On 5/15/25 1:22 AM, Clément Léger wrote:
SBI_FWFT_MISALIGNED_DELEG needs hedeleg to be modified to delegate
misaligned load/store exceptions. Save and restore it during CPU
load/put.
Signed-off-by: Clément Léger <cleger@xxxxxxxxxxxx>
Reviewed-by: Deepak Gupta <debug@xxxxxxxxxxxx>
Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
---
arch/riscv/kvm/vcpu_sbi_fwft.c | 41 ++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/arch/riscv/kvm/vcpu_sbi_fwft.c b/arch/riscv/kvm/vcpu_sbi_fwft.c
index b0f66c7bf010..6770c043bbcb 100644
--- a/arch/riscv/kvm/vcpu_sbi_fwft.c
+++ b/arch/riscv/kvm/vcpu_sbi_fwft.c
@@ -14,6 +14,8 @@
#include <asm/kvm_vcpu_sbi.h>
#include <asm/kvm_vcpu_sbi_fwft.h>
+#define MIS_DELEG (BIT_ULL(EXC_LOAD_MISALIGNED) | BIT_ULL(EXC_STORE_MISALIGNED))
+
struct kvm_sbi_fwft_feature {
/**
* @id: Feature ID
@@ -68,7 +70,46 @@ static bool kvm_fwft_is_defined_feature(enum sbi_fwft_feature_t feature)
return false;
}
+static bool kvm_sbi_fwft_misaligned_delegation_supported(struct kvm_vcpu *vcpu)
+{
+ return misaligned_traps_can_delegate();
+}
+
+static long kvm_sbi_fwft_set_misaligned_delegation(struct kvm_vcpu *vcpu,
+ struct kvm_sbi_fwft_config *conf,
+ unsigned long value)
+{
+ struct kvm_vcpu_config *cfg = &vcpu->arch.cfg;
+
+ if (value == 1) {
+ cfg->hedeleg |= MIS_DELEG;
+ csr_set(CSR_HEDELEG, MIS_DELEG);
+ } else if (value == 0) {
+ cfg->hedeleg &= ~MIS_DELEG;
+ csr_clear(CSR_HEDELEG, MIS_DELEG);
+ } else {
+ return SBI_ERR_INVALID_PARAM;
+ }
+
+ return SBI_SUCCESS;
+}
+
+static long kvm_sbi_fwft_get_misaligned_delegation(struct kvm_vcpu *vcpu,
+ struct kvm_sbi_fwft_config *conf,
+ unsigned long *value)
+{
+ *value = (csr_read(CSR_HEDELEG) & MIS_DELEG) == MIS_DELEG;
+
+ return SBI_SUCCESS;
+}
+
static const struct kvm_sbi_fwft_feature features[] = {
+ {
+ .id = SBI_FWFT_MISALIGNED_EXC_DELEG,
+ .supported = kvm_sbi_fwft_misaligned_delegation_supported,
+ .set = kvm_sbi_fwft_set_misaligned_delegation,
+ .get = kvm_sbi_fwft_get_misaligned_delegation,
+ },
};
static struct kvm_sbi_fwft_config *
LGTM.
Reviewed-by: Atish Patra <atishp@xxxxxxxxxxxx>
