Re: [PATCH 1/1] iommu/vt-d: Serialize IOMMU GCMD register modifications

Hi Kevin, On 8/26/20 1:29 PM, Tian, Kevin wrote: From: Lu Baolu Sent: Wednesday, August 26, 2020 10:58 AM The VT-d spec requires (10.4.4 Global Command Register, GCMD_REG General Description) that: If multiple control fields in this register need to be modified, software must serialize the mod

RE: [PATCH 1/1] iommu/vt-d: Serialize IOMMU GCMD register modifications

> From: Lu Baolu > Sent: Wednesday, August 26, 2020 10:58 AM > > The VT-d spec requires (10.4.4 Global Command Register, GCMD_REG > General > Description) that: > > If multiple control fields in this register need to be modified, software > must serialize the modifications through multiple writes

[PATCH 1/1] iommu/vt-d: Serialize IOMMU GCMD register modifications

The VT-d spec requires (10.4.4 Global Command Register, GCMD_REG General Description) that: If multiple control fields in this register need to be modified, software must serialize the modifications through multiple writes to this register. However, in irq_remapping.c, modifications of IRE and CF