[PATCH 57/89] KVM: arm64: Trap debug break and watch from guest

[Will Deacon]

From: Fuad Tabba <tabba at google.com>

Debug and trace are not currently supported for protected guests, so
trap accesses to the related registers and emulate them as RAZ/WI.

Signed-off-by: Fuad Tabba <tabba at google.com>
---
 arch/arm64/kvm/hyp/nvhe/pkvm.c     |  2 +-
 arch/arm64/kvm/hyp/nvhe/sys_regs.c | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/pkvm.c b/arch/arm64/kvm/hyp/nvhe/pkvm.c
index c0403416ce1d..cd0712e13ab0 100644
--- a/arch/arm64/kvm/hyp/nvhe/pkvm.c
+++ b/arch/arm64/kvm/hyp/nvhe/pkvm.c
@@ -108,7 +108,7 @@ static void pvm_init_traps_aa64dfr0(struct kvm_vcpu *vcpu)
 
 	/* Trap Debug */
 	if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_DEBUGVER), feature_ids))
-		mdcr_set |= MDCR_EL2_TDRA | MDCR_EL2_TDA | MDCR_EL2_TDE;
+		mdcr_set |= MDCR_EL2_TDRA | MDCR_EL2_TDA;
 
 	/* Trap OS Double Lock */
 	if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_DOUBLELOCK), feature_ids))
diff --git a/arch/arm64/kvm/hyp/nvhe/sys_regs.c b/arch/arm64/kvm/hyp/nvhe/sys_regs.c
index ddea42d7baf9..e732826f9624 100644
--- a/arch/arm64/kvm/hyp/nvhe/sys_regs.c
+++ b/arch/arm64/kvm/hyp/nvhe/sys_regs.c
@@ -356,6 +356,17 @@ static const struct sys_reg_desc pvm_sys_reg_descs[] = {
 	/* Cache maintenance by set/way operations are restricted. */
 
 	/* Debug and Trace Registers are restricted. */
+	RAZ_WI(SYS_DBGBVRn_EL1(0)),
+	RAZ_WI(SYS_DBGBCRn_EL1(0)),
+	RAZ_WI(SYS_DBGWVRn_EL1(0)),
+	RAZ_WI(SYS_DBGWCRn_EL1(0)),
+	RAZ_WI(SYS_MDSCR_EL1),
+	RAZ_WI(SYS_OSLAR_EL1),
+	RAZ_WI(SYS_OSLSR_EL1),
+	RAZ_WI(SYS_OSDLR_EL1),
+
+	/* Group 1 ID registers */
+	RAZ_WI(SYS_REVIDR_EL1),
 
 	/* AArch64 mappings of the AArch32 ID registers */
 	/* CRm=1 */
-- 
2.36.1.124.g0e6072fb45-goog