Re: [PATCH 02/11] Add "handle page fault" PV helper.

From: Rik van Riel
Date: Mon Nov 02 2009 - 14:04:01 EST

On 11/02/2009 04:22 AM, Ingo Molnar wrote:

* Gleb Natapov<gleb@xxxxxxxxxx> wrote:

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index f4cee90..14707dc 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -952,6 +952,9 @@ do_page_fault(struct pt_regs *regs, unsigned long error_code)
int write;
int fault;

+ if (arch_handle_page_fault(regs, error_code))
+ return;

This patch is not acceptable unless it's done cleaner. Currently we
already have 3 callbacks in do_page_fault() (kmemcheck, mmiotrace,
notifier), and this adds a fourth one.

There's another alternative - add our own exception vector
for async page faults. Not sure if that is warranted though,
especially if we already have other callbacks in do_page_fault()
and we can consolidate them.

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