From nobody Tue Apr 7 14:36:44 2026 Received: from mail-pg1-f201.google.com (mail-pg1-f201.google.com [209.85.215.201]) (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 4646022E3F0 for ; Fri, 13 Mar 2026 00:33:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773361993; cv=none; b=W/rG0PQxO6j1ZzcOGBtqvdyP0BjQa/kuzL7cOb/ZoQ+txgDLa/2SjFILSF3qUOIrxd0jgmGtRh6sadUmN5Hth/fsUYb0aSu9miUpnbO9Nv4uWkQztOky3GFxZ5uuDV5CYIr4XI8WNGsIqX2X18Tek7lHkgbqTPc+x2RwIO3NEww= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773361993; c=relaxed/simple; bh=KUPKNTDRVZ/QfetP6CHMafZgrCFxAJkTY0y1vHbaZjU=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=qv6uBNag1PAydM4rhMWeIMszvt9arLKzqH7s2rKByS4qC3T0P0fnhIizLLClArM6f2TxpxjpDhf8QUkCaA5YJcKzfi/sQYq3ZXSmoDaHFiOWGPBNQdBv7vTeWhzLYECOZiQW1lWTOnbV4mzO0aY84TNKBlw1F0YpnjzXdNxP6CY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=HDzmXS2n; arc=none smtp.client-ip=209.85.215.201 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--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="HDzmXS2n" Received: by mail-pg1-f201.google.com with SMTP id 41be03b00d2f7-c73a4983fc0so915053a12.3 for ; Thu, 12 Mar 2026 17:33:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1773361991; x=1773966791; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=AqRK5iKJVJvsAdFdvM1kG/PPXB8Ro1UYz8Z7jtmY8dE=; b=HDzmXS2nXKLuGrGYJI06KRha5ezF7RA311D7R2+SULm24fvGVB0BcwN3xucLBO8qsd 8vHR5V58x8r0xS39kSUZE6ONXnMIKawtkmrCfmLcLmuvYWR5InfyVzjvpPNw8kvCn4wh JHPchTXDlzar8F19D+DL3uG+O1cXs7pJIhTItxMB7MLM4BAGe05gyVWCGov1Pb5AtNlE 7ceggEWGjO6EifPwCRPiP+R9a3mtm98KexvNyAxn+tWqz1bLWBei0tHDxXaHVTQqu4o2 HAT3FytZovccBX61XHQrizxB94zkWqMa9y48GD8SRxN5aoojKQUmtWryTfflxl4sk0yZ 0y6Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1773361991; x=1773966791; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=AqRK5iKJVJvsAdFdvM1kG/PPXB8Ro1UYz8Z7jtmY8dE=; b=COMtFZFn+1acLHau8nhbp+YsP6YXJ+hgjBO8l2KC5hZEB9TmMq6hDXB2mu9gU/aS63 ejHyJ1u2N7teU6ddCFIof77d3Vc5+Q9Z+ohgMgkFhq0BiPG6uSZn1ipuC/s411KVb57a RsT/GnVVqf3qrJuwT2I7f/rPvaJicLUDzlttqdlyRaQNppbo7aAGRUe80XO1oYe7ydxo 8KyO5+3Mg6XPGiSVKk2qWyGQnGgq7etQanhl0GolGlGWnz3W53h1X5HB3IRHHmod7ha+ IlK8sGg1en+VeHFZ59KRz8g46N+WgPcrSttxZYu9n5xiPqxGvhtzo6bDM4LdXgRhhC3O XDQQ== X-Forwarded-Encrypted: i=1; AJvYcCWNy6d4WeL0Pa0PXx4b2qV0vcVFRjkLy+cD9Aocd40141kh52BV2O0ZbT1R8H7Doz7ajnCZnexDrWtU5hY=@vger.kernel.org X-Gm-Message-State: AOJu0Yz3U2U6i1CiQCtZzvU/m9ByDh0sBDHqyotXMHb5FkMdr7JoP+/x 162J0XlcmLi4HwFoVIdnRdLpId+xK3iUyOgeVqaaeKXKKqUkLNfz/Rb25clTJCQzUet4UKRRiNM cvHTuiw== X-Received: from pglf22.prod.google.com ([2002:a63:1016:0:b0:c73:8240:7190]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:700d:b0:398:8e97:ea7a with SMTP id adf61e73a8af0-398ecdaa227mr962922637.60.1773361991488; Thu, 12 Mar 2026 17:33:11 -0700 (PDT) Reply-To: Sean Christopherson Date: Thu, 12 Mar 2026 17:33:01 -0700 In-Reply-To: <20260313003302.3136111-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260313003302.3136111-1-seanjc@google.com> X-Mailer: git-send-email 2.53.0.851.ga537e3e6e9-goog Message-ID: <20260313003302.3136111-5-seanjc@google.com> Subject: [PATCH 4/5] KVM: SEV: Use PFN_DOWN() to simplify "number of pages" math when pinning memory From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Liam Merwick Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Use PFN_DOWN() instead of open coded equivalents in sev_pin_memory() to simplify the code and make it easier to read. No functional change intended (verified before and after versions of the generated code are identical). Signed-off-by: Sean Christopherson --- arch/x86/kvm/svm/sev.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index bd94c64a9783..ae5b370db9ed 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -682,7 +682,6 @@ static struct page **sev_pin_memory(struct kvm *kvm, un= signed long uaddr, int npinned; unsigned long total_npages, lock_limit; struct page **pages; - unsigned long first, last; int ret; =20 lockdep_assert_held(&kvm->lock); @@ -692,12 +691,10 @@ static struct page **sev_pin_memory(struct kvm *kvm, = unsigned long uaddr, =20 /* * Calculate the number of pages that need to be pinned to cover the - * entire range. Note! This isn't simply ulen >> PAGE_SHIFT, as KVM + * entire range. Note! This isn't simply PFN_DOWN(ulen), as KVM * doesn't require the incoming address+size to be page aligned! */ - first =3D (uaddr & PAGE_MASK) >> PAGE_SHIFT; - last =3D ((uaddr + ulen - 1) & PAGE_MASK) >> PAGE_SHIFT; - npages =3D (last - first + 1); + npages =3D PFN_DOWN(uaddr + ulen - 1) - PFN_DOWN(uaddr) + 1; if (npages > INT_MAX) return ERR_PTR(-EINVAL); =20 --=20 2.53.0.851.ga537e3e6e9-goog