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compel/arch/riscv64: properly implement compel_task_size()

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We need to dynamically calculate TASK_SIZE depending
on the MMU on RISC-V system. [We are using analogical
approach on aarch64/ppc64le.]

This change was tested on physical machine:
StarFive VisionFive 2
isa		: rv64imafdc_zicntr_zicsr_zifencei_zihpm_zca_zcd_zba_zbb
mmu		: sv39
uarch		: sifive,u74-mc
mvendorid	: 0x489
marchid		: 0x8000000000000007
mimpid		: 0x4210427
hart isa	: rv64imafdc_zicntr_zicsr_zifencei_zihpm_zca_zcd_zba_zbb

Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
This commit is contained in:
Alexander Mikhalitsyn 2024-11-17 18:32:03 +00:00 • committed by Andrei Vagin
parent 399d7bdcbb
commit 40b7f04b7c
1 changed files with 13 additions and 11 deletions
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24
compel/arch/riscv64/src/lib/infect.c
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@ -181,20 +181,22 @@ int arch_fetch_sas(struct parasite_ctl *ctl, struct rt_sigframe *s)
* Task size is the maximum virtual address space size that a process can occupy in the memory
* Refer to linux kernel arch/riscv/include/asm/pgtable.h,
* task size is:
* - 0x9fc00000 (~2.5GB) for RV32.
* - 0x4000000000 ( 256GB) for RV64 using SV39 mmu
* - 0x800000000000 ( 128TB) for RV64 using SV48 mmu
*
* Note that PGDIR_SIZE must evenly divide TASK_SIZE since "RISC-V
* Instruction Set Manual Volume II: Privileged Architecture" states that
* "load and store effective addresses, which are 64bits, must have bits
* 63–48 all equal to bit 47, or else a page-fault exception will occur."
*/
#define TASK_SIZE 0x800000000000UL // hardcoded for SV48 MMU
* - 0x9fc00000 (~2.5GB) for RV32.
* - 0x4000000000 ( 256GB) for RV64 using SV39 mmu
* - 0x800000000000 ( 128TB) for RV64 using SV48 mmu
* - 0x100000000000000 ( 64PB) for RV64 using SV57 mmu
*/
#define TASK_SIZE_MIN (1UL << 38)
#define TASK_SIZE_MAX (1UL << 56)
unsigned long compel_task_size(void)
{
return TASK_SIZE;
unsigned long task_size;
for (task_size = TASK_SIZE_MIN; task_size < TASK_SIZE_MAX; task_size <<= 1)
if (munmap((void *)task_size, page_size()))
break;
return task_size;
}
/*