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cputlb: introduce tlb_flush_* async work.

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Some architectures allow to flush the tlb of other VCPUs. This is not a problem
when we have only one thread for all VCPUs but it definitely needs to be an
asynchronous work when we are in true multithreaded work.

We take the tb_lock() when doing this to avoid racing with other threads
which may be invalidating TB's at the same time. The alternative would
be to use proper atomic primitives to clear the tlb entries en-mass.

This patch doesn't do anything to protect other cputlb function being
called in MTTCG mode making cross vCPU changes.

Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
[AJB: remove need for g_malloc on defer, make check fixes, tb_lock]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
KONRAD Frederic 2017-02-23 18:29:18 +00:00 • committed by Alex Bennée
parent 857baec1d9
commit e3b9ca8109
3 changed files with 71 additions and 2 deletions
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1
include/exec/exec-all.h
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@ -158,6 +158,7 @@ void tlb_set_page(CPUState *cpu, target_ulong vaddr,
void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr);
void probe_write(CPUArchState *env, target_ulong addr, int mmu_idx,
uintptr_t retaddr);
void tlb_flush_page_all(target_ulong addr);
#else
static inline void tlb_flush_page(CPUState *cpu, target_ulong addr)
{