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RISC-V: KVM: add support for SBI_FWFT_MISALIGNED_DELEG

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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@rivosinc.com>
Reviewed-by: Deepak Gupta <debug@rivosinc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20250523101932.1594077-15-cleger@rivosinc.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Clément Léger 2025-05-23 12:19:31 +02:00 committed by Anup Patel
parent 6b72fd1705
commit bb053f816a
1 changed files with 41 additions and 0 deletions
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41
arch/riscv/kvm/vcpu_sbi_fwft.c
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@ -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 *