diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/exec/cpu-all.h | 9 | ||||
| -rw-r--r-- | include/hw/boards.h | 7 | ||||
| -rw-r--r-- | include/qemu-common.h | 12 |
3 files changed, 28 insertions, 0 deletions
diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h index b6a705982f..861260d3db 100644 --- a/include/exec/cpu-all.h +++ b/include/exec/cpu-all.h @@ -189,6 +189,15 @@ void address_space_stq(AddressSpace *as, hwaddr addr, uint64_t val, /* page related stuff */ +#ifdef TARGET_PAGE_BITS_VARY +extern bool target_page_bits_decided; +extern int target_page_bits; +#define TARGET_PAGE_BITS ({ assert(target_page_bits_decided); \ + target_page_bits; }) +#else +#define TARGET_PAGE_BITS_MIN TARGET_PAGE_BITS +#endif + #define TARGET_PAGE_SIZE (1 << TARGET_PAGE_BITS) #define TARGET_PAGE_MASK ~(TARGET_PAGE_SIZE - 1) #define TARGET_PAGE_ALIGN(addr) (((addr) + TARGET_PAGE_SIZE - 1) & TARGET_PAGE_MASK) diff --git a/include/hw/boards.h b/include/hw/boards.h index e46a744bcd..a51da9c440 100644 --- a/include/hw/boards.h +++ b/include/hw/boards.h @@ -86,6 +86,12 @@ typedef struct { * Returns a @HotpluggableCPUList, which describes CPUs objects which * could be added with -device/device_add. * Caller is responsible for freeing returned list. + * @minimum_page_bits: + * If non-zero, the board promises never to create a CPU with a page size + * smaller than this, so QEMU can use a more efficient larger page + * size than the target architecture's minimum. (Attempting to create + * such a CPU will fail.) Note that changing this is a migration + * compatibility break for the machine. */ struct MachineClass { /*< private >*/ @@ -124,6 +130,7 @@ struct MachineClass { ram_addr_t default_ram_size; bool option_rom_has_mr; bool rom_file_has_mr; + int minimum_page_bits; HotplugHandler *(*get_hotplug_handler)(MachineState *machine, DeviceState *dev); diff --git a/include/qemu-common.h b/include/qemu-common.h index 9e8b0bd991..7e6e4feb4b 100644 --- a/include/qemu-common.h +++ b/include/qemu-common.h @@ -82,6 +82,18 @@ bool tcg_enabled(void); void cpu_exec_init_all(void); /** + * set_preferred_target_page_bits: + * @bits: number of bits needed to represent an address within the page + * + * Set the preferred target page size (the actual target page + * size may be smaller than any given CPU's preference). + * Returns true on success, false on failure (which can only happen + * if this is called after the system has already finalized its + * choice of page size and the requested page size is smaller than that). + */ +bool set_preferred_target_page_bits(int bits); + +/** * Sends a (part of) iovec down a socket, yielding when the socket is full, or * Receives data into a (part of) iovec from a socket, * yielding when there is no data in the socket. |