We extend the KVM ISA extension ONE_REG interface to allow VMM tools to
detect and enable Svade and Svadu extensions for Guest/VM. Since the
henvcfg.ADUE is read-only zero if the menvcfg.ADUE is zero, the Svadu
extension is available for Guest/VM and the Svade extension is allowed
to disabledonly when arch_has_hw_pte_young() is true.
Signed-off-by: Yong-Xuan Wang <yongxuan.wang@xxxxxxxxxx>
Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
---
arch/riscv/include/uapi/asm/kvm.h | 2 ++
arch/riscv/kvm/vcpu.c | 3 +++
arch/riscv/kvm/vcpu_onereg.c | 15 +++++++++++++++
3 files changed, 20 insertions(+)
diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
index e878e7cc3978..a5e0c35d7e9a 100644
--- a/arch/riscv/include/uapi/asm/kvm.h
+++ b/arch/riscv/include/uapi/asm/kvm.h
@@ -168,6 +168,8 @@ enum KVM_RISCV_ISA_EXT_ID {
KVM_RISCV_ISA_EXT_ZTSO,
KVM_RISCV_ISA_EXT_ZACAS,
KVM_RISCV_ISA_EXT_SSCOFPMF,
+ KVM_RISCV_ISA_EXT_SVADE,
+ KVM_RISCV_ISA_EXT_SVADU,
KVM_RISCV_ISA_EXT_MAX,
};
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index 17e21df36cc1..64a15af459e0 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -540,6 +540,9 @@ static void kvm_riscv_vcpu_setup_config(struct kvm_vcpu *vcpu)
if (riscv_isa_extension_available(isa, ZICBOZ))
cfg->henvcfg |= ENVCFG_CBZE;
+ if (riscv_isa_extension_available(isa, SVADU))
+ cfg->henvcfg |= ENVCFG_ADUE;
+
if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SMSTATEEN)) {
cfg->hstateen0 |= SMSTATEEN0_HSENVCFG;
if (riscv_isa_extension_available(isa, SSAIA))
diff --git a/arch/riscv/kvm/vcpu_onereg.c b/arch/riscv/kvm/vcpu_onereg.c
index 62874fbca29f..474fdeafe9fe 100644
--- a/arch/riscv/kvm/vcpu_onereg.c
+++ b/arch/riscv/kvm/vcpu_onereg.c
@@ -15,6 +15,7 @@
#include <asm/cacheflush.h>
#include <asm/cpufeature.h>
#include <asm/kvm_vcpu_vector.h>
+#include <asm/pgtable.h>
#include <asm/vector.h>
#define KVM_RISCV_BASE_ISA_MASK GENMASK(25, 0)
@@ -38,6 +39,8 @@ static const unsigned long kvm_isa_ext_arr[] = {
KVM_ISA_EXT_ARR(SSAIA),
KVM_ISA_EXT_ARR(SSCOFPMF),
KVM_ISA_EXT_ARR(SSTC),
+ KVM_ISA_EXT_ARR(SVADE),
+ KVM_ISA_EXT_ARR(SVADU),
KVM_ISA_EXT_ARR(SVINVAL),
KVM_ISA_EXT_ARR(SVNAPOT),
KVM_ISA_EXT_ARR(SVPBMT),
@@ -105,6 +108,12 @@ static bool kvm_riscv_vcpu_isa_enable_allowed(unsigned long ext)
return __riscv_isa_extension_available(NULL, RISCV_ISA_EXT_SSAIA);
case KVM_RISCV_ISA_EXT_V:
return riscv_v_vstate_ctrl_user_allowed();
+ case KVM_RISCV_ISA_EXT_SVADU:
+ /*
+ * The henvcfg.ADUE is read-only zero if menvcfg.ADUE is zero.
+ * Guest OS can use Svadu only when host os enable Svadu.
+ */
+ return arch_has_hw_pte_young();
default:
break;
}
@@ -167,6 +176,12 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
/* Extensions which can be disabled using Smstateen */
case KVM_RISCV_ISA_EXT_SSAIA:
return riscv_has_extension_unlikely(RISCV_ISA_EXT_SMSTATEEN);
+ case KVM_RISCV_ISA_EXT_SVADE:
+ /*
+ * The henvcfg.ADUE is read-only zero if menvcfg.ADUE is zero.
+ * Svade is not allowed to disable when the platform use Svade.
+ */
+ return arch_has_hw_pte_young();
default:
break;
}
--
2.17.1
