From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 8662433D4E9; Wed, 30 Sep 2026 16:46:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790786819; cv=none; b=l4Y2gXLJrPX8nYyhHGMXwNUAzV1FqL3Z61gZ/wKTZQSEDwRxSZj2g4Mqh9cbBfp9v/AXcGooyoIj47DksE9WCEkKniIPkb5ha+xMie0c2YUc7Y1uEON+6aINp23QmkWXCcn5qQGzQDfFre/+VJt4J8DTxB7gHyzny9Y+ZzxEDuk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790786819; c=relaxed/simple; bh=SzzYz0nLGgGwTtbdGr4SE3BbKeM1U2Rrp/JLJ0C9m+U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rgp8Ghb1G/Q5dzqcLSYyNUZHFOAYAM8G4uHbo/TMz2LsZ0/ABCcD1LJRtFNxiazh5UnpRm9BpQq92+FkUod+vFjpdfEW/LHDbm7nhiAu5M8jaMTg+EBdjmNEdEk+sYjQIKFVDSZ6dPNkGylBJhDJ0Dw1Tfh/PMw3sxO85XdWXF0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ZbmAwGzS; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ZbmAwGzS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E09C81F00893; Wed, 30 Sep 2026 16:46:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790786818; bh=SzYq7gzYKe629owZxBo2JYdokaK1y9kITBwDQDQvCIM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ZbmAwGzSq2ZN9iRTn6fEcJsKr8EWAtFRjoFN+hI3dNcj/BSR4M7/hEQK8B+78HwLZ ZG8UxfFnoZPWlOP3dkxeZiT+uHdEJQCFYqq7RrO7DHXZCKKTqZQTZqFaKvrQxtwPKx a8R1WH8SloCMznIGlJSOtN6Z7cPmkTlApH0rJi04= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Claudio Imbrenda , Sasha Levin Subject: [PATCH 7.2 006/457] KVM: s390: Fix dirty marking in adapter_indicators_set*() Date: Wed, 30 Sep 2026 17:21:51 +0200 Message-ID: <20260930152346.168707483@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152346.024115587@linuxfoundation.org> References: <20260930152346.024115587@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Claudio Imbrenda [ Upstream commit d215f014b3526a9898d87bfb4b866287f0864cc9 ] When the indicator and/or summary bits are set in the guest, the accessed page was only marked dirty in KVM if the access was performed using the slow path; accesses through the new kvm_arch_set_irq_inatomic fast inject path would not mark the page as dirty. Fix by adding/moving the missing calls to mark_page_dirty(). Note that for the inatomic path set_page_dirty{,_lock}() is not needed as the page stays pinned; the unpin path correctly marks it as dirty. Opportunistically reorder the local variables to be in reverse Christmas tree order and refactor to use guard(). Fixes: 1e95e3bc6b05 ("KVM: s390: Enable adapter_indicators_set to use mapped pages") Signed-off-by: Claudio Imbrenda Message-ID: <20260828115439.145885-2-imbrenda@linux.ibm.com> Signed-off-by: Sasha Levin --- arch/s390/kvm/interrupt.c | 75 ++++++++++++++++++++------------------- 1 file changed, 38 insertions(+), 37 deletions(-) diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index d33dd58f4a4fd..70431eb38aa50 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -2976,61 +2976,58 @@ static int adapter_indicators_set(struct kvm *kvm, struct s390_io_adapter *adapter, struct kvm_s390_adapter_int *adapter_int) { - unsigned long bit; - int summary_set, idx; struct s390_map_info *ind_info, *summary_info; - void *map; struct page *ind_page, *summary_page; - unsigned long flags; + unsigned long bit; + int summary_set; + void *map; ind_page = NULL; - spin_lock_irqsave(&adapter->maps_lock, flags); - ind_info = get_map_info(adapter, adapter_int->ind_addr); + scoped_guard(spinlock_irqsave, &adapter->maps_lock) { + ind_info = get_map_info(adapter, adapter_int->ind_addr); + if (ind_info) { + map = page_address(ind_info->page); + bit = get_ind_bit(ind_info->addr, adapter_int->ind_offset, adapter->swap); + set_bit(bit, map); + } + } if (!ind_info) { - spin_unlock_irqrestore(&adapter->maps_lock, flags); ind_page = pin_map_page(kvm, adapter_int->ind_addr, 0); if (!ind_page) return -1; - idx = srcu_read_lock(&kvm->srcu); map = page_address(ind_page); bit = get_ind_bit(adapter_int->ind_addr, adapter_int->ind_offset, adapter->swap); set_bit(bit, map); - mark_page_dirty(kvm, adapter_int->ind_gaddr >> PAGE_SHIFT); set_page_dirty_lock(ind_page); - srcu_read_unlock(&kvm->srcu, idx); unpin_user_page(ind_page); - } else { - map = page_address(ind_info->page); - bit = get_ind_bit(ind_info->addr, adapter_int->ind_offset, adapter->swap); - set_bit(bit, map); - spin_unlock_irqrestore(&adapter->maps_lock, flags); } + scoped_guard(srcu, &kvm->srcu) + mark_page_dirty(kvm, gpa_to_gfn(adapter_int->ind_gaddr)); - spin_lock_irqsave(&adapter->maps_lock, flags); - summary_info = get_map_info(adapter, adapter_int->summary_addr); + scoped_guard(spinlock_irqsave, &adapter->maps_lock) { + summary_info = get_map_info(adapter, adapter_int->summary_addr); + if (summary_info) { + map = page_address(summary_info->page); + bit = get_ind_bit(summary_info->addr, adapter_int->summary_offset, + adapter->swap); + summary_set = test_and_set_bit(bit, map); + } + } if (!summary_info) { - spin_unlock_irqrestore(&adapter->maps_lock, flags); summary_page = pin_map_page(kvm, adapter_int->summary_addr, 0); if (WARN_ON_ONCE(!summary_page)) return -1; - idx = srcu_read_lock(&kvm->srcu); map = page_address(summary_page); bit = get_ind_bit(adapter_int->summary_addr, adapter_int->summary_offset, adapter->swap); summary_set = test_and_set_bit(bit, map); - mark_page_dirty(kvm, adapter_int->summary_gaddr >> PAGE_SHIFT); set_page_dirty_lock(summary_page); - srcu_read_unlock(&kvm->srcu, idx); unpin_user_page(summary_page); - } else { - map = page_address(summary_info->page); - bit = get_ind_bit(summary_info->addr, adapter_int->summary_offset, - adapter->swap); - summary_set = test_and_set_bit(bit, map); - spin_unlock_irqrestore(&adapter->maps_lock, flags); } + scoped_guard(srcu, &kvm->srcu) + mark_page_dirty(kvm, gpa_to_gfn(adapter_int->summary_gaddr)); return summary_set ? 0 : 1; } @@ -3040,26 +3037,29 @@ static int adapter_indicators_set_fast(struct kvm *kvm, struct kvm_s390_adapter_int *adapter_int, int setbit) { + struct s390_map_info *ind_info, *summary_info; unsigned long bit; int summary_set; - struct s390_map_info *ind_info, *summary_info; void *map; - spin_lock(&adapter->maps_lock); + guard(srcu)(&kvm->srcu); + guard(spinlock)(&adapter->maps_lock); + ind_info = get_map_info(adapter, adapter_int->ind_addr); - if (!ind_info) { - spin_unlock(&adapter->maps_lock); + if (!ind_info) return -EWOULDBLOCK; - } + map = page_address(ind_info->page); bit = get_ind_bit(ind_info->addr, adapter_int->ind_offset, adapter->swap); - if (setbit) + if (setbit) { set_bit(bit, map); + mark_page_dirty(kvm, gpa_to_gfn(adapter_int->ind_gaddr)); + } + summary_info = get_map_info(adapter, adapter_int->summary_addr); - if (!summary_info) { - spin_unlock(&adapter->maps_lock); + if (!summary_info) return -EWOULDBLOCK; - } + map = page_address(summary_info->page); bit = get_ind_bit(summary_info->addr, adapter_int->summary_offset, adapter->swap); @@ -3069,7 +3069,8 @@ static int adapter_indicators_set_fast(struct kvm *kvm, summary_set = test_and_set_bit(bit, map); else summary_set = test_and_clear_bit(bit, map); - spin_unlock(&adapter->maps_lock); + mark_page_dirty(kvm, gpa_to_gfn(adapter_int->summary_gaddr)); + return summary_set ? 0 : 1; } -- 2.53.0