On Fri, 07 Feb 2025 13:26:41 +0000, Ganapatrao Kulkarni gankulkarni@os.amperecomputing.com wrote:
- if (is_vcpu_nested(vcpu)) {
vcpu_set_reg(vcpu, KVM_ARM64_SYS_REG(SYS_CPTR_EL2), fpen);vcpu_set_reg(vcpu, KVM_ARM64_SYS_REG(SYS_SCTLR_EL2), sctlr_el1);vcpu_set_reg(vcpu, KVM_ARM64_SYS_REG(SYS_TCR_EL2), tcr_el1);vcpu_set_reg(vcpu, KVM_ARM64_SYS_REG(SYS_MAIR_EL2), DEFAULT_MAIR_EL1);vcpu_set_reg(vcpu, KVM_ARM64_SYS_REG(SYS_TTBR0_EL2), ttbr0_el1);vcpu_set_reg(vcpu, KVM_ARM64_SYS_REG(SYS_TPIDR_EL2), vcpu->id);How about some of the basics such as HCR_EL2, MDCR_EL2? A bunch of things there do have an impact on how the guest behaves, and relying on defaults feels like a bad idea.
Sure, I will try to have these registers also set to required value explicitly.
This also assumes VHE, without trying to enforce it.
Ok, I will try to set specific bits of HCR_EL2 to force it run in VHE.
Finally, how to you plan to make all the existing tests run as EL2 guests if TPIDR_EL1 isn't populated with the expected value? Surely you need to change the read side...
OK, I have not yet tried running existing tests modifying to run as EL2 guests. I will try to run them modifying to run in vEL2.
You shouldn't try to modify them. Just make them take a parameter so that the initialisation is done by configuring everything at EL2.
Should we modify them to run as EL2 guests by default, if the host supports/detected NV? or command line argument based run? either in El1(default) or in EL2?
EL1 by default.
BTW, I have also ran all existing tests on L1, most of the tests are passing(atleast I did not see any failure prints).
arm64/debug-exceptions is failing on L1 and needs to be debugged/fixed/skipped. arm64/arch_timer_edge_cases fails on both L0 and L1.
Then I guess you have some work to do to debug these problems, and it once more means that NV is not ready for merging.
M.