diff options
| author | Tiwei Bie <tiwei.btw@antgroup.com> | 2025-10-27 08:18:12 +0800 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2025-10-27 16:41:15 +0100 |
| commit | 1e4ee5135d814fe4785890790cec81c3132888fb (patch) | |
| tree | b88d4e37829af3c801081a25d2a08ce23600f59c /arch/um/kernel/tlb.c | |
| parent | 9c82de55d4783e906f18219f833ad97fd8d9c5df (diff) | |
um: Add initial SMP support
Add initial symmetric multi-processing (SMP) support to UML. With
this support enabled, users can tell UML to start multiple virtual
processors, each represented as a separate host thread.
In UML, kthreads and normal threads (when running in kernel mode)
can be scheduled and executed simultaneously on different virtual
processors. However, the userspace code of normal threads still
runs within their respective single-threaded stubs.
That is, SMP support is currently available both within the kernel
and across different processes, but still remains limited within
threads of the same process in userspace.
Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Link: https://patch.msgid.link/20251027001815.1666872-6-tiwei.bie@linux.dev
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'arch/um/kernel/tlb.c')
| -rw-r--r-- | arch/um/kernel/tlb.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c index cf7e0d4407f2..39608cccf2c6 100644 --- a/arch/um/kernel/tlb.c +++ b/arch/um/kernel/tlb.c @@ -162,9 +162,11 @@ int um_tlb_sync(struct mm_struct *mm) { pgd_t *pgd; struct vm_ops ops; - unsigned long addr = mm->context.sync_tlb_range_from, next; + unsigned long addr, next; int ret = 0; + guard(spinlock_irqsave)(&mm->context.sync_tlb_lock); + if (mm->context.sync_tlb_range_to == 0) return 0; @@ -177,6 +179,7 @@ int um_tlb_sync(struct mm_struct *mm) ops.unmap = unmap; } + addr = mm->context.sync_tlb_range_from; pgd = pgd_offset(mm, addr); do { next = pgd_addr_end(addr, mm->context.sync_tlb_range_to); |