From: Ben Widawsky <[email protected]> According to PCIe spec 5.0 Type 1 header space Base Address Registers are defined by 7.5.1.2.1 Base Address Registers (same as Type 0). The _CRS region should allow for the same range (up to 64b). Prior to this change, any host bridge utilizing more than 32b for the BAR would have the address truncated and likely lead to conflicts when the operating systems reads the _CRS object.
Signed-off-by: Ben Widawsky <[email protected]> Message-Id: <[email protected]> Reviewed-by: Michael S. Tsirkin <[email protected]> Signed-off-by: Michael S. Tsirkin <[email protected]> Reviewed-by: Igor Mammedov <[email protected]> --- hw/i386/acpi-build.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c index 98ff9f5cef..4f66642d88 100644 --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -786,8 +786,14 @@ static Aml *build_crs(PCIHostState *host, CrsRangeSet *range_set) crs_range_insert(temp_range_set.io_ranges, range_base, range_limit); } else { /* "memory" */ - crs_range_insert(temp_range_set.mem_ranges, - range_base, range_limit); + uint64_t length = range_limit - range_base + 1; + if (range_limit <= UINT32_MAX && length <= UINT32_MAX) { + crs_range_insert(temp_range_set.mem_ranges, range_base, + range_limit); + } else { + crs_range_insert(temp_range_set.mem_64bit_ranges, + range_base, range_limit); + } } } -- MST
