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vmm: redo tlb shootdowns

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Matheus
2024-09-16 21:37:10 -03:00
parent 80abd907a8
commit f47236f7eb
3 changed files with 51 additions and 13 deletions
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kernel-src/mm/vmm.c
+31 -4
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@@ -317,9 +317,13 @@ static int changemap(vmmspace_t *space, void *address, size_t size, bool free, i
int error = 0;
while (range) {
while (range && range->start >= top) {
__assert(range != space->ranges || range->prev == NULL);
void *rangetop = RANGE_TOP(range);
if ((uintptr_t)range->start >= (uintptr_t)address + size)
break;
vmmrange_t *nextsave = range->next;
if (range->start >= address && rangetop <= top) {
// completely changed
if (free) {
@@ -452,7 +456,7 @@ static int changemap(vmmspace_t *space, void *address, size_t size, bool free, i
if (free) {
destroyrange(range, range->size, difference, 0);
} else {
newrange->start = (void *)((uintptr_t)range->start + difference);
newrange->start = (void *)((uintptr_t)range->start + range->size + difference);
newrange->size = difference;
newrange->flags = range->flags;
newrange->mmuflags = newmmuflags;
@@ -461,7 +465,7 @@ static int changemap(vmmspace_t *space, void *address, size_t size, bool free, i
if (range->flags & VMM_FLAGS_FILE) {
newrange->vnode = range->vnode;
newrange->offset = range->offset + difference;
newrange->offset = range->offset + range->size + difference;
VOP_HOLD(range->vnode);
}
@@ -474,7 +478,7 @@ static int changemap(vmmspace_t *space, void *address, size_t size, bool free, i
}
}
range = range->next;
range = nextsave;
}
leave:
@@ -500,7 +504,10 @@ int vmm_changemmuflags(void *base, size_t size, mmuflags_t mmuflags, int flags)
return ENOMEM;
MUTEX_ACQUIRE(&space->lock, false);
int error = changemap(space, base, size, false, flags, mmuflags);
arch_mmu_invalidate_range(base, size);
MUTEX_RELEASE(&space->lock);
return error;
}
@@ -634,6 +641,7 @@ bool vmm_pagefault(void *addr, bool user, int actions) {
} else {
memcpy(MAKE_HHDM(newphys), MAKE_HHDM(oldphys), PAGE_SIZE);
arch_mmu_remap(current_vmm_context()->pagetable, newphys, addr, range->mmuflags);
arch_mmu_invalidate_range(addr, PAGE_SIZE);
if ((range->flags & VMM_FLAGS_FILE) == 0 || vfs_iscacheable(range->vnode))
pmm_release(oldphys);
@@ -704,6 +712,10 @@ void *vmm_map(void *addr, volatile size_t size, int flags, mmuflags_t mmuflags,
range->flags = VMM_PERMANENT_FLAGS_MASK & flags;
range->mmuflags = mmuflags;
__assert((flags & (VMM_FLAGS_ALLOCATE | VMM_FLAGS_PHYSICAL)) == 0);
// make the memory inacessible
changemap(space, addr, size, false, flags, 0);
arch_mmu_invalidate_range(addr, size);
// and then free it
changemap(space, addr, size, true, flags, 0);
} else {
retaddr = start;
@@ -729,6 +741,8 @@ void *vmm_map(void *addr, volatile size_t size, int flags, mmuflags_t mmuflags,
for (uintmax_t j = 0; j < size; j += PAGE_SIZE)
arch_mmu_unmap(current_vmm_context()->pagetable, (void *)((uintptr_t)start + j));
// invalidate here just to be sure
arch_mmu_invalidate_range(start, size);
retaddr = NULL;
goto cleanup;
}
@@ -753,6 +767,8 @@ void *vmm_map(void *addr, volatile size_t size, int flags, mmuflags_t mmuflags,
}
}
// invalidate here just to be sure
arch_mmu_invalidate_range(start, size);
retaddr = NULL;
goto cleanup;
}
@@ -785,7 +801,14 @@ void vmm_unmap(void *addr, size_t size, int flags) {
return;
MUTEX_ACQUIRE(&space->lock, false);
// make memory inacessible
changemap(space, addr, size, false, flags, 0);
arch_mmu_invalidate_range(addr, size);
// and then free it
changemap(space, addr, size, true, flags, 0);
MUTEX_RELEASE(&space->lock);
}
@@ -858,13 +881,17 @@ vmmcontext_t *vmm_fork(vmmcontext_t *oldcontext) {
if (arch_mmu_map(newcontext->pagetable, phys, vaddr, newrange->mmuflags & ~ARCH_MMU_FLAGS_WRITE) == false)
goto error;
pmm_hold(phys);
arch_mmu_remap(oldcontext->pagetable, phys, vaddr, newrange->mmuflags & ~ARCH_MMU_FLAGS_WRITE);
}
range = range->next;
}
arch_mmu_invalidate_range(NULL, 0);
MUTEX_RELEASE(&oldcontext->space.lock);
return newcontext;
error: