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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D44CCC6FA99 for ; Sun, 12 Mar 2023 18:01:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231463AbjCLSBa (ORCPT ); Sun, 12 Mar 2023 14:01:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34664 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229774AbjCLSAy (ORCPT ); Sun, 12 Mar 2023 14:00:54 -0400 Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CA49E2718; Sun, 12 Mar 2023 10:58:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1678643924; x=1710179924; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=ShABbm7lO3qxe/GYr0GPDXY4m17G9UZ2fcdTJd3X8rI=; b=BgmPIedhPByRDvpueC6V5eCR9U14X3Agsknkmf3BrVy2o0JErwQfX3La fRi9AabamgODSt1S5VxepaNAE8EGiC+PTVWpEbFz7G/hZZLsb5Vk5qoTx GwQXmZfq2vQLBVNOZd1bmmMyRVB29fNCbzgXEvzVPSkjwo7O5nAf+RpvG cPPjvSH5goK5uyf8ONN9XmcHDqi4V2Y4u4mglJgT9FtBStKMSF63Gz+yo zNGfSdkr78/L9sDZtb0Gi8yfuiwCbizpz3N/lOPOSI4qHZ3/yvfiE8B/x AMHQRMi5gwvDKvkPfcGqVwOzDGjml59TH8xyLRB+/baahg3iRXpObiWXX Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10647"; a="320863654" X-IronPort-AV: E=Sophos;i="5.98,254,1673942400"; d="scan'208";a="320863654" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Mar 2023 10:57:59 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10647"; a="628397013" X-IronPort-AV: E=Sophos;i="5.98,254,1673942400"; d="scan'208";a="628397013" Received: from ls.sc.intel.com (HELO localhost) ([143.183.96.54]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Mar 2023 10:57:59 -0700 From: isaku.yamahata@intel.com To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: isaku.yamahata@intel.com, isaku.yamahata@gmail.com, Paolo Bonzini , erdemaktas@google.com, Sean Christopherson , Sagi Shahar , David Matlack , Kai Huang , Zhi Wang , Rick Edgecombe Subject: [PATCH v13 028/113] KVM: x86/mmu: Add address conversion functions for TDX shared bit of GPA Date: Sun, 12 Mar 2023 10:55:52 -0700 Message-Id: <140280f19bfce7630d7d35bdd69ea5c6b6bdf2db.1678643052.git.isaku.yamahata@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Isaku Yamahata TDX repurposes one GPA bit (51 bit or 47 bit based on configuration) to indicate the GPA is private(if cleared) or shared (if set) with VMM. If GPA.shared is set, GPA is covered by the existing conventional EPT pointed by EPTP. If GPA.shared bit is cleared, GPA is covered by TDX module. VMM has to issue SEAMCALLs to operate. Add a member to remember GPA shared bit for each guest TDs, add address conversion functions between private GPA and shared GPA and test if GPA is private. Because struct kvm_arch (or struct kvm which includes struct kvm_arch. See kvm_arch_alloc_vm() that passes __GPF_ZERO) is zero-cleared when allocated, the new member to remember GPA shared bit is guaranteed to be zero with this patch unless it's initialized explicitly. Co-developed-by: Rick Edgecombe Signed-off-by: Rick Edgecombe Signed-off-by: Isaku Yamahata --- arch/x86/include/asm/kvm_host.h | 4 ++++ arch/x86/kvm/mmu.h | 27 +++++++++++++++++++++++++++ arch/x86/kvm/vmx/tdx.c | 5 +++++ 3 files changed, 36 insertions(+) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 42fa696a04ea..1802ee8bf1ad 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1463,6 +1463,10 @@ struct kvm_arch { */ #define SPLIT_DESC_CACHE_MIN_NR_OBJECTS (SPTE_ENT_PER_PAGE + 1) struct kvm_mmu_memory_cache split_desc_cache; + +#ifdef CONFIG_KVM_MMU_PRIVATE + gfn_t gfn_shared_mask; +#endif }; struct kvm_vm_stat { diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h index 168c46fd8dd1..34a7266f145f 100644 --- a/arch/x86/kvm/mmu.h +++ b/arch/x86/kvm/mmu.h @@ -278,4 +278,31 @@ static inline gpa_t kvm_translate_gpa(struct kvm_vcpu *vcpu, return gpa; return translate_nested_gpa(vcpu, gpa, access, exception); } + +static inline gfn_t kvm_gfn_shared_mask(const struct kvm *kvm) +{ +#ifdef CONFIG_KVM_MMU_PRIVATE + return kvm->arch.gfn_shared_mask; +#else + return 0; +#endif +} + +static inline gfn_t kvm_gfn_to_shared(const struct kvm *kvm, gfn_t gfn) +{ + return gfn | kvm_gfn_shared_mask(kvm); +} + +static inline gfn_t kvm_gfn_to_private(const struct kvm *kvm, gfn_t gfn) +{ + return gfn & ~kvm_gfn_shared_mask(kvm); +} + +static inline bool kvm_is_private_gpa(const struct kvm *kvm, gpa_t gpa) +{ + gfn_t mask = kvm_gfn_shared_mask(kvm); + + return mask && !(gpa_to_gfn(gpa) & mask); +} + #endif diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index 1415ab60ce2c..1994f4463fd8 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -826,6 +826,11 @@ static int tdx_td_init(struct kvm *kvm, struct kvm_tdx_cmd *cmd) kvm_tdx->attributes = td_params->attributes; kvm_tdx->xfam = td_params->xfam; + if (td_params->exec_controls & TDX_EXEC_CONTROL_MAX_GPAW) + kvm->arch.gfn_shared_mask = gpa_to_gfn(BIT_ULL(51)); + else + kvm->arch.gfn_shared_mask = gpa_to_gfn(BIT_ULL(47)); + out: /* kfree() accepts NULL. */ kfree(init_vm); -- 2.25.1