[RESEND PATCH] arm64: support more than one crash kernel regions

Simon Horman horms at verge.net.au
Mon Apr 8 02:36:26 PDT 2019


On Mon, Apr 08, 2019 at 05:22:39PM +0800, Chen Zhou wrote:
> When crashkernel is reserved above 4G in memory, kernel should
> reserve some amount of low memory for swiotlb and some DMA buffers.
> So there may be two crash kernel regions, one is below 4G, the other
> is above 4G.
> 
> Currently, there is only one crash kernel region on arm64, and pass
> "linux,usable-memory-range = <BASE SIZE>" property to crash dump
> kernel. Now, we pass
> "linux,usable-memory-range = <BASE1 SIZE1 BASE2 SIZE2>" to crash
> dump kernel to support two crash kernel regions and load crash
> kernel high.
> 
> This patch paves the way for the use of arm64 reserving crashkernel
> above 4G. The details are as below:
> Link: https://lore.kernel.org/linux-arm-kernel/20190403030546.23718-1-chenzhou10@huawei.com/T/#t 
> 
> Signed-off-by: Chen Zhou <chenzhou10 at huawei.com>

Thanks, applied.



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