KVM: arm64: Populate fault info for watchpoint

When handling ESR_ELx_EC_WATCHPT_LOW, far_el2 member of struct
kvm_vcpu_fault_info will be copied to far member of struct
kvm_debug_exit_arch and exposed to the userspace. The userspace will
see stale values from older faults if the fault info does not get
populated.

Fixes: 8fb2046180a0 ("KVM: arm64: Move early handlers to per-EC handlers")
Suggested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230530024651.10014-1-akihiko.odaki@daynix.com
Cc: stable@vger.kernel.org

diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h
index e78a08a..5c15c58 100644 (file)
--- a/arch/arm64/kvm/hyp/include/hyp/switch.h
+++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
@@ -412,17 +412,21 @@ static bool kvm_hyp_handle_cp15_32(struct kvm_vcpu *vcpu, u64 *exit_code)
        return false;
 }
 
-static bool kvm_hyp_handle_iabt_low(struct kvm_vcpu *vcpu, u64 *exit_code)
+static bool kvm_hyp_handle_memory_fault(struct kvm_vcpu *vcpu, u64 *exit_code)
 {
        if (!__populate_fault_info(vcpu))
                return true;
 
        return false;
 }
+static bool kvm_hyp_handle_iabt_low(struct kvm_vcpu *vcpu, u64 *exit_code)
+       __alias(kvm_hyp_handle_memory_fault);
+static bool kvm_hyp_handle_watchpt_low(struct kvm_vcpu *vcpu, u64 *exit_code)
+       __alias(kvm_hyp_handle_memory_fault);
 
 static bool kvm_hyp_handle_dabt_low(struct kvm_vcpu *vcpu, u64 *exit_code)
 {
-       if (!__populate_fault_info(vcpu))
+       if (kvm_hyp_handle_memory_fault(vcpu, exit_code))
                return true;
 
        if (static_branch_unlikely(&vgic_v2_cpuif_trap)) {

diff --git a/arch/arm64/kvm/hyp/nvhe/switch.c b/arch/arm64/kvm/hyp/nvhe/switch.c
index 71fa16a..7779149 100644 (file)
--- a/arch/arm64/kvm/hyp/nvhe/switch.c
+++ b/arch/arm64/kvm/hyp/nvhe/switch.c
@@ -186,6 +186,7 @@ static const exit_handler_fn hyp_exit_handlers[] = {
        [ESR_ELx_EC_FP_ASIMD]           = kvm_hyp_handle_fpsimd,
        [ESR_ELx_EC_IABT_LOW]           = kvm_hyp_handle_iabt_low,
        [ESR_ELx_EC_DABT_LOW]           = kvm_hyp_handle_dabt_low,
+       [ESR_ELx_EC_WATCHPT_LOW]        = kvm_hyp_handle_watchpt_low,
        [ESR_ELx_EC_PAC]                = kvm_hyp_handle_ptrauth,
 };
 
@@ -196,6 +197,7 @@ static const exit_handler_fn pvm_exit_handlers[] = {
        [ESR_ELx_EC_FP_ASIMD]           = kvm_hyp_handle_fpsimd,
        [ESR_ELx_EC_IABT_LOW]           = kvm_hyp_handle_iabt_low,
        [ESR_ELx_EC_DABT_LOW]           = kvm_hyp_handle_dabt_low,
+       [ESR_ELx_EC_WATCHPT_LOW]        = kvm_hyp_handle_watchpt_low,
        [ESR_ELx_EC_PAC]                = kvm_hyp_handle_ptrauth,
 };
 

diff --git a/arch/arm64/kvm/hyp/vhe/switch.c b/arch/arm64/kvm/hyp/vhe/switch.c
index 3d868e8..7a1aa51 100644 (file)
--- a/arch/arm64/kvm/hyp/vhe/switch.c
+++ b/arch/arm64/kvm/hyp/vhe/switch.c
@@ -110,6 +110,7 @@ static const exit_handler_fn hyp_exit_handlers[] = {
        [ESR_ELx_EC_FP_ASIMD]           = kvm_hyp_handle_fpsimd,
        [ESR_ELx_EC_IABT_LOW]           = kvm_hyp_handle_iabt_low,
        [ESR_ELx_EC_DABT_LOW]           = kvm_hyp_handle_dabt_low,
+       [ESR_ELx_EC_WATCHPT_LOW]        = kvm_hyp_handle_watchpt_low,
        [ESR_ELx_EC_PAC]                = kvm_hyp_handle_ptrauth,
 };