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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Jun 2025 17:51:24.6125 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 369f911f-cf31-4ca9-d5e8-08dda9109558 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH3PEPF00000016.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB8019 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1749664305121116600 Content-Type: text/plain; charset="utf-8" When a device is passed through to a xl domU, the iomem ranges may overlap with the extended regions. Remove iomem from extended regions. Signed-off-by: Stewart Hildebrand Reviewed-by: Anthony PERARD --- Not sure if we need a Fixes: tag, but if we do: Fixes: 57f87857dc2d ("libxl/arm: Add handling of extended regions for DomU") v4->v5: * add Anthony's R-b v3->v4: * use "else" instead of continue + another if statement * remove assert * s/iomem.end >=3D/unallocated.start >/ in two conditions * new variable to distinguish unallocated size from region size * print base + size - 1 v2->v3: * no change v1->v2: * no change --- tools/libs/light/libxl_arm.c | 110 +++++++++++++++++++++++++++++------ 1 file changed, 91 insertions(+), 19 deletions(-) diff --git a/tools/libs/light/libxl_arm.c b/tools/libs/light/libxl_arm.c index 75c811053c7c..3086c52acf83 100644 --- a/tools/libs/light/libxl_arm.c +++ b/tools/libs/light/libxl_arm.c @@ -798,6 +798,8 @@ static int make_timer_node(libxl__gc *gc, void *fdt, return 0; } =20 +#define MAX_NR_EXT_REGIONS 256 + static int make_hypervisor_node(libxl__gc *gc, void *fdt, const libxl_version_info *vers) { @@ -821,7 +823,7 @@ static int make_hypervisor_node(libxl__gc *gc, void *fd= t, */ res =3D fdt_property_reg_placeholder(gc, fdt, GUEST_ROOT_ADDRESS_CELLS, GUEST_ROOT_SIZE_CELLS, - GUEST_RAM_BANKS + 1); + MAX_NR_EXT_REGIONS + 1); if (res) return res; =20 /* @@ -1517,17 +1519,29 @@ static void finalise_one_node(libxl__gc *gc, void *= fdt, const char *uname, =20 #define EXT_REGION_MIN_SIZE xen_mk_ullong(0x0004000000) /* 64MB */ =20 -static int finalize_hypervisor_node(libxl__gc *gc, struct xc_dom_image *do= m) +static int compare_iomem(const void *a, const void *b) +{ + const libxl_iomem_range *x =3D a, *y =3D b; + + if (x->gfn < y->gfn) + return -1; + if (x->gfn > y->gfn) + return 1; + return 0; +} + +static int finalize_hypervisor_node(libxl__gc *gc, + libxl_domain_build_info *b_info, + struct xc_dom_image *dom) { void *fdt =3D dom->devicetree_blob; - uint64_t region_size[GUEST_RAM_BANKS] =3D {0}, region_base[GUEST_RAM_B= ANKS], - bankend[GUEST_RAM_BANKS]; + uint64_t region_base[MAX_NR_EXT_REGIONS], region_size[MAX_NR_EXT_REGIO= NS]; uint32_t regs[(GUEST_ROOT_ADDRESS_CELLS + GUEST_ROOT_SIZE_CELLS) * - (GUEST_RAM_BANKS + 1)]; + (MAX_NR_EXT_REGIONS + 1)]; be32 *cells =3D ®s[0]; const uint64_t bankbase[] =3D GUEST_RAM_BANK_BASES; const uint64_t banksize[] =3D GUEST_RAM_BANK_SIZES; - unsigned int i, len, nr_regions =3D 0; + unsigned int i, j, len, nr_regions =3D 0; libxl_dominfo info; int offset, rc; =20 @@ -1542,20 +1556,82 @@ static int finalize_hypervisor_node(libxl__gc *gc, = struct xc_dom_image *dom) if (info.gpaddr_bits > 64) return ERROR_INVAL; =20 + qsort(b_info->iomem, b_info->num_iomem, sizeof(libxl_iomem_range), + compare_iomem); + /* * Try to allocate separate 2MB-aligned extended regions from the first * and second RAM banks taking into the account the maximum supported * guest physical address space size and the amount of memory assigned * to the guest. */ - for (i =3D 0; i < GUEST_RAM_BANKS; i++) { - region_base[i] =3D bankbase[i] + + for (i =3D 0; i < GUEST_RAM_BANKS && nr_regions < MAX_NR_EXT_REGIONS; = i++) { + struct { + uint64_t start; + uint64_t end; /* inclusive */ + } unallocated; + uint64_t unallocated_size =3D 0; + + unallocated.start =3D bankbase[i] + ALIGN_UP_TO_2MB((uint64_t)dom->rambank_size[i] << XC_PAGE_SHIF= T); =20 - bankend[i] =3D ~0ULL >> (64 - info.gpaddr_bits); - bankend[i] =3D min(bankend[i], bankbase[i] + banksize[i] - 1); - if (bankend[i] > region_base[i]) - region_size[i] =3D bankend[i] - region_base[i] + 1; + unallocated.end =3D ~0ULL >> (64 - info.gpaddr_bits); + unallocated.end =3D min(unallocated.end, bankbase[i] + banksize[i]= - 1); + + if (unallocated.end >=3D unallocated.start) + unallocated_size =3D unallocated.end - unallocated.start + 1; + + if (unallocated_size < EXT_REGION_MIN_SIZE) + continue; + + /* Exclude iomem */ + for (j =3D 0; j < b_info->num_iomem && nr_regions < MAX_NR_EXT_REG= IONS; + j++) { + struct { + uint64_t start; + uint64_t end; /* inclusive */ + } iomem; + + iomem.start =3D b_info->iomem[j].gfn << XC_PAGE_SHIFT; + iomem.end =3D ((b_info->iomem[j].gfn + b_info->iomem[j].number) + << XC_PAGE_SHIFT) - 1; + + if (iomem.end >=3D unallocated.start + && iomem.start <=3D unallocated.end) { + + if (iomem.start <=3D unallocated.start) { + unallocated.start =3D iomem.end + 1; + + if (unallocated.start > unallocated.end) + break; + } else { + uint64_t size =3D iomem.start - unallocated.start; + + if (size >=3D EXT_REGION_MIN_SIZE) { + region_base[nr_regions] =3D unallocated.start; + region_size[nr_regions] =3D size; + nr_regions++; + } + + unallocated.start =3D iomem.end + 1; + + if (unallocated.start > unallocated.end) + break; + } + } + } + + if (unallocated.end >=3D unallocated.start + && nr_regions < MAX_NR_EXT_REGIONS) + { + uint64_t size =3D unallocated.end - unallocated.start + 1; + + if (size >=3D EXT_REGION_MIN_SIZE) { + region_base[nr_regions] =3D unallocated.start; + region_size[nr_regions] =3D size; + nr_regions++; + } + } } =20 /* @@ -1565,16 +1641,12 @@ static int finalize_hypervisor_node(libxl__gc *gc, = struct xc_dom_image *dom) set_range(&cells, GUEST_ROOT_ADDRESS_CELLS, GUEST_ROOT_SIZE_CELLS, GUEST_GNTTAB_BASE, GUEST_GNTTAB_SIZE); =20 - for (i =3D 0; i < GUEST_RAM_BANKS; i++) { - if (region_size[i] < EXT_REGION_MIN_SIZE) - continue; - + for (i =3D 0; i < nr_regions; i++) { LOG(DEBUG, "Extended region %u: %#"PRIx64"->%#"PRIx64"", - nr_regions, region_base[i], region_base[i] + region_size[i]); + i, region_base[i], region_base[i] + region_size[i] - 1); =20 set_range(&cells, GUEST_ROOT_ADDRESS_CELLS, GUEST_ROOT_SIZE_CELLS, region_base[i], region_size[i]); - nr_regions++; } =20 if (!nr_regions) @@ -1626,7 +1698,7 @@ int libxl__arch_domain_finalise_hw_description(libxl_= _gc *gc, =20 } =20 - res =3D finalize_hypervisor_node(gc, dom); + res =3D finalize_hypervisor_node(gc, &d_config->b_info, dom); if (res) return res; =20 --=20 2.49.0