在 2023/12/13 上午1:18, Sean Christopherson 写道:
On Tue, Dec 12, 2023, zhaotianrui wrote:
Hi, Sean:
I want to change the definition of DEFAULT_GUEST_TEST_MEM in the common
file "memstress.h", like this:
/* Default guest test virtual memory offset */
+#ifndef DEFAULT_GUEST_TEST_MEM
#define DEFAULT_GUEST_TEST_MEM 0xc0000000
+#endif
As this address should be re-defined in LoongArch headers.
Why? E.g. is 0xc0000000 unconditionally reserved, not guaranteed to be valid,
something else?
So, do you have any suggesstion?
Hmm, I think ideally kvm_util_base.h would define a range of memory that can be
used by tests for arbitrary data. Multiple tests use 0xc0000000, which is not
entirely arbitrary, i.e. it doesn't _need_ to be 0xc0000000, but 0xc0000000 is
convenient because it's 32-bit addressable and doesn't overlap reserved areas in
other architectures.
Thanks for your explanation, and LoongArch want to define
DEFAULT_GUEST_TEST_MEM to 0x130000000. As default base address for
application loading is 0x120000000, DEFAULT_GUEST_TEST_MEM should be
larger than app loading address, so that PER_VCPU_MEM_SIZE can be large
enough, and kvm selftests app size is smaller than 256M in generic.
Thanks
Tianrui Zhao
