linux-kernel - [PATCH 01/12] KVM: arm64: Add some basic functions to support hw DBM

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Message-ID: <20200616093553.27512-2-zhukeqian1@huawei.com>
Date:   Tue, 16 Jun 2020 17:35:42 +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 01/12] KVM: arm64: Add some basic functions to support hw DBM

Prepare some basic functions to support hardware DBM for PTEs.

Signed-off-by: Keqian Zhu <zhukeqian1@...wei.com>
Signed-off-by: Peng Liang <liangpeng10@...wei.com>
---
 arch/arm64/include/asm/kvm_mmu.h | 36 ++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index b12bfc1f051a..e0ee6e23d626 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -265,6 +265,42 @@ static inline bool kvm_s2pud_young(pud_t pud)
 	return pud_young(pud);
 }
 
+#ifdef CONFIG_ARM64_HW_AFDBM
+static inline bool kvm_hw_dbm_enabled(void)
+{
+	return !!(read_sysreg(vtcr_el2) & VTCR_EL2_HD);
+}
+
+static inline void kvm_set_s2pte_dbm(pte_t *ptep)
+{
+	pteval_t old_pteval, pteval;
+
+	pteval = READ_ONCE(pte_val(*ptep));
+	do {
+		old_pteval = pteval;
+		pteval |= PTE_DBM;
+		pteval = cmpxchg_relaxed(&pte_val(*ptep), old_pteval, pteval);
+	} while (pteval != old_pteval);
+}
+
+static inline void kvm_clear_s2pte_dbm(pte_t *ptep)
+{
+	pteval_t old_pteval, pteval;
+
+	pteval = READ_ONCE(pte_val(*ptep));
+	do {
+		old_pteval = pteval;
+		pteval &= ~PTE_DBM;
+		pteval = cmpxchg_relaxed(&pte_val(*ptep), old_pteval, pteval);
+	} while (pteval != old_pteval);
+}
+
+static inline bool kvm_s2pte_dbm(pte_t *ptep)
+{
+	return !!(READ_ONCE(pte_val(*ptep)) & PTE_DBM);
+}
+#endif /* CONFIG_ARM64_HW_AFDBM */
+
 #define hyp_pte_table_empty(ptep) kvm_page_empty(ptep)
 
 #ifdef __PAGETABLE_PMD_FOLDED
-- 
2.19.1