From patchwork Wed Jun 19 22:36:03 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Edgecombe, Rick P" X-Patchwork-Id: 13704658 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.18]) (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 79ECB15B541; Wed, 19 Jun 2024 22:36:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.18 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718836588; cv=none; b=HvQg4MIECV/PWP5OAxoDvV7mQWq7CU8YX9x0YnjG3Wu1gxWYA5ZOIKsz5eMRzji3CyeSpwMlU/+BiWNrg2BaQgviiDpBqTZI3Sr2a5MbdzZnkL/T0ZGJ8D9exJhC34zlGmPZzOx3uywq6mwzt9U1KJ2/iF08ngC8otxogLOTamE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718836588; c=relaxed/simple; bh=yDbz8LgSURR5PSzpxuXHfQKkHmHCkhHdnFkVmC/D5YQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=aX+8GAiLpr8adKl+5v3ailpdQ63Z+UeyRLKCe5pcH6QDoP0tvLhxbCw8mHq2R9yb9WDDPb5YlnqmOEXpG9T2O3UdPvKrxMEwz/t0AjxuSsNAo8UltpIHjBXES+PIUc+SjqfKIzCI59n2/QR6DRoXbToRZf5QVQBIMpFFvTO7JAQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=Z86INrjj; arc=none smtp.client-ip=198.175.65.18 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="Z86INrjj" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1718836586; x=1750372586; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=yDbz8LgSURR5PSzpxuXHfQKkHmHCkhHdnFkVmC/D5YQ=; b=Z86INrjjh4bACaqE5HxiO63k5KGt34h69F/xoi0D7F3lSjt9UPXdS2IA 3CoBru11wDDRu4kSWfLjqJF01q4pUzoSXNahMvI0lkE9Fb5I/7hjZgDlp GkSJyk8ceB4zmKh2J0tMrAcpAdqLdHnuEMQdtQrDJp4jgOu/QRfPQTy5t 6BNMnNqrTUDkUGt7SGE5nNRNkssJG0vKzr22HbKY6rdREwenF9X1pO5NX 5mH6sc9D8tWC1E3dog8zGo7dkgwHLlvGfhiJtScE/fzJJq/9cWcxGLzQn cUXyxCokGnUhhcPboPB3SNSrALqmKhI2Ig6QZ0qKPDAQXmV2C3F5/ErHr g==; X-CSE-ConnectionGUID: 1vA48aL3QeWYBZLpu8AJSw== X-CSE-MsgGUID: nADY+JWkTo2cf1jMhoIYrA== X-IronPort-AV: E=McAfee;i="6700,10204,11108"; a="15931951" X-IronPort-AV: E=Sophos;i="6.08,251,1712646000"; d="scan'208";a="15931951" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by orvoesa110.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Jun 2024 15:36:21 -0700 X-CSE-ConnectionGUID: lPtdsyU4TnK+1ZhKMJR2ug== X-CSE-MsgGUID: JLYqCEFJT0uUk3zALBZfSg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,251,1712646000"; d="scan'208";a="72793336" Received: from ivsilic-mobl2.amr.corp.intel.com (HELO rpedgeco-desk4.intel.com) ([10.209.54.39]) by orviesa002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Jun 2024 15:36:21 -0700 From: Rick Edgecombe To: seanjc@google.com, pbonzini@redhat.com, kvm@vger.kernel.org Cc: kai.huang@intel.com, dmatlack@google.com, erdemaktas@google.com, isaku.yamahata@gmail.com, linux-kernel@vger.kernel.org, sagis@google.com, yan.y.zhao@intel.com, rick.p.edgecombe@intel.com Subject: [PATCH v3 06/17] KVM: x86/mmu: Make kvm_tdp_mmu_alloc_root() return void Date: Wed, 19 Jun 2024 15:36:03 -0700 Message-Id: <20240619223614.290657-7-rick.p.edgecombe@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240619223614.290657-1-rick.p.edgecombe@intel.com> References: <20240619223614.290657-1-rick.p.edgecombe@intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The kvm_tdp_mmu_alloc_root() function currently always returns 0. This allows for the caller, mmu_alloc_direct_roots(), to call kvm_tdp_mmu_alloc_root() and also return 0 in one line: return kvm_tdp_mmu_alloc_root(vcpu); So it is useful even though the return value of kvm_tdp_mmu_alloc_root() is always the same. However, in future changes, kvm_tdp_mmu_alloc_root() will be called twice in mmu_alloc_direct_roots(). This will force the first call to either awkwardly handle the return value that will always be zero or ignore it. So change kvm_tdp_mmu_alloc_root() to return void. Do it in a separate change so the future change will be cleaner. Signed-off-by: Rick Edgecombe Reviewed-by: Paolo Bonzini --- TDX MMU Prep v3: - Add Paolo's reviewed-by TDX MMU Prep: - New patch --- arch/x86/kvm/mmu/mmu.c | 6 ++++-- arch/x86/kvm/mmu/tdp_mmu.c | 3 +-- arch/x86/kvm/mmu/tdp_mmu.h | 2 +- 3 files changed, 6 insertions(+), 5 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 8023cebeefaa..138e7bbcda1e 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -3700,8 +3700,10 @@ static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu) unsigned i; int r; - if (tdp_mmu_enabled) - return kvm_tdp_mmu_alloc_root(vcpu); + if (tdp_mmu_enabled) { + kvm_tdp_mmu_alloc_root(vcpu); + return 0; + } write_lock(&vcpu->kvm->mmu_lock); r = make_mmu_pages_available(vcpu); diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index 35249555b585..07b0b884e246 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -224,7 +224,7 @@ static void tdp_mmu_init_child_sp(struct kvm_mmu_page *child_sp, tdp_mmu_init_sp(child_sp, iter->sptep, iter->gfn, role); } -int kvm_tdp_mmu_alloc_root(struct kvm_vcpu *vcpu) +void kvm_tdp_mmu_alloc_root(struct kvm_vcpu *vcpu) { struct kvm_mmu *mmu = vcpu->arch.mmu; union kvm_mmu_page_role role = mmu->root_role; @@ -285,7 +285,6 @@ int kvm_tdp_mmu_alloc_root(struct kvm_vcpu *vcpu) */ mmu->root.hpa = __pa(root->spt); mmu->root.pgd = 0; - return 0; } static void handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn, diff --git a/arch/x86/kvm/mmu/tdp_mmu.h b/arch/x86/kvm/mmu/tdp_mmu.h index 58b55e61bd33..437ddd4937a9 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.h +++ b/arch/x86/kvm/mmu/tdp_mmu.h @@ -10,7 +10,7 @@ void kvm_mmu_init_tdp_mmu(struct kvm *kvm); void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm); -int kvm_tdp_mmu_alloc_root(struct kvm_vcpu *vcpu); +void kvm_tdp_mmu_alloc_root(struct kvm_vcpu *vcpu); __must_check static inline bool kvm_tdp_mmu_get_root(struct kvm_mmu_page *root) {