[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH 10/17] linux-user: resolve reserved_va vma downwards
From: |
riku . voipio |
Subject: |
[Qemu-devel] [PATCH 10/17] linux-user: resolve reserved_va vma downwards |
Date: |
Fri, 6 Apr 2012 19:35:10 +0300 |
From: Peter Maydell <address@hidden>
After consulting with Paul Brook, we concluded that it's best to search
the VMA space downwards, so that we don't even get the chance to conflict
with the brk range.
This patch resolves a bunch of allocation conflicts when using -R.
Signed-off-by: Alexander Graf <address@hidden>
[minor changes to get it to apply -- PMM]
Signed-off-by: Riku Voipio <address@hidden>
---
linux-user/main.c | 1 +
linux-user/mmap.c | 35 ++++++++++++++++++++++++-----------
linux-user/qemu.h | 1 +
3 files changed, 26 insertions(+), 11 deletions(-)
diff --git a/linux-user/main.c b/linux-user/main.c
index 2570140..aa95db3 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -3420,6 +3420,7 @@ int main(int argc, char **argv, char **envp)
guest_base = HOST_PAGE_ALIGN((unsigned long)p);
}
qemu_log("Reserved 0x%lx bytes of guest address space\n", reserved_va);
+ mmap_next_start = reserved_va;
}
if (reserved_va || have_guest_base) {
diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index 994c02b..7125d1c 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -212,7 +212,7 @@ static int mmap_frag(abi_ulong real_start,
#else
# define TASK_UNMAPPED_BASE 0x40000000
#endif
-static abi_ulong mmap_next_start = TASK_UNMAPPED_BASE;
+abi_ulong mmap_next_start = TASK_UNMAPPED_BASE;
unsigned long last_brk;
@@ -222,7 +222,7 @@ unsigned long last_brk;
static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size)
{
abi_ulong addr;
- abi_ulong last_addr;
+ abi_ulong end_addr;
int prot;
int looped = 0;
@@ -230,25 +230,38 @@ static abi_ulong mmap_find_vma_reserved(abi_ulong start,
abi_ulong size)
return (abi_ulong)-1;
}
- last_addr = start;
- for (addr = start; last_addr + size != addr; addr += qemu_host_page_size) {
- if (last_addr + size >= RESERVED_VA
- || (abi_ulong)(last_addr + size) < last_addr) {
+ size = HOST_PAGE_ALIGN(size);
+ end_addr = start + size;
+ if (end_addr > RESERVED_VA) {
+ end_addr = RESERVED_VA;
+ }
+ addr = end_addr - qemu_host_page_size;
+
+ while (1) {
+ if (addr > end_addr) {
if (looped) {
return (abi_ulong)-1;
}
- last_addr = qemu_host_page_size;
- addr = 0;
+ end_addr = RESERVED_VA;
+ addr = end_addr - qemu_host_page_size;
looped = 1;
continue;
}
prot = page_get_flags(addr);
if (prot) {
- last_addr = addr + qemu_host_page_size;
+ end_addr = addr;
+ }
+ if (addr + size == end_addr) {
+ break;
}
+ addr -= qemu_host_page_size;
+ }
+
+ if (start == mmap_next_start) {
+ mmap_next_start = addr;
}
- mmap_next_start = addr;
- return last_addr;
+
+ return addr;
}
#endif
diff --git a/linux-user/qemu.h b/linux-user/qemu.h
index 6889567..dd74cc0 100644
--- a/linux-user/qemu.h
+++ b/linux-user/qemu.h
@@ -251,6 +251,7 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong
old_size,
abi_ulong new_addr);
int target_msync(abi_ulong start, abi_ulong len, int flags);
extern unsigned long last_brk;
+extern abi_ulong mmap_next_start;
void mmap_lock(void);
void mmap_unlock(void);
abi_ulong mmap_find_vma(abi_ulong, abi_ulong);
--
1.7.5.4
- [Qemu-devel] [PATCH 00/17] linux-user: pending patches, riku . voipio, 2012/04/06
- [Qemu-devel] [PATCH 09/17] linux-user: take RESERVED_VA into account for g2h_valid(), riku . voipio, 2012/04/06
- [Qemu-devel] [PATCH 06/17] linux-user: add BLKSSZGET ioctl wrapper, riku . voipio, 2012/04/06
- [Qemu-devel] [PATCH 14/17] linux-user/arm/syscall_nr.h: Add syscall number for ppoll, riku . voipio, 2012/04/06
- [Qemu-devel] [PATCH 10/17] linux-user: resolve reserved_va vma downwards,
riku . voipio <=
- [Qemu-devel] [PATCH 16/17] elf.h: Update EF_ARM_ constants to newer ABI versions, riku . voipio, 2012/04/06
- [Qemu-devel] [PATCH 12/17] linux-user/syscall.c: Fix indentation in prctl handling, riku . voipio, 2012/04/06
- [Qemu-devel] [PATCH 03/17] linux-user: implement device mapper ioctls, riku . voipio, 2012/04/06
- [Qemu-devel] [PATCH 15/17] arm-linux-user: fix elfload.c's AT_HWCAP to reflect cpu features., riku . voipio, 2012/04/06
- [Qemu-devel] [PATCH 13/17] linux-user: Add support for prctl PR_GET_NAME and PR_SET_NAME, riku . voipio, 2012/04/06
- [Qemu-devel] [PATCH 08/17] linux-user: fix fallocate, riku . voipio, 2012/04/06
- [Qemu-devel] [PATCH 02/17] linux-user: target_argv is placed on ts->bprm->argv and can't be freed(), riku . voipio, 2012/04/06
- [Qemu-devel] [PATCH 05/17] linux-user: fix BLK ioctl arguments, riku . voipio, 2012/04/06