linux-kernel - Re: [PATCH v11 06/10] iommu/vt-d: datatypes and functions used for kdump

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Date:	Wed, 13 May 2015 17:10:59 +0800
From:	Baoquan He <bhe@...hat.com>
To:	"Li, ZhenHua" <zhen-hual@...com>
Cc:	dwmw2@...radead.org, indou.takao@...fujitsu.com, joro@...tes.org,
	vgoyal@...hat.com, dyoung@...hat.com,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, kexec@...ts.infradead.org,
	alex.williamson@...hat.com, ddutile@...hat.com,
	ishii.hironobu@...fujitsu.com, bhelgaas@...gle.com,
	doug.hatch@...com, jerry.hoemann@...com, tom.vaden@...com,
	li.zhang6@...com, lisa.mitchell@...com, billsumnerlinux@...il.com,
	rwright@...com
Subject: Re: [PATCH v11 06/10] iommu/vt-d: datatypes and functions used for
 kdump

On 05/13/15 at 04:58pm, Li, ZhenHua wrote:
> Hi Dave,
> 
> iommu->root_entry_old_virt is used to store the mapped old rta.
> iommu->root_entry_old_phys is used to store the physical address
> stored in registers.
> So we must not free/unmap iommu->root_entry_old_phys .

Oh, yes. I was mistaken on this. Thanks for telling.

> 
> Zhenhua
> On 05/13/2015 04:56 PM, Baoquan He wrote:
> >>+
> >>+	iommu->root_entry_old_phys = q & VTD_PAGE_MASK;
> >>+	if (!iommu->root_entry_old_phys) {
> >>+		pr_err("Could not read old root entry address.");
> >>+		return -1;
> >>+	}
> >>+
> >
> >I didn't find where you call iounmap to free mapping of
> >iommu->root_entry_old_phys. Am I missing anything?
> >
> >>+	iommu->root_entry_old_virt = ioremap_cache(iommu->root_entry_old_phys,
> >>+						VTD_PAGE_SIZE);
> >>+	if (!iommu->root_entry_old_virt) {
> >>+		pr_err("Could not map the old root entry.");
> >>+		return -ENOMEM;
> >>+	}
> 
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