From 451b157041d265f94a4be668b9cd234b3e34fabb Mon Sep 17 00:00:00 2001 From: Yubo Miao Date: Thu, 19 Nov 2020 09:48:38 +0800 Subject: [PATCH] acpi: Align the size to 128k If table size is changed between virt_acpi_build and virt_acpi_build_update, the table size would not be updated to UEFI, therefore, just align the size to 128kb, which is enough and same with x86. It would warn if 64k is not enough and the align size should be updated. Signed-off-by: Yubo Miao Signed-off-by: Jiahui Cen Message-Id: <20201119014841.7298-7-cenjiahui@huawei.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/arm/virt-acpi-build.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c index e0bed9037c..711cf2069f 100644 --- a/hw/arm/virt-acpi-build.c +++ b/hw/arm/virt-acpi-build.c @@ -57,6 +57,8 @@ #define ARM_SPI_BASE 32 +#define ACPI_BUILD_TABLE_SIZE 0x20000 + static void acpi_dsdt_add_cpus(Aml *scope, int smp_cpus) { uint16_t i; @@ -656,6 +658,15 @@ struct AcpiBuildState { bool patched; } AcpiBuildState; +static void acpi_align_size(GArray *blob, unsigned align) +{ + /* + * Align size to multiple of given size. This reduces the chance + * we need to change size in the future (breaking cross version migration). + */ + g_array_set_size(blob, ROUND_UP(acpi_data_len(blob), align)); +} + static void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables) { @@ -743,6 +754,20 @@ void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables) build_rsdp(tables->rsdp, tables->linker, &rsdp_data); } + /* + * The align size is 128, warn if 64k is not enough therefore + * the align size could be resized. + */ + if (tables_blob->len > ACPI_BUILD_TABLE_SIZE / 2) { + warn_report("ACPI table size %u exceeds %d bytes," + " migration may not work", + tables_blob->len, ACPI_BUILD_TABLE_SIZE / 2); + error_printf("Try removing CPUs, NUMA nodes, memory slots" + " or PCI bridges."); + } + acpi_align_size(tables_blob, ACPI_BUILD_TABLE_SIZE); + + /* Cleanup memory that's no longer used. */ g_array_free(table_offsets, true); } -- 2.11.4.GIT