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don't map syscall pages into process space

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Request pages, response pages, and a doorbell page are mapped into
process space to enable user processes to delegate system calls
directly to mcctrl/mcexec.

This commit removes these mappings for the following reasons.
- These mappings cause a memory leak in current fork() implementation.
- These mappings are not used.
- These mappings do not function properly.
  And the fix which corrects function of these mappings is not easy.
This commit is contained in:
NAKAMURA Gou
2014-10-08 20:05:38 +09:00
parent 6415559a81
commit aa05f00e7e
2 changed files with 2 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
kernel/host.c
View File

@ -191,38 +191,10 @@ int prepare_process_ranges_args_envs(struct process *proc,
proc->vm->region.data_end;
#endif
/* Map system call stuffs */
flags = VR_RESERVED | VR_PROT_READ | VR_PROT_WRITE;
flags |= VRFLAG_PROT_TO_MAXPROT(flags);
addr = proc->vm->region.map_start - PAGE_SIZE * SCD_RESERVED_COUNT;
e = addr + PAGE_SIZE * DOORBELL_PAGE_COUNT;
if(add_process_memory_range(proc, addr, e,
cpu_local_var(scp).doorbell_pa,
VR_REMOTE | flags, NULL, 0) != 0){
kprintf("ERROR: adding memory range for syscalls dorbell\n");
goto err;
}
addr = e;
e = addr + PAGE_SIZE * REQUEST_PAGE_COUNT;
if(add_process_memory_range(proc, addr, e,
cpu_local_var(scp).request_pa,
VR_REMOTE | flags, NULL, 0) != 0){
kprintf("ERROR: adding memory range for syscalls request pa\n");
goto err;
}
addr = e;
e = addr + PAGE_SIZE * RESPONSE_PAGE_COUNT;
if(add_process_memory_range(proc, addr, e,
cpu_local_var(scp).response_pa,
flags, NULL, 0) != 0){
kprintf("ERROR: adding memory range for syscalls response pa\n");
goto err;
}
/* Map, copy and update args and envs */
flags = VR_PROT_READ | VR_PROT_WRITE;
flags |= VRFLAG_PROT_TO_MAXPROT(flags);
addr = e;
addr = proc->vm->region.map_start - PAGE_SIZE * SCD_RESERVED_COUNT;
e = addr + PAGE_SIZE * ARGENV_PAGE_COUNT;
if((args_envs = ihk_mc_alloc_pages(ARGENV_PAGE_COUNT, IHK_MC_AP_NOWAIT)) == NULL){

3
kernel/include/syscall.h
View File

@ -22,8 +22,7 @@
#define RESPONSE_PAGE_COUNT 16
#define DOORBELL_PAGE_COUNT 1
#define ARGENV_PAGE_COUNT 8
#define SCD_RESERVED_COUNT \
(REQUEST_PAGE_COUNT + RESPONSE_PAGE_COUNT + DOORBELL_PAGE_COUNT + ARGENV_PAGE_COUNT)
#define SCD_RESERVED_COUNT ARGENV_PAGE_COUNT
#define SCD_MSG_PREPARE_PROCESS 0x1
#define SCD_MSG_PREPARE_PROCESS_ACKED 0x2