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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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55531b7431
Up to now we always expected to have the storage key facility available for our (non-VSIE) KVM guests. For huge page support, we need to be able to disable it, so let's introduce that now. We add the use_skf variable to manage KVM storage key facility usage. Also we rename use_skey in the mm context struct to uses_skeys to make it more clear that it is an indication that the vm actively uses storage keys. Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com> Reviewed-by: Farhan Ali <alifm@linux.vnet.ibm.com> Reviewed-by: David Hildenbrand <david@redhat.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __MMU_H
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#define __MMU_H
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#include <linux/cpumask.h>
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#include <linux/errno.h>
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typedef struct {
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spinlock_t lock;
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cpumask_t cpu_attach_mask;
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atomic_t flush_count;
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unsigned int flush_mm;
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struct list_head pgtable_list;
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struct list_head gmap_list;
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unsigned long gmap_asce;
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unsigned long asce;
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unsigned long asce_limit;
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unsigned long vdso_base;
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/* The mmu context allocates 4K page tables. */
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unsigned int alloc_pgste:1;
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/* The mmu context uses extended page tables. */
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unsigned int has_pgste:1;
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/* The mmu context uses storage keys. */
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unsigned int uses_skeys:1;
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/* The mmu context uses CMM. */
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unsigned int uses_cmm:1;
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} mm_context_t;
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#define INIT_MM_CONTEXT(name) \
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.context.lock = __SPIN_LOCK_UNLOCKED(name.context.lock), \
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.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \
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.context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
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static inline int tprot(unsigned long addr)
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{
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int rc = -EFAULT;
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asm volatile(
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" tprot 0(%1),0\n"
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"0: ipm %0\n"
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" srl %0,28\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "+d" (rc) : "a" (addr) : "cc");
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return rc;
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}
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#endif
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