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Re: [Qemu-devel] [PATCH v6 16/19] target-arm: ensure BQL taken for ARM_C

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH v6 16/19] target-arm: ensure BQL taken for ARM_CP_IO register access
Date: Thu, 10 Nov 2016 18:54:43 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0

On 11/09/2016 03:57 PM, Alex Bennée wrote:
Most ARMCPRegInfo structures just allow updating of the CPU field.
However some have more complex operations that *may* be have cross vCPU
effects therefor need to be serialised. The most obvious examples at the
moment are things that affect the GICv3 IRQ controller. To avoid
applying this requirement to all registers with custom access functions
we check for if the type is marked ARM_CP_IO.

By default all MMIO access to devices already takes the BQL to serialise
hardware emulation.

Signed-off-by: Alex Bennée <address@hidden>
 hw/intc/arm_gicv3_cpuif.c |  3 +++
 target-arm/op_helper.c    | 39 +++++++++++++++++++++++++++++++++++----
 2 files changed, 38 insertions(+), 4 deletions(-)

Reviewed-by: Richard Henderson <address@hidden>


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