Subject: [PATCH 1/5] KVM: arm64: Fix missing RES1 in emulation of DBGBIDR

From: Marc Zyngier <[email-masked]>
Date: Sun, 16 Feb 2020 18:53:20 +0000

The AArch32 CP14 DBGDIDR has bit 15 set to RES1, which our current
emulation doesn't set. Just add the missing bit.

Reported-by: Peter Maydell <[email-masked]>
Signed-off-by: Marc Zyngier <[email-masked]>
---
 arch/arm64/kvm/sys_regs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 3e909b117f0c..da82c4b03aab 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1658,7 +1658,7 @@ static bool trap_dbgidr(struct kvm_vcpu *vcpu,
 		p->regval = ((((dfr >> ID_AA64DFR0_WRPS_SHIFT) & 0xf) << 28) |
 			     (((dfr >> ID_AA64DFR0_BRPS_SHIFT) & 0xf) << 24) |
 			     (((dfr >> ID_AA64DFR0_CTX_CMPS_SHIFT) & 0xf) << 20)
-			     | (6 << 16) | (el3 << 14) | (el3 << 12));
+			     | (6 << 16) | (1 << 15) | (el3 << 14) | (el3 << 12));
 		return true;
 	}
 }
-- 
2.20.1

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