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[71.42.197.3]) by smtp.gmail.com with ESMTPSA id 5614622812f47-3ff052799b6sm465104b6e.37.2025.03.28.13.05.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Mar 2025 13:05:08 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: pierrick.bouvier@linaro.org, philmd@linaro.org Subject: [PATCH 8/9] page-vary: Move and rename qemu_target_page_bits_min Date: Fri, 28 Mar 2025 15:04:58 -0500 Message-ID: <20250328200459.483089-9-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250328200459.483089-1-richard.henderson@linaro.org> References: <20250328200459.483089-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::32a; envelope-from=richard.henderson@linaro.org; helo=mail-ot1-x32a.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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org Rename to migration_legacy_page_bits, to make it clear that we cannot change the value without causing a migration break. Move to page-vary.h and page-vary-target.c. Define via TARGET_PAGE_BITS if not TARGET_PAGE_BITS_VARY. Signed-off-by: Richard Henderson Reviewed-by: Pierrick Bouvier --- include/exec/page-vary.h | 9 +++++++++ include/exec/target_page.h | 1 - migration/savevm.c | 6 +++--- page-target.c | 5 ----- page-vary-target.c | 9 +++++++++ 5 files changed, 21 insertions(+), 9 deletions(-) diff --git a/include/exec/page-vary.h b/include/exec/page-vary.h index 54ddde308a..101c25911c 100644 --- a/include/exec/page-vary.h +++ b/include/exec/page-vary.h @@ -49,4 +49,13 @@ bool set_preferred_target_page_bits(int bits); */ void finalize_target_page_bits(void); +/** + * migration_legacy_page_bits + * + * For migration compatibility with qemu v2.9, prior to the introduction + * of the configuration/target-page-bits section, return the value of + * TARGET_PAGE_BITS that the target had then. + */ +int migration_legacy_page_bits(void); + #endif /* EXEC_PAGE_VARY_H */ diff --git a/include/exec/target_page.h b/include/exec/target_page.h index 8e89e5cbe6..e4bd7f7767 100644 --- a/include/exec/target_page.h +++ b/include/exec/target_page.h @@ -63,7 +63,6 @@ static inline int qemu_target_page_bits(void) return TARGET_PAGE_BITS; } -int qemu_target_page_bits_min(void); size_t qemu_target_pages_to_MiB(size_t pages); #endif diff --git a/migration/savevm.c b/migration/savevm.c index c33200a33f..0c12e373b4 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -50,6 +50,7 @@ #include "system/cpus.h" #include "system/memory.h" #include "exec/target_page.h" +#include "exec/page-vary.h" #include "trace.h" #include "qemu/iov.h" #include "qemu/job.h" @@ -339,7 +340,7 @@ static int configuration_pre_load(void *opaque) * predates the variable-target-page-bits support and is using the * minimum possible value for this CPU. */ - state->target_page_bits = qemu_target_page_bits_min(); + state->target_page_bits = migration_legacy_page_bits(); return 0; } @@ -462,8 +463,7 @@ static const VMStateInfo vmstate_info_capability = { */ static bool vmstate_target_page_bits_needed(void *opaque) { - return qemu_target_page_bits() - > qemu_target_page_bits_min(); + return qemu_target_page_bits() > migration_legacy_page_bits(); } static const VMStateDescription vmstate_target_page_bits = { diff --git a/page-target.c b/page-target.c index 321e43d06f..8fcd5443b5 100644 --- a/page-target.c +++ b/page-target.c @@ -9,11 +9,6 @@ #include "qemu/osdep.h" #include "exec/target_page.h" -int qemu_target_page_bits_min(void) -{ - return TARGET_PAGE_BITS_MIN; -} - /* Convert target pages to MiB (2**20). */ size_t qemu_target_pages_to_MiB(size_t pages) { diff --git a/page-vary-target.c b/page-vary-target.c index 84ddeb7c26..6251d948cf 100644 --- a/page-vary-target.c +++ b/page-vary-target.c @@ -23,6 +23,15 @@ #include "exec/page-vary.h" #include "exec/target_page.h" +int migration_legacy_page_bits(void) +{ +#ifdef TARGET_PAGE_BITS_VARY + return TARGET_PAGE_BITS_MIN; +#else + return TARGET_PAGE_BITS; +#endif +} + bool set_preferred_target_page_bits(int bits) { #ifdef TARGET_PAGE_BITS_VARY