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hw/arm/virt-acpi-build: Fix id_count in build_iort_id_mapping 

It's observed that Linux kernel booting with the VM reports a "conflicting
mapping for input ID" FW_BUG.

The IORT doc defines "Number of IDs" to be "the number of IDs in the range
minus one", while virt-acpi-build.c simply stores the number of IDs in the
id_count without the "minus one". Meanwhile, some of the callers pass in a
0xFFFF following the spec. So, this is a mismatch between the function and
its callers.

Fix build_iort_id_mapping() by internally subtracting one from the pass-in
@id_count. Accordingly make sure that all existing callers pass in a value
without the "minus one", i.e. change all 0xFFFFs to 0x10000s.

Also, add a few lines of comments to highlight this change along with the
referencing document for this build_iort_id_mapping().

Fixes: 42e0f050e3 ("hw/arm/virt-acpi-build: Add IORT support to bypass SMMUv3")
Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Message-Id: <20240619201243.936819-1-nicolinc@nvidia.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Nicolin Chen 2024-06-19 13:12:43 -07:00 committed by Michael S. Tsirkin
parent 93c76555d8
commit 5786827f47
1 changed files with 13 additions and 6 deletions
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19
hw/arm/virt-acpi-build.c
View File

@ -209,12 +209,19 @@ static void acpi_dsdt_add_tpm(Aml *scope, VirtMachineState *vms)
#define ROOT_COMPLEX_ENTRY_SIZE 36
#define IORT_NODE_OFFSET 48
/*
* Append an ID mapping entry as described by "Table 4 ID mapping format" in
* "IO Remapping Table System Software on ARM Platforms", Chapter 3.
* Document number: ARM DEN 0049E.f, Apr 2024
*
* Note that @id_count gets internally subtracted by one, following the spec.
*/
static void build_iort_id_mapping(GArray *table_data, uint32_t input_base,
uint32_t id_count, uint32_t out_ref)
{
/* Table 4 ID mapping format */
build_append_int_noprefix(table_data, input_base, 4); /* Input base */
build_append_int_noprefix(table_data, id_count, 4); /* Number of IDs */
/* Number of IDs - The number of IDs in the range minus one */
build_append_int_noprefix(table_data, id_count - 1, 4);
build_append_int_noprefix(table_data, input_base, 4); /* Output base */
build_append_int_noprefix(table_data, out_ref, 4); /* Output Reference */
/* Flags */
@ -305,8 +312,8 @@ build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
}
/* Append the last RC -> ITS ID mapping */
if (next_range.input_base < 0xFFFF) {
next_range.id_count = 0xFFFF - next_range.input_base;
if (next_range.input_base < 0x10000) {
next_range.id_count = 0x10000 - next_range.input_base;
g_array_append_val(its_idmaps, next_range);
}
@ -365,7 +372,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
build_append_int_noprefix(table_data, 0, 4);
/* output IORT node is the ITS group node (the first node) */
build_iort_id_mapping(table_data, 0, 0xFFFF, IORT_NODE_OFFSET);
build_iort_id_mapping(table_data, 0, 0x10000, IORT_NODE_OFFSET);
}
/* Table 17 Root Complex Node */
@ -418,7 +425,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
}
} else {
/* output IORT node is the ITS group node (the first node) */
build_iort_id_mapping(table_data, 0, 0xFFFF, IORT_NODE_OFFSET);
build_iort_id_mapping(table_data, 0, 0x10000, IORT_NODE_OFFSET);
}
acpi_table_end(linker, &table);