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Thu, 06 Jun 2024 21:25:58 -0700 (PDT) From: Warner Losh To: qemu-devel@nongnu.org Cc: Kyle Evans , Laurent Vivier , Richard Henderson , Warner Losh Subject: [PATCH 3/3] bsd-user: Catch up to run-time reserved_va math Date: Thu, 6 Jun 2024 22:25:03 -0600 Message-ID: <20240607042503.25222-4-imp@bsdimp.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240607042503.25222-1-imp@bsdimp.com> References: <20240607042503.25222-1-imp@bsdimp.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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: none client-ip=2607:f8b0:4864:20::12d; envelope-from=imp@bsdimp.com; helo=mail-il1-x12d.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham 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 @bsdimp-com.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1717734425771100005 Content-Type: text/plain; charset="utf-8" Catch up to linux-user's 8f67b9c694d0, 13c13397556a, 2f7828b57293, and 95059f9c313a by Richard Henderson which made reserved_va a run-time calculation, defaulting to nothing except in the case of 64-bit host 32-bit target. Also include the adjustment of the comment heading that work submitted in the same patch stream. Since this is a direct copy, squash it into one patch rather than follow the Linux evolution since breaking this down further at this point doesn't make sense for this "new code". Signed-off-by: Warner Losh --- bsd-user/main.c | 39 +++++++++++++++++++++++++++------------ 1 file changed, 27 insertions(+), 12 deletions(-) diff --git a/bsd-user/main.c b/bsd-user/main.c index d685734d087..dcad266c2c9 100644 --- a/bsd-user/main.c +++ b/bsd-user/main.c @@ -77,25 +77,16 @@ bool have_guest_base; # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS # if TARGET_VIRT_ADDR_SPACE_BITS =3D=3D 32 && \ (TARGET_LONG_BITS =3D=3D 32 || defined(TARGET_ABI32)) -# define MAX_RESERVED_VA 0xfffffffful +# define MAX_RESERVED_VA(CPU) 0xfffffffful # else -# define MAX_RESERVED_VA ((1ul << TARGET_VIRT_ADDR_SPACE_BITS) - 1) +# define MAX_RESERVED_VA(CPU) ((1ul << TARGET_VIRT_ADDR_SPACE_BITS) - 1) # endif # else -# define MAX_RESERVED_VA 0 +# define MAX_RESERVED_VA(CPU) 0 # endif #endif =20 -/* - * That said, reserving *too* much vm space via mmap can run into problems - * with rlimits, oom due to page table creation, etc. We will still try i= t, - * if directed by the command-line option, but not by default. - */ -#if HOST_LONG_BITS =3D=3D 64 && TARGET_VIRT_ADDR_SPACE_BITS <=3D 32 -unsigned long reserved_va =3D MAX_RESERVED_VA; -#else unsigned long reserved_va; -#endif =20 const char *interp_prefix =3D CONFIG_QEMU_INTERP_PREFIX; const char *qemu_uname_release; @@ -293,6 +284,7 @@ int main(int argc, char **argv) envlist_t *envlist =3D NULL; char *argv0 =3D NULL; int host_page_size; + unsigned long max_reserved_va; =20 adjust_ssize(); =20 @@ -493,6 +485,29 @@ int main(int argc, char **argv) cpu_reset(cpu); thread_cpu =3D cpu; =20 + /* + * Reserving too much vm space via mmap can run into problems with rli= mits, + * oom due to page table creation, etc. We will still try it, if dire= cted + * by the command-line option, but not by default. Unless we're runnin= g a + * target address space of 32 or fewer bits on a host with 64 bits. + */ + max_reserved_va =3D MAX_RESERVED_VA(cpu); + if (reserved_va !=3D 0) { + if ((reserved_va + 1) % host_page_size) { + char *s =3D size_to_str(host_page_size); + fprintf(stderr, "Reserved virtual address not aligned mod %s\n= ", s); + g_free(s); + exit(EXIT_FAILURE); + } + if (max_reserved_va && reserved_va > max_reserved_va) { + fprintf(stderr, "Reserved virtual address too big\n"); + exit(EXIT_FAILURE); + } + } else if (HOST_LONG_BITS =3D=3D 64 && TARGET_VIRT_ADDR_SPACE_BITS <= =3D 32) { + /* MAX_RESERVED_VA + 1 is a large power of 2, so is aligned. */ + reserved_va =3D max_reserved_va; + } + if (getenv("QEMU_STRACE")) { do_strace =3D 1; } --=20 2.43.0