In a recent commit (99f85a28a78e96d28907fe036e1671a218fee597), KVM
disabled the passthrough of this port due to known problems on certain
HP laptops (see http://lkml.indiana.edu/hypermail/linux/kernel/0712.3/0872.html
and http://lkml.indiana.edu/hypermail/linux/kernel/0801.0/2388.html).
For Xen, don't do this globally, but rather based on a DMI black list.
It may be worth considering to add a platform hypercall instead, so
that the knowledge Dom0 already may have can be utilized in Xen - and
in particular to not have the need to keep the list of affected systems
in sync with Linux'.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
--- 2009-06-10.orig/xen/arch/x86/hvm/hvm.c 2009-06-10 11:22:25.000000000
+0200
+++ 2009-06-10/xen/arch/x86/hvm/hvm.c 2009-06-10 13:54:49.000000000 +0200
@@ -33,6 +33,7 @@
#include <xen/guest_access.h>
#include <xen/event.h>
#include <xen/paging.h>
+#include <xen/dmi.h>
#include <asm/shadow.h>
#include <asm/hap.h>
#include <asm/current.h>
@@ -69,6 +70,77 @@ struct hvm_function_table hvm_funcs __re
unsigned long __attribute__ ((__section__ (".bss.page_aligned")))
hvm_io_bitmap[3*PAGE_SIZE/BYTES_PER_LONG];
+static int hvm_port80_allowed = -1;
+boolean_param("hvm_port80", hvm_port80_allowed);
+
+static int __init dmi_hvm_deny_port80(/*const*/ struct dmi_system_id *id)
+{
+ printk(XENLOG_WARNING "%s: port 0x80 access %s allowed for HVM guests\n",
+ id->ident, hvm_port80_allowed > 0 ? "forcibly" : "not");
+
+ if ( hvm_port80_allowed < 0 )
+ hvm_port80_allowed = 0;
+
+ return 0;
+}
+
+static int __init check_port80(void)
+{
+ /*
+ * Quirk table for systems that misbehave (lock up, etc.) if port
+ * 0x80 is used:
+ */
+ static struct dmi_system_id __initdata hvm_no_port80_dmi_table[] =
+ {
+ {
+ .callback = dmi_hvm_deny_port80,
+ .ident = "Compaq Presario V6000",
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"),
+ DMI_MATCH(DMI_BOARD_NAME, "30B7")
+ }
+ },
+ {
+ .callback = dmi_hvm_deny_port80,
+ .ident = "HP Pavilion dv9000z",
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"),
+ DMI_MATCH(DMI_BOARD_NAME, "30B9")
+ }
+ },
+ {
+ .callback = dmi_hvm_deny_port80,
+ .ident = "HP Pavilion dv6000",
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"),
+ DMI_MATCH(DMI_BOARD_NAME, "30B8")
+ }
+ },
+ {
+ .callback = dmi_hvm_deny_port80,
+ .ident = "HP Pavilion tx1000",
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"),
+ DMI_MATCH(DMI_BOARD_NAME, "30BF")
+ }
+ },
+ {
+ .callback = dmi_hvm_deny_port80,
+ .ident = "Presario F700",
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"),
+ DMI_MATCH(DMI_BOARD_NAME, "30D3")
+ }
+ },
+ { }
+ };
+
+ dmi_check_system(hvm_no_port80_dmi_table);
+
+ return 0;
+}
+__initcall(check_port80);
+
void hvm_enable(struct hvm_function_table *fns)
{
BUG_ON(hvm_enabled);
@@ -79,7 +151,8 @@ void hvm_enable(struct hvm_function_tabl
* often used for I/O delays, but the vmexits simply slow things down).
*/
memset(hvm_io_bitmap, ~0, sizeof(hvm_io_bitmap));
- __clear_bit(0x80, hvm_io_bitmap);
+ if ( hvm_port80_allowed )
+ __clear_bit(0x80, hvm_io_bitmap);
__clear_bit(0xed, hvm_io_bitmap);
hvm_funcs = *fns;
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