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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::42e; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x42e.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 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" X-ZohoMail-DKIM: pass (identity @linaro.org) Content-Type: text/plain; charset="utf-8" A size is easier to work with than an end point, particularly during initial buffer allocation. Signed-off-by: Richard Henderson Reviewed-by: Alex Benn=C3=A9e Reviewed-by: Luis Pires --- tcg/region.c | 29 +++++++++++++++++------------ 1 file changed, 17 insertions(+), 12 deletions(-) diff --git a/tcg/region.c b/tcg/region.c index 9a1e039824..a17f342f38 100644 --- a/tcg/region.c +++ b/tcg/region.c @@ -48,7 +48,7 @@ struct tcg_region_state { /* fields set at init time */ void *start; void *start_aligned; - void *end; + size_t total_size; /* size of entire buffer */ size_t n; size_t size; /* size of one region */ size_t stride; /* .size + guard size */ @@ -279,7 +279,7 @@ static void tcg_region_bounds(size_t curr_region, void = **pstart, void **pend) start =3D region.start; } if (curr_region =3D=3D region.n - 1) { - end =3D region.end; + end =3D region.start_aligned + region.total_size; } =20 *pstart =3D start; @@ -813,8 +813,8 @@ static bool alloc_code_gen_buffer(size_t size, int spli= twx, Error **errp) */ void tcg_region_init(size_t tb_size, int splitwx, unsigned max_cpus) { - void *buf, *aligned; - size_t size; + void *buf, *aligned, *end; + size_t total_size; size_t page_size; size_t region_size; size_t n_regions; @@ -826,19 +826,20 @@ void tcg_region_init(size_t tb_size, int splitwx, uns= igned max_cpus) assert(ok); =20 buf =3D tcg_init_ctx.code_gen_buffer; - size =3D tcg_init_ctx.code_gen_buffer_size; + total_size =3D tcg_init_ctx.code_gen_buffer_size; page_size =3D qemu_real_host_page_size; n_regions =3D tcg_n_regions(max_cpus); =20 /* The first region will be 'aligned - buf' bytes larger than the othe= rs */ aligned =3D QEMU_ALIGN_PTR_UP(buf, page_size); - g_assert(aligned < tcg_init_ctx.code_gen_buffer + size); + g_assert(aligned < tcg_init_ctx.code_gen_buffer + total_size); + /* * Make region_size a multiple of page_size, using aligned as the star= t. * As a result of this we might end up with a few extra pages at the e= nd of * the buffer; we will assign those to the last region. */ - region_size =3D (size - (aligned - buf)) / n_regions; + region_size =3D (total_size - (aligned - buf)) / n_regions; region_size =3D QEMU_ALIGN_DOWN(region_size, page_size); =20 /* A region must have at least 2 pages; one code, one guard */ @@ -852,9 +853,11 @@ void tcg_region_init(size_t tb_size, int splitwx, unsi= gned max_cpus) region.start =3D buf; region.start_aligned =3D aligned; /* page-align the end, since its last page will be a guard page */ - region.end =3D QEMU_ALIGN_PTR_DOWN(buf + size, page_size); + end =3D QEMU_ALIGN_PTR_DOWN(buf + total_size, page_size); /* account for that last guard page */ - region.end -=3D page_size; + end -=3D page_size; + total_size =3D end - aligned; + region.total_size =3D total_size; =20 /* * Set guard pages in the rw buffer, as that's the one into which @@ -895,7 +898,7 @@ void tcg_region_prologue_set(TCGContext *s) =20 /* Register the balance of the buffer with gdb. */ tcg_register_jit(tcg_splitwx_to_rx(region.start), - region.end - region.start); + region.start_aligned + region.total_size - region.sta= rt); } =20 /* @@ -936,8 +939,10 @@ size_t tcg_code_capacity(void) =20 /* no need for synchronization; these variables are set at init time */ guard_size =3D region.stride - region.size; - capacity =3D region.end + guard_size - region.start; - capacity -=3D region.n * (guard_size + TCG_HIGHWATER); + capacity =3D region.total_size; + capacity -=3D (region.n - 1) * guard_size; + capacity -=3D region.n * TCG_HIGHWATER; + return capacity; } =20 --=20 2.25.1