Hi,
On 22.08.18 20:28, Julien Grall wrote:
Hi,
Please only CC relevant people to the patches. This could be done easily
using the new script add_maintainers.pl.
Oh, I'm sorry. I used get_maintainers.pl.
On 22/08/18 15:11, Volodymyr Babchuk wrote:
Add OP-TEE mediator, so guests can access OP-TEE services.
OP-TEE mediator support address translation for DomUs.
It tracks execution of STD calls, correctly handles memory-related RPC
requests, tracks buffer allocated for RPCs.
With this patch OP-TEE sucessfully passes own tests, while client is
running in DomU.
Signed-off-by: Volodymyr Babchuk <volodymyr_babc...@epam.com>
---
Changes from "RFC":
- Removed special case for Dom0/HwDOM
- No more support for plain OP-TEE (only OP-TEE with virtualization
config enabled is supported)
- Multiple domains is now supported
- Pages that are shared between OP-TEE and domain are now pinned
- Renamed CONFIG_ARM_OPTEE to CONFIG_OPTEE
- Command buffers from domain are now shadowed by XEN
- Mediator now filters out unknown capabilities and requests
- call contexts, shared memory object now stored per-domain
xen/arch/arm/tee/Kconfig | 4 +
xen/arch/arm/tee/Makefile | 1 +
xen/arch/arm/tee/optee.c | 972
++++++++++++++++++++++++++++++++++++
This patch is far to big to get a proper review with understanding of
the code. Can you split it in smaller ones with appropriate commit message?
Yes, it is a quite big. But this is a complete feature. I can't remove
anything from it, because it will not work.
I can split it into series of patches, that will add various pieces of
code... But this will lead to patches with not-working code until the
final one. Is this okay?
From a quick look at it, I would like to understand how the memory
allocated in Xen is bounded for a given guest? Same question for the time.
I store references to allocated pages in per-domain context. But they
are not accounted as a domain memory. This pages are needed by XEN to
conceal real PAs from guest. I'm not sure it they should be accounted as
a memory allocated by domain.
And what about a time? Did you mean time accounting?
I am interested in a normal case but also in the case where someone
malicious is using that API. How much damage can it do to the hypervisor?
Every standard (long-lasting) call requires small amount of memory to
store context. Every shared buffer requires enough memory to store
references to shared pages.
OP-TEE has limited resources, so it will not allow you to create, say,
100 calls and couple of GBs of shared memory. I expect that it will
limit caller in memory overuse.
Apart from that I can't imagine how malicious user can damage the
hypervisor.
--
Volodymyr Babchuk
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