Re: [PATCH] iommu/amd: Fix legacy interrupt remapping for x2APIC-enabled system

2020-05-01 Thread Joerg Roedel 
On Wed, Apr 22, 2020 at 08:30:02AM -0500, Suravee Suthikulpanit wrote:
> Currently, system fails to boot because the legacy interrupt remapping
> mode does not enable 128-bit IRTE (GA), which is required for x2APIC
> support.
> 
> Fix by using AMD_IOMMU_GUEST_IR_LEGACY_GA mode when booting with
> kernel option amd_iommu_intr=legacy instead. The initialization
> logic will check GASup and automatically fallback to using
> AMD_IOMMU_GUEST_IR_LEGACY if GA mode is not supported.
> 
> Fixes: 3928aa3f5775 ("iommu/amd: Detect and enable guest vAPIC support")
> Signed-off-by: Suravee Suthikulpanit 
> ---
>  drivers/iommu/amd_iommu_init.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied for v5.7, thanks Suravee.
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Re: [PATCH] iommu/amd: Fix legacy interrupt remapping for x2APIC-enabled system

2020-04-25 Thread Suravee Suthikulpanit 

Ping.

Thanks,
Suravee

On 4/22/20 8:30 PM, Suravee Suthikulpanit wrote:

Currently, system fails to boot because the legacy interrupt remapping
mode does not enable 128-bit IRTE (GA), which is required for x2APIC
support.

Fix by using AMD_IOMMU_GUEST_IR_LEGACY_GA mode when booting with
kernel option amd_iommu_intr=legacy instead. The initialization
logic will check GASup and automatically fallback to using
AMD_IOMMU_GUEST_IR_LEGACY if GA mode is not supported.

Fixes: 3928aa3f5775 ("iommu/amd: Detect and enable guest vAPIC support")
Signed-off-by: Suravee Suthikulpanit 
---
  drivers/iommu/amd_iommu_init.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 6be3853..2b9a67e 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -2936,7 +2936,7 @@ static int __init parse_amd_iommu_intr(char *str)
  {
for (; *str; ++str) {
if (strncmp(str, "legacy", 6) == 0) {
-   amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY;
+   amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY_GA;
break;
}
if (strncmp(str, "vapic", 5) == 0) {


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[PATCH] iommu/amd: Fix legacy interrupt remapping for x2APIC-enabled system

2020-04-22 Thread Suravee Suthikulpanit 
Currently, system fails to boot because the legacy interrupt remapping
mode does not enable 128-bit IRTE (GA), which is required for x2APIC
support.

Fix by using AMD_IOMMU_GUEST_IR_LEGACY_GA mode when booting with
kernel option amd_iommu_intr=legacy instead. The initialization
logic will check GASup and automatically fallback to using
AMD_IOMMU_GUEST_IR_LEGACY if GA mode is not supported.

Fixes: 3928aa3f5775 ("iommu/amd: Detect and enable guest vAPIC support")
Signed-off-by: Suravee Suthikulpanit 
---
 drivers/iommu/amd_iommu_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 6be3853..2b9a67e 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -2936,7 +2936,7 @@ static int __init parse_amd_iommu_intr(char *str)
 {
for (; *str; ++str) {
if (strncmp(str, "legacy", 6) == 0) {
-   amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY;
+   amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY_GA;
break;
}
if (strncmp(str, "vapic", 5) == 0) {
-- 
1.8.3.1

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