mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git
synced 2026-04-14 20:58:26 -04:00
KVM: s390: KVM-specific bitfields and helper functions
Add KVM-s390 specific bitfields and helper functions to manipulate DAT tables. Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda
720
arch/s390/kvm/dat.h
Normal file
720
arch/s390/kvm/dat.h
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@@ -0,0 +1,720 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* KVM guest address space mapping code
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*
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* Copyright IBM Corp. 2024, 2025
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* Author(s): Claudio Imbrenda <imbrenda@linux.ibm.com>
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*/
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#ifndef __KVM_S390_DAT_H
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#define __KVM_S390_DAT_H
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#include <linux/radix-tree.h>
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#include <linux/refcount.h>
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#include <linux/io.h>
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#include <linux/kvm_types.h>
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#include <linux/pgalloc.h>
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#include <asm/tlbflush.h>
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#include <asm/dat-bits.h>
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#define _ASCE(x) ((union asce) { .val = (x), })
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#define NULL_ASCE _ASCE(0)
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enum {
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_DAT_TOKEN_NONE = 0,
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_DAT_TOKEN_PIC,
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};
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#define _CRSTE_TOK(l, t, p) ((union crste) { \
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.tok.i = 1, \
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.tok.tt = (l), \
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.tok.type = (t), \
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.tok.par = (p) \
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})
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#define _CRSTE_PIC(l, p) _CRSTE_TOK(l, _DAT_TOKEN_PIC, p)
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#define _CRSTE_HOLE(l) _CRSTE_PIC(l, PGM_ADDRESSING)
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#define _CRSTE_EMPTY(l) _CRSTE_TOK(l, _DAT_TOKEN_NONE, 0)
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#define _PMD_EMPTY _CRSTE_EMPTY(TABLE_TYPE_SEGMENT)
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#define _PTE_TOK(t, p) ((union pte) { .tok.i = 1, .tok.type = (t), .tok.par = (p) })
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#define _PTE_EMPTY _PTE_TOK(_DAT_TOKEN_NONE, 0)
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/* This fake table type is used for page table walks (both for normal page tables and vSIE) */
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#define TABLE_TYPE_PAGE_TABLE -1
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enum dat_walk_flags {
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DAT_WALK_CONTINUE = 0x20,
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DAT_WALK_IGN_HOLES = 0x10,
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DAT_WALK_SPLIT = 0x08,
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DAT_WALK_ALLOC = 0x04,
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DAT_WALK_ANY = 0x02,
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DAT_WALK_LEAF = 0x01,
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DAT_WALK_DEFAULT = 0
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};
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#define DAT_WALK_SPLIT_ALLOC (DAT_WALK_SPLIT | DAT_WALK_ALLOC)
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#define DAT_WALK_ALLOC_CONTINUE (DAT_WALK_CONTINUE | DAT_WALK_ALLOC)
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#define DAT_WALK_LEAF_ALLOC (DAT_WALK_LEAF | DAT_WALK_ALLOC)
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union pte {
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unsigned long val;
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union page_table_entry h;
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struct {
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unsigned long :56; /* Hardware bits */
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unsigned long u : 1; /* Page unused */
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unsigned long s : 1; /* Special */
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unsigned long w : 1; /* Writable */
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unsigned long r : 1; /* Readable */
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unsigned long d : 1; /* Dirty */
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unsigned long y : 1; /* Young */
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unsigned long sd: 1; /* Soft dirty */
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unsigned long pr: 1; /* Present */
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} s;
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struct {
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unsigned char hwbytes[7];
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unsigned char swbyte;
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};
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union {
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struct {
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unsigned long type :16; /* Token type */
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unsigned long par :16; /* Token parameter */
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unsigned long :20;
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unsigned long : 1; /* Must be 0 */
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unsigned long i : 1; /* Must be 1 */
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unsigned long : 2;
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unsigned long : 7;
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unsigned long pr : 1; /* Must be 0 */
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};
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struct {
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unsigned long token:32; /* Token and parameter */
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unsigned long :32;
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};
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} tok;
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};
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/* Soft dirty, needed as macro for atomic operations on ptes */
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#define _PAGE_SD 0x002
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/* Needed as macro to perform atomic operations */
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#define PGSTE_CMMA_D_BIT 0x0000000000008000UL /* CMMA dirty soft-bit */
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enum pgste_gps_usage {
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PGSTE_GPS_USAGE_STABLE = 0,
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PGSTE_GPS_USAGE_UNUSED,
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PGSTE_GPS_USAGE_POT_VOLATILE,
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PGSTE_GPS_USAGE_VOLATILE,
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};
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union pgste {
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unsigned long val;
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struct {
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unsigned long acc : 4;
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unsigned long fp : 1;
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unsigned long : 3;
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unsigned long pcl : 1;
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unsigned long hr : 1;
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unsigned long hc : 1;
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unsigned long : 2;
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unsigned long gr : 1;
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unsigned long gc : 1;
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unsigned long : 1;
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unsigned long :16; /* val16 */
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unsigned long zero : 1;
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unsigned long nodat : 1;
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unsigned long : 4;
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unsigned long usage : 2;
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unsigned long : 8;
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unsigned long cmma_d : 1; /* Dirty flag for CMMA bits */
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unsigned long prefix_notif : 1; /* Guest prefix invalidation notification */
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unsigned long vsie_notif : 1; /* Referenced in a shadow table */
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unsigned long : 5;
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unsigned long : 8;
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};
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struct {
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unsigned short hwbytes0;
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unsigned short val16; /* Used to store chunked values, see dat_{s,g}et_ptval() */
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unsigned short hwbytes4;
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unsigned char flags; /* Maps to the software bits */
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unsigned char hwbyte7;
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} __packed;
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};
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union pmd {
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unsigned long val;
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union segment_table_entry h;
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struct {
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struct {
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unsigned long :44; /* HW */
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unsigned long : 3; /* Unused */
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unsigned long : 1; /* HW */
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unsigned long w : 1; /* Writable soft-bit */
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unsigned long r : 1; /* Readable soft-bit */
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unsigned long d : 1; /* Dirty */
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unsigned long y : 1; /* Young */
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unsigned long prefix_notif : 1; /* Guest prefix invalidation notification */
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unsigned long : 3; /* HW */
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unsigned long vsie_notif : 1; /* Referenced in a shadow table */
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unsigned long : 1; /* Unused */
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unsigned long : 4; /* HW */
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unsigned long sd : 1; /* Soft-Dirty */
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unsigned long pr : 1; /* Present */
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} fc1;
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} s;
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};
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union pud {
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unsigned long val;
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union region3_table_entry h;
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struct {
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struct {
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unsigned long :33; /* HW */
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unsigned long :14; /* Unused */
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unsigned long : 1; /* HW */
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unsigned long w : 1; /* Writable soft-bit */
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unsigned long r : 1; /* Readable soft-bit */
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unsigned long d : 1; /* Dirty */
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unsigned long y : 1; /* Young */
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unsigned long prefix_notif : 1; /* Guest prefix invalidation notification */
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unsigned long : 3; /* HW */
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unsigned long vsie_notif : 1; /* Referenced in a shadow table */
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unsigned long : 1; /* Unused */
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unsigned long : 4; /* HW */
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unsigned long sd : 1; /* Soft-Dirty */
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unsigned long pr : 1; /* Present */
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} fc1;
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} s;
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};
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union p4d {
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unsigned long val;
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union region2_table_entry h;
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};
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union pgd {
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unsigned long val;
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union region1_table_entry h;
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};
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union crste {
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unsigned long val;
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union {
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struct {
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unsigned long :52;
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unsigned long : 1;
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unsigned long fc: 1;
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unsigned long p : 1;
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unsigned long : 1;
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unsigned long : 2;
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unsigned long i : 1;
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unsigned long : 1;
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unsigned long tt: 2;
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unsigned long : 2;
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};
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struct {
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unsigned long to:52;
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unsigned long : 1;
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unsigned long fc: 1;
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unsigned long p : 1;
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unsigned long : 1;
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unsigned long tf: 2;
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unsigned long i : 1;
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unsigned long : 1;
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unsigned long tt: 2;
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unsigned long tl: 2;
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} fc0;
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struct {
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unsigned long :47;
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unsigned long av : 1; /* ACCF-Validity Control */
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unsigned long acc: 4; /* Access-Control Bits */
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unsigned long f : 1; /* Fetch-Protection Bit */
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unsigned long fc : 1; /* Format-Control */
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unsigned long p : 1; /* DAT-Protection Bit */
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unsigned long iep: 1; /* Instruction-Execution-Protection */
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unsigned long : 2;
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unsigned long i : 1; /* Segment-Invalid Bit */
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unsigned long cs : 1; /* Common-Segment Bit */
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unsigned long tt : 2; /* Table-Type Bits */
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unsigned long : 2;
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} fc1;
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} h;
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struct {
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struct {
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unsigned long :47;
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unsigned long : 1; /* HW (should be 0) */
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unsigned long w : 1; /* Writable */
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unsigned long r : 1; /* Readable */
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unsigned long d : 1; /* Dirty */
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unsigned long y : 1; /* Young */
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unsigned long prefix_notif : 1; /* Guest prefix invalidation notification */
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unsigned long : 3; /* HW */
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unsigned long vsie_notif : 1; /* Referenced in a shadow table */
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unsigned long : 1;
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unsigned long : 4; /* HW */
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unsigned long sd : 1; /* Soft-Dirty */
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unsigned long pr : 1; /* Present */
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} fc1;
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} s;
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union {
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struct {
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unsigned long type :16; /* Token type */
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unsigned long par :16; /* Token parameter */
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unsigned long :26;
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unsigned long i : 1; /* Must be 1 */
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unsigned long : 1;
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unsigned long tt : 2;
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unsigned long : 1;
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unsigned long pr : 1; /* Must be 0 */
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};
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struct {
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unsigned long token:32; /* Token and parameter */
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unsigned long :32;
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};
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} tok;
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union pmd pmd;
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union pud pud;
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union p4d p4d;
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union pgd pgd;
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};
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union skey {
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unsigned char skey;
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struct {
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unsigned char acc :4;
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unsigned char fp :1;
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unsigned char r :1;
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unsigned char c :1;
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unsigned char zero:1;
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};
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};
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static_assert(sizeof(union pgste) == sizeof(unsigned long));
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static_assert(sizeof(union pte) == sizeof(unsigned long));
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static_assert(sizeof(union pmd) == sizeof(unsigned long));
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static_assert(sizeof(union pud) == sizeof(unsigned long));
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static_assert(sizeof(union p4d) == sizeof(unsigned long));
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static_assert(sizeof(union pgd) == sizeof(unsigned long));
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static_assert(sizeof(union crste) == sizeof(unsigned long));
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static_assert(sizeof(union skey) == sizeof(char));
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struct segment_table {
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union pmd pmds[_CRST_ENTRIES];
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};
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struct region3_table {
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union pud puds[_CRST_ENTRIES];
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};
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struct region2_table {
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union p4d p4ds[_CRST_ENTRIES];
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};
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struct region1_table {
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union pgd pgds[_CRST_ENTRIES];
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};
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struct crst_table {
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union {
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union crste crstes[_CRST_ENTRIES];
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struct segment_table segment;
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struct region3_table region3;
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struct region2_table region2;
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struct region1_table region1;
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};
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};
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struct page_table {
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union pte ptes[_PAGE_ENTRIES];
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union pgste pgstes[_PAGE_ENTRIES];
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};
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static_assert(sizeof(struct crst_table) == _CRST_TABLE_SIZE);
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static_assert(sizeof(struct page_table) == PAGE_SIZE);
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/**
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* _pte() - Useful constructor for union pte
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* @pfn: the pfn this pte should point to.
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* @writable: whether the pte should be writable.
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* @dirty: whether the pte should be dirty.
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* @special: whether the pte should be marked as special
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*
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* The pte is also marked as young and present. If the pte is marked as dirty,
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* it gets marked as soft-dirty too. If the pte is not dirty, the hardware
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* protect bit is set (independently of the write softbit); this way proper
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* dirty tracking can be performed.
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*
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* Return: a union pte value.
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*/
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static inline union pte _pte(kvm_pfn_t pfn, bool writable, bool dirty, bool special)
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{
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union pte res = { .val = PFN_PHYS(pfn) };
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res.h.p = !dirty;
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res.s.y = 1;
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res.s.pr = 1;
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res.s.w = writable;
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res.s.d = dirty;
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res.s.sd = dirty;
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res.s.s = special;
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return res;
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}
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static inline union crste _crste_fc0(kvm_pfn_t pfn, int tt)
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{
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union crste res = { .val = PFN_PHYS(pfn) };
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res.h.tt = tt;
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res.h.fc0.tl = _REGION_ENTRY_LENGTH;
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res.h.fc0.tf = 0;
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return res;
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}
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/**
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* _crste() - Useful constructor for union crste with FC=1
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* @pfn: the pfn this pte should point to.
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* @tt: the table type
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* @writable: whether the pte should be writable.
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* @dirty: whether the pte should be dirty.
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*
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* The crste is also marked as young and present. If the crste is marked as
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* dirty, it gets marked as soft-dirty too. If the crste is not dirty, the
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* hardware protect bit is set (independently of the write softbit); this way
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* proper dirty tracking can be performed.
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*
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* Return: a union crste value.
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*/
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static inline union crste _crste_fc1(kvm_pfn_t pfn, int tt, bool writable, bool dirty)
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{
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union crste res = { .val = PFN_PHYS(pfn) & _SEGMENT_MASK };
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res.h.tt = tt;
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res.h.p = !dirty;
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res.h.fc = 1;
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res.s.fc1.y = 1;
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res.s.fc1.pr = 1;
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res.s.fc1.w = writable;
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res.s.fc1.d = dirty;
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res.s.fc1.sd = dirty;
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return res;
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}
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/**
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* struct vsie_rmap - reverse mapping for shadow page table entries
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* @next: pointer to next rmap in the list
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* @r_gfn: virtual rmap address in the shadow guest address space
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*/
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struct vsie_rmap {
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struct vsie_rmap *next;
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union {
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unsigned long val;
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struct {
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long level: 8;
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unsigned long : 4;
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unsigned long r_gfn:52;
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};
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};
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};
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static_assert(sizeof(struct vsie_rmap) == 2 * sizeof(long));
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static inline struct crst_table *crste_table_start(union crste *crstep)
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{
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return (struct crst_table *)ALIGN_DOWN((unsigned long)crstep, _CRST_TABLE_SIZE);
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}
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static inline struct page_table *pte_table_start(union pte *ptep)
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{
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return (struct page_table *)ALIGN_DOWN((unsigned long)ptep, _PAGE_TABLE_SIZE);
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}
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static inline bool crdte_crste(union crste *crstep, union crste old, union crste new, gfn_t gfn,
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union asce asce)
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{
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unsigned long dtt = 0x10 | new.h.tt << 2;
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void *table = crste_table_start(crstep);
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return crdte(old.val, new.val, table, dtt, gfn_to_gpa(gfn), asce.val);
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}
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/**
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* idte_crste() - invalidate a crste entry using idte
|
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* @crstep: pointer to the crste to be invalidated
|
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* @gfn: a gfn mapped by the crste
|
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* @opt: options for the idte instruction
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* @asce: the asce
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* @local: whether the operation is cpu-local
|
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*/
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static __always_inline void idte_crste(union crste *crstep, gfn_t gfn, unsigned long opt,
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union asce asce, int local)
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{
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unsigned long table_origin = __pa(crste_table_start(crstep));
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unsigned long gaddr = gfn_to_gpa(gfn) & HPAGE_MASK;
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if (__builtin_constant_p(opt) && opt == 0) {
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/* flush without guest asce */
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asm volatile("idte %[table_origin],0,%[gaddr],%[local]"
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: "+m" (*crstep)
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: [table_origin] "a" (table_origin), [gaddr] "a" (gaddr),
|
||||
[local] "i" (local)
|
||||
: "cc");
|
||||
} else {
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||||
/* flush with guest asce */
|
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asm volatile("idte %[table_origin],%[asce],%[gaddr_opt],%[local]"
|
||||
: "+m" (*crstep)
|
||||
: [table_origin] "a" (table_origin), [gaddr_opt] "a" (gaddr | opt),
|
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[asce] "a" (asce.val), [local] "i" (local)
|
||||
: "cc");
|
||||
}
|
||||
}
|
||||
|
||||
static inline void dat_init_pgstes(struct page_table *pt, unsigned long val)
|
||||
{
|
||||
memset64((void *)pt->pgstes, val, PTRS_PER_PTE);
|
||||
}
|
||||
|
||||
static inline void dat_init_page_table(struct page_table *pt, unsigned long ptes,
|
||||
unsigned long pgstes)
|
||||
{
|
||||
memset64((void *)pt->ptes, ptes, PTRS_PER_PTE);
|
||||
dat_init_pgstes(pt, pgstes);
|
||||
}
|
||||
|
||||
static inline gfn_t asce_end(union asce asce)
|
||||
{
|
||||
return 1ULL << ((asce.dt + 1) * 11 + _SEGMENT_SHIFT - PAGE_SHIFT);
|
||||
}
|
||||
|
||||
#define _CRSTE(x) ((union crste) { .val = _Generic((x), \
|
||||
union pgd : (x).val, \
|
||||
union p4d : (x).val, \
|
||||
union pud : (x).val, \
|
||||
union pmd : (x).val, \
|
||||
union crste : (x).val)})
|
||||
|
||||
#define _CRSTEP(x) ((union crste *)_Generic((*(x)), \
|
||||
union pgd : (x), \
|
||||
union p4d : (x), \
|
||||
union pud : (x), \
|
||||
union pmd : (x), \
|
||||
union crste : (x)))
|
||||
|
||||
#define _CRSTP(x) ((struct crst_table *)_Generic((*(x)), \
|
||||
struct crst_table : (x), \
|
||||
struct segment_table : (x), \
|
||||
struct region3_table : (x), \
|
||||
struct region2_table : (x), \
|
||||
struct region1_table : (x)))
|
||||
|
||||
static inline bool asce_contains_gfn(union asce asce, gfn_t gfn)
|
||||
{
|
||||
return gfn < asce_end(asce);
|
||||
}
|
||||
|
||||
static inline bool is_pmd(union crste crste)
|
||||
{
|
||||
return crste.h.tt == TABLE_TYPE_SEGMENT;
|
||||
}
|
||||
|
||||
static inline bool is_pud(union crste crste)
|
||||
{
|
||||
return crste.h.tt == TABLE_TYPE_REGION3;
|
||||
}
|
||||
|
||||
static inline bool is_p4d(union crste crste)
|
||||
{
|
||||
return crste.h.tt == TABLE_TYPE_REGION2;
|
||||
}
|
||||
|
||||
static inline bool is_pgd(union crste crste)
|
||||
{
|
||||
return crste.h.tt == TABLE_TYPE_REGION1;
|
||||
}
|
||||
|
||||
static inline phys_addr_t pmd_origin_large(union pmd pmd)
|
||||
{
|
||||
return pmd.val & _SEGMENT_ENTRY_ORIGIN_LARGE;
|
||||
}
|
||||
|
||||
static inline phys_addr_t pud_origin_large(union pud pud)
|
||||
{
|
||||
return pud.val & _REGION3_ENTRY_ORIGIN_LARGE;
|
||||
}
|
||||
|
||||
/**
|
||||
* crste_origin_large() - Return the large frame origin of a large crste
|
||||
* @crste: The crste whose origin is to be returned. Should be either a
|
||||
* region-3 table entry or a segment table entry, in both cases with
|
||||
* FC set to 1 (large pages).
|
||||
*
|
||||
* Return: The origin of the large frame pointed to by @crste, or -1 if the
|
||||
* crste was not large (wrong table type, or FC==0)
|
||||
*/
|
||||
static inline phys_addr_t crste_origin_large(union crste crste)
|
||||
{
|
||||
if (unlikely(!crste.h.fc || crste.h.tt > TABLE_TYPE_REGION3))
|
||||
return -1;
|
||||
if (is_pmd(crste))
|
||||
return pmd_origin_large(crste.pmd);
|
||||
return pud_origin_large(crste.pud);
|
||||
}
|
||||
|
||||
#define crste_origin(x) (_Generic((x), \
|
||||
union pmd : (x).val & _SEGMENT_ENTRY_ORIGIN, \
|
||||
union pud : (x).val & _REGION_ENTRY_ORIGIN, \
|
||||
union p4d : (x).val & _REGION_ENTRY_ORIGIN, \
|
||||
union pgd : (x).val & _REGION_ENTRY_ORIGIN))
|
||||
|
||||
static inline unsigned long pte_origin(union pte pte)
|
||||
{
|
||||
return pte.val & PAGE_MASK;
|
||||
}
|
||||
|
||||
static inline bool pmd_prefix(union pmd pmd)
|
||||
{
|
||||
return pmd.h.fc && pmd.s.fc1.prefix_notif;
|
||||
}
|
||||
|
||||
static inline bool pud_prefix(union pud pud)
|
||||
{
|
||||
return pud.h.fc && pud.s.fc1.prefix_notif;
|
||||
}
|
||||
|
||||
static inline bool crste_leaf(union crste crste)
|
||||
{
|
||||
return (crste.h.tt <= TABLE_TYPE_REGION3) && crste.h.fc;
|
||||
}
|
||||
|
||||
static inline bool crste_prefix(union crste crste)
|
||||
{
|
||||
return crste_leaf(crste) && crste.s.fc1.prefix_notif;
|
||||
}
|
||||
|
||||
static inline bool crste_dirty(union crste crste)
|
||||
{
|
||||
return crste_leaf(crste) && crste.s.fc1.d;
|
||||
}
|
||||
|
||||
static inline union pgste *pgste_of(union pte *pte)
|
||||
{
|
||||
return (union pgste *)(pte + _PAGE_ENTRIES);
|
||||
}
|
||||
|
||||
static inline bool pte_hole(union pte pte)
|
||||
{
|
||||
return pte.h.i && !pte.tok.pr && pte.tok.type != _DAT_TOKEN_NONE;
|
||||
}
|
||||
|
||||
static inline bool _crste_hole(union crste crste)
|
||||
{
|
||||
return crste.h.i && !crste.tok.pr && crste.tok.type != _DAT_TOKEN_NONE;
|
||||
}
|
||||
|
||||
#define crste_hole(x) _crste_hole(_CRSTE(x))
|
||||
|
||||
static inline bool _crste_none(union crste crste)
|
||||
{
|
||||
return crste.h.i && !crste.tok.pr && crste.tok.type == _DAT_TOKEN_NONE;
|
||||
}
|
||||
|
||||
#define crste_none(x) _crste_none(_CRSTE(x))
|
||||
|
||||
static inline phys_addr_t large_pud_to_phys(union pud pud, gfn_t gfn)
|
||||
{
|
||||
return pud_origin_large(pud) | (gfn_to_gpa(gfn) & ~_REGION3_MASK);
|
||||
}
|
||||
|
||||
static inline phys_addr_t large_pmd_to_phys(union pmd pmd, gfn_t gfn)
|
||||
{
|
||||
return pmd_origin_large(pmd) | (gfn_to_gpa(gfn) & ~_SEGMENT_MASK);
|
||||
}
|
||||
|
||||
static inline phys_addr_t large_crste_to_phys(union crste crste, gfn_t gfn)
|
||||
{
|
||||
if (unlikely(!crste.h.fc || crste.h.tt > TABLE_TYPE_REGION3))
|
||||
return -1;
|
||||
if (is_pmd(crste))
|
||||
return large_pmd_to_phys(crste.pmd, gfn);
|
||||
return large_pud_to_phys(crste.pud, gfn);
|
||||
}
|
||||
|
||||
static inline bool cspg_crste(union crste *crstep, union crste old, union crste new)
|
||||
{
|
||||
return cspg(&crstep->val, old.val, new.val);
|
||||
}
|
||||
|
||||
static inline struct page_table *dereference_pmd(union pmd pmd)
|
||||
{
|
||||
return phys_to_virt(crste_origin(pmd));
|
||||
}
|
||||
|
||||
static inline struct segment_table *dereference_pud(union pud pud)
|
||||
{
|
||||
return phys_to_virt(crste_origin(pud));
|
||||
}
|
||||
|
||||
static inline struct region3_table *dereference_p4d(union p4d p4d)
|
||||
{
|
||||
return phys_to_virt(crste_origin(p4d));
|
||||
}
|
||||
|
||||
static inline struct region2_table *dereference_pgd(union pgd pgd)
|
||||
{
|
||||
return phys_to_virt(crste_origin(pgd));
|
||||
}
|
||||
|
||||
static inline struct crst_table *_dereference_crste(union crste crste)
|
||||
{
|
||||
if (unlikely(is_pmd(crste)))
|
||||
return NULL;
|
||||
return phys_to_virt(crste_origin(crste.pud));
|
||||
}
|
||||
|
||||
#define dereference_crste(x) (_Generic((x), \
|
||||
union pud : _dereference_crste(_CRSTE(x)), \
|
||||
union p4d : _dereference_crste(_CRSTE(x)), \
|
||||
union pgd : _dereference_crste(_CRSTE(x)), \
|
||||
union crste : _dereference_crste(_CRSTE(x))))
|
||||
|
||||
static inline struct crst_table *dereference_asce(union asce asce)
|
||||
{
|
||||
return phys_to_virt(asce.val & _ASCE_ORIGIN);
|
||||
}
|
||||
|
||||
static inline void asce_flush_tlb(union asce asce)
|
||||
{
|
||||
__tlb_flush_idte(asce.val);
|
||||
}
|
||||
|
||||
static inline bool pgste_get_trylock(union pte *ptep, union pgste *res)
|
||||
{
|
||||
union pgste *pgstep = pgste_of(ptep);
|
||||
union pgste old_pgste;
|
||||
|
||||
if (READ_ONCE(pgstep->val) & PGSTE_PCL_BIT)
|
||||
return false;
|
||||
old_pgste.val = __atomic64_or_barrier(PGSTE_PCL_BIT, &pgstep->val);
|
||||
if (old_pgste.pcl)
|
||||
return false;
|
||||
old_pgste.pcl = 1;
|
||||
*res = old_pgste;
|
||||
return true;
|
||||
}
|
||||
|
||||
static inline union pgste pgste_get_lock(union pte *ptep)
|
||||
{
|
||||
union pgste res;
|
||||
|
||||
while (!pgste_get_trylock(ptep, &res))
|
||||
cpu_relax();
|
||||
return res;
|
||||
}
|
||||
|
||||
static inline void pgste_set_unlock(union pte *ptep, union pgste pgste)
|
||||
{
|
||||
pgste.pcl = 0;
|
||||
barrier();
|
||||
WRITE_ONCE(*pgste_of(ptep), pgste);
|
||||
}
|
||||
|
||||
#endif /* __KVM_S390_DAT_H */
|
||||
Reference in New Issue
Block a user