From 37aab238363c8242aa76853396c4f272b5508bca Mon Sep 17 00:00:00 2001 From: Salil Mehta Date: Mon, 8 Jun 2020 15:25:35 +0100 Subject: [PATCH] arm/acpi: Enable ACPI support for vcpu hotplug ACPI is required to interface QEMU with the guest. Roughly falls into below cases, 1. Convey the possible vcpus config at the machine init time to the guest using various DSDT tables like MADT etc. 2. Convey vcpu hotplug events to guest(using GED) 3. Assist in evaluation of various ACPI methods(like _EVT, _STA, _OST, _EJ0, _MAT etc.) 4. Provides ACPI cpu hotplug state and 12 Byte memory mapped cpu hotplug control register interface to the OSPM/guest corresponding to each possible vcpu. The register interface consists of various R/W fields and their handling operations. These are called when ever register fields or memory regions are accessed(i.e. read or written) by OSPM when ever it evaluates various ACPI methods. Note: lot of this framework code is inherited from the changes already done for x86 but still some minor changes are required to make it compatible with ARM64.) This patch enables the ACPI support for virtual cpu hotplug. ACPI changes required will follow in subsequent patches. Co-developed-by: Salil Mehta Signed-off-by: Salil Mehta Co-developed-by: Keqian Zhu Signed-off-by: Keqian Zhu Signed-off-by: Salil Mehta --- hw/arm/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig index 3ada335a24..c0a7d0bd58 100644 --- a/hw/arm/Kconfig +++ b/hw/arm/Kconfig @@ -29,6 +29,7 @@ config ARM_VIRT select ACPI_HW_REDUCED select ACPI_APEI select ACPI_VIOT + select ACPI_CPU_HOTPLUG select VIRTIO_MEM_SUPPORTED select ACPI_CXL select ACPI_HMAT -- 2.27.0