linux-kernel - [RFC KVM 10/27] kvm/isolation: add KVM page table entry free functions

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Date:   Mon, 13 May 2019 16:38:18 +0200
From:   Alexandre Chartre <alexandre.chartre@...cle.com>
To:     pbonzini@...hat.com, rkrcmar@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        kvm@...r.kernel.org, x86@...nel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     konrad.wilk@...cle.com, jan.setjeeilers@...cle.com,
        liran.alon@...cle.com, jwadams@...gle.com,
        alexandre.chartre@...cle.com
Subject: [RFC KVM 10/27] kvm/isolation: add KVM page table entry free functions

These functions are wrappers around the p4d/pud/pmd/pte free function
which can be used with any pointer in the directory.

Signed-off-by: Alexandre Chartre <alexandre.chartre@...cle.com>
---
 arch/x86/kvm/isolation.c |   26 ++++++++++++++++++++++++++
 1 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/isolation.c b/arch/x86/kvm/isolation.c
index 1efdab1..61df750 100644
--- a/arch/x86/kvm/isolation.c
+++ b/arch/x86/kvm/isolation.c
@@ -161,6 +161,32 @@ static bool kvm_valid_pgt_entry(void *ptr)
 
 }
 
+/*
+ * kvm_pXX_free() functions are equivalent to kernel pXX_free()
+ * functions but they can be used with any PXX pointer in the
+ * directory.
+ */
+
+static inline void kvm_pte_free(struct mm_struct *mm, pte_t *pte)
+{
+	pte_free_kernel(mm, PGTD_ALIGN(pte));
+}
+
+static inline void kvm_pmd_free(struct mm_struct *mm, pmd_t *pmd)
+{
+	pmd_free(mm, PGTD_ALIGN(pmd));
+}
+
+static inline void kvm_pud_free(struct mm_struct *mm, pud_t *pud)
+{
+	pud_free(mm, PGTD_ALIGN(pud));
+}
+
+static inline void kvm_p4d_free(struct mm_struct *mm, p4d_t *p4d)
+{
+	p4d_free(mm, PGTD_ALIGN(p4d));
+}
+
 
 static int kvm_isolation_init_mm(void)
 {
-- 
1.7.1