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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 7B28AEE0213 for ; Thu, 14 Sep 2023 01:59:55 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20230601 header.b=axl1EC0J; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4RmL9j6g8Nz3dDy for ; Thu, 14 Sep 2023 11:59:53 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20230601 header.b=axl1EC0J; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=flex--seanjc.bounces.google.com (client-ip=2607:f8b0:4864:20::b4a; helo=mail-yb1-xb4a.google.com; envelope-from=3h2gczqykdcgwierngksskpi.gsqpmrybttg-hizpmwxw.sdpefw.svk@flex--seanjc.bounces.google.com; receiver=lists.ozlabs.org) Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4RmL4y382tz3bTn for ; Thu, 14 Sep 2023 11:55:46 +1000 (AEST) Received: by mail-yb1-xb4a.google.com with SMTP id 3f1490d57ef6-d7fd4c23315so544265276.2 for ; Wed, 13 Sep 2023 18:55:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1694656544; x=1695261344; darn=lists.ozlabs.org; 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=5olfKKfAgOBEIWorNeGA6oMvbpwHV/k+KeYKQRUdq04=; b=axl1EC0JTYnMQHtT/MWO7/QkcJGXgGp7lw+Ow/LgG/Z+g62nG1M0TwXetgJv3c3zyA jL4wsV4rK6VbXnawrD9T+9xl/mN3wsGFFOLfqCxDkR1zVKm2BPTpYh6M//pFkhKCGG5I aOHELyN7o7wcn986/UHnNbdUrvebAtvKIqzLI4UOqvpU25csdWGbIq/vWPD659q/k1Bl izb0GSq64rGlZPsNKxFWtwOv+FpUkOuoCmca3sH4P4EFb3Gw5Oy4qdMJJKhv0N9aApRn 1LxN/urzbN5gtsH8ymZ1W87iVuoFx5L5tn84TG3BDEl3DY1TTHprELnZUnLbjR5rsmbL kY4g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694656544; x=1695261344; 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=5olfKKfAgOBEIWorNeGA6oMvbpwHV/k+KeYKQRUdq04=; b=QsGj/Q1gDLJ2FQp9JCusylZb41J+JbnVqM5JSPXvB5wiFGWmbDhMg73EaSnVP/yndx wodPKenQ/BTy7qaoQzscUqWM3B/nkXFKdS0Ym3Vk81c3cefCf43mIXSmBcGZsnzWMFBF jhYyT+6xVHwLYXzQEi0RWe5zrGdCMrJ1Ae98OcgnyVI0iEJebBQ/F7nWwP4cxdqceWXw 55SjfXJzCwQHeYtZnKj4zA9vSHGbFI+QCRubNuJgb+BfEpr4tTSI+EAwUSsOcTUpV/3f Hy6AWFVdyMU5U/v8flDdoBjq1lAyYrXd141SbyIrw2mRqrkXZBC55rb34gTs580b6Cu5 AeBA== X-Gm-Message-State: AOJu0YzsVFEHA3b4RgTNRLn7ViXkbzjTNvW8pnj2yWJEYmBNLdQLnlBg 5z8SgEzPHWOE3SMPf1OTkh+O3WweZbk= X-Google-Smtp-Source: AGHT+IFAWDIKY3pID0CrDZgtjj2bXptPteu0k42w51y6Ps+oH46knUj2OnzhEQTEbd0IbAu5MzXei5K4JBI= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a05:6902:684:b0:d81:8e4d:b681 with SMTP id i4-20020a056902068400b00d818e4db681mr15248ybt.12.1694656543919; Wed, 13 Sep 2023 18:55:43 -0700 (PDT) Date: Wed, 13 Sep 2023 18:55:02 -0700 In-Reply-To: <20230914015531.1419405-1-seanjc@google.com> Mime-Version: 1.0 References: <20230914015531.1419405-1-seanjc@google.com> X-Mailer: git-send-email 2.42.0.283.g2d96d420d3-goog Message-ID: <20230914015531.1419405-5-seanjc@google.com> Subject: [RFC PATCH v12 04/33] KVM: PPC: Return '1' unconditionally for KVM_CAP_SYNC_MMU From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Oliver Upton , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Sean Christopherson , "Matthew Wilcox (Oracle)" , Andrew Morton , Paul Moore , James Morris , "Serge E. Hallyn" Content-Type: text/plain; charset="UTF-8" X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Sean Christopherson Cc: kvm@vger.kernel.org, David Hildenbrand , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Chao Peng , linux-riscv@lists.infradead.org, Isaku Yamahata , linux-security-module@vger.kernel.org, Wang , Fuad Tabba , linux-arm-kernel@lists.infradead.org, Maciej Szmigiero , Michael Roth , Ackerley Tng , kvmarm@lists.linux.dev, Vlastimil Babka , Isaku Yamahata , Quentin Perret , linux-mips@vger.kernel.org, Jarkko Sakkinen , Yu Zhang , "Kirill A . Shutemov" , kvm-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, Liam Merwick , Vishal Annapurve , linuxppc-dev@lists.ozlabs.org, Xu Yilun , Ani sh Moorthy Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Advertise that KVM's MMU is synchronized with the primary MMU for all flavors of PPC KVM support, i.e. advertise that the MMU is synchronized when CONFIG_KVM_BOOK3S_HV_POSSIBLE=y but the VM is not using hypervisor mode (a.k.a. PR VMs). PR VMs, via kvm_unmap_gfn_range_pr(), do the right thing for mmu_notifier invalidation events, and more tellingly, KVM returns '1' for KVM_CAP_SYNC_MMU when CONFIG_KVM_BOOK3S_HV_POSSIBLE=n and CONFIG_KVM_BOOK3S_PR_POSSIBLE=y, i.e. KVM already advertises a synchronized MMU for PR VMs, just not when CONFIG_KVM_BOOK3S_HV_POSSIBLE=y. Suggested-by: Paolo Bonzini Signed-off-by: Sean Christopherson --- arch/powerpc/kvm/powerpc.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index b0a512ede764..8d3ec483bc2b 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -635,11 +635,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) #if !defined(CONFIG_MMU_NOTIFIER) || !defined(KVM_ARCH_WANT_MMU_NOTIFIER) BUILD_BUG(); #endif -#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE - r = hv_enabled; -#else r = 1; -#endif break; #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE case KVM_CAP_PPC_HTAB_FD: -- 2.42.0.283.g2d96d420d3-goog