linux_dsm_epyc7002/arch/arm64/kvm/hyp
Christoffer Dall 8f17f5e469 KVM: arm64: Rework hyp_panic for VHE and non-VHE
VHE actually doesn't rely on clearing the VTTBR when returning to the
host kernel, and that is the current key mechanism of hyp_panic to
figure out how to attempt to return to a state good enough to print a
panic statement.

Therefore, we split the hyp_panic function into two functions, a VHE and
a non-VHE, keeping the non-VHE version intact, but changing the VHE
behavior.

The vttbr_el2 check on VHE doesn't really make that much sense, because
the only situation where we can get here on VHE is when the hypervisor
assembly code actually called into hyp_panic, which only happens when
VBAR_EL2 has been set to the KVM exception vectors.  On VHE, we can
always safely disable the traps and restore the host registers at this
point, so we simply do that unconditionally and call into the panic
function directly.

Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2018-03-19 10:53:10 +00:00
..
debug-sr.c Merge branch 'x86/hyperv' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-02-01 15:04:17 +01:00
entry.S KVM: arm64: Avoid storing the vcpu pointer on the stack 2018-03-19 10:53:09 +00:00
fpsimd.S arm64: KVM: Implement fpsimd save/restore 2015-12-14 11:30:41 +00:00
hyp-entry.S KVM: arm64: Avoid storing the vcpu pointer on the stack 2018-03-19 10:53:09 +00:00
Makefile Fixes for interrupt controller emulation in ARM/ARM64 and x86, plus a one-liner 2017-11-04 11:44:55 -07:00
s2-setup.c KVM: arm64: Stop save/restoring host tpidr_el1 on VHE 2018-01-13 10:44:40 +00:00
switch.c KVM: arm64: Rework hyp_panic for VHE and non-VHE 2018-03-19 10:53:10 +00:00
sysreg-sr.c KVM: arm64: Avoid storing the vcpu pointer on the stack 2018-03-19 10:53:09 +00:00
tlb.c KVM: arm/arm64: Detangle kvm_mmu.h from kvm_hyp.h 2018-01-08 15:20:43 +01:00