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534aa1dc97
An inclusion of cache.h in printk.h was added in 2014 in commitc28aa1f0a8("printk/cache: mark printk_once test variable __read_mostly") in order to bring in the definition of __read_mostly. The usage of __read_mostly was later removed in commit3ec25826ae("printk: Tie printk_once / printk_deferred_once into .data.once for reset") which made the inclusion of cache.h unnecessary, so remove it. We have a small amount of code that depended on the inclusion of cache.h from printk.h; fix that code to include the appropriate header. This fixes a circular inclusion on arm64 (linux/printk.h -> linux/cache.h -> asm/cache.h -> linux/kasan-enabled.h -> linux/static_key.h -> linux/jump_label.h -> linux/bug.h -> asm/bug.h -> linux/printk.h) that would otherwise be introduced by the next patch. Build tested using {allyesconfig,defconfig} x {arm64,x86_64}. Link: https://linux-review.googlesource.com/id/I8fd51f72c9ef1f2d6afd3b2cbc875aa4792c1fba Link: https://lkml.kernel.org/r/20220427195820.1716975-1-pcc@google.com Signed-off-by: Peter Collingbourne <pcc@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: David Rientjes <rientjes@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Kees Cook <keescook@chromium.org> Cc: Pekka Enberg <penberg@kernel.org> Cc: Roman Gushchin <roman.gushchin@linux.dev> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#define pr_fmt(fmt) "smccc: KVM: " fmt
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#include <linux/arm-smccc.h>
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#include <linux/bitmap.h>
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#include <linux/cache.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <asm/hypervisor.h>
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static DECLARE_BITMAP(__kvm_arm_hyp_services, ARM_SMCCC_KVM_NUM_FUNCS) __ro_after_init = { };
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void __init kvm_init_hyp_services(void)
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{
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struct arm_smccc_res res;
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u32 val[4];
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if (arm_smccc_1_1_get_conduit() != SMCCC_CONDUIT_HVC)
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return;
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arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID, &res);
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if (res.a0 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 ||
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res.a1 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 ||
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res.a2 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 ||
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res.a3 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3)
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return;
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memset(&res, 0, sizeof(res));
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arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID, &res);
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val[0] = lower_32_bits(res.a0);
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val[1] = lower_32_bits(res.a1);
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val[2] = lower_32_bits(res.a2);
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val[3] = lower_32_bits(res.a3);
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bitmap_from_arr32(__kvm_arm_hyp_services, val, ARM_SMCCC_KVM_NUM_FUNCS);
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pr_info("hypervisor services detected (0x%08lx 0x%08lx 0x%08lx 0x%08lx)\n",
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res.a3, res.a2, res.a1, res.a0);
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}
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bool kvm_arm_hyp_service_available(u32 func_id)
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{
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if (func_id >= ARM_SMCCC_KVM_NUM_FUNCS)
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return false;
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return test_bit(func_id, __kvm_arm_hyp_services);
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}
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EXPORT_SYMBOL_GPL(kvm_arm_hyp_service_available);
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