From nobody Thu Sep 19 01:12:55 2024 Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) (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 DE628188CB8 for ; Fri, 26 Jul 2024 23:54:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722038085; cv=none; b=un36mBmFhhR3ejqOqIJoNBB6TJmkbQqTt5Surbri+NFA8Zdwe/JIAzSuOOoj2nlZzoNtjCl+9+Ofx0+G68M0ozSv/u+HkVCR6eqZHXxqlEO4ULVVG1Z4jqDiMlS6ABetzCdvqpYYOImbrgGAxleBmq0W8Lu4IymHuwdNgorplcg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722038085; c=relaxed/simple; bh=cf98YpKAzSnKSydcfMP082/xfk70ScQmPGu4ud3+tiY=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=IRY+OYt311lZvco0HwxOfPWC2nxSQrZKp7jX4fe5b1oo4F8oGibRK+TTcZb3hseXwoZw8wTdX2+r0wqpPkETDMbajZMhRcofSyMe5hGdAkC26t6xxMH14mv+/tsWR/ED2856e4bQfujsRNVipoXBRhCJ+/FeNTU7sGNtRDCRH6k= 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=ALmb9nPO; arc=none smtp.client-ip=209.85.219.202 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--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="ALmb9nPO" Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-e08bc29c584so396745276.0 for ; Fri, 26 Jul 2024 16:54:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1722038083; x=1722642883; 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=6xYXr8Us14FXXKODtWRB0Ht9lxWZb28t4tAXkZ5fXOk=; b=ALmb9nPOUiTHX1TXXUEwpqY73/hhF5D/EoEuFKxkFTPMGGg9hfvz2qIvYf51M5eHUM igGXZINtRmYjFfu2usOtT/NVjWUkvPPz+KnhF/+CgFTPvFSuwSThEbzZpWo8TMTQt7S0 +x46Hlghh2nw+wRcjEIelHQuy/RLICFyHFpfZOk+uce9spm7pboigtfnSymbYzRukPi8 4pxmuJsPXdxS35QU7YYFm7zDs0JU7UaiboBy9dpfgNXsza0eYKslxyWAbGXFLohxyz6P 4Q/vCYm3fHKJtUI7QwBOzsm6QS+Gh2nDVBdIHgkWHfXAz9hIQ9o3UiJiJleysPYjzQIt axLw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722038083; x=1722642883; 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=6xYXr8Us14FXXKODtWRB0Ht9lxWZb28t4tAXkZ5fXOk=; b=AFZXOhhlU3uDaVLpIFDCSa/L41yKS+0Hu/jPYNytqryFQybQBl1ewtdVQuMh+CrzNi FyizvXkpHwt2uwg300TyuvBNo+/SQMabPbLwbzzfSLdiU9648yLbBHAcVxL/QhtzaJuE onbO3ObpKC9UjRFg4iWA6wYdH9ZTyfJNoUMV9CSngfU01D/Gyeh7YrmMijxBBsEpfs6+ 2tNJjXLQrb9QPbtPAQkpUPYEVz5FiZNsq8d+Q5k7xRgRekQfSGGr5+z6NInru7qAdzSL vuGiUZxuIDyLxrxP7gkvFlOMK9eGf9DvXQpZc2PREmK0t49S0rwvcXlnkROkhM8Yh+FO 383A== X-Forwarded-Encrypted: i=1; AJvYcCU144AZCcPi/Z8md0/pr0tuGMwLknBWsm+fEVasAPh1o2ZuId9EO8N7Ula9CGI372L4qV7owjd7xxg+xXDBnv0BvbjTjBTg4AmoUa1X X-Gm-Message-State: AOJu0YwicciHmrdgd9NtaQ8ebKCWqHQrLEHhIUw1Ztu1nO7eWfEu5nk1 uuwpW/OISk+7vPefQJtVS2ZPERcC7l428tbn5+V8zLeWHKtl97XS6MUWHolafwCttoe9erLvYjy s1Q== X-Google-Smtp-Source: AGHT+IE8wacjAGm1xSlUK/1K8X0GxeW+L1fXTQ/Y1AQI/5HhDGzzQTYAcJk3V2f1As7zQmLQNuyAyAYHMio= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a25:8c02:0:b0:e05:f1ad:a139 with SMTP id 3f1490d57ef6-e0b545c6203mr2068276.11.1722038082801; Fri, 26 Jul 2024 16:54:42 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 26 Jul 2024 16:52:09 -0700 In-Reply-To: <20240726235234.228822-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240726235234.228822-1-seanjc@google.com> X-Mailer: git-send-email 2.46.0.rc1.232.g9752f9e123-goog Message-ID: <20240726235234.228822-61-seanjc@google.com> Subject: [PATCH v12 60/84] KVM: PPC: Use __kvm_faultin_pfn() to handle page faults on Book3s Radix From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Oliver Upton , Tianrui Zhao , Bibo Mao , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Sean Christopherson Cc: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, David Matlack , David Stevens Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Replace Book3s Radix's homebrewed (read: copy+pasted) fault-in logic with __kvm_faultin_pfn(), which functionally does pretty much the exact same thing. Note, when the code was written, KVM indeed didn't do fast GUP without "!atomic && !async", but that has long since changed (KVM tries fast GUP for all writable mappings). Signed-off-by: Sean Christopherson --- arch/powerpc/kvm/book3s_64_mmu_radix.c | 29 +++++--------------------- 1 file changed, 5 insertions(+), 24 deletions(-) diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book= 3s_64_mmu_radix.c index 8304b6f8fe45..14891d0a3b73 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c @@ -829,40 +829,21 @@ int kvmppc_book3s_instantiate_page(struct kvm_vcpu *v= cpu, unsigned long mmu_seq; unsigned long hva, gfn =3D gpa >> PAGE_SHIFT; bool upgrade_write =3D false; - bool *upgrade_p =3D &upgrade_write; pte_t pte, *ptep; unsigned int shift, level; int ret; bool large_enable; + kvm_pfn_t pfn; =20 /* used to check for invalidations in progress */ mmu_seq =3D kvm->mmu_invalidate_seq; smp_rmb(); =20 - /* - * Do a fast check first, since __gfn_to_pfn_memslot doesn't - * do it with !atomic && !async, which is how we call it. - * We always ask for write permission since the common case - * is that the page is writable. - */ hva =3D gfn_to_hva_memslot(memslot, gfn); - if (!kvm_ro && get_user_page_fast_only(hva, FOLL_WRITE, &page)) { - upgrade_write =3D true; - } else { - unsigned long pfn; - - /* Call KVM generic code to do the slow-path check */ - pfn =3D __gfn_to_pfn_memslot(memslot, gfn, false, NULL, - writing, upgrade_p); - if (is_error_noslot_pfn(pfn)) - return -EFAULT; - page =3D NULL; - if (pfn_valid(pfn)) { - page =3D pfn_to_page(pfn); - if (PageReserved(page)) - page =3D NULL; - } - } + pfn =3D __kvm_faultin_pfn(memslot, gfn, writing ? FOLL_WRITE : 0, + &upgrade_write, &page); + if (is_error_noslot_pfn(pfn)) + return -EFAULT; =20 /* * Read the PTE from the process' radix tree and use that --=20 2.46.0.rc1.232.g9752f9e123-goog