cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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kvm_guest.c (1411B)

      1// SPDX-License-Identifier: GPL-2.0
      2
      3#define pr_fmt(fmt) "smccc: KVM: " fmt
      4
      5#include <linux/arm-smccc.h>
      6#include <linux/bitmap.h>
      7#include <linux/cache.h>
      8#include <linux/kernel.h>
      9#include <linux/string.h>
     10
     11#include <asm/hypervisor.h>
     12
     13static DECLARE_BITMAP(__kvm_arm_hyp_services, ARM_SMCCC_KVM_NUM_FUNCS) __ro_after_init = { };
     14
     15void __init kvm_init_hyp_services(void)
     16{
     17	struct arm_smccc_res res;
     18	u32 val[4];
     19
     20	if (arm_smccc_1_1_get_conduit() != SMCCC_CONDUIT_HVC)
     21		return;
     22
     23	arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID, &res);
     24	if (res.a0 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 ||
     25	    res.a1 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 ||
     26	    res.a2 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 ||
     27	    res.a3 != ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3)
     28		return;
     29
     30	memset(&res, 0, sizeof(res));
     31	arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID, &res);
     32
     33	val[0] = lower_32_bits(res.a0);
     34	val[1] = lower_32_bits(res.a1);
     35	val[2] = lower_32_bits(res.a2);
     36	val[3] = lower_32_bits(res.a3);
     37
     38	bitmap_from_arr32(__kvm_arm_hyp_services, val, ARM_SMCCC_KVM_NUM_FUNCS);
     39
     40	pr_info("hypervisor services detected (0x%08lx 0x%08lx 0x%08lx 0x%08lx)\n",
     41		 res.a3, res.a2, res.a1, res.a0);
     42}
     43
     44bool kvm_arm_hyp_service_available(u32 func_id)
     45{
     46	if (func_id >= ARM_SMCCC_KVM_NUM_FUNCS)
     47		return false;
     48
     49	return test_bit(func_id, __kvm_arm_hyp_services);
     50}
     51EXPORT_SYMBOL_GPL(kvm_arm_hyp_service_available);