From nobody Sun Dec 14 11:36:01 2025 Received: from mail-vk1-f202.google.com (mail-vk1-f202.google.com [209.85.221.202]) (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 A55C770825 for ; Tue, 4 Feb 2025 00:40:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738629660; cv=none; b=T91HCgNMDaaKmn8VRkC0/GDNR0kBST62RvHW9ti0Hpjfc6phfDTGaRMD7VU9QuqgMaYVLc4WbsEhujdDdPpSYmPt4HKwuPlJcyuHpsYaN3Cu5VisYZ05GypJOseAa904S4JERWV2EN6QOTKEQ4G9TpL7Knc2TmsZPXmVkZ1ACyE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738629660; c=relaxed/simple; bh=d6Z0Qr4CTc08P9WkJMHZwVj8gKSLjMo2tlv6iVU7it0=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=r9LW8P8ZSMauVcI98OsY5jMwxDyU8f/o4jNQw+qQr2jDKA2YLDntEGxck/VvTHZpNNw2v3ZWuXbgu3jcBzmYDVd96AKIoJ5y5+Nt39XoPgsEl+fwUGTwQ/7cXSoJkyxuSLWQbbTB6nbbjzi6vJi7DMBBge65qhcC1mVdg/oM8Bo= 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=DTg5c4IK; arc=none smtp.client-ip=209.85.221.202 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="DTg5c4IK" Received: by mail-vk1-f202.google.com with SMTP id 71dfb90a1353d-51604d32337so1006754e0c.3 for ; Mon, 03 Feb 2025 16:40:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1738629657; x=1739234457; 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=Z8EVTlPHi7Mb2Te93qLO1p412b+GgWZ4HCCPa7QLCB4=; b=DTg5c4IK4uqeuKtprc8dCv/TZ7A4uurNkQMARBgJxO+sjnAeHiw8rFBELPn6xJP5uC xgJfetwG8KkHjqgLqiwIKmMJria6QEul1ClGwcQ3fPKRFbqo8xIfN8WUK5NkGLGBpmXd 9IVxv/pkg0IeWlG9S5kp04FDegDFP4FlD9eebRcu7p+uSU8x6THomfAV9aVzDT08bWJ1 6xsOo0TDwPuqVx3NRUNjKXgR8ObT1AGkb9Wdp7Xxp7U1JMJVZQW5Pq/qiWCxB/m53djr 2TFRspj9z/Pw23JuoJZDv3s5Oav9LvjH46cxLrHPJut+nKDZ0qSt48U5VyTbres1KwFE 3CtQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1738629657; x=1739234457; 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=Z8EVTlPHi7Mb2Te93qLO1p412b+GgWZ4HCCPa7QLCB4=; b=uhoHTu1YviyZ/+pvNZCfgSRAqCvWvK1WEYRlTzdTHTBrc92IUNES86XVK+6Lg4b9pA rxhkBOMx56jL9FcT2JSkm6lf5mX4DeQqYCIm20DUBVx367CNFDik78S4c9Gkfr3yBXod NMTXnbnvHMsqX+BzeMGYVe2Pa+z0oVn0Ckn7CXbRfr8RK86wBLHSCTA31nsBoe0Mh3J3 yHATKlE2TpWSo5G1ski+Wd52w7K1U+svU6gmuECe2h9vTUpK+Q6P4ULlzSB0YocHFW9R 6mJH+93fcg8WElLQeQosPRilCkeFVxCvRvUv2V/EQNzpmg6akVZ835ycRs620exzoFTI Hm1g== X-Forwarded-Encrypted: i=1; AJvYcCU/8EDSHE56AxWnqRuc9BK0iAkwEv4J3LPTOcOAo9hyxmpFxo1ddbsCg/mzvRF050QPx9lZdViBC4bXDVY=@vger.kernel.org X-Gm-Message-State: AOJu0YzZ/BrMQMVcnxeKU+Pb8PoVAK3P9/rLZyiytsmdyO1WAfwTZlaO WKRMmcs3dJxnsQzqCmDobCjp6V5gHKUH1nz5ue31mGplFqdLcAxEVQPH550z4GLqO1g+wg+GnFm 3/YA47Ud2xbPhJc/HbQ== X-Google-Smtp-Source: AGHT+IGHq940BRezUkVwlNOCiT1XgwqRxT3qyHCt+hNVEw0Fg5bWPvg40CR+xh2gIgoPsc7fxthizhVN+hgnsK9w X-Received: from vsbid8.prod.google.com ([2002:a05:6102:4bc8:b0:4af:ed99:8589]) (user=jthoughton job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6102:c0f:b0:4af:c519:4e86 with SMTP id ada2fe7eead31-4b9a4ec4902mr18110648137.1.1738629657558; Mon, 03 Feb 2025 16:40:57 -0800 (PST) Date: Tue, 4 Feb 2025 00:40:30 +0000 In-Reply-To: <20250204004038.1680123-1-jthoughton@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250204004038.1680123-1-jthoughton@google.com> X-Mailer: git-send-email 2.48.1.362.g079036d154-goog Message-ID: <20250204004038.1680123-4-jthoughton@google.com> Subject: [PATCH v9 03/11] KVM: x86/mmu: Factor out spte atomic bit clearing routine From: James Houghton To: Sean Christopherson , Paolo Bonzini Cc: David Matlack , David Rientjes , James Houghton , Marc Zyngier , Oliver Upton , Wei Xu , Yu Zhao , Axel Rasmussen , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This new function, tdp_mmu_clear_spte_bits_atomic(), will be used in a follow-up patch to enable lockless Accessed bit clearing. Signed-off-by: James Houghton Acked-by: Yu Zhao --- arch/x86/kvm/mmu/tdp_iter.h | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/arch/x86/kvm/mmu/tdp_iter.h b/arch/x86/kvm/mmu/tdp_iter.h index 047b78333653..9135b035fa40 100644 --- a/arch/x86/kvm/mmu/tdp_iter.h +++ b/arch/x86/kvm/mmu/tdp_iter.h @@ -25,6 +25,13 @@ static inline u64 kvm_tdp_mmu_write_spte_atomic(tdp_ptep= _t sptep, u64 new_spte) return xchg(rcu_dereference(sptep), new_spte); } =20 +static inline u64 tdp_mmu_clear_spte_bits_atomic(tdp_ptep_t sptep, u64 mas= k) +{ + atomic64_t *sptep_atomic =3D (atomic64_t *)rcu_dereference(sptep); + + return (u64)atomic64_fetch_and(~mask, sptep_atomic); +} + static inline void __kvm_tdp_mmu_write_spte(tdp_ptep_t sptep, u64 new_spte) { KVM_MMU_WARN_ON(is_ept_ve_possible(new_spte)); @@ -63,12 +70,8 @@ static inline u64 kvm_tdp_mmu_write_spte(tdp_ptep_t spte= p, u64 old_spte, static inline u64 tdp_mmu_clear_spte_bits(tdp_ptep_t sptep, u64 old_spte, u64 mask, int level) { - atomic64_t *sptep_atomic; - - if (kvm_tdp_mmu_spte_need_atomic_write(old_spte, level)) { - sptep_atomic =3D (atomic64_t *)rcu_dereference(sptep); - return (u64)atomic64_fetch_and(~mask, sptep_atomic); - } + if (kvm_tdp_mmu_spte_need_atomic_write(old_spte, level)) + return tdp_mmu_clear_spte_bits_atomic(sptep, mask); =20 __kvm_tdp_mmu_write_spte(sptep, old_spte & ~mask); return old_spte; --=20 2.48.1.362.g079036d154-goog