mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Eric FarmanandClaudio Imbrenda
1a4794f17d
There is a possibility that the user_operexec capability only works if facility bit 74 is enabled. This is now fixed, but add a selftest to demonstrate that. Signed-off-by: Eric Farman <farman@linux.ibm.com> Acked-by: Janosch Frank <frankja@linux.ibm.com> Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Message-ID: <20260507200836.3500368-3-farman@linux.ibm.com>
57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright IBM Corp. 2024
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*
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* Authors:
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* Hariharan Mari <hari55@linux.ibm.com>
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*
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* Get the facility bits with the STFLE instruction
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*/
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#ifndef SELFTEST_KVM_FACILITY_H
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#define SELFTEST_KVM_FACILITY_H
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#include <linux/atomic.h>
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#include <linux/bitops.h>
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/* alt_stfle_fac_list[16] + stfle_fac_list[16] */
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#define NB_STFL_DOUBLEWORDS 32
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extern u64 stfl_doublewords[NB_STFL_DOUBLEWORDS];
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extern bool stfle_flag;
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static inline bool clear_bit_inv(unsigned long nr, unsigned long *ptr)
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{
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return clear_bit(nr ^ (BITS_PER_LONG - 1), ptr);
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}
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static inline bool test_bit_inv(unsigned long nr, const unsigned long *ptr)
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{
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return test_bit(nr ^ (BITS_PER_LONG - 1), ptr);
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}
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static inline void stfle(u64 *fac, unsigned int nb_doublewords)
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{
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register unsigned long r0 asm("0") = nb_doublewords - 1;
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asm volatile(" .insn s,0xb2b00000,0(%1)\n"
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: "+d" (r0)
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: "a" (fac)
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: "memory", "cc");
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}
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static inline void setup_facilities(void)
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{
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stfle(stfl_doublewords, NB_STFL_DOUBLEWORDS);
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stfle_flag = true;
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}
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static inline bool test_facility(int nr)
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{
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if (!stfle_flag)
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setup_facilities();
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return test_bit_inv(nr, stfl_doublewords);
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}
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#endif
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