From patchwork Wed Jun 19 22:36:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rick Edgecombe X-Patchwork-Id: 13704664 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 3E83415FA96; Wed, 19 Jun 2024 22:36:30 +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=1718836592; cv=none; b=PL9yMrbb+Vj8p+qZlqPaoaLU+zrlKHyTqpd+ciLOIOVmxu8CaKLq1jMnfFlQlc02Gj/ISj6g/dFARj4aOEt28W6He47jwh5ocTY0NFeywTXbxzv7Q8mL1uRF9aGr6Zx/GQSvq/KKlFy4AjA1Y+mkHIgHAsumKhR4MB86R85JgfY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718836592; c=relaxed/simple; bh=3gBvRGkOGVwhZS+k6E07I4RJRyMHRxT6vEJpGlKab34=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=sAj+aRU2U0QjJy3bR6TYeggyaPGqHyHOsAPE7rvrp0Nxh3AZUxOgszLXxO9eILRl2VKbRPEAaOe3Xu8XGdie49DQyTWYXWwYZQIO4DWo6UdgwEztkNqlnbipfSwzEFs5x/kWf6+X3B8rId5LIUmDbh9Vz9H6nh3mFL1diQBRNS4= 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=U/wf7ux+; 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="U/wf7ux+" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1718836590; x=1750372590; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=3gBvRGkOGVwhZS+k6E07I4RJRyMHRxT6vEJpGlKab34=; b=U/wf7ux+L2Hr8cweNQ2Pp3+QhPx50Cm8OTCYLe5EZqoJTYZHLaxbSFcP LtTMrUTkAjvdmJ1IAXUN1dp1fLepmOCGPYrZMotjC6r94STzh/wCML66r 8nZgS/qOkeYPCDdO95gnT8xN6QCp4BtejEpFrPEEAvztprBsSH1GIq5CJ 9p8Jy9JVt1li+QLSt9rczECZNQRLOYg6M6LTDmcbfiCSgvvl19DGG8OWC gTvhuV79r0TjqoV0gXfZeiCEWGVYpZlCVSzkGjIaLlgKNg7m0A0brUAdb 397HmKNxgnfqmTLH+g+fWz6dmzdagVYzYBNJNiCAHr03QhvWfWg7Y2oHT Q==; X-CSE-ConnectionGUID: klG2lcOGTvqy6I30F8MECw== X-CSE-MsgGUID: 9rx3pUWES06zZ8WA6+W7vA== X-IronPort-AV: E=McAfee;i="6700,10204,11108"; a="15931977" X-IronPort-AV: E=Sophos;i="6.08,251,1712646000"; d="scan'208";a="15931977" 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 15:36:23 -0700 X-CSE-ConnectionGUID: 378aBVdAQ/+wfQ7Gn2/D3Q== X-CSE-MsgGUID: iaXJ28PWQHO0FyA73C5bYg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,251,1712646000"; d="scan'208";a="72793356" 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 15:36:22 -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, Isaku Yamahata Subject: [PATCH v3 11/17] KVM: x86/tdp_mmu: Introduce KVM MMU root types to specify page table type Date: Wed, 19 Jun 2024 15:36:08 -0700 Message-Id: <20240619223614.290657-12-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 From: Isaku Yamahata Define an enum kvm_tdp_mmu_root_types to specify the KVM MMU root type [1] so that the iterator on the root page table can consistently filter the root page table type instead of only_valid. TDX KVM will operate on KVM page tables with specified types. Shared page table, private page table, or both. Introduce an enum instead of bool only_valid so that we can easily enhance page table types applicable to shared, private, or both in addition to valid or not. Replace only_valid=false with KVM_ANY_ROOTS and only_valid=true with KVM_ANY_VALID_ROOTS. Use KVM_ANY_ROOTS and KVM_ANY_VALID_ROOTS to wrap KVM_VALID_ROOTS to avoid further code churn when direct vs mirror root concepts are introduced in future patches. Link: https://lore.kernel.org/kvm/ZivazWQw1oCU8VBC@google.com/ [1] Suggested-by: Sean Christopherson Signed-off-by: Isaku Yamahata Signed-off-by: Rick Edgecombe --- TDX MMU Prep v3: - Drop KVM_ANY_ROOTS, KVM_ANY_VALID_ROOTS and switch to KVM_VALID_ROOTS and KVM_ALL_ROOTS. (Paolo) TDX MMU Prep: - Newly introduced. --- arch/x86/kvm/mmu/tdp_mmu.c | 41 +++++++++++++++++++------------------- arch/x86/kvm/mmu/tdp_mmu.h | 7 +++++++ 2 files changed, 28 insertions(+), 20 deletions(-) diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index cecc25947001..c8e5e779967e 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -92,27 +92,28 @@ void kvm_tdp_mmu_put_root(struct kvm *kvm, struct kvm_mmu_page *root) call_rcu(&root->rcu_head, tdp_mmu_free_sp_rcu_callback); } -static bool tdp_mmu_root_match(struct kvm_mmu_page *root, bool only_valid) +static bool tdp_mmu_root_match(struct kvm_mmu_page *root, + enum kvm_tdp_mmu_root_types types) { - if (only_valid && root->role.invalid) - return false; + if (root->role.invalid) + return types & KVM_INVALID_ROOTS; return true; } /* * Returns the next root after @prev_root (or the first root if @prev_root is - * NULL). A reference to the returned root is acquired, and the reference to - * @prev_root is released (the caller obviously must hold a reference to - * @prev_root if it's non-NULL). + * NULL) that matches with @types. A reference to the returned root is + * acquired, and the reference to @prev_root is released (the caller obviously + * must hold a reference to @prev_root if it's non-NULL). * - * If @only_valid is true, invalid roots are skipped. + * Roots that doesn't match with @types are skipped. * * Returns NULL if the end of tdp_mmu_roots was reached. */ static struct kvm_mmu_page *tdp_mmu_next_root(struct kvm *kvm, struct kvm_mmu_page *prev_root, - bool only_valid) + enum kvm_tdp_mmu_root_types types) { struct kvm_mmu_page *next_root; @@ -133,7 +134,7 @@ static struct kvm_mmu_page *tdp_mmu_next_root(struct kvm *kvm, typeof(*next_root), link); while (next_root) { - if (tdp_mmu_root_match(next_root, only_valid) && + if (tdp_mmu_root_match(next_root, types) && kvm_tdp_mmu_get_root(next_root)) break; @@ -158,20 +159,20 @@ static struct kvm_mmu_page *tdp_mmu_next_root(struct kvm *kvm, * If shared is set, this function is operating under the MMU lock in read * mode. */ -#define __for_each_tdp_mmu_root_yield_safe(_kvm, _root, _as_id, _only_valid) \ - for (_root = tdp_mmu_next_root(_kvm, NULL, _only_valid); \ +#define __for_each_tdp_mmu_root_yield_safe(_kvm, _root, _as_id, _types) \ + for (_root = tdp_mmu_next_root(_kvm, NULL, _types); \ ({ lockdep_assert_held(&(_kvm)->mmu_lock); }), _root; \ - _root = tdp_mmu_next_root(_kvm, _root, _only_valid)) \ + _root = tdp_mmu_next_root(_kvm, _root, _types)) \ if (_as_id >= 0 && kvm_mmu_page_as_id(_root) != _as_id) { \ } else #define for_each_valid_tdp_mmu_root_yield_safe(_kvm, _root, _as_id) \ - __for_each_tdp_mmu_root_yield_safe(_kvm, _root, _as_id, true) + __for_each_tdp_mmu_root_yield_safe(_kvm, _root, _as_id, KVM_VALID_ROOTS) #define for_each_tdp_mmu_root_yield_safe(_kvm, _root) \ - for (_root = tdp_mmu_next_root(_kvm, NULL, false); \ + for (_root = tdp_mmu_next_root(_kvm, NULL, KVM_ALL_ROOTS); \ ({ lockdep_assert_held(&(_kvm)->mmu_lock); }), _root; \ - _root = tdp_mmu_next_root(_kvm, _root, false)) + _root = tdp_mmu_next_root(_kvm, _root, KVM_ALL_ROOTS)) /* * Iterate over all TDP MMU roots. Requires that mmu_lock be held for write, @@ -180,18 +181,18 @@ static struct kvm_mmu_page *tdp_mmu_next_root(struct kvm *kvm, * Holding mmu_lock for write obviates the need for RCU protection as the list * is guaranteed to be stable. */ -#define __for_each_tdp_mmu_root(_kvm, _root, _as_id, _only_valid) \ +#define __for_each_tdp_mmu_root(_kvm, _root, _as_id, _types) \ list_for_each_entry(_root, &_kvm->arch.tdp_mmu_roots, link) \ if (kvm_lockdep_assert_mmu_lock_held(_kvm, false) && \ ((_as_id >= 0 && kvm_mmu_page_as_id(_root) != _as_id) || \ - !tdp_mmu_root_match((_root), (_only_valid)))) { \ + !tdp_mmu_root_match((_root), (_types)))) { \ } else #define for_each_tdp_mmu_root(_kvm, _root, _as_id) \ - __for_each_tdp_mmu_root(_kvm, _root, _as_id, false) + __for_each_tdp_mmu_root(_kvm, _root, _as_id, KVM_ALL_ROOTS) #define for_each_valid_tdp_mmu_root(_kvm, _root, _as_id) \ - __for_each_tdp_mmu_root(_kvm, _root, _as_id, true) + __for_each_tdp_mmu_root(_kvm, _root, _as_id, KVM_VALID_ROOTS) static struct kvm_mmu_page *tdp_mmu_alloc_sp(struct kvm_vcpu *vcpu) { @@ -1197,7 +1198,7 @@ bool kvm_tdp_mmu_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range, { struct kvm_mmu_page *root; - __for_each_tdp_mmu_root_yield_safe(kvm, root, range->slot->as_id, false) + __for_each_tdp_mmu_root_yield_safe(kvm, root, range->slot->as_id, KVM_ALL_ROOTS) flush = tdp_mmu_zap_leafs(kvm, root, range->start, range->end, range->may_block, flush); diff --git a/arch/x86/kvm/mmu/tdp_mmu.h b/arch/x86/kvm/mmu/tdp_mmu.h index 1ba84487f3b7..b887c225ff24 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.h +++ b/arch/x86/kvm/mmu/tdp_mmu.h @@ -19,6 +19,13 @@ __must_check static inline bool kvm_tdp_mmu_get_root(struct kvm_mmu_page *root) void kvm_tdp_mmu_put_root(struct kvm *kvm, struct kvm_mmu_page *root); +enum kvm_tdp_mmu_root_types { + KVM_INVALID_ROOTS = BIT(0), + + KVM_VALID_ROOTS = BIT(1), + KVM_ALL_ROOTS = KVM_VALID_ROOTS | KVM_INVALID_ROOTS, +}; + bool kvm_tdp_mmu_zap_leafs(struct kvm *kvm, gfn_t start, gfn_t end, bool flush); bool kvm_tdp_mmu_zap_sp(struct kvm *kvm, struct kvm_mmu_page *sp); void kvm_tdp_mmu_zap_all(struct kvm *kvm);