From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f73.google.com (mail-pj1-f73.google.com [209.85.216.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C5481388E77 for ; Mon, 4 May 2026 22:42:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.73 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777934561; cv=none; b=Xk59QTu9t/PwDz8/Uh6HnnwotAuFbfAzV3IB8ESCWVrvLikDKIUyvniX0eYX3H2JbU9k7qfRhjsA2RM77kar5362YxSYkYphHB43UJRGT+sEYiuOW/Xcjs21uixMm4ApveTEuuxLoCAgKGLyIS+pcPnrqIYOWJGL/0Tkl5/hpbw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777934561; c=relaxed/simple; bh=/1xQMlHTpDPPKdx9q0rSMVLO6gl3M86K+ccnqA5gdNI=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=bD5MDHSe3CqSaHIYoUXTHGBlNPgMTaGcF9ohmECoi2YwJe4t6jKypG/A81PhzpvF+9S4jxLtutIgLUyalx02P5Q7R9GVGVxU5qwQwSwd+PD7fL6yX7QGeKtT3yAgHeMg4x6/3h9fgFOyrtv+Ig9tDQj1Ts+Eafm49JXVYg501cY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--jthoughton.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=TVj5872W; arc=none smtp.client-ip=209.85.216.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--jthoughton.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="TVj5872W" Received: by mail-pj1-f73.google.com with SMTP id 98e67ed59e1d1-3568090851aso11983538a91.1 for ; Mon, 04 May 2026 15:42:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1777934559; x=1778539359; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=ua9DP8bxNVeP3OMgw66O02tdFbDSKg07QfaNr/ggdeQ=; b=TVj5872WcGbO5rkLygx+jdlTxLbs57qu3ge1RP8rRNjL09FJ1iCy1SRhb9gnfzMrzt bLLldOz6G3IFUpweOt/4QDTrU1V0LjluE3InA5sYuXSurrBpuo7ucviKjuVbzSfe7Yyj /srHsjmgOp4TLiunQBvEBBsX3DGMp5LgwKVxcJnpR0qHlpdCGlb8y5QSkPVKIqSPMb5H cGC/YPkxmWAkLs2axHIWk2t3nwB4kOygde++rosnAUlbgD72FYNTBw9cx5ktpRzRwJ7q ikIcf4QduCrz2zrDUUnXqUH688hsUzH6xb3QjgujRW33tlHXA6dPzYUjxvw+k6T/j43B kXYg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777934559; x=1778539359; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=ua9DP8bxNVeP3OMgw66O02tdFbDSKg07QfaNr/ggdeQ=; b=UnjPHjtrHuErwbdKLANsSM7JFmwcgLxAG5ebzqeZi4bpfFeaua73edcIUDmnq53niW YtWBLqSS6CaHNb8cQaeJOdd+IgPWw22Oo5tiJI7G+Z68ihy2pl2z/qQEHqmgE25T7iGC jyMeQbBZvL6cuQbyzfC2eDi5yHETGJbYJZ3t/ocf7k+0mDJqD1O7i+WD4fBM/N88lnTI vgISRpxfG8BmHzJ7vgtwBJhJ7740Vl8weusOVgP9qhKIJZ+Xa6YMRPZAmpnYLWEa/Aey keVBbvj+f3yBo9r/98BWrBMmGkUi+A7Lg3pAAeFudANCw7ehVjsDNudgY9LRcHtHhZHm pffw== X-Forwarded-Encrypted: i=1; AFNElJ+0ptZVJfeILPh2kq0AL3MU6ZxeHn846uEKUJNIhTHCvp26ITUELC0W8e6RVlEn0b4WsZa9HmLf8BwvVGw=@vger.kernel.org X-Gm-Message-State: AOJu0Yxpo3PWXdhFL8vydR0YzQNuGaulA/xeyS1grs3e+znSW7DOFC6o vH6Xz/QBzxJJsm+/xlta2H3r4B9dMz2IIvFtSWlAcdyg2Nriwy5l/C+tnofLboaN/YJ29bvnyqR CJVzCI67V2Yt5kb1v3XPAyw== X-Received: from pgvh2.prod.google.com ([2002:a65:6382:0:b0:c79:81df:1175]) (user=jthoughton job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:7e86:b0:3aa:3e4c:9182 with SMTP id adf61e73a8af0-3aa3e4c9385mr220269637.7.1777934558985; Mon, 04 May 2026 15:42:38 -0700 (PDT) Date: Mon, 4 May 2026 22:42:09 +0000 In-Reply-To: <20260504224213.1049426-1-jthoughton@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260504224213.1049426-1-jthoughton@google.com> X-Mailer: git-send-email 2.54.0.545.g6539524ca2-goog Message-ID: <20260504224213.1049426-3-jthoughton@google.com> Subject: [PATCH 2/5] KVM: loongarch: Grab MMU lock in kvm_arch_flush_shadow_all() From: James Houghton To: Paolo Bonzini Cc: Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Sean Christopherson , Gavin Shan , Shaoqin Huang , Ricardo Koller , Tianrui Zhao , Bibo Mao , Huacai Chen , James Hogan , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, James Houghton , stable@vger.kernel.org Content-Type: text/plain; charset="UTF-8" kvm_arch_flush_shadow_all() may be called concurrently on the same `kvm`. This could at least result in accounting mistakes (e.g. underflows on `kvm->stat.*pages`). Cc: stable@vger.kernel.org Fixes: 752e2cd7b4fb ("LoongArch: KVM: Implement kvm mmu operations") Signed-off-by: James Houghton --- Note: This is compile-tested only! arch/loongarch/kvm/mmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/loongarch/kvm/mmu.c b/arch/loongarch/kvm/mmu.c index a7fa458e3360..5dbce9b18e1c 100644 --- a/arch/loongarch/kvm/mmu.c +++ b/arch/loongarch/kvm/mmu.c @@ -486,7 +486,7 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, void kvm_arch_flush_shadow_all(struct kvm *kvm) { - kvm_flush_range(kvm, 0, kvm->arch.gpa_size >> PAGE_SHIFT, 0); + kvm_flush_range(kvm, 0, kvm->arch.gpa_size >> PAGE_SHIFT, 1); } void kvm_arch_flush_shadow_memslot(struct kvm *kvm, struct kvm_memory_slot *slot) -- 2.54.0.545.g6539524ca2-goog