1. 14 1月, 2015 1 次提交
  2. 12 1月, 2015 1 次提交
  3. 22 12月, 2014 1 次提交
  4. 20 12月, 2014 1 次提交
  5. 18 12月, 2014 1 次提交
  6. 16 12月, 2014 3 次提交
  7. 15 12月, 2014 1 次提交
    • C
      arm/arm64: KVM: Require in-kernel vgic for the arch timers · 05971120
      Christoffer Dall 提交于
      It is curently possible to run a VM with architected timers support
      without creating an in-kernel VGIC, which will result in interrupts from
      the virtual timer going nowhere.
      
      To address this issue, move the architected timers initialization to the
      time when we run a VCPU for the first time, and then only initialize
      (and enable) the architected timers if we have a properly created and
      initialized in-kernel VGIC.
      
      When injecting interrupts from the virtual timer to the vgic, the
      current setup should ensure that this never calls an on-demand init of
      the VGIC, which is the only call path that could return an error from
      kvm_vgic_inject_irq(), so capture the return value and raise a warning
      if there's an error there.
      
      We also change the kvm_timer_init() function from returning an int to be
      a void function, since the function always succeeds.
      Reviewed-by: NMarc Zyngier <marc.zyngier@arm.com>
      Signed-off-by: NChristoffer Dall <christoffer.dall@linaro.org>
      05971120
  8. 14 12月, 2014 1 次提交
  9. 13 12月, 2014 11 次提交
  10. 12 12月, 2014 1 次提交
    • A
      arch: Add lightweight memory barriers dma_rmb() and dma_wmb() · 1077fa36
      Alexander Duyck 提交于
      There are a number of situations where the mandatory barriers rmb() and
      wmb() are used to order memory/memory operations in the device drivers
      and those barriers are much heavier than they actually need to be.  For
      example in the case of PowerPC wmb() calls the heavy-weight sync
      instruction when for coherent memory operations all that is really needed
      is an lsync or eieio instruction.
      
      This commit adds a coherent only version of the mandatory memory barriers
      rmb() and wmb().  In most cases this should result in the barrier being the
      same as the SMP barriers for the SMP case, however in some cases we use a
      barrier that is somewhere in between rmb() and smp_rmb().  For example on
      ARM the rmb barriers break down as follows:
      
        Barrier   Call     Explanation
        --------- -------- ----------------------------------
        rmb()     dsb()    Data synchronization barrier - system
        dma_rmb() dmb(osh) data memory barrier - outer sharable
        smp_rmb() dmb(ish) data memory barrier - inner sharable
      
      These new barriers are not as safe as the standard rmb() and wmb().
      Specifically they do not guarantee ordering between coherent and incoherent
      memories.  The primary use case for these would be to enforce ordering of
      reads and writes when accessing coherent memory that is shared between the
      CPU and a device.
      
      It may also be noted that there is no dma_mb().  Most architectures don't
      provide a good mechanism for performing a coherent only full barrier without
      resorting to the same mechanism used in mb().  As such there isn't much to
      be gained in trying to define such a function.
      
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
      Cc: Michael Ellerman <michael@ellerman.id.au>
      Cc: Michael Neuling <mikey@neuling.org>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Tony Luck <tony.luck@intel.com>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: David Miller <davem@davemloft.net>
      Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Acked-by: NWill Deacon <will.deacon@arm.com>
      Signed-off-by: NAlexander Duyck <alexander.h.duyck@redhat.com>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      1077fa36
  11. 11 12月, 2014 12 次提交
  12. 10 12月, 2014 1 次提交
  13. 06 12月, 2014 5 次提交