From: Guenter Roeck <linux@roeck-us.net>
To: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
iommu@lists.linux-foundation.org, Joerg Roedel <joro@8bytes.org>,
Lu Baolu <baolu.lu@linux.intel.com>,
David Woodhouse <dwmw2@infradead.org>,
"Tian, Kevin" <kevin.tian@intel.com>,
Raj Ashok <ashok.raj@intel.com>,
Sanjay Kumar <sanjay.k.kumar@intel.com>,
Jean-Philippe Brucker <jean-philippe@linaro.com>
Subject: Re: [PATCH v2 1/4] iommu/vt-d: Enable write protect for supervisor SVM
Date: Mon, 22 Mar 2021 10:53:38 -0700 [thread overview]
Message-ID: <20210322175338.GA24424@roeck-us.net> (raw)
In-Reply-To: <1614680040-1989-2-git-send-email-jacob.jun.pan@linux.intel.com>
On Tue, Mar 02, 2021 at 02:13:57AM -0800, Jacob Pan wrote:
> Write protect bit, when set, inhibits supervisor writes to the read-only
> pages. In supervisor shared virtual addressing (SVA), where page tables
> are shared between CPU and DMA, IOMMU PASID entry WPE bit should match
> CR0.WP bit in the CPU.
> This patch sets WPE bit for supervisor PASIDs if CR0.WP is set.
>
> Signed-off-by: Sanjay Kumar <sanjay.k.kumar@intel.com>
> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
> ---
ia64:defconfig:
drivers/iommu/intel/pasid.c: In function 'pasid_enable_wpe':
drivers/iommu/intel/pasid.c:536:22: error: implicit declaration of function 'read_cr0'
drivers/iommu/intel/pasid.c:539:23: error: 'X86_CR0_WP' undeclared
Maybe it _is_ time to retire ia64 ?
Guenter
next prev parent reply other threads:[~2021-03-22 17:54 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-02 10:13 [PATCH v2 0/4] Misc vSVA fixes for VT-d Jacob Pan
2021-03-02 10:13 ` [PATCH v2 1/4] iommu/vt-d: Enable write protect for supervisor SVM Jacob Pan
2021-03-03 4:56 ` Lu Baolu
2021-03-22 17:53 ` Guenter Roeck [this message]
2021-03-30 17:52 ` Jacob Pan
2021-03-30 19:02 ` Guenter Roeck
2021-03-02 10:13 ` [PATCH v2 2/4] iommu/vt-d: Enable write protect propagation from guest Jacob Pan
2021-03-03 4:57 ` Lu Baolu
2021-03-02 10:13 ` [PATCH v2 3/4] iommu/vt-d: Reject unsupported page request modes Jacob Pan
2021-03-02 10:14 ` [PATCH v2 4/4] iommu/vt-d: Calculate and set flags for handle_mm_fault Jacob Pan
2021-03-18 10:43 ` [PATCH v2 0/4] Misc vSVA fixes for VT-d Joerg Roedel
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