Re: [PATCH 1/4] iommu/vt-d: Enable write protect for supervisor SVM

Hi Jacob, I love your patch! Yet something to improve: [auto build test ERROR on iommu/next] [also build test ERROR on linux/master linus/master v5.12-rc1 next-20210303] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' a

Re: [PATCH 1/4] iommu/vt-d: Enable write protect for supervisor SVM

Hi Lu, On Sat, 20 Feb 2021 09:56:26 +0800, Lu Baolu wrote: > Hi Jacob and Sanjay, > > On 2/19/21 5:31 AM, 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 betw

Re: [PATCH 1/4] iommu/vt-d: Enable write protect for supervisor SVM

Hi Jacob and Sanjay, On 2/19/21 5:31 AM, 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.