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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
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42
include/exec/cpu-all.h
View file

@ -256,15 +256,21 @@ extern intptr_t qemu_host_page_mask;
#define PAGE_EXEC 0x0004
#define PAGE_BITS (PAGE_READ | PAGE_WRITE | PAGE_EXEC)
#define PAGE_VALID 0x0008
/* original state of the write flag (used when tracking self-modifying
code */
/*
* Original state of the write flag (used when tracking self-modifying code)
*/
#define PAGE_WRITE_ORG 0x0010
/* Invalidate the TLB entry immediately, helpful for s390x
* Low-Address-Protection. Used with PAGE_WRITE in tlb_set_page_with_attrs() */
#define PAGE_WRITE_INV 0x0040
/*
* Invalidate the TLB entry immediately, helpful for s390x
* Low-Address-Protection. Used with PAGE_WRITE in tlb_set_page_with_attrs()
*/
#define PAGE_WRITE_INV 0x0020
/* For use with page_set_flags: page is being replaced; target_data cleared. */
#define PAGE_RESET 0x0040
#if defined(CONFIG_BSD) && defined(CONFIG_USER_ONLY)
/* FIXME: Code that sets/uses this is broken and needs to go away. */
#define PAGE_RESERVED 0x0020
#define PAGE_RESERVED 0x0100
#endif
/* Target-specific bits that will be used via page_get_flags(). */
#define PAGE_TARGET_1 0x0080
@ -279,6 +285,30 @@ int walk_memory_regions(void *, walk_memory_regions_fn);
int page_get_flags(target_ulong address);
void page_set_flags(target_ulong start, target_ulong end, int flags);
int page_check_range(target_ulong start, target_ulong len, int flags);
/**
* page_alloc_target_data(address, size)
* @address: guest virtual address
* @size: size of data to allocate
*
* Allocate @size bytes of out-of-band data to associate with the
* guest page at @address. If the page is not mapped, NULL will
* be returned. If there is existing data associated with @address,
* no new memory will be allocated.
*
* The memory will be freed when the guest page is deallocated,
* e.g. with the munmap system call.
*/
void *page_alloc_target_data(target_ulong address, size_t size);
/**
* page_get_target_data(address)
* @address: guest virtual address
*
* Return any out-of-bound memory assocated with the guest page
* at @address, as per page_alloc_target_data.
*/
void *page_get_target_data(target_ulong address);
#endif
CPUArchState *cpu_copy(CPUArchState *env);