On 24/06/14 18:31, Deng-Cheng Zhu wrote:
From: Deng-Cheng Zhu dengcheng@imgtec.com
At TLB initialization, the commpage TLB entry is reserved on top of the
existing WIRED entries (the number not necessarily be 0).
Signed-off-by: Deng-Cheng Zhu dengcheng@imgtec.com
---
arch/mips/kvm/mips.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 27250ee..3d53d34 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -170,7 +170,7 @@ void kvm_arch_sync_events(struct kvm *kvm)
static void kvm_mips_uninit_tlbs(void *arg)
{
/* Restore wired count */
- write_c0_wired(0);
+ write_c0_wired(read_c0_wired() - 1);
mtc0_tlbw_hazard();
/* Clear out all the TLBs */
kvm_local_flush_tlb_all();
kvm_local_flush_tlb_all blasts all the entries away regardless of wired,
so I don't think this is an improvement.
I suspect to really be safe/correct in the presence of other dynamic
users of wired it would have to either manage arbitrary
allocation/deallocation of per-cpu tlb entries correctly from a single
place, or abandon the use of wired altogether.
Cheers
James
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