linux-kernel - [PATCH 1/2] kvm tools: fix repeated io emulation

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Date:	Thu, 18 Aug 2011 11:06:54 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: [PATCH 1/2] kvm tools: fix repeated io emulation

When kvm emulates repeation io read instruction, it can exit to user-space with
'count' > 1, we need to emulate io access for many times

Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
---
 tools/kvm/ioport.c |   17 +++++++++++------
 1 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/tools/kvm/ioport.c b/tools/kvm/ioport.c
index 2d69ae4..6b0bd30 100644
--- a/tools/kvm/ioport.c
+++ b/tools/kvm/ioport.c
@@ -129,6 +129,7 @@ bool kvm__emulate_io(struct kvm *kvm, u16 port, void *data, int direction, int s
 	struct ioport_operations *ops;
 	bool ret = false;
 	struct ioport *entry;
+	void *ptr = data;
 
 	br_read_lock();
 	entry = ioport_search(&ioport_tree, port);
@@ -137,12 +138,16 @@ bool kvm__emulate_io(struct kvm *kvm, u16 port, void *data, int direction, int s
 
 	ops	= entry->ops;
 
-	if (direction == KVM_EXIT_IO_IN) {
-		if (ops->io_in)
-			ret = ops->io_in(entry, kvm, port, data, size, count);
-	} else {
-		if (ops->io_out)
-			ret = ops->io_out(entry, kvm, port, data, size, count);
+	while (count--) {
+		if (direction == KVM_EXIT_IO_IN) {
+			if (ops->io_in)
+				ret = ops->io_in(entry, kvm, port, ptr, size, count);
+		} else {
+			if (ops->io_out)
+				ret = ops->io_out(entry, kvm, port, ptr, size, count);
+		}
+
+		ptr += size;
 	}
 
 	br_read_unlock();
-- 
1.7.5.4
--
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