unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
1
Fork 0
Code Pull requests 5 Wiki Activity

arm64: kvm: decode ESR_ELx.EC when reporting exceptions

Browse source 
To aid the developer when something triggers an unexpected exception,
decode the ESR_ELx.EC field when logging an ESR_ELx value using the
newly introduced esr_get_class_string. This doesn't tell the developer
the specifics of the exception encoded in the remaining IL and ISS bits,
but it can be helpful to distinguish between exception classes (e.g.
SError and a data abort) without having to manually decode the field,
which can be tiresome.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mark Rutland 2015-01-07 11:26:18 +00:00
parent 6e53031ed8
commit 056bb5f51c
1 changed files with 4 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
arch/arm64/kvm/handle_exit.c
View file

@ -91,12 +91,13 @@ static exit_handle_fn arm_exit_handlers[] = {
static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
{
u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu);
u32 hsr = kvm_vcpu_get_hsr(vcpu);
u8 hsr_ec = hsr >> ESR_ELx_EC_SHIFT;
if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) ||
!arm_exit_handlers[hsr_ec]) {
kvm_err("Unknown exception class: hsr: %#08x\n",
(unsigned int)kvm_vcpu_get_hsr(vcpu));
kvm_err("Unknown exception class: hsr: %#08x -- %s\n",
hsr, esr_get_class_string(hsr));
BUG();
}