[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [For Xen-4.10 RFC PATCH 1/3] Allow control of icache invalidations when calling flush_page_to_ram()
On Fri, 31 Mar 2017, Punit Agrawal wrote: > flush_page_to_ram() unconditionally drops the icache. In certain > situations this leads to execessive icache flushes when > flush_page_to_ram() ends up being repeatedly called in a loop. > > Introduce a parameter to allow callers of flush_page_to_ram() to take > responsibility of synchronising the icache. This is in preparations for > adding logic to make the callers perform the necessary icache > maintenance operations. > > Signed-off-by: Punit Agrawal <punit.agrawal@xxxxxxx> > --- > xen/arch/arm/mm.c | 5 +++-- > xen/arch/arm/p2m.c | 2 +- > xen/common/page_alloc.c | 2 +- > xen/include/asm-arm/page.h | 2 +- > xen/include/asm-x86/flushtlb.h | 2 +- > 5 files changed, 7 insertions(+), 6 deletions(-) > > diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c > index f0a2eddaaf..e1ab5f8694 100644 > --- a/xen/arch/arm/mm.c > +++ b/xen/arch/arm/mm.c > @@ -383,7 +383,7 @@ unsigned long domain_page_map_to_mfn(const void *ptr) > } > #endif > > -void flush_page_to_ram(unsigned long mfn) > +void flush_page_to_ram(unsigned long mfn, bool sync_icache) > { > void *v = map_domain_page(_mfn(mfn)); > > @@ -398,7 +398,8 @@ void flush_page_to_ram(unsigned long mfn) > * I-Cache (See D4.9.2 in ARM DDI 0487A.k_iss10775). Instead of using > flush > * by VA on select platforms, we just flush the entire cache here. > */ > - invalidate_icache(); > + if (sync_icache) coding style is if ( sync_icache ) > + invalidate_icache(); > } > > void __init arch_init_memory(void) > diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c > index 626376090d..76cd1c34f3 100644 > --- a/xen/arch/arm/p2m.c > +++ b/xen/arch/arm/p2m.c > @@ -1400,7 +1400,7 @@ int p2m_cache_flush(struct domain *d, gfn_t start, > unsigned long nr) > /* XXX: Implement preemption */ > while ( gfn_x(start) < gfn_x(next_gfn) ) > { > - flush_page_to_ram(mfn_x(mfn)); > + flush_page_to_ram(mfn_x(mfn), true); > > start = gfn_add(start, 1); > mfn = mfn_add(mfn, 1); > diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c > index 42c20cb201..15450a3b6d 100644 > --- a/xen/common/page_alloc.c > +++ b/xen/common/page_alloc.c > @@ -838,7 +838,7 @@ static struct page_info *alloc_heap_pages( > /* Ensure cache and RAM are consistent for platforms where the > * guest can control its own visibility of/through the cache. > */ > - flush_page_to_ram(page_to_mfn(&pg[i])); > + flush_page_to_ram(page_to_mfn(&pg[i]), true); > } > > spin_unlock(&heap_lock); > diff --git a/xen/include/asm-arm/page.h b/xen/include/asm-arm/page.h > index 4b46e8831c..497b4c86ad 100644 > --- a/xen/include/asm-arm/page.h > +++ b/xen/include/asm-arm/page.h > @@ -407,7 +407,7 @@ static inline void flush_xen_data_tlb_range_va(unsigned > long va, > } > > /* Flush the dcache for an entire page. */ > -void flush_page_to_ram(unsigned long mfn); > +void flush_page_to_ram(unsigned long mfn, bool sync_icache); > > /* > * Print a walk of a page table or p2m > diff --git a/xen/include/asm-x86/flushtlb.h b/xen/include/asm-x86/flushtlb.h > index 8b7adef7c5..bd2be7e482 100644 > --- a/xen/include/asm-x86/flushtlb.h > +++ b/xen/include/asm-x86/flushtlb.h > @@ -118,7 +118,7 @@ void flush_area_mask(const cpumask_t *, const void *va, > unsigned int flags); > #define flush_tlb_one_all(v) \ > flush_tlb_one_mask(&cpu_online_map, v) > > -static inline void flush_page_to_ram(unsigned long mfn) {} > +static inline void flush_page_to_ram(unsigned long mfn, bool sync_icache) {} > static inline int invalidate_dcache_va_range(const void *p, > unsigned long size) > { return -EOPNOTSUPP; } > -- > 2.11.0 > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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