53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Common Ultravisor functions and initialization
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*
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* Copyright IBM Corp. 2019, 2020
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*/
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#define KMSG_COMPONENT "prot_virt"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/sizes.h>
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#include <linux/bitmap.h>
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#include <linux/memblock.h>
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#include <asm/facility.h>
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#include <asm/sections.h>
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#include <asm/uv.h>
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/* the bootdata_preserved fields come from ones in arch/s390/boot/uv.c */
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#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
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int __bootdata_preserved(prot_virt_guest);
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#endif
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#if IS_ENABLED(CONFIG_KVM)
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int prot_virt_host;
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EXPORT_SYMBOL(prot_virt_host);
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struct uv_info __bootdata_preserved(uv_info);
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EXPORT_SYMBOL(uv_info);
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static int __init prot_virt_setup(char *val)
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{
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bool enabled;
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int rc;
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rc = kstrtobool(val, &enabled);
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if (!rc && enabled)
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prot_virt_host = 1;
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if (is_prot_virt_guest() && prot_virt_host) {
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prot_virt_host = 0;
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pr_warn("Protected virtualization not available in protected guests.");
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}
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if (prot_virt_host && !test_facility(158)) {
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prot_virt_host = 0;
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pr_warn("Protected virtualization not supported by the hardware.");
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}
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return rc;
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}
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early_param("prot_virt", prot_virt_setup);
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#endif
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