[PATCH] KVM: arm64: sys_regs: Remove warning about missing pointer auth support

[Dave Martin]

KVM does support pointer auth for guests now, so it is
inappropriate (and confusing) to print a warning to dmesg when
userspace explicitly does not ask for pointer auth to be turned on
for a vcpu.

So, just squash the virtual ptrauth ID_AA64ISAR1_EL1 fields when
appropriate and remove the warning.

Signed-off-by: Dave Martin <Dave.Martin@xxxxxxx>
---
 arch/arm64/kvm/sys_regs.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 7f06c2e..f599f5e 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1082,16 +1082,11 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu,
 
 	if (id == SYS_ID_AA64PFR0_EL1 && !vcpu_has_sve(vcpu)) {
 		val &= ~(0xfUL << ID_AA64PFR0_SVE_SHIFT);
-	} else if (id == SYS_ID_AA64ISAR1_EL1) {
-		const u64 ptrauth_mask = (0xfUL << ID_AA64ISAR1_APA_SHIFT) |
-					 (0xfUL << ID_AA64ISAR1_API_SHIFT) |
-					 (0xfUL << ID_AA64ISAR1_GPA_SHIFT) |
-					 (0xfUL << ID_AA64ISAR1_GPI_SHIFT);
-		if (!vcpu_has_ptrauth(vcpu)) {
-			if (val & ptrauth_mask)
-				kvm_debug("ptrauth unsupported for guests, suppressing\n");
-			val &= ~ptrauth_mask;
-		}
+	} else if (id == SYS_ID_AA64ISAR1_EL1 && !vcpu_has_ptrauth(vcpu)) {
+		val &= ~((0xfUL << ID_AA64ISAR1_APA_SHIFT) |
+			 (0xfUL << ID_AA64ISAR1_API_SHIFT) |
+			 (0xfUL << ID_AA64ISAR1_GPA_SHIFT) |
+			 (0xfUL << ID_AA64ISAR1_GPI_SHIFT));
 	}
 
 	return val;
-- 
2.1.4