linux-kernel - [PATCH 12/12] KVM: arm64: Enable stage2 hardware DBM

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Date:   Tue, 16 Jun 2020 17:35:53 +0800
From:   Keqian Zhu <zhukeqian1@...wei.com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>, <kvm@...r.kernel.org>
CC:     Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Will Deacon <will@...nel.org>,
        "Suzuki K Poulose" <suzuki.poulose@....com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Mark Brown <broonie@...nel.org>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexios Zavras <alexios.zavras@...el.com>,
        <liangpeng10@...wei.com>, <zhengxiang9@...wei.com>,
        <wanghaibin.wang@...wei.com>, Keqian Zhu <zhukeqian1@...wei.com>
Subject: [PATCH 12/12] KVM: arm64: Enable stage2 hardware DBM

We are ready to support hw management of dirty state, enable it if
hardware support it.

Signed-off-by: Keqian Zhu <zhukeqian1@...wei.com>
Signed-off-by: Peng Liang <liangpeng10@...wei.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 463175f80341..b22bd903284d 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -744,6 +744,8 @@
 #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 52bb801c9b2c..c1215b13bdd5 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -427,7 +427,7 @@ int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type)
 {
 	u64 vtcr = VTCR_EL2_FLAGS, mmfr0;
 	u32 parange, phys_shift;
-	u8 lvls;
+	u8 lvls, hadbs;
 
 	if (type & ~KVM_VM_TYPE_ARM_IPA_SIZE_MASK)
 		return -EINVAL;
@@ -465,6 +465,13 @@ int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type)
 	 */
 	vtcr |= VTCR_EL2_HA;
 
+#ifdef CONFIG_ARM64_HW_AFDBM
+	hadbs = (read_sysreg(id_aa64mmfr1_el1) >>
+			ID_AA64MMFR1_HADBS_SHIFT) & 0xf;
+	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