Commit bb6ee10a authored by Zenghui Yu's avatar Zenghui Yu Committed by Zheng Zengkai
Browse files

KVM: arm64: Probe Hisi CPU TYPE from ACPI/DTB 

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4IZOS


CVE: NA

----------------------------------------------------

Parse ACPI/DTB to get where the hypervisor is running.

Signed-off-by: default avatarZenghui Yu <yuzenghui@huawei.com>
Signed-off-by: default avatarYanan Wang <wangyanan55@huawei.com>
Reviewed-by: default avatarZenghui Yu <yuzenghui@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent ab560605

arch/arm64/include/asm/hisi_cpu_model.h

0 → 100644
+19 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * Copyright(c) 2019 Huawei Technologies Co., Ltd

 */



#ifndef __HISI_CPU_MODEL_H__

#define __HISI_CPU_MODEL_H__



enum hisi_cpu_type {

	HI_1612,

	HI_1616,

	HI_1620,

	UNKNOWN_HI_TYPE

};



extern enum hisi_cpu_type hi_cpu_type;



void probe_hisi_cpu_type(void);

#endif /* __HISI_CPU_MODEL_H__ */

arch/arm64/include/asm/kvm_host.h

+1 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#include <asm/kvm.h>

#include <asm/kvm_asm.h>

#include <asm/thread_info.h>

#include <asm/hisi_cpu_model.h>



#define __KVM_HAVE_ARCH_INTC_INITIALIZED

arch/arm64/kvm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ kvm-y := $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o \ 
	 guest.o debug.o reset.o sys_regs.o \

	 vgic-sys-reg-v3.o fpsimd.o pmu.o \

	 aarch32.o arch_timer.o \

	 hisi_cpu_model.o \

	 vgic/vgic.o vgic/vgic-init.o \

	 vgic/vgic-irqfd.o vgic/vgic-v2.o \

	 vgic/vgic-v3.o vgic/vgic-v4.o \

arch/arm64/kvm/arm.c

+6 −0
Original line number Diff line number Diff line
@@ -58,6 +58,9 @@ static DEFINE_SPINLOCK(kvm_vmid_lock); 


static bool vgic_present;



/* Hisi cpu type enum */

enum hisi_cpu_type hi_cpu_type = UNKNOWN_HI_TYPE;



static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);

DEFINE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
@@ -1833,6 +1836,9 @@ int kvm_arch_init(void *opaque) 
		return -ENODEV;

	}



	/* Probe the Hisi CPU type */

	probe_hisi_cpu_type();



	in_hyp_mode = is_kernel_in_hyp_mode();



	if (!in_hyp_mode && kvm_arch_requires_vhe()) {

arch/arm64/kvm/hisi_cpu_model.c

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+83 −0
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// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * Copyright(c) 2019 Huawei Technologies Co., Ltd

 */



#include <linux/acpi.h>

#include <linux/of.h>

#include <linux/init.h>

#include <linux/kvm_host.h>



#ifdef CONFIG_ACPI



/* ACPI Hisi oem table id str */

const char *oem_str[] = {

	"HIP06",	/* Hisi 1612 */

	"HIP07",	/* Hisi 1616 */

	"HIP08"		/* Hisi 1620 */

};



/*

 * Get Hisi oem table id.

 */

static void acpi_get_hw_cpu_type(void)

{

	struct acpi_table_header *table;

	acpi_status status;

	int i, str_size = ARRAY_SIZE(oem_str);



	/* Get oem table id from ACPI table header */

	status = acpi_get_table(ACPI_SIG_DSDT, 0, &table);

	if (ACPI_FAILURE(status)) {

		pr_err("Failed to get ACPI table: %s\n",

		       acpi_format_exception(status));

		return;

	}



	for (i = 0; i < str_size; ++i) {

		if (!strncmp(oem_str[i], table->oem_table_id, 5)) {

			hi_cpu_type = i;

			return;

		}

	}

}



#else

static void acpi_get_hw_cpu_type(void) {}

#endif



/* of Hisi cpu model str */

const char *of_model_str[] = {

	"Hi1612",

	"Hi1616"

};



static void of_get_hw_cpu_type(void)

{

	const char *cpu_type;

	int ret, i, str_size = ARRAY_SIZE(of_model_str);



	ret = of_property_read_string(of_root, "model", &cpu_type);

	if (ret < 0) {

		pr_err("Failed to get Hisi cpu model by OF.\n");

		return;

	}



	for (i = 0; i < str_size; ++i) {

		if (strstr(cpu_type, of_model_str[i])) {

			hi_cpu_type = i;

			return;

		}

	}

}



void probe_hisi_cpu_type(void)

{

	if (!acpi_disabled)

		acpi_get_hw_cpu_type();

	else

		of_get_hw_cpu_type();



	if (hi_cpu_type == UNKNOWN_HI_TYPE)

		pr_warn("UNKNOWN Hisi cpu type.\n");

}