On Wed, 18 Dec 2019 11:25:27 +0800 Lu Baolu <baolu...@linux.intel.com> wrote:
> Hi, > > On 12/17/19 3:24 AM, Jacob Pan wrote: > > Virtual command registers are used in the guest only, to prevent > > vmexit cost, we cache the capability and store it during > > initialization. > > > > Signed-off-by: Jacob Pan <jacob.jun....@linux.intel.com> > > --- > > drivers/iommu/dmar.c | 1 + > > include/linux/intel-iommu.h | 4 ++++ > > 2 files changed, 5 insertions(+) > > > > diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c > > index f2f5d75da94a..3f98dd9ad004 100644 > > --- a/drivers/iommu/dmar.c > > +++ b/drivers/iommu/dmar.c > > @@ -953,6 +953,7 @@ static int map_iommu(struct intel_iommu *iommu, > > u64 phys_addr) warn_invalid_dmar(phys_addr, " returns all ones"); > > goto unmap; > > } > > + iommu->vccap = dmar_readq(iommu->reg + DMAR_VCCAP_REG); > > > > /* the registers might be more than one page */ > > map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap), > > diff --git a/include/linux/intel-iommu.h > > b/include/linux/intel-iommu.h index ee26989df008..4d25141ec3df > > 100644 --- a/include/linux/intel-iommu.h > > +++ b/include/linux/intel-iommu.h > > @@ -189,6 +189,9 @@ > > #define ecap_max_handle_mask(e) ((e >> 20) & 0xf) > > #define ecap_sc_support(e) ((e >> 7) & 0x1) /* Snooping > > Control */ > > +/* Virtual command interface capabilities */ > > +#define vccap_pasid(v) ((v & DMA_VCS_PAS)) /* PASID > > allocation */ > > Has DMA_VCS_PAS ever been defined? > Good catch, it is in the next patch, need to move the #define here. Thanks! > Best regards, > baolu > > [...] [Jacob Pan] _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
