* [PATCH v2 0/2] Misc cleanup for iommu/vt-d
@ 2023-06-02 2:05 Yanfei Xu
2023-06-02 2:05 ` [PATCH v2 1/2] iommu/vt-d: Handle the failure case of dmar_reenable_qi() Yanfei Xu
2023-06-02 2:05 ` [PATCH v2 2/2] iommu/vt-d: Remove two WARN_ON in domain_context_mapping_one() Yanfei Xu
0 siblings, 2 replies; 5+ messages in thread
From: Yanfei Xu @ 2023-06-02 2:05 UTC (permalink / raw)
To: dwmw2, baolu.lu, joro, will, robin.murphy; +Cc: iommu, linux-kernel, yanfei.xu
No functional changes expected.
v1->v2:
1.Change to use check and return for dmar_reenable_qi()
2.Remove WARN_ON of 'table' instead of using BUG_ON
3.Also remove useless WARN_ON of domain id
Thanks for Baolu's suggestion!
Yanfei Xu (2):
iommu/vt-d: Handle the failure case of dmar_reenable_qi()
iommu/vt-d: Remove two WARN_ON in domain_context_mapping_one()
drivers/iommu/intel/iommu.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
--
2.34.1
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v2 1/2] iommu/vt-d: Handle the failure case of dmar_reenable_qi()
2023-06-02 2:05 [PATCH v2 0/2] Misc cleanup for iommu/vt-d Yanfei Xu
@ 2023-06-02 2:05 ` Yanfei Xu
2023-06-02 9:27 ` Robin Murphy
2023-06-02 2:05 ` [PATCH v2 2/2] iommu/vt-d: Remove two WARN_ON in domain_context_mapping_one() Yanfei Xu
1 sibling, 1 reply; 5+ messages in thread
From: Yanfei Xu @ 2023-06-02 2:05 UTC (permalink / raw)
To: dwmw2, baolu.lu, joro, will, robin.murphy; +Cc: iommu, linux-kernel, yanfei.xu
dmar_reenable_qi() may not succeed. Check and return when it fails.
Signed-off-by: Yanfei Xu <yanfei.xu@intel.com>
---
drivers/iommu/intel/iommu.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 8096273b034c..e9188d045609 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -2967,10 +2967,14 @@ static int init_iommu_hw(void)
{
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu = NULL;
+ int ret;
- for_each_active_iommu(iommu, drhd)
+ for_each_active_iommu(iommu, drhd) {
if (iommu->qi)
- dmar_reenable_qi(iommu);
+ ret = dmar_reenable_qi(iommu);
+ if (ret)
+ return ret;
+ }
for_each_iommu(iommu, drhd) {
if (drhd->ignored) {
--
2.34.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v2 2/2] iommu/vt-d: Remove two WARN_ON in domain_context_mapping_one()
2023-06-02 2:05 [PATCH v2 0/2] Misc cleanup for iommu/vt-d Yanfei Xu
2023-06-02 2:05 ` [PATCH v2 1/2] iommu/vt-d: Handle the failure case of dmar_reenable_qi() Yanfei Xu
@ 2023-06-02 2:05 ` Yanfei Xu
1 sibling, 0 replies; 5+ messages in thread
From: Yanfei Xu @ 2023-06-02 2:05 UTC (permalink / raw)
To: dwmw2, baolu.lu, joro, will, robin.murphy; +Cc: iommu, linux-kernel, yanfei.xu
Remove the WARN_ON(did == 0) as the domain id 0 is reserved and
set once the domain_ids is allocated. So iommu_init_domains will
never return 0.
Remvoe the WARN_ON(!table) as this pointer will be accessed in
the following code, if empty "table" really happens, the kernel
will report a NULL pointer reference warning at the first place.
Signed-off-by: Yanfei Xu <yanfei.xu@intel.com>
---
drivers/iommu/intel/iommu.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index e9188d045609..3953dd69200d 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -1897,8 +1897,6 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
struct context_entry *context;
int ret;
- WARN_ON(did == 0);
-
if (hw_pass_through && domain_type_is_si(domain))
translation = CONTEXT_TT_PASS_THROUGH;
@@ -1944,8 +1942,6 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
if (sm_supported(iommu)) {
unsigned long pds;
- WARN_ON(!table);
-
/* Setup the PASID DIR pointer: */
pds = context_get_sm_pds(table);
context->lo = (u64)virt_to_phys(table->table) |
--
2.34.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v2 1/2] iommu/vt-d: Handle the failure case of dmar_reenable_qi()
2023-06-02 2:05 ` [PATCH v2 1/2] iommu/vt-d: Handle the failure case of dmar_reenable_qi() Yanfei Xu
@ 2023-06-02 9:27 ` Robin Murphy
2023-06-02 10:06 ` Yanfei Xu
0 siblings, 1 reply; 5+ messages in thread
From: Robin Murphy @ 2023-06-02 9:27 UTC (permalink / raw)
To: Yanfei Xu, dwmw2, baolu.lu, joro, will; +Cc: iommu, linux-kernel
On 2023-06-02 03:05, Yanfei Xu wrote:
> dmar_reenable_qi() may not succeed. Check and return when it fails.
>
> Signed-off-by: Yanfei Xu <yanfei.xu@intel.com>
> ---
> drivers/iommu/intel/iommu.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index 8096273b034c..e9188d045609 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -2967,10 +2967,14 @@ static int init_iommu_hw(void)
> {
> struct dmar_drhd_unit *drhd;
> struct intel_iommu *iommu = NULL;
> + int ret;
>
> - for_each_active_iommu(iommu, drhd)
> + for_each_active_iommu(iommu, drhd) {
> if (iommu->qi)
> - dmar_reenable_qi(iommu);
> + ret = dmar_reenable_qi(iommu);
> + if (ret)
Nit: either this should be inside the previous condition, or you need to
initialise ret to 0.
Thanks,
Robin.
> + return ret;
> + }
>
> for_each_iommu(iommu, drhd) {
> if (drhd->ignored) {
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2 1/2] iommu/vt-d: Handle the failure case of dmar_reenable_qi()
2023-06-02 9:27 ` Robin Murphy
@ 2023-06-02 10:06 ` Yanfei Xu
0 siblings, 0 replies; 5+ messages in thread
From: Yanfei Xu @ 2023-06-02 10:06 UTC (permalink / raw)
To: Robin Murphy, dwmw2, baolu.lu, joro, will; +Cc: iommu, linux-kernel
On 6/2/2023 5:27 PM, Robin Murphy wrote:
> On 2023-06-02 03:05, Yanfei Xu wrote:
>> dmar_reenable_qi() may not succeed. Check and return when it fails.
>>
>> Signed-off-by: Yanfei Xu <yanfei.xu@intel.com>
>> ---
>> drivers/iommu/intel/iommu.c | 8 ++++++--
>> 1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
>> index 8096273b034c..e9188d045609 100644
>> --- a/drivers/iommu/intel/iommu.c
>> +++ b/drivers/iommu/intel/iommu.c
>> @@ -2967,10 +2967,14 @@ static int init_iommu_hw(void)
>> {
>> struct dmar_drhd_unit *drhd;
>> struct intel_iommu *iommu = NULL;
>> + int ret;
>> - for_each_active_iommu(iommu, drhd)
>> + for_each_active_iommu(iommu, drhd) {
>> if (iommu->qi)
>> - dmar_reenable_qi(iommu);
>> + ret = dmar_reenable_qi(iommu);
>> + if (ret)
>
> Nit: either this should be inside the previous condition, or you need
> to initialise ret to 0.
>
Oh, you are right. Will correct it.
Thanks,
Yanfei
> Thanks,
> Robin.
>
>> + return ret;
>> + }
>> for_each_iommu(iommu, drhd) {
>> if (drhd->ignored) {
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2023-06-02 10:07 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2023-06-02 2:05 [PATCH v2 0/2] Misc cleanup for iommu/vt-d Yanfei Xu
2023-06-02 2:05 ` [PATCH v2 1/2] iommu/vt-d: Handle the failure case of dmar_reenable_qi() Yanfei Xu
2023-06-02 9:27 ` Robin Murphy
2023-06-02 10:06 ` Yanfei Xu
2023-06-02 2:05 ` [PATCH v2 2/2] iommu/vt-d: Remove two WARN_ON in domain_context_mapping_one() Yanfei Xu
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