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Subject[RFC PATCH 7/7] KVM: arm64: Enable stage2 hardware DBM
Date
We are ready to support hw management of dirty state, enable it if
hardware support it.

Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Peng Liang <liangpeng10@huawei.com>
---
arch/arm64/include/asm/sysreg.h | 2 ++
arch/arm64/kvm/reset.c | 9 ++++++++-
2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index ebc622432831..371ea6d65c16 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -721,6 +721,8 @@
#define ID_AA64MMFR1_VMIDBITS_8 0
#define ID_AA64MMFR1_VMIDBITS_16 2

+#define ID_AA64MMFR1_HADBS_DBS 2
+
/* id_aa64mmfr2 */
#define ID_AA64MMFR2_E0PD_SHIFT 60
#define ID_AA64MMFR2_FWB_SHIFT 40
diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index 30b7ea680f66..cb727e1fb581 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -392,7 +392,7 @@ int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type)
{
u64 vtcr = VTCR_EL2_FLAGS;
u32 parange, phys_shift;
- u8 lvls;
+ u8 lvls, hadbs;

if (type & ~KVM_VM_TYPE_ARM_IPA_SIZE_MASK)
return -EINVAL;
@@ -428,6 +428,13 @@ int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type)
*/
vtcr |= VTCR_EL2_HA;

+ hadbs = (read_sysreg(id_aa64mmfr1_el1) >>
+ ID_AA64MMFR1_HADBS_SHIFT) & 0xf;
+#ifdef CONFIG_ARM64_HW_AFDBM
+ if (hadbs == ID_AA64MMFR1_HADBS_DBS)
+ vtcr |= VTCR_EL2_HD;
+#endif
+
/* Set the vmid bits */
vtcr |= (kvm_get_vmid_bits() == 16) ?
VTCR_EL2_VS_16BIT :
--
2.19.1
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