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x86: pre-allocate address space

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We no longer use a page pool to draw memory pages when doing
memory map operations. We now preallocate the entire virtual
address space so no allocations are ever necessary when mapping
memory.

We still need memory to clone page tables, but this is now
expressed by a new Kconfig X86_MAX_ADDITIONAL_MEM_DOMAINS
which has much clearer semantics than specifying the number
of pages in the pool.

The default address space size is now 8MB, but this can be
tuned by the application.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2020-12-17 21:12:40 -08:00 • committed by Anas Nashif
commit b0b7756756
19 changed files with 142 additions and 222 deletions
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1
boards/x86/qemu_x86/qemu_x86_64_defconfig
View file

@ -17,4 +17,3 @@ CONFIG_MP_NUM_CPUS=2
CONFIG_X86_MMU=y
CONFIG_X86_VERY_EARLY_CONSOLE=y
CONFIG_QEMU_ICOUNT=n
CONFIG_X86_MMU_PAGE_POOL_PAGES=23

1
boards/x86/qemu_x86/qemu_x86_64_nokpti_defconfig
View file

@ -18,4 +18,3 @@ CONFIG_X86_MMU=y
CONFIG_X86_VERY_EARLY_CONSOLE=y
CONFIG_QEMU_ICOUNT=n
CONFIG_X86_KPTI=n
CONFIG_X86_MMU_PAGE_POOL_PAGES=16

1
boards/x86/qemu_x86/qemu_x86_coverage_defconfig
View file

@ -12,7 +12,6 @@ CONFIG_UART_CONSOLE=y
CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=25000000
CONFIG_TEST_RANDOM_GENERATOR=y
CONFIG_X86_MMU=y
CONFIG_X86_MMU_PAGE_POOL_PAGES=17
CONFIG_DEBUG_INFO=y
CONFIG_SCHED_SCALABLE=y
CONFIG_WAITQ_SCALABLE=y

1
boards/x86/qemu_x86/qemu_x86_defconfig
View file

@ -12,7 +12,6 @@ CONFIG_UART_CONSOLE=y
CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=25000000
CONFIG_TEST_RANDOM_GENERATOR=y
CONFIG_X86_MMU=y
CONFIG_X86_MMU_PAGE_POOL_PAGES=17
CONFIG_DEBUG_INFO=y
CONFIG_SCHED_SCALABLE=y
CONFIG_WAITQ_SCALABLE=y

1
boards/x86/qemu_x86/qemu_x86_nokpti_defconfig
View file

@ -12,7 +12,6 @@ CONFIG_UART_CONSOLE=y
CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=25000000
CONFIG_TEST_RANDOM_GENERATOR=y
CONFIG_X86_MMU=y
CONFIG_X86_MMU_PAGE_POOL_PAGES=12
CONFIG_DEBUG_INFO=y
CONFIG_SCHED_SCALABLE=y
CONFIG_WAITQ_SCALABLE=y

1
boards/x86/qemu_x86/qemu_x86_nopae_defconfig
View file

@ -12,7 +12,6 @@ CONFIG_UART_CONSOLE=y
CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=25000000
CONFIG_TEST_RANDOM_GENERATOR=y
CONFIG_X86_MMU=y
CONFIG_X86_MMU_PAGE_POOL_PAGES=10
CONFIG_DEBUG_INFO=y
CONFIG_SCHED_SCALABLE=y
CONFIG_WAITQ_SCALABLE=y

2
boards/x86/qemu_x86/qemu_x86_tiny.dts
View file

@ -5,5 +5,5 @@
*/
#define DT_DRAM_BASE 0x100000
#define DT_DRAM_SIZE DT_SIZE_K(128)
#define DT_DRAM_SIZE DT_SIZE_K(256)
#include "qemu_x86.dts"

1
boards/x86/qemu_x86/qemu_x86_tiny_defconfig
View file

@ -23,6 +23,5 @@ CONFIG_X86_COMMON_PAGE_TABLE=y
CONFIG_X86_KPTI=n
CONFIG_KERNEL_VM_SIZE=0x400000
CONFIG_KERNEL_VM_BASE=0x0
CONFIG_X86_MMU_PAGE_POOL_PAGES=0
CONFIG_KERNEL_VM_OFFSET=0x100000
CONFIG_X86_KERNEL_OFFSET=0