提交 138f7ad9 编写于 作者: J James Hogan 提交者: Paolo Bonzini

MIPS: KVM: Clean up TLB management hazards

KVM's host TLB handling routines were using tlbw hazard barrier macros
around tlb_read(). Now that hazard barrier macros exist for tlbr, update
this case to use them.

Also fix various other unnecessary hazard barriers in this code.
Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
上级 878edf01
......@@ -195,7 +195,6 @@ int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi,
/* Restore old ASID */
write_c0_entryhi(old_entryhi);
mtc0_tlbw_hazard();
tlbw_use_hazard();
local_irq_restore(flags);
return 0;
}
......@@ -219,15 +218,11 @@ int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
old_entryhi = read_c0_entryhi();
vaddr = badvaddr & (PAGE_MASK << 1);
write_c0_entryhi(vaddr | kvm_mips_get_kernel_asid(vcpu));
mtc0_tlbw_hazard();
write_c0_entrylo0(entrylo0);
mtc0_tlbw_hazard();
write_c0_entrylo1(entrylo1);
mtc0_tlbw_hazard();
write_c0_index(kvm_mips_get_commpage_asid(vcpu));
mtc0_tlbw_hazard();
tlb_write_indexed();
mtc0_tlbw_hazard();
tlbw_use_hazard();
kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0 (R): 0x%08lx, entrylo1(R): 0x%08lx\n",
......@@ -237,7 +232,6 @@ int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
/* Restore old ASID */
write_c0_entryhi(old_entryhi);
mtc0_tlbw_hazard();
tlbw_use_hazard();
local_irq_restore(flags);
return 0;
......@@ -291,7 +285,6 @@ int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr)
/* Restore old ASID */
write_c0_entryhi(old_entryhi);
mtc0_tlbw_hazard();
tlbw_use_hazard();
local_irq_restore(flags);
......@@ -322,21 +315,16 @@ int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va)
if (idx > 0) {
write_c0_entryhi(UNIQUE_ENTRYHI(idx));
mtc0_tlbw_hazard();
write_c0_entrylo0(0);
mtc0_tlbw_hazard();
write_c0_entrylo1(0);
mtc0_tlbw_hazard();
tlb_write_indexed();
mtc0_tlbw_hazard();
tlbw_use_hazard();
}
write_c0_entryhi(old_entryhi);
mtc0_tlbw_hazard();
tlbw_use_hazard();
local_irq_restore(flags);
......@@ -364,11 +352,11 @@ void kvm_mips_flush_host_tlb(int skip_kseg0)
/* Blast 'em all away. */
for (entry = 0; entry < maxentry; entry++) {
write_c0_index(entry);
mtc0_tlbw_hazard();
if (skip_kseg0) {
mtc0_tlbr_hazard();
tlb_read();
tlbw_use_hazard();
tlb_read_hazard();
entryhi = read_c0_entryhi();
......@@ -379,22 +367,17 @@ void kvm_mips_flush_host_tlb(int skip_kseg0)
/* Make sure all entries differ. */
write_c0_entryhi(UNIQUE_ENTRYHI(entry));
mtc0_tlbw_hazard();
write_c0_entrylo0(0);
mtc0_tlbw_hazard();
write_c0_entrylo1(0);
mtc0_tlbw_hazard();
tlb_write_indexed();
mtc0_tlbw_hazard();
tlbw_use_hazard();
}
tlbw_use_hazard();
write_c0_entryhi(old_entryhi);
write_c0_pagemask(old_pagemask);
mtc0_tlbw_hazard();
tlbw_use_hazard();
local_irq_restore(flags);
}
......@@ -419,9 +402,9 @@ void kvm_local_flush_tlb_all(void)
write_c0_index(entry);
mtc0_tlbw_hazard();
tlb_write_indexed();
tlbw_use_hazard();
entry++;
}
tlbw_use_hazard();
write_c0_entryhi(old_ctx);
mtc0_tlbw_hazard();
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册