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b79a9b6e5b
In6d03226b42we set TLB_MMIO to a non-zero value for user-only so that we could return a non-zero value from probe_* functions so that we could force callers like Arm SVE vector moves to use the slow path rather than direct access. All for the sake of exposing these accesses to plugins. Back then, TLB_FORCE_SLOW did not exist, so TLB_MMIO seemed like a reasonable solution. However, user-only doesn't really have MMIO and this has knock-on effects, like forcing Arm SVE first-fault vector loads to stop. Better to use TLB_FORCE_SLOW as a more exact trigger for plugins. Cc: qemu-stable@nongnu.org Fixes:6d03226b42("plugins: force slow path when plugins instrument memory ops") Acked-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-ID: <20260702171057.47998-1-richard.henderson@linaro.org>
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/*
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* TLB flags definition
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef TLB_FLAGS_H
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#define TLB_FLAGS_H
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/*
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* Flags returned for lookup of a TLB virtual address.
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*/
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#ifdef CONFIG_USER_ONLY
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/*
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* Allow some level of source compatibility with softmmu.
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* INVALID is set when the page does not have requested permissions.
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* FORCE_SLOW is set when we want the target helper to use the functional
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* interface for load/store so that plugins see the access.
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*/
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#define TLB_INVALID_MASK (1 << 0)
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#define TLB_FORCE_SLOW (1 << 1)
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#define TLB_MMIO 0
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#define TLB_WATCHPOINT 0
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#else
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/*
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* Flags stored in CPUTLBEntryFull.slow_flags[x].
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* TLB_FORCE_SLOW must be set in CPUTLBEntry.addr_idx[x].
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*/
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/* Set if TLB entry requires byte swap. */
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#define TLB_BSWAP (1 << 0)
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/* Set if TLB entry contains a watchpoint. */
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#define TLB_WATCHPOINT (1 << 1)
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/* Set if TLB entry requires aligned accesses. */
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#define TLB_CHECK_ALIGNED (1 << 2)
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/* Set if TLB entry writes ignored. */
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#define TLB_DISCARD_WRITE (1 << 3)
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/* Set if TLB entry is an IO callback. */
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#define TLB_MMIO (1 << 4)
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#define TLB_SLOW_FLAGS_MASK \
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(TLB_BSWAP | TLB_WATCHPOINT | TLB_CHECK_ALIGNED | \
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TLB_DISCARD_WRITE | TLB_MMIO)
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/*
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* Flags stored in CPUTLBEntry.addr_idx[x].
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* These must be above the largest alignment (64 bytes),
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* and below the smallest page size (1024 bytes).
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* This leaves bits [9:6] available for use.
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*/
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/* Zero if TLB entry is valid. */
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#define TLB_INVALID_MASK (1 << 6)
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/* Set if TLB entry references a clean RAM page. */
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#define TLB_NOTDIRTY (1 << 7)
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/* Set if the slow path must be used; more flags in CPUTLBEntryFull. */
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#define TLB_FORCE_SLOW (1 << 8)
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/*
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* Use this mask to check interception with an alignment mask
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* in a TCG backend.
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*/
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#define TLB_FLAGS_MASK \
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(TLB_INVALID_MASK | TLB_NOTDIRTY | TLB_FORCE_SLOW)
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/* The two sets of flags must not overlap. */
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QEMU_BUILD_BUG_ON(TLB_FLAGS_MASK & TLB_SLOW_FLAGS_MASK);
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#endif /* !CONFIG_USER_ONLY */
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#endif /* TLB_FLAGS_H */
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