# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1233748806 0
# Node ID 6058887e55d7096f8b32c1f0576c601b080dc879
# Parent 7e15ccb7bbd88e550ada6a6b86196cc4e5d880b6
vtd: Add a boot parameter option for snoop control capability for VT-d.
The default is to use snoop control.
Signed-off-by: Xin, Xiaohui <xiaohui.xin@xxxxxxxxx>
---
xen/drivers/passthrough/iommu.c | 7 +++++++
xen/drivers/passthrough/vtd/dmar.c | 16 +++++++++-------
2 files changed, 16 insertions(+), 7 deletions(-)
diff -r 7e15ccb7bbd8 -r 6058887e55d7 xen/drivers/passthrough/iommu.c
--- a/xen/drivers/passthrough/iommu.c Wed Feb 04 11:58:25 2009 +0000
+++ b/xen/drivers/passthrough/iommu.c Wed Feb 04 12:00:06 2009 +0000
@@ -33,6 +33,8 @@ int amd_iov_detect(void);
* no-pv Disable IOMMU for PV domains (default)
* force|required Don't boot unless IOMMU is enabled
* passthrough Bypass VT-d translation for Dom0
+ * snoop Utilize the snoop control for IOMMU (default)
+ * no-snoop Dont utilize the snoop control for IOMMU
*/
custom_param("iommu", parse_iommu_param);
int iommu_enabled = 0;
@@ -45,6 +47,7 @@ static void __init parse_iommu_param(cha
{
char *ss;
iommu_enabled = 1;
+ iommu_snoop = 1;
do {
ss = strchr(s, ',');
@@ -62,6 +65,10 @@ static void __init parse_iommu_param(cha
force_iommu = 1;
else if ( !strcmp(s, "passthrough") )
iommu_passthrough = 1;
+ else if ( !strcmp(s, "snoop") )
+ iommu_snoop = 1;
+ else if ( !strcmp(s, "no-snoop") )
+ iommu_snoop = 0;
s = ss + 1;
} while ( ss );
diff -r 7e15ccb7bbd8 -r 6058887e55d7 xen/drivers/passthrough/vtd/dmar.c
--- a/xen/drivers/passthrough/vtd/dmar.c Wed Feb 04 11:58:25 2009 +0000
+++ b/xen/drivers/passthrough/vtd/dmar.c Wed Feb 04 12:00:06 2009 +0000
@@ -540,13 +540,15 @@ int acpi_dmar_init(void)
/* Giving that all devices within guest use same io page table,
* enable snoop control only if all VT-d engines support it.
*/
- iommu_snoop = 1;
- for_each_drhd_unit ( drhd )
- {
- iommu = drhd->iommu;
- if ( !ecap_snp_ctl(iommu->ecap) ) {
- iommu_snoop = 0;
- break;
+ if ( iommu_snoop )
+ {
+ for_each_drhd_unit ( drhd )
+ {
+ iommu = drhd->iommu;
+ if ( !ecap_snp_ctl(iommu->ecap) ) {
+ iommu_snoop = 0;
+ break;
+ }
}
}
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