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.c (1634B)

      1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
      2// Copyright (c) 2018 Mellanox Technologies
      3
      4#include <linux/hyperv.h>
      5#include "mlx5_core.h"
      6#include "lib/hv.h"
      7
      8static int mlx5_hv_config_common(struct mlx5_core_dev *dev, void *buf, int len,
      9				 int offset, bool read)
     10{
     11	int rc = -EOPNOTSUPP;
     12	int bytes_returned;
     13	int block_id;
     14
     15	if (offset % HV_CONFIG_BLOCK_SIZE_MAX || len != HV_CONFIG_BLOCK_SIZE_MAX)
     16		return -EINVAL;
     17
     18	block_id = offset / HV_CONFIG_BLOCK_SIZE_MAX;
     19
     20	rc = read ?
     21	     hyperv_read_cfg_blk(dev->pdev, buf,
     22				 HV_CONFIG_BLOCK_SIZE_MAX, block_id,
     23				 &bytes_returned) :
     24	     hyperv_write_cfg_blk(dev->pdev, buf,
     25				  HV_CONFIG_BLOCK_SIZE_MAX, block_id);
     26
     27	/* Make sure len bytes were read successfully  */
     28	if (read && !rc && len != bytes_returned)
     29		rc = -EIO;
     30
     31	if (rc) {
     32		mlx5_core_err(dev, "Failed to %s hv config, err = %d, len = %d, offset = %d\n",
     33			      read ? "read" : "write", rc, len,
     34			      offset);
     35		return rc;
     36	}
     37
     38	return 0;
     39}
     40
     41int mlx5_hv_read_config(struct mlx5_core_dev *dev, void *buf, int len,
     42			int offset)
     43{
     44	return mlx5_hv_config_common(dev, buf, len, offset, true);
     45}
     46
     47int mlx5_hv_write_config(struct mlx5_core_dev *dev, void *buf, int len,
     48			 int offset)
     49{
     50	return mlx5_hv_config_common(dev, buf, len, offset, false);
     51}
     52
     53int mlx5_hv_register_invalidate(struct mlx5_core_dev *dev, void *context,
     54				void (*block_invalidate)(void *context,
     55							 u64 block_mask))
     56{
     57	return hyperv_reg_block_invalidate(dev->pdev, context,
     58					   block_invalidate);
     59}
     60
     61void mlx5_hv_unregister_invalidate(struct mlx5_core_dev *dev)
     62{
     63	hyperv_reg_block_invalidate(dev->pdev, NULL, NULL);
     64}