/bM314dU7t2c8jdYYvJg6UWg SnVD0AzntOGm3xbA4oecLAoDelLXdvV48ZgYm5uFCh7LnlwKi++3M5pCzfgOgPiN4bYolxPJQdNRr +auauZfw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wMCNK-0000000BjST-08qw; Sun, 10 May 2026 22:11:50 +0000 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wMCNI-0000000BjSH-1tu4 for linux-arm-kernel@bombadil.infradead.org; Sun, 10 May 2026 22:11:48 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:Date:To:From: Subject:Message-ID:Sender:Reply-To:Cc:Content-Transfer-Encoding:Content-ID: Content-Description:In-Reply-To:References; bh=77Zg783VrPv87K9sXBqm8YiYCgmGnFlFS5aCfEu+93k=; b=aFL9uz7TmFvha+HSwKHFofi3GS 0kFjeVSc4UE3MqaEqC4ykQiLtwA7BWXxCGxMU9nbKqsh5nAvLXyl6K4BL5fSu2ZwJQb4lkHomcZMk FJXXMqbstGNQHUhoAqhLtG8O/vcdjdD6Z3VmjW43UYsBIf81wh+jDF4VzftpRsrMm5AfXbCyhzV9j hiFkIorSHZDLKkB040Svr4xp5sa0f0FGNxByJ6fmZ2EhKnaSL4CPGnXmKvQUDrcsw2BLxSsMbEpgn LUwvo2Zhsk6hAtHaeuup86QM681mLxCcE81xXMIcPyYPGRRSFHaJYHeRNVf6865DOoBU+ctSyH8VE udeZaQww==; Received: from 54-240-197-234.amazon.com ([54.240.197.234] helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wMCNE-00000007Jnj-2e0u; Sun, 10 May 2026 22:11:45 +0000 Message-ID: <6564c8b967948e30a8d3f35b6ef5de79dd5feeb7.camel@infradead.org> Subject: [RFC PATCH] KVM: arm64: vgic: Skip vCPU trylock for pre-init register access From: David Woodhouse To: Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Sascha Bischoff , Paolo Bonzini , Jonathan Cameron , Eric Auger , Raghavendra Rao Ananta , David Woodhouse , Maxim Levitsky , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvm@vger.kernel.org Date: Sun, 10 May 2026 23:11:43 +0100 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-Ro5SzoKkXs6S8pUv+ypN" User-Agent: Evolution 3.52.3-0ubuntu1.1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --=-Ro5SzoKkXs6S8pUv+ypN Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable From: David Woodhouse When creating a VM, userspace sets pre-init distributor registers such as GICD_IIDR before the VGIC is initialized. Strictly speaking there's no reason this couldn't be done at VM creation time before any vCPUs exist at all, but the design of the userspace API does require vCPU0 to have been created, as the system-wide registers are effectively accessed via vCPU0. So a VMM can't just set the IIDR at startup before spawning vCPU threads; it has to be done once the vCPUs are being created. However, kvm_trylock_all_vcpus() makes it unreliable by causing spurious -EBUSY failures if any vCPU cannot be locked. So userspace is forced to create the vCPUs (well, at least vCPU0), and is then forced to have a full synchronization point and quiesce them all in order to reliably set the IIDR. To slightly reduce the pain of all this, skip the trylock when the VGIC is not yet initialized. There is no need to lock the vCPUs if they can't be accessing it anyway. Signed-off-by: David Woodhouse --- Other options would include making it possible to set the IIDR before creating any vCPUs, either by creating a new device-level attribute or special-casing it not to require vCPU0 for DIST_REGS that aren't really associated to a vCPU. Deprecating kvm_trylock_all_vcpus() and killing every user of it with fire would also be a good option, perhaps... :) arch/arm64/kvm/vgic/vgic-kvm-device.c | 38 ++++++++++++++++++++------- 1 file changed, 29 insertions(+), 9 deletions(-) diff --git a/arch/arm64/kvm/vgic/vgic-kvm-device.c b/arch/arm64/kvm/vgic/vg= ic-kvm-device.c index a96c77dccf35..e17ea9f07f5f 100644 --- a/arch/arm64/kvm/vgic/vgic-kvm-device.c +++ b/arch/arm64/kvm/vgic/vgic-kvm-device.c @@ -540,7 +540,7 @@ static int vgic_v3_attr_regs_access(struct kvm_device *= dev, struct vgic_reg_attr reg_attr; gpa_t addr; struct kvm_vcpu *vcpu; - bool uaccess; + bool uaccess, vcpus_locked =3D false; u32 val; int ret; =20 @@ -566,18 +566,37 @@ static int vgic_v3_attr_regs_access(struct kvm_device= *dev, return -EFAULT; } =20 + if (!vgic_initialized(dev->kvm) && !reg_allowed_pre_init(attr)) + return -EBUSY; + mutex_lock(&dev->kvm->lock); =20 - if (kvm_trylock_all_vcpus(dev->kvm)) { - mutex_unlock(&dev->kvm->lock); - return -EBUSY; + /* + * Pre-init registers (e.g. GICD_IIDR) don't need vCPU quiescence + * since the VGIC isn't live yet. Skip the trylock to avoid spurious + * -EBUSY when vCPU threads happen to be running. + */ + if (vgic_initialized(dev->kvm)) { + if (kvm_trylock_all_vcpus(dev->kvm)) { + mutex_unlock(&dev->kvm->lock); + return -EBUSY; + } + vcpus_locked =3D true; } - mutex_lock(&dev->kvm->arch.config_lock); =20 - if (!(vgic_initialized(dev->kvm) || reg_allowed_pre_init(attr))) { - ret =3D -EBUSY; - goto out; + /* + * If the VGIC becomes initialized between the above check and taking + * config_lock, drop config_lock to lock the VCPUS. + */ + if (vgic_initialized(dev->kvm) && !vcpus_locked) { + mutex_unlock(&dev->kvm->arch.config_lock); + if (kvm_trylock_all_vcpus(dev->kvm)) { + mutex_unlock(&dev->kvm->lock); + return -EBUSY; + } + mutex_lock(&dev->kvm->arch.config_lock); + vcpus_locked =3D true; } =20 switch (attr->group) { @@ -612,7 +631,8 @@ static int vgic_v3_attr_regs_access(struct kvm_device *= dev, =20 out: mutex_unlock(&dev->kvm->arch.config_lock); - kvm_unlock_all_vcpus(dev->kvm); + if (vcpus_locked) + kvm_unlock_all_vcpus(dev->kvm); mutex_unlock(&dev->kvm->lock); =20 if (!ret && uaccess && !is_write) { --=20 2.43.0 --=-Ro5SzoKkXs6S8pUv+ypN Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv a2V5IFNlY3VyZSBFbWFpbCBHMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMjvgLKj jfhCFqxYyRiW8g3cNFAvltDbK5AzcOaR7yVzVGadr4YcCVxjKrEJOgi7WEOH8rUgCNB5cTD8N/Et GfZI+LGqSv0YtNa54T9D1AWJy08ZKkWvfGGIXN9UFAPMJ6OLLH/UUEgFa+7KlrEvMUupDFGnnR06 aDJAwtycb8yXtILj+TvfhLFhafxroXrflspavejQkEiHjNjtHnwbZ+o43g0/yxjwnarGI3kgcak7 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