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Allow direct guest access to PC debug port

PATCH Applied Anthony Liguori 2 participants 2 messages Apr 29, 2007 – Apr 30, 2007 1 message not in the archive KVM

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Anthony Liguori

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#0 lore raw

PATCH 1/1 Allow direct guest access to PC debug port

This was inspired by Qing He's similar patch for VT.

Regards,

Anthony Liguori

Subject: [PATCH][SVM] Allow direct guest access to PC debug port
From: Anthony Liguori <aliguori-r/[email protected]>

The PC debug port is used for IO delay and does not require emulation.

Signed-off-by Anthony Liguori <aliguori-r/[email protected]>
drivers/kvm/svm.c +5 -3
Index: kernel/drivers/kvm/svm.c
===================================================================
@@ -377,7 +377,7 @@
 	int cpu;
 	struct page *iopm_pages;
 	struct page *msrpm_pages;
-	void *msrpm_va;
+	void *iopm_va, *msrpm_va;
 	int r;
 
 	kvm_emulator_want_group7_invlpg();

@@ -386,8 +386,10 @@
 
 	if (!iopm_pages)
 		return -ENOMEM;
-	memset(page_address(iopm_pages), 0xff,
-					PAGE_SIZE * (1 << IOPM_ALLOC_ORDER));
+
+	iopm_va = page_address(iopm_pages);
+	memset(iopm_va, 0xff, PAGE_SIZE * (1 << IOPM_ALLOC_ORDER));
+	clear_bit(0x80, iopm_va); /* allow direct access to PC debug port */
 	iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT;

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A message that is not in the archive (sent off-list or not yet received): 4634CCFC.40507-r/[email protected]

Applied
#2 lore raw
Quoted 2 lines · Anthony Liguori

This was inspired by Qing He's similar patch for VT.

Applied, thanks.

Signature · 8 lines
error compiling committee.c: too many arguments to function


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