| Message ID | 20200519172028.31169-1-julien@xen.org (mailing list archive) |
|---|---|
| Headers | show |
| Series | Remove the 1GB limitation on Rasberry Pi 4 | expand |
On Tue, 19 May 2020, Julien Grall wrote: > From: Julien Grall <jgrall@amazon.com> > > Hi all, > > At the moment, a user who wants to boot Xen on the Raspberry Pi 4 can > only use the first GB of memory. > > This is because several devices cannot DMA above 1GB but Xen doesn't > necessarily allocate memory for Dom0 below 1GB. > > This small series is trying to address the problem by allowing a > platform to restrict where Dom0 banks are allocated. > > This is also a candidate for Xen 4.14. Without it, a user will not be > able to use all the RAM on the Raspberry Pi 4. > > This series has only be slighlty tested. I would appreciate more test on > the Rasbperry Pi 4 to confirm this removing the restriction. You can add my reviewed-by to all patches in the series.
From: Julien Grall <jgrall@amazon.com> Hi all, At the moment, a user who wants to boot Xen on the Raspberry Pi 4 can only use the first GB of memory. This is because several devices cannot DMA above 1GB but Xen doesn't necessarily allocate memory for Dom0 below 1GB. This small series is trying to address the problem by allowing a platform to restrict where Dom0 banks are allocated. This is also a candidate for Xen 4.14. Without it, a user will not be able to use all the RAM on the Raspberry Pi 4. This series has only be slighlty tested. I would appreciate more test on the Rasbperry Pi 4 to confirm this removing the restriction. Cheers, Cc: paul@xen.org Julien Grall (3): xen/arm: Allow a platform to override the DMA width xen/arm: Take into account the DMA width when allocating Dom0 memory banks xen/arm: plat: Allocate as much as possible memory below 1GB for dom0 for RPI xen/arch/arm/domain_build.c | 33 +++++++++++++--------- xen/arch/arm/platform.c | 5 ++++ xen/arch/arm/platforms/brcm-raspberry-pi.c | 1 + xen/include/asm-arm/mm.h | 2 ++ xen/include/asm-arm/numa.h | 5 ---- xen/include/asm-arm/platform.h | 2 ++ 6 files changed, 29 insertions(+), 19 deletions(-)