Re: [PATCH 20/31] mips/kvm: Hook into TLB fault handlers.

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On 06/07/2013 04:34 PM, Sergei Shtylyov wrote:
Hello.

On 06/08/2013 03:03 AM, David Daney wrote:

From: David Daney <david.daney@xxxxxxxxxx>

If the CPU is operating in guest mode when a TLB related excpetion
occurs, give KVM a chance to do emulation.

Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
---
  arch/mips/mm/fault.c       | 8 ++++++++
  arch/mips/mm/tlbex-fault.S | 6 ++++++
  2 files changed, 14 insertions(+)

diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c
index 0fead53..9391da49 100644
--- a/arch/mips/mm/fault.c
+++ b/arch/mips/mm/fault.c
[...]
@@ -50,6 +51,13 @@ asmlinkage void __kprobes do_page_fault(struct
pt_regs *regs, unsigned long writ
             field, regs->cp0_epc);
  #endif
+#ifdef CONFIG_KVM_MIPSVZ
+    if (test_tsk_thread_flag(current, TIF_GUESTMODE)) {
+        if (mipsvz_page_fault(regs, write, address))

    Any reason not to collapse these into single *if*?


It makes the conditional call to mipsvz_page_fault() less obvious.

Certainly the same semantics can be achieved several different ways.

David Daney


+            return;
+    }
+#endif
+





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