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authorMark Rutland <mark.rutland@arm.com>2019-12-05 19:06:52 +0100
committerMarc Zyngier <maz@kernel.org>2019-12-06 20:37:48 +0100
commit54ad68b7776043a77c9bf0a67d49cd9cb261a8e7 (patch)
treedabf89f5f616ebc996fb1a1456af6142ce83a5c4 /arch/arm64
parentKVM: arm64: Sanely ratelimit sysreg messages (diff)
downloadlinux-54ad68b7776043a77c9bf0a67d49cd9cb261a8e7.tar.xz
linux-54ad68b7776043a77c9bf0a67d49cd9cb261a8e7.zip
KVM: arm64: Don't log IMP DEF sysreg traps
We don't intend to support IMPLEMENATION DEFINED system registers, but have to trap them (and emulate them as UNDEFINED). These traps aren't interesting to the system administrator or to the KVM developers, so let's not bother logging when we do so. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20191205180652.18671-3-mark.rutland@arm.com
Diffstat (limited to 'arch/arm64')
-rw-r--r--arch/arm64/kvm/sys_regs.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index e8bf08e09f78..bd2ac3796d8d 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -2229,6 +2229,12 @@ int kvm_handle_cp14_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
NULL, 0);
}
+static bool is_imp_def_sys_reg(struct sys_reg_params *params)
+{
+ // See ARM DDI 0487E.a, section D12.3.2
+ return params->Op0 == 3 && (params->CRn & 0b1011) == 0b1011;
+}
+
static int emulate_sys_reg(struct kvm_vcpu *vcpu,
struct sys_reg_params *params)
{
@@ -2244,6 +2250,8 @@ static int emulate_sys_reg(struct kvm_vcpu *vcpu,
if (likely(r)) {
perform_access(vcpu, params, r);
+ } else if (is_imp_def_sys_reg(params)) {
+ kvm_inject_undefined(vcpu);
} else {
print_sys_reg_msg(params,
"Unsupported guest sys_reg access at: %lx [%08lx]\n",