From patchwork Wed Oct 21 09:24:58 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [1/9] Export function for VA defined ram allocation From: Alexander Graf X-Patchwork-Id: 36510 Message-Id: <1256117106-9475-2-git-send-email-agraf@suse.de> To: qemu-devel Cc: Carsten Otte Date: Wed, 21 Oct 2009 11:24:58 +0200 S390 requires vmas for guests to be < 256 GB. So we need to directly export mmaps "try to use this vma as start address" feature to not accidently get over that limit. Signed-off-by: Alexander Graf --- cpu-common.h | 1 + exec.c | 15 +++++++++++++-- 2 files changed, 14 insertions(+), 2 deletions(-) diff --git a/cpu-common.h b/cpu-common.h index 6302372..ecaf9e3 100644 --- a/cpu-common.h +++ b/cpu-common.h @@ -30,6 +30,7 @@ static inline void cpu_register_physical_memory(target_phys_addr_t start_addr, ram_addr_t cpu_get_physical_page_desc(target_phys_addr_t addr); ram_addr_t qemu_ram_alloc(ram_addr_t); +ram_addr_t _qemu_ram_alloc(ram_addr_t size, void *map_at); void qemu_ram_free(ram_addr_t addr); /* This should only be used for ram local to a device. */ void *qemu_get_ram_ptr(ram_addr_t addr); diff --git a/exec.c b/exec.c index 076d26b..36c26cd 100644 --- a/exec.c +++ b/exec.c @@ -2404,14 +2404,20 @@ void qemu_unregister_coalesced_mmio(target_phys_addr_t addr, ram_addr_t size) kvm_uncoalesce_mmio_region(addr, size); } -ram_addr_t qemu_ram_alloc(ram_addr_t size) +ram_addr_t _qemu_ram_alloc(ram_addr_t size, void *map_at) { RAMBlock *new_block; size = TARGET_PAGE_ALIGN(size); new_block = qemu_malloc(sizeof(*new_block)); - new_block->host = qemu_vmalloc(size); + if (map_at) { + new_block->host = mmap(map_at, size, PROT_EXEC|PROT_READ|PROT_WRITE, + MAP_SHARED | MAP_ANONYMOUS, -1, 0); + + } else { + new_block->host = qemu_vmalloc(size); + } #ifdef MADV_MERGEABLE madvise(new_block->host, size, MADV_MERGEABLE); #endif @@ -2434,6 +2440,11 @@ ram_addr_t qemu_ram_alloc(ram_addr_t size) return new_block->offset; } +ram_addr_t qemu_ram_alloc(ram_addr_t size) +{ + return _qemu_ram_alloc(size, NULL); +} + void qemu_ram_free(ram_addr_t addr) { /* TODO: implement this. */