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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D6062CCA47B for ; Mon, 27 Jun 2022 22:01:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242385AbiF0WBg (ORCPT ); Mon, 27 Jun 2022 18:01:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59426 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241574AbiF0Vzr (ORCPT ); Mon, 27 Jun 2022 17:55:47 -0400 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 76EC413EBF; Mon, 27 Jun 2022 14:55:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1656366907; x=1687902907; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=kJUKMzgT8SnekcXjC1Tok9JmDm1LOJU3li+cNgtN/N4=; b=PdPSLAuiqWpH4NlYWw8Mvzk+45KLxvudZ3EYB8tAQ3XBEKnCA6rk3xPf 7jyfhy21pYmKKYid3qhKNiYe4xk4QT9ADuI6q9dFZesJyufhJc+mazyA0 VUuMUwB8pMlHn6lVewh4Ya126rTwd7UOC7gx3OKgnlPEPiZ6iVtKIVcIv FjetI46hcBn9Hw/7AY4TKF1k0iDbdADr/pfENTWjyD+rVbPJGpV3pNvc0 Fkh7bToYDpdYT64CHn8MhEtBSN8k6PGVxq+AocnF0J7/2SgXAs7t7R+Ik nWkF5KLazsBOVpW5JnI82ukrUNSinFZYEFGnswo4Xd91bZ0pMGjTtKyo2 w==; X-IronPort-AV: E=McAfee;i="6400,9594,10391"; a="279116132" X-IronPort-AV: E=Sophos;i="5.92,227,1650956400"; d="scan'208";a="279116132" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jun 2022 14:55:00 -0700 X-IronPort-AV: E=Sophos;i="5.92,227,1650956400"; d="scan'208";a="657863714" Received: from ls.sc.intel.com (HELO localhost) ([143.183.96.54]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jun 2022 14:55:00 -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 Subject: [PATCH v7 085/102] KVM: TDX: handle ept violation/misconfig exit Date: Mon, 27 Jun 2022 14:54:17 -0700 Message-Id: <31487c5f0b930f470c552c04b4e0d59dc80f78d6.1656366338.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 On EPT violation, call a common function, __vmx_handle_ept_violation() to trigger x86 MMU code. On EPT misconfiguration, exit to ring 3 with KVM_EXIT_UNKNOWN. because EPT misconfiguration can't happen as MMIO is trigged by TDG.VP.VMCALL. No point to set a misconfiguration value for the fast path. Signed-off-by: Isaku Yamahata --- arch/x86/kvm/vmx/tdx.c | 46 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index e5268bfa8d27..14f65d7b3824 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -1191,6 +1191,48 @@ void tdx_deliver_interrupt(struct kvm_lapic *apic, int delivery_mode, __vmx_deliver_posted_interrupt(vcpu, &tdx->pi_desc, vector); } +static int tdx_handle_ept_violation(struct kvm_vcpu *vcpu) +{ + unsigned long exit_qual; + + if (kvm_is_private_gpa(vcpu->kvm, tdexit_gpa(vcpu))) { + /* + * Always treat SEPT violations as write faults. Ignore the + * EXIT_QUALIFICATION reported by TDX-SEAM for SEPT violations. + * TD private pages are always RWX in the SEPT tables, + * i.e. they're always mapped writable. Just as importantly, + * treating SEPT violations as write faults is necessary to + * avoid COW allocations, which will cause TDAUGPAGE failures + * due to aliasing a single HPA to multiple GPAs. + */ +#define TDX_SEPT_VIOLATION_EXIT_QUAL EPT_VIOLATION_ACC_WRITE + exit_qual = TDX_SEPT_VIOLATION_EXIT_QUAL; + } else { + exit_qual = tdexit_exit_qual(vcpu);; + if (exit_qual & EPT_VIOLATION_ACC_INSTR) { + pr_warn("kvm: TDX instr fetch to shared GPA = 0x%lx @ RIP = 0x%lx\n", + tdexit_gpa(vcpu), kvm_rip_read(vcpu)); + vcpu->run->exit_reason = KVM_EXIT_EXCEPTION; + vcpu->run->ex.exception = PF_VECTOR; + vcpu->run->ex.error_code = exit_qual; + return 0; + } + } + + trace_kvm_page_fault(tdexit_gpa(vcpu), exit_qual); + return __vmx_handle_ept_violation(vcpu, tdexit_gpa(vcpu), exit_qual); +} + +static int tdx_handle_ept_misconfig(struct kvm_vcpu *vcpu) +{ + WARN_ON(1); + + vcpu->run->exit_reason = KVM_EXIT_UNKNOWN; + vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_MISCONFIG; + + return 0; +} + int tdx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t fastpath) { union tdx_exit_reason exit_reason = to_tdx(vcpu)->exit_reason; @@ -1209,6 +1251,10 @@ int tdx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t fastpath) WARN_ON_ONCE(fastpath != EXIT_FASTPATH_NONE); switch (exit_reason.basic) { + case EXIT_REASON_EPT_VIOLATION: + return tdx_handle_ept_violation(vcpu); + case EXIT_REASON_EPT_MISCONFIG: + return tdx_handle_ept_misconfig(vcpu); case EXIT_REASON_OTHER_SMI: /* * If reach here, it's not a Machine Check System Management -- 2.25.1