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vmm: make fork use copy-on-write

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Matheus
2023-08-02 19:55:53 -03:00
parent 5fad76e39e
commit 245da66fc3
1 changed files with 4 additions and 9 deletions
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kernel-src/mm/vmm.c
+4 -9
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@@ -352,9 +352,8 @@ bool vmm_pagefault(void *addr, bool user, int actions) {
printf("vmm: out of memory to do copy on write on address space\n"); printf("vmm: out of memory to do copy on write on address space\n");
status = false; status = false;
} else { } else {
// this assert should always succeed, here just to make sure
memcpy(MAKE_HHDM(newphys), MAKE_HHDM(oldphys), PAGE_SIZE); memcpy(MAKE_HHDM(newphys), MAKE_HHDM(oldphys), PAGE_SIZE);
__assert(arch_mmu_map(_cpu()->vmmctx->pagetable, newphys, addr, range->mmuflags)); arch_mmu_remap(_cpu()->vmmctx->pagetable, newphys, addr, range->mmuflags);
pmm_release(oldphys); pmm_release(oldphys);
status = true; status = true;
} }
@@ -556,14 +555,10 @@ vmmcontext_t *vmm_fork(vmmcontext_t *oldcontext) {
if (phys == NULL) if (phys == NULL)
continue; continue;
void *palloc = pmm_allocpage(PMM_SECTION_DEFAULT); if (arch_mmu_map(newcontext->pagetable, phys, vaddr, newrange->mmuflags & ~ARCH_MMU_FLAGS_WRITE) == false)
if (palloc == NULL)
goto error; goto error;
pmm_hold(phys);
if (arch_mmu_map(newcontext->pagetable, palloc, vaddr, newrange->mmuflags) == false) arch_mmu_remap(oldcontext->pagetable, phys, vaddr, newrange->mmuflags & ~ARCH_MMU_FLAGS_WRITE);
goto error;
memcpy(MAKE_HHDM(palloc), MAKE_HHDM(phys), PAGE_SIZE);
} }
range = range->next; range = range->next;