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m8q7Yjc9r+Fkiqg6ls+kOF/1DFiub9kFNY2cSkGvkFqw8Qmj4Vl1WGR+3tYuy8ztRV024V/mCZtHcxFSmK+bi3GIwKCCC4znK0gAf5kZY1jz0OyLbdc8xWZcfzBubYmDEbDPIYPkFq3zTgb2XvqGTsbVSY4apJy4k0dFJV/kPS5z76yxIZvRVHyYnM0tR4GcMrVQ+PJhKvYzsrgE0n24xnF9Xtw3pZ41ecYMiylK+TxFKLJErpaIL21+PlR6cDusPi6dksIOaenv/Qf+SJf/81Lx1HtN6Y1IZblLE8XPr4cNRiYM28pFBJDak/frQi40ASECiSyKHS34nAHhyHIIRF9GcFvWOx790UkeEcoTcMwH5+dkyZX+IsFD4hrWx0Bcd0T99We0Sr456iflBgk8YMPCTyKeg3pvXPI4EIxa1QvnZ9B7Hfmby+hUJTjAfAOBk99Br X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 12/30/24 11:53, Rik van Riel wrote: > Use broadcast TLB invalidation for kernel addresses when available. > > This stops us from having to send IPIs for kernel TLB flushes. > > Signed-off-by: Rik van Riel > --- > arch/x86/mm/tlb.c | 31 +++++++++++++++++++++++++++++++ > 1 file changed, 31 insertions(+) > > diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c > index 6cf881a942bb..29207dc5b807 100644 > --- a/arch/x86/mm/tlb.c > +++ b/arch/x86/mm/tlb.c > @@ -1077,6 +1077,32 @@ void flush_tlb_all(void) > on_each_cpu(do_flush_tlb_all, NULL, 1); > } > > +static void broadcast_kernel_range_flush(unsigned long start, unsigned long end) > +{ > + unsigned long addr; > + unsigned long maxnr = invlpgb_count_max; > + unsigned long threshold = tlb_single_page_flush_ceiling * maxnr; > + > + /* > + * TLBSYNC only waits for flushes originating on the same CPU. > + * Disabling migration allows us to wait on all flushes. > + */ > + guard(preempt)(); > + > + if (end == TLB_FLUSH_ALL || > + (end - start) > threshold << PAGE_SHIFT) { > + invlpgb_flush_all(); > + } else { > + unsigned long nr; > + for (addr = start; addr < end; addr += nr << PAGE_SHIFT) { > + nr = min((end - addr) >> PAGE_SHIFT, maxnr); > + invlpgb_flush_addr(addr, nr); > + } Would it be better to put this loop in the actual invlpgb_flush* function(s)? Then callers don't have to worry about it, similar to what is done in clflush_cache_range() / clflush_cache_range_opt(). Thanks, Tom > + } > + > + tlbsync(); > +} > + > static void do_kernel_range_flush(void *info) > { > struct flush_tlb_info *f = info; > @@ -1089,6 +1115,11 @@ static void do_kernel_range_flush(void *info) > > void flush_tlb_kernel_range(unsigned long start, unsigned long end) > { > + if (cpu_feature_enabled(X86_FEATURE_INVLPGB)) { > + broadcast_kernel_range_flush(start, end); > + return; > + } > + > /* Balance as user space task's flush, a bit conservative */ > if (end == TLB_FLUSH_ALL || > (end - start) > tlb_single_page_flush_ceiling << PAGE_SHIFT) {