From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:39435) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RbD5N-0008Dr-EU for qemu-devel@nongnu.org; Thu, 15 Dec 2011 10:19:14 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RbD5D-0003mE-Pl for qemu-devel@nongnu.org; Thu, 15 Dec 2011 10:19:05 -0500 Received: from mx1.redhat.com ([209.132.183.28]:38563) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RbD5D-0003lu-Fy for qemu-devel@nongnu.org; Thu, 15 Dec 2011 10:18:55 -0500 From: Avi Kivity Date: Thu, 15 Dec 2011 17:18:35 +0200 Message-Id: <1323962319-13762-4-git-send-email-avi@redhat.com> In-Reply-To: <1323962319-13762-1-git-send-email-avi@redhat.com> References: <1323962319-13762-1-git-send-email-avi@redhat.com> Subject: [Qemu-devel] [PATCH 3/7] memory: introduce memory_region_set_alias_offset() List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Anthony Liguori Cc: qemu-devel@nongnu.org Add an API to update an alias offset of an active alias. This can be used to simplify implementation of dynamic memory banks. Signed-off-by: Avi Kivity --- memory.c | 14 ++++++++++++++ memory.h | 12 ++++++++++++ 2 files changed, 26 insertions(+), 0 deletions(-) diff --git a/memory.c b/memory.c index a080d21..7e842b3 100644 --- a/memory.c +++ b/memory.c @@ -1345,6 +1345,20 @@ void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr) memory_region_transaction_commit(); } +void memory_region_set_alias_offset(MemoryRegion *mr, target_phys_addr_t offset) +{ + target_phys_addr_t old_offset = mr->alias_offset; + + assert(mr->alias); + mr->alias_offset = offset; + + if (offset == old_offset || !mr->parent) { + return; + } + + memory_region_update_topology(mr); +} + void set_system_memory_map(MemoryRegion *mr) { address_space_memory.root = mr; diff --git a/memory.h b/memory.h index db53422..c07bcca 100644 --- a/memory.h +++ b/memory.h @@ -529,6 +529,18 @@ void memory_region_set_enabled(MemoryRegion *mr, bool enabled); */ void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr); +/* + * memory_region_set_alias_offset: dynamically update a memory alias's offset + * + * Dynamically updates the offset into the target region that an alias points + * to, as if the fourth argument to memory_region_init_alias() has changed. + * + * @mr: the #MemoryRegion to be updated; should be an alias. + * @offset: the new offset into the target memory region + */ +void memory_region_set_alias_offset(MemoryRegion *mr, + target_phys_addr_t offset); + /* Start a transaction; changes will be accumulated and made visible only * when the transaction ends. */ -- 1.7.7.1