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accel/tcg: Add probe_access_flags

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This new interface will allow targets to probe for a page
and then handle watchpoints themselves.  This will be most
useful for vector predicated memory operations, where one
page lookup can be used for many operations, and one test
can avoid many watchpoint checks.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200508154359.7494-6-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2020-05-08 08:43:45 -07:00 • committed by Peter Maydell
parent 7a1bfee682
commit 069cfe77d6
4 changed files with 158 additions and 97 deletions
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13
include/exec/cpu-all.h
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@ -328,7 +328,18 @@ CPUArchState *cpu_copy(CPUArchState *env);
| CPU_INTERRUPT_TGT_EXT_3 \
| CPU_INTERRUPT_TGT_EXT_4)
#if !defined(CONFIG_USER_ONLY)
#ifdef CONFIG_USER_ONLY
/*
* Allow some level of source compatibility with softmmu. We do not
* support any of the more exotic features, so only invalid pages may
* be signaled by probe_access_flags().
*/
#define TLB_INVALID_MASK (1 << (TARGET_PAGE_BITS_MIN - 1))
#define TLB_MMIO 0
#define TLB_WATCHPOINT 0
#else
/*
* Flags stored in the low bits of the TLB virtual address.