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linux-user: Fix h2g usage in page_find_alloc

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Paul's comment on my first approach to fix the h2g usage in
page_find_alloc finally open my eyes about what the code is actually
supposed to do:

With the help of h2g_valid we can no cleanly check if a freshly allocate
page (for host usage) is guest-reachable and, in case it is, mark it
reserved in the guest's address range.

Signed-off-by: Jan Kiszka <jan.kiszka@web.de>
Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Acked-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5957 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2008-12-08 18:12:26 +00:00
parent 14cc46b19a
commit fb1c2cd7d9
1 changed files with 2 additions and 3 deletions
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5
exec.c
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@ -305,14 +305,13 @@ static inline PageDesc *page_find_alloc(target_ulong index)
if (!p) {
/* allocate if not found */
#if defined(CONFIG_USER_ONLY)
unsigned long addr;
size_t len = sizeof(PageDesc) * L2_SIZE;
/* Don't use qemu_malloc because it may recurse. */
p = mmap(0, len, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
*lp = p;
addr = h2g(p);
if (addr == (target_ulong)addr) {
if (h2g_valid(p)) {
unsigned long addr = h2g(p);
page_set_flags(addr & TARGET_PAGE_MASK,
TARGET_PAGE_ALIGN(addr + len),
PAGE_RESERVED);