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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hv-common.c (1055B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <asm/io.h>
      3#include <asm/hvcall.h>
      4
      5#include "hv-gpci.h"
      6#include "hv-common.h"
      7
      8unsigned long hv_perf_caps_get(struct hv_perf_caps *caps)
      9{
     10	unsigned long r;
     11	struct p {
     12		struct hv_get_perf_counter_info_params params;
     13		struct hv_gpci_system_performance_capabilities caps;
     14	} __packed __aligned(sizeof(uint64_t));
     15
     16	struct p arg = {
     17		.params = {
     18			.counter_request = cpu_to_be32(
     19				HV_GPCI_system_performance_capabilities),
     20			.starting_index = cpu_to_be32(-1),
     21			.counter_info_version_in = 0,
     22		}
     23	};
     24
     25	r = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
     26			       virt_to_phys(&arg), sizeof(arg));
     27
     28	if (r)
     29		return r;
     30
     31	pr_devel("capability_mask: 0x%x\n", arg.caps.capability_mask);
     32
     33	caps->version = arg.params.counter_info_version_out;
     34	caps->collect_privileged = !!arg.caps.perf_collect_privileged;
     35	caps->ga = !!(arg.caps.capability_mask & HV_GPCI_CM_GA);
     36	caps->expanded = !!(arg.caps.capability_mask & HV_GPCI_CM_EXPANDED);
     37	caps->lab = !!(arg.caps.capability_mask & HV_GPCI_CM_LAB);
     38
     39	return r;
     40}