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52 lines
1.2 KiB
52 lines
1.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/****************************************************************************** |
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* features.c |
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* |
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* Xen feature flags. |
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* |
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* Copyright (c) 2006, Ian Campbell, XenSource Inc. |
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*/ |
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#include <linux/types.h> |
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#include <linux/cache.h> |
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#include <linux/export.h> |
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#include <linux/printk.h> |
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#include <asm/xen/hypercall.h> |
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#include <xen/xen.h> |
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#include <xen/interface/xen.h> |
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#include <xen/interface/version.h> |
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#include <xen/features.h> |
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/* |
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* Linux kernel expects at least Xen 4.0. |
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* |
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* Assume some features to be available for that reason (depending on guest |
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* mode, of course). |
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*/ |
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#define chk_required_feature(f) { \ |
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if (!xen_feature(f)) \ |
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panic("Xen: feature %s not available!\n", #f); \ |
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} |
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u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly; |
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EXPORT_SYMBOL_GPL(xen_features); |
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void xen_setup_features(void) |
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{ |
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struct xen_feature_info fi; |
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int i, j; |
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for (i = 0; i < XENFEAT_NR_SUBMAPS; i++) { |
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fi.submap_idx = i; |
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if (HYPERVISOR_xen_version(XENVER_get_features, &fi) < 0) |
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break; |
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for (j = 0; j < 32; j++) |
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xen_features[i * 32 + j] = !!(fi.submap & 1<<j); |
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} |
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if (xen_pv_domain()) { |
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chk_required_feature(XENFEAT_mmu_pt_update_preserve_ad); |
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chk_required_feature(XENFEAT_gnttab_map_avail_bits); |
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} |
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}
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