e957f6a9b9
For a little while around 4.9, Linux kernels that saw the radix bit in ibm,pa-features would attempt to set up the MMU as if they were a hypervisor, even if they were a guest, which would cause them to crash. Work around this by detecting pre-ISA 3.0 guests by their lack of that bit in option vector 1, and then removing the radix bit from ibm,pa-features. Note: This now requires regeneration of that node after CAS negotiation. Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com> [dwg: Fix style nits] Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
80 lines
3.0 KiB
C
80 lines
3.0 KiB
C
/*
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* QEMU SPAPR Option/Architecture Vector Definitions
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*
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* Each architecture option is organized/documented by the following
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* in LoPAPR 1.1, Table 244:
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*
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* <vector number>: the bit-vector in which the option is located
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* <vector byte>: the byte offset of the vector entry
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* <vector bit>: the bit offset within the vector entry
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*
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* where each vector entry can be one or more bytes.
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*
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* Firmware expects a somewhat literal encoding of this bit-vector
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* structure, where each entry is stored in little-endian so that the
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* byte ordering reflects that of the documentation, but where each bit
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* offset is from "left-to-right" in the traditional representation of
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* a byte value where the MSB is the left-most bit. Thus, each
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* individual byte encodes the option bits in reverse order of the
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* documented bit.
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*
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* These definitions/helpers attempt to abstract away this internal
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* representation so that we can define/set/test for individual option
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* bits using only the documented values. This is done mainly by relying
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* on a bitmap to approximate the documented "bit-vector" structure and
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* handling conversations to-from the internal representation under the
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* covers.
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*
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* Copyright IBM Corp. 2016
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*
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* Authors:
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* Michael Roth <mdroth@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef _SPAPR_OVEC_H
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#define _SPAPR_OVEC_H
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#include "cpu.h"
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#include "migration/vmstate.h"
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typedef struct sPAPROptionVector sPAPROptionVector;
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#define OV_BIT(byte, bit) ((byte - 1) * BITS_PER_BYTE + bit)
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/* option vector 1 */
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#define OV1_PPC_3_00 OV_BIT(3, 0) /* guest supports PowerPC 3.00? */
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/* option vector 5 */
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#define OV5_DRCONF_MEMORY OV_BIT(2, 2)
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#define OV5_FORM1_AFFINITY OV_BIT(5, 0)
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#define OV5_HP_EVT OV_BIT(6, 5)
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/* ISA 3.00 MMU features: */
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#define OV5_MMU_BOTH OV_BIT(24, 0) /* Radix and hash */
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#define OV5_MMU_RADIX_300 OV_BIT(24, 1) /* 1=Radix only, 0=Hash only */
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#define OV5_MMU_RADIX_GTSE OV_BIT(26, 1) /* Radix GTSE */
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/* interfaces */
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sPAPROptionVector *spapr_ovec_new(void);
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sPAPROptionVector *spapr_ovec_clone(sPAPROptionVector *ov_orig);
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void spapr_ovec_intersect(sPAPROptionVector *ov,
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sPAPROptionVector *ov1,
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sPAPROptionVector *ov2);
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bool spapr_ovec_diff(sPAPROptionVector *ov,
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sPAPROptionVector *ov_old,
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sPAPROptionVector *ov_new);
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void spapr_ovec_cleanup(sPAPROptionVector *ov);
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void spapr_ovec_set(sPAPROptionVector *ov, long bitnr);
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void spapr_ovec_clear(sPAPROptionVector *ov, long bitnr);
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bool spapr_ovec_test(sPAPROptionVector *ov, long bitnr);
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sPAPROptionVector *spapr_ovec_parse_vector(target_ulong table_addr, int vector);
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int spapr_ovec_populate_dt(void *fdt, int fdt_offset,
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sPAPROptionVector *ov, const char *name);
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/* migration */
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extern const VMStateDescription vmstate_spapr_ovec;
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#endif /* !defined (_SPAPR_OVEC_H) */
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