#include "hw/vfio/vfio-common.h"
#include "hw/hw.h"
+#include "exec/ram_addr.h"
#include "qemu/error-report.h"
#include "trace.h"
{
int ret;
IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
- unsigned pagesize = memory_region_iommu_get_min_page_size(iommu_mr);
+ uint64_t pagesize = memory_region_iommu_get_min_page_size(iommu_mr);
unsigned entries, pages;
struct vfio_iommu_spapr_tce_create create = { .argsz = sizeof(create) };
+ long systempagesize = qemu_getrampagesize();
+
+ /*
+ * The host might not support the guest supported IOMMU page size,
+ * so we will use smaller physical IOMMU pages to back them.
+ */
+ if (pagesize > systempagesize) {
+ pagesize = systempagesize;
+ }
+ pagesize = 1ULL << (63 - clz64(container->pgsizes &
+ (pagesize | (pagesize - 1))));
+ if (!pagesize) {
+ error_report("Host doesn't support page size 0x%"PRIx64
+ ", the supported mask is 0x%lx",
+ memory_region_iommu_get_min_page_size(iommu_mr),
+ container->pgsizes);
+ return -EINVAL;
+ }
/*
* FIXME: For VFIO iommu types which have KVM acceleration to
*/
entries = create.window_size >> create.page_shift;
pages = MAX((entries * sizeof(uint64_t)) / getpagesize(), 1);
- pages = MAX(pow2ceil(pages) - 1, 1); /* Round up */
+ pages = MAX(pow2ceil(pages), 1); /* Round up */
create.levels = ctz64(pages) / 6 + 1;
ret = ioctl(container->fd, VFIO_IOMMU_SPAPR_TCE_CREATE, &create);