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KVM: arm64: Introduce a bad_trap() primitive for unexpected trap handling

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In order to ease the debugging of NV, it is helpful to have the kernel
shout at you when an unexpected trap is handled. We already have this
in a couple of cases. Make this a more generic infrastructure that we
will make use of very shortly.

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2023-11-06 16:42:13 +00:00
parent 60ce16cc12
commit 2733dd1070
1 changed files with 15 additions and 8 deletions
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23
arch/arm64/kvm/sys_regs.c
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@ -45,24 +45,31 @@ static u64 sys_reg_to_index(const struct sys_reg_desc *reg);
static int set_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
u64 val);
static bool bad_trap(struct kvm_vcpu *vcpu,
struct sys_reg_params *params,
const struct sys_reg_desc *r,
const char *msg)
{
WARN_ONCE(1, "Unexpected %s\n", msg);
print_sys_reg_instr(params);
kvm_inject_undefined(vcpu);
return false;
}
static bool read_from_write_only(struct kvm_vcpu *vcpu,
struct sys_reg_params *params,
const struct sys_reg_desc *r)
{
WARN_ONCE(1, "Unexpected sys_reg read to write-only register\n");
print_sys_reg_instr(params);
kvm_inject_undefined(vcpu);
return false;
return bad_trap(vcpu, params, r,
"sys_reg read to write-only register");
}
static bool write_to_read_only(struct kvm_vcpu *vcpu,
struct sys_reg_params *params,
const struct sys_reg_desc *r)
{
WARN_ONCE(1, "Unexpected sys_reg write to read-only register\n");
print_sys_reg_instr(params);
kvm_inject_undefined(vcpu);
return false;
return bad_trap(vcpu, params, r,
"sys_reg write to read-only register");
}
u64 vcpu_read_sys_reg(const struct kvm_vcpu *vcpu, int reg)