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tcg: Introduce target-specific page data for user-only

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This data can be allocated by page_alloc_target_data() and
released by page_set_flags(start, end, prot | PAGE_RESET).

This data will be used to hold tag memory for AArch64 MTE.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210212184902.1251044-2-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2021-02-12 10:48:32 -08:00 • committed by Peter Maydell
parent 8ba4bca570
commit d9c5858570
4 changed files with 69 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

28
accel/tcg/translate-all.c
View file

@ -114,6 +114,7 @@ typedef struct PageDesc {
unsigned int code_write_count;
#else
unsigned long flags;
void *target_data;
#endif
#ifndef CONFIG_USER_ONLY
QemuSpin lock;
@ -2740,6 +2741,7 @@ int page_get_flags(target_ulong address)
void page_set_flags(target_ulong start, target_ulong end, int flags)
{
target_ulong addr, len;
bool reset_target_data;
/* This function should never be called with addresses outside the
guest address space. If this assert fires, it probably indicates
@ -2754,6 +2756,8 @@ void page_set_flags(target_ulong start, target_ulong end, int flags)
if (flags & PAGE_WRITE) {
flags |= PAGE_WRITE_ORG;
}
reset_target_data = !(flags & PAGE_VALID) || (flags & PAGE_RESET);
flags &= ~PAGE_RESET;
for (addr = start, len = end - start;
len != 0;
@ -2767,10 +2771,34 @@ void page_set_flags(target_ulong start, target_ulong end, int flags)
p->first_tb) {
tb_invalidate_phys_page(addr, 0);
}
if (reset_target_data && p->target_data) {
g_free(p->target_data);
p->target_data = NULL;
}
p->flags = flags;
}
}
void *page_get_target_data(target_ulong address)
{
PageDesc *p = page_find(address >> TARGET_PAGE_BITS);
return p ? p->target_data : NULL;
}
void *page_alloc_target_data(target_ulong address, size_t size)
{
PageDesc *p = page_find(address >> TARGET_PAGE_BITS);
void *ret = NULL;
if (p->flags & PAGE_VALID) {
ret = p->target_data;
if (!ret) {
p->target_data = ret = g_malloc0(size);
}
}
return ret;
}
int page_check_range(target_ulong start, target_ulong len, int flags)
{
PageDesc *p;