From patchwork Sat May 13 00:35:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 13240055 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 D2584C7EE24 for ; Sat, 13 May 2023 00:37:10 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3A70210E718; Sat, 13 May 2023 00:37:10 +0000 (UTC) Received: from mail-pj1-x104a.google.com (mail-pj1-x104a.google.com [IPv6:2607:f8b0:4864:20::104a]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4E2D110E707 for ; Sat, 13 May 2023 00:36:53 +0000 (UTC) Received: by mail-pj1-x104a.google.com with SMTP id 98e67ed59e1d1-24dfc3c668dso5548406a91.1 for ; Fri, 12 May 2023 17:36:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1683938213; x=1686530213; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=txxFy4l/0CjWXE2Lls1C8TlXhZ8gDD/lHA0CcUxieGg=; b=1haVJ2yfzvTDJ7OWiHD70BYBmN550CeOMY4hpPZ+nSFvEJEzGlp9zifp2JC9DTsBnT RJZuYPoZBC56u7q5NVSap0DjOvLwxYApwLH9hRiHGYxDoZJvwxzHUiwRC9eia+w/uZP7 EBybQwdiAWLVgS8BlsYrTOIiunclWLH+LI0gc9Tnj4BM3xt3lZRaMifAigMxY42RgfDp cwJG3qN9EWZwmkGrQazhnNhAbchLqLap871kMkvWtbxo/QXAGrSEZskw2tAXxrat7ud/ D5ZrbarX8RzkvaRosayYzhljq+hKPOqhGf/8xnjwY+T70UILI2/0G0yJJiJRMoQtMPm0 3+WA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683938213; x=1686530213; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=txxFy4l/0CjWXE2Lls1C8TlXhZ8gDD/lHA0CcUxieGg=; b=C0tm1+Ni1DmQSls8TxWwUK2gPXQRVCN/AUicbXev7ia7cfvkXRHzqVQcec62F+OJMD NKrSaA54P/PVQL41AjQhD3RQ7M7AJmOr+nrEWyBY+XYapyEogtCHGdnfXsZHYyeaQgsS ka23rXAqd6nMXF/Y0u1puE8usSNU2xB7CRt2/Cfw9ZQ27GO28HzGjaCyMGtyPR3r5wd2 BpOs3lvZVFSd9GIomwb2ygScb9QPDkf0E4s41jWrE061DYjy0F459lw+IlY9bhK3oXjs 6kzkOPqCxDOU70DvfTU6tlSOR7uj2Y4mU8qyuIKF3wcB2p2xql+XfAAXSC1L9XP0fwf+ OxBQ== X-Gm-Message-State: AC+VfDz2nPradbDEt9gkKZrNt0dyprVcdlt2BsKLks/ssCjz8EpF2qDo nBDAC56LjGwxrZkeA6b1Z/uuGZ5UnMU= X-Google-Smtp-Source: ACHHUZ43CFxrthXwP0PrBV5od9hQAGg5BAA+rVUflMCCD1sy9tgjBk8pzYcx5eiJpCd5q4pFPenl/fUx+Qk= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a17:90b:148:b0:246:f99b:fd65 with SMTP id em8-20020a17090b014800b00246f99bfd65mr8121515pjb.5.1683938212995; Fri, 12 May 2023 17:36:52 -0700 (PDT) Date: Fri, 12 May 2023 17:35:57 -0700 In-Reply-To: <20230513003600.818142-1-seanjc@google.com> Mime-Version: 1.0 References: <20230513003600.818142-1-seanjc@google.com> X-Mailer: git-send-email 2.40.1.606.ga4b1b128d6-goog Message-ID: <20230513003600.818142-26-seanjc@google.com> From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini , Zhenyu Wang , Zhi Wang Subject: [Intel-gfx] [PATCH v3 25/28] KVM: x86/mmu: Bug the VM if write-tracking is used but not enabled X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Sean Christopherson Cc: Yan Zhao , kvm@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, Ben Gardon , intel-gvt-dev@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Bug the VM if something attempts to write-track a gfn, but write-tracking isn't enabled. The VM is doomed (and KVM has an egregious bug) if KVM or KVMGT wants to shadow guest page tables but can't because write-tracking isn't enabled. Signed-off-by: Sean Christopherson --- arch/x86/kvm/mmu/page_track.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/mmu/page_track.c b/arch/x86/kvm/mmu/page_track.c index 29ae61f1e303..eedb5889d73e 100644 --- a/arch/x86/kvm/mmu/page_track.c +++ b/arch/x86/kvm/mmu/page_track.c @@ -90,7 +90,7 @@ void kvm_write_track_add_gfn(struct kvm *kvm, struct kvm_memory_slot *slot, lockdep_assert_once(lockdep_is_held(&kvm->slots_lock) || srcu_read_lock_held(&kvm->srcu)); - if (WARN_ON(!kvm_page_track_write_tracking_enabled(kvm))) + if (KVM_BUG_ON(!kvm_page_track_write_tracking_enabled(kvm), kvm)) return; update_gfn_write_track(slot, gfn, 1); @@ -122,7 +122,7 @@ void kvm_write_track_remove_gfn(struct kvm *kvm, lockdep_assert_once(lockdep_is_held(&kvm->slots_lock) || srcu_read_lock_held(&kvm->srcu)); - if (WARN_ON(!kvm_page_track_write_tracking_enabled(kvm))) + if (KVM_BUG_ON(!kvm_page_track_write_tracking_enabled(kvm), kvm)) return; update_gfn_write_track(slot, gfn, -1);