Re: [Qemu-devel] [PATCH] fw_cfg: don't use DMA mapping for fw_cfg device

On Mon, Jan 15, 2018 at 12:22:48PM +0100, Marc-Andre Lureau wrote: > Hi > > On Mon, Jan 15, 2018 at 9:55 AM, Peter Xu wrote: > > fw_cfg device does not need IOMMU protection, so use physical addresses > > always. That's how QEMU implements fw_cfg. Otherwise we'll see call > > traces during boot

Re: [Qemu-devel] [PATCH] fw_cfg: don't use DMA mapping for fw_cfg device

Hi On Mon, Jan 15, 2018 at 9:55 AM, Peter Xu wrote: > fw_cfg device does not need IOMMU protection, so use physical addresses > always. That's how QEMU implements fw_cfg. Otherwise we'll see call > traces during boot when vIOMMU is enabled in guest: > > [1.018306] [ cut here ]--

[Qemu-devel] [PATCH] fw_cfg: don't use DMA mapping for fw_cfg device

fw_cfg device does not need IOMMU protection, so use physical addresses always. That's how QEMU implements fw_cfg. Otherwise we'll see call traces during boot when vIOMMU is enabled in guest: [1.018306] [ cut here ] [1.018314] WARNING: CPU: 1 PID: 1 at drivers/fir