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// SPDX-License-Identifier: GPL-2.0+
//
// Security related flags and so on.
//
// Copyright 2018, Michael Ellerman, IBM Corporation.
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/seq_buf.h>
#include <asm/security_features.h>
unsigned long powerpc_security_features __read_mostly = \
SEC_FTR_L1D_FLUSH_HV | \
SEC_FTR_L1D_FLUSH_PR | \
SEC_FTR_BNDS_CHK_SPEC_BAR | \
SEC_FTR_FAVOUR_SECURITY;
ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, char *buf)
{
bool thread_priv;
thread_priv = security_ftr_enabled(SEC_FTR_L1D_THREAD_PRIV);
if (rfi_flush || thread_priv) {
struct seq_buf s;
seq_buf_init(&s, buf, PAGE_SIZE - 1);
seq_buf_printf(&s, "Mitigation: ");
if (rfi_flush)
seq_buf_printf(&s, "RFI Flush");
if (rfi_flush && thread_priv)
seq_buf_printf(&s, ", ");
if (thread_priv)
seq_buf_printf(&s, "L1D private per thread");
seq_buf_printf(&s, "\n");
return s.len;
}
if (!security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV) &&
!security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR))
return sprintf(buf, "Not affected\n");
return sprintf(buf, "Vulnerable\n");
}
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