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bh=yTAhra5hWOo79Lnr6O9bGe/90dQYP3WAL0JeuVs1BvM=; b=i5/H9yQ8wwB/uc8KIqGfW9ohUtHUrkigLuRYyMVjKH9cqy9Fhwj3oROj1r9z4DmG+kD2ML BO4mB7Dbk0nGG8h/81Gy5oT53bIMe53/HL5M9ZiKO1xPmlwQUcouZg7tday5D8YNTtTRXL xpDlpdzwPXH9XFtzpEUyNXp/+69qUww= X-MC-Unique: omqZ1I13M_6a1mPOW7Bg6A-1 From: Thomas Huth To: qemu-devel@nongnu.org, Peter Maydell Cc: qemu-ppc@nongnu.org, =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Nicholas Piggin , Daniel Henrique Barboza , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: [PATCH 2/3] target/ppc/kvm: Replace variable length array in kvmppc_read_hptes() Date: Wed, 21 Feb 2024 17:26:35 +0100 Message-ID: <20240221162636.173136-3-thuth@redhat.com> In-Reply-To: <20240221162636.173136-1-thuth@redhat.com> References: <20240221162636.173136-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.05, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1708532875370100003 Content-Type: text/plain; charset="utf-8" HPTES_PER_GROUP is 8 and HASH_PTE_SIZE_64 is 16, so we don't waste too many bytes by always allocating the maximum amount of bytes on the stack here to get rid of the variable length array. Suggested-by: Peter Maydell Signed-off-by: Thomas Huth Reviewed-by: Peter Maydell --- target/ppc/kvm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c index e7e39c3091..bcf30a5400 100644 --- a/target/ppc/kvm.c +++ b/target/ppc/kvm.c @@ -2770,9 +2770,9 @@ void kvmppc_read_hptes(ppc_hash_pte64_t *hptes, hwadd= r ptex, int n) while (i < n) { struct kvm_get_htab_header *hdr; int m =3D n < HPTES_PER_GROUP ? n : HPTES_PER_GROUP; - char buf[sizeof(*hdr) + m * HASH_PTE_SIZE_64]; + char buf[sizeof(*hdr) + HPTES_PER_GROUP * HASH_PTE_SIZE_64]; =20 - rc =3D read(fd, buf, sizeof(buf)); + rc =3D read(fd, buf, sizeof(*hdr) + m * HASH_PTE_SIZE_64); if (rc < 0) { hw_error("kvmppc_read_hptes: Unable to read HPTEs"); } --=20 2.43.2