From nobody Tue Apr 7 21:48:17 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1773241964; cv=none; d=zohomail.com; s=zohoarc; b=PE9dFlTRJkebLNc1IYUsm/3VtXvP/Q9+QPcD3RqAEVhwC+pYK/6RxOg1AFrMulX2jlFrmUDamTdRBLzZDbfgZ1tJRDPU8pvMe6Mh6b1+vU4ScE6ByWit+9/3bpa06+goGu+aFumGoI4kGTpONd9PWuul5sQaUvhyZ07UUNM8tO0= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1773241964; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=LGBzhSxs7BJypmw3ue6N+biErV7GblT/jEQwd7fPFvU=; b=g+nSABqC6BdfFPzGUFT/FjH96NShn2y/ZOIAwgKa2qdURqSe3x8yQFNgsaXdDQY/gndeg5NLEfBxYzoMBjoeYuBTjcPP8Cvl+NzfDC9wm4TXEkJA66SGBkpDa5JGLZJIMu6JEqJCxKTrH5yh3kyuTQlg4Qgq9kHL8rDCUbXhEgg= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1773241964222271.29762762416897; Wed, 11 Mar 2026 08:12:44 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1w0LBk-0001B7-VS; Wed, 11 Mar 2026 11:09:33 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1w0L8l-0003Pa-KX; Wed, 11 Mar 2026 11:06:27 -0400 Received: from isrv.corpit.ru ([212.248.84.144]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1w0L8j-0004nn-B4; Wed, 11 Mar 2026 11:06:27 -0400 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id 6FFB0191E69; Wed, 11 Mar 2026 18:01:46 +0300 (MSK) Received: from think4mjt.tls.msk.ru (mjtthink.wg.tls.msk.ru [192.168.177.146]) by tsrv.corpit.ru (Postfix) with ESMTP id 5BEC937C2BB; Wed, 11 Mar 2026 18:02:24 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=tls.msk.ru; s=202602; t=1773241306; bh=EvXZ/BWz1i2r9aDeNNCZTHrXhtgOfDxjw5qN58btyc8=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=oNDNaxIFya/qgZGx2yPQ91x/1/cvzkaumJjaJxSHc5Tkjq6zviFf2QtSw0dmBCgn6 PNuvVtV7/aL85Lv1S4kF1ULyDOlV62Ao6mv6EOE8USYI2/LYPQ0bDWsJvuq1TDQErr tK27NthUzIvMHT1fp7Sm8TGkPc1Ax1WLSGk/0cfdsp+zYctiTpQNjNfQH1OdH/lpv1 OWiqn5YEGpOUXveuV99hZVzl2YboeY/2WNdxBafJf3SbPHlcBNCePfnLEy51VYYqym v1sPOLXXctk9yhNn2RyX9tdm3TLlApyBtjClIi7sYvBgLyRXhXw6GCJHsL0EzqDm+g 6YAQ9IWTg9dYQ== From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, rail5 , Bibo Mao , Song Gao , Michael Tokarev Subject: [Stable-10.0.9 43/44] target/loongarch: Preserve PTE permission bits in LDPTE Date: Wed, 11 Mar 2026 18:02:15 +0300 Message-ID: <20260311150221.1084186-43-mjt@tls.msk.ru> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=212.248.84.144; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -2 X-Spam_score: -0.3 X-Spam_bar: / X-Spam_report: (-0.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.819, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.903, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @tls.msk.ru) X-ZM-MESSAGEID: 1773241965451154100 Content-Type: text/plain; charset="utf-8" From: rail5 The LDPTE helper loads a page table entry (or huge page entry) from guest memory and currently applies the PALEN mask to the whole 64-bit value. That mask is intended to constrain the physical address bits, but masking the full entry also clears upper permission bits in the PTE, including NX (bit 62). As a result, LoongArch TCG can incorrectly allow instruction fetches from NX mappings when translation is driven through software page-walk. Fix this by masking only the PPN/address field with PALEN while preserving permission bits, and by clearing any non-architectural (software) bits using a hardware PTE mask. LDDIR is unchanged since it returns the base address of the next page table level. Reported at: https://gitlab.com/qemu-project/qemu/-/issues/3319 Fixes: 56599a705f2 ("target/loongarch: Introduce loongarch_palen_mask()") Cc: qemu-stable@nongnu.org Signed-off-by: rail5 (Andrew S. Rightenburg) Reviewed-by: Bibo Mao Reviewed-by: Song Gao Signed-off-by: Song Gao (cherry picked from commit 2d877bc02a3b94998cbdd784d194c173d308a98a) (Mjt: backport to 10.0.x which lacks v10.2.0-1568-g56599a705f "target/loongarch: Introduce loongarch_palen_mask()") Signed-off-by: Michael Tokarev diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c index 364db7fab8..84b86da308 100644 --- a/target/loongarch/cpu.c +++ b/target/loongarch/cpu.c @@ -554,6 +554,17 @@ static void loongarch_cpu_reset_hold(Object *obj, Rese= tType type) =20 #ifdef CONFIG_TCG env->fcsr0_mask =3D FCSR0_M1 | FCSR0_M2 | FCSR0_M3; + + if (is_la64(env)) { + env->hw_pte_mask =3D MAKE_64BIT_MASK(0, 9) | + R_TLBENTRY_64_PPN_MASK | + R_TLBENTRY_64_NR_MASK | + R_TLBENTRY_64_NX_MASK | + R_TLBENTRY_64_RPLV_MASK; + } else { + env->hw_pte_mask =3D MAKE_64BIT_MASK(0, 9) | + R_TLBENTRY_32_PPN_MASK; + } #endif env->fcsr0 =3D 0x0; =20 diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h index ab76a0b451..a9bd969b85 100644 --- a/target/loongarch/cpu.h +++ b/target/loongarch/cpu.h @@ -378,6 +378,7 @@ typedef struct CPUArchState { uint32_t fcsr0_mask; uint64_t lladdr; /* LL virtual address compared against SC */ uint64_t llval; + uint64_t hw_pte_mask; /* Mask of architecturally-defined (hardware) PT= E bits. */ #endif #ifndef CONFIG_USER_ONLY #ifdef CONFIG_TCG diff --git a/target/loongarch/tcg/tlb_helper.c b/target/loongarch/tcg/tlb_h= elper.c index 70d1b5cf99..e71faa6ce8 100644 --- a/target/loongarch/tcg/tlb_helper.c +++ b/target/loongarch/tcg/tlb_helper.c @@ -539,6 +539,20 @@ bool loongarch_cpu_tlb_fill(CPUState *cs, vaddr addres= s, int size, cpu_loop_exit_restore(cs, retaddr); } =20 +static inline uint64_t loongarch_sanitize_hw_pte(CPULoongArchState *env, + uint64_t pte) +{ + uint64_t ppn_mask =3D is_la64(env) ? R_TLBENTRY_64_PPN_MASK : R_TLBENT= RY_32_PPN_MASK; + + /* + * Keep only architecturally-defined PTE bits. Guests may use some + * otherwise-unused bits for software purposes. + */ + pte &=3D env->hw_pte_mask; + + return (pte & ~ppn_mask) | ((pte & ppn_mask) & TARGET_PHYS_MASK); +} + target_ulong helper_lddir(CPULoongArchState *env, target_ulong base, target_ulong level, uint32_t mem_idx) { @@ -579,6 +593,7 @@ void helper_ldpte(CPULoongArchState *env, target_ulong = base, target_ulong odd, { CPUState *cs =3D env_cpu(env); target_ulong phys, tmp0, ptindex, ptoffset0, ptoffset1, ps, badv; + uint64_t pte_raw; uint64_t ptbase =3D FIELD_EX64(env->CSR_PWCL, CSR_PWCL, PTBASE); uint64_t ptwidth =3D FIELD_EX64(env->CSR_PWCL, CSR_PWCL, PTWIDTH); uint64_t dir_base, dir_width; @@ -590,7 +605,6 @@ void helper_ldpte(CPULoongArchState *env, target_ulong = base, target_ulong odd, * and the other is the huge page entry, * whose bit 6 should be 1. */ - base =3D base & TARGET_PHYS_MASK; if (FIELD_EX64(base, TLBENTRY, HUGE)) { /* * Gets the huge page level and Gets huge page size. @@ -614,19 +628,22 @@ void helper_ldpte(CPULoongArchState *env, target_ulon= g base, target_ulong odd, * when loaded into the tlb, * so the tlb page size needs to be divided by 2. */ - tmp0 =3D base; + tmp0 =3D loongarch_sanitize_hw_pte(env, base); if (odd) { tmp0 +=3D MAKE_64BIT_MASK(ps, 1); } } else { badv =3D env->CSR_TLBRBADV; =20 + base =3D base & TARGET_PHYS_MASK; + ptindex =3D (badv >> ptbase) & ((1 << ptwidth) - 1); ptindex =3D ptindex & ~0x1; /* clear bit 0 */ ptoffset0 =3D ptindex << 3; ptoffset1 =3D (ptindex + 1) << 3; phys =3D base | (odd ? ptoffset1 : ptoffset0); - tmp0 =3D ldq_phys(cs->as, phys) & TARGET_PHYS_MASK; + pte_raw =3D ldq_le_phys(cs->as, phys); + tmp0 =3D loongarch_sanitize_hw_pte(env, pte_raw); ps =3D ptbase; } =20 --=20 2.47.3