From: Lu Baolu <baolu.lu@linux.intel.com>
To: John Garry <john.garry@huawei.com>,
joro@8bytes.org, will@kernel.org, dwmw2@infradead.org,
robin.murphy@arm.com, corbet@lwn.net
Cc: baolu.lu@linux.intel.com, linux-kernel@vger.kernel.org,
iommu@lists.linux-foundation.org, linuxarm@huawei.com,
thunder.leizhen@huawei.com, chenxiang66@hisilicon.com,
linux-doc@vger.kernel.org
Subject: Re: [PATCH v13 4/6] iommu/vt-d: Add support for IOMMU default DMA mode build options
Date: Thu, 17 Jun 2021 15:32:23 +0800 [thread overview]
Message-ID: <46dbce5c-1c2b-60d4-df56-d2b95a959425@linux.intel.com> (raw)
In-Reply-To: <1623841437-211832-5-git-send-email-john.garry@huawei.com>
On 6/16/21 7:03 PM, John Garry wrote:
> @@ -4382,9 +4380,9 @@ int __init intel_iommu_init(void)
> * is likely to be much lower than the overhead of synchronizing
> * the virtual and physical IOMMU page-tables.
> */
> - if (!intel_iommu_strict && cap_caching_mode(iommu->cap)) {
> - pr_warn("IOMMU batching is disabled due to virtualization");
> - intel_iommu_strict = 1;
> + if (cap_caching_mode(iommu->cap)) {
> + pr_warn("IOMMU batching disallowed due to virtualization\n");
> + iommu_set_dma_strict(true);
With this change, VM guest will always show this warning. How about
removing this message? Users could get the same information through the
kernel message added by "[PATCH v13 2/6] iommu: Print strict or lazy
mode at init time".
Best regards,
baolu
next prev parent reply other threads:[~2021-06-17 7:33 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-16 11:03 [PATCH v13 0/6] iommu: Enhance IOMMU default DMA mode build options John Garry
2021-06-16 11:03 ` [PATCH v13 1/6] iommu: Deprecate Intel and AMD cmdline methods to enable strict mode John Garry
2021-06-17 19:01 ` Robin Murphy
2021-06-18 7:43 ` John Garry
2021-06-16 11:03 ` [PATCH v13 2/6] iommu: Print strict or lazy mode at init time John Garry
2021-06-16 11:03 ` [PATCH v13 3/6] iommu: Enhance IOMMU default DMA mode build options John Garry
2021-06-16 11:03 ` [PATCH v13 4/6] iommu/vt-d: Add support for " John Garry
2021-06-17 7:32 ` Lu Baolu [this message]
2021-06-17 8:00 ` John Garry
2021-06-17 19:03 ` Robin Murphy
2021-06-18 1:46 ` Lu Baolu
2021-06-18 7:31 ` John Garry
2021-06-16 11:03 ` [PATCH v13 5/6] iommu/amd: " John Garry
2021-06-16 11:03 ` [PATCH v13 6/6] iommu: Remove mode argument from iommu_set_dma_strict() John Garry
2021-06-17 7:36 ` Lu Baolu
2021-06-17 7:41 ` John Garry
2021-06-18 1:52 ` Lu Baolu
2021-06-17 18:56 ` Robin Murphy
2021-06-18 1:51 ` Lu Baolu
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