linux-kernel - [RFC PATCH 4/7] KVM: arm64: Steply write protect page table by mask bit

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Date:   Mon, 25 May 2020 19:24:03 +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>,
        <wanghaibin.wang@...wei.com>, <zhengxiang9@...wei.com>,
        Keqian Zhu <zhukeqian1@...wei.com>
Subject: [RFC PATCH 4/7] KVM: arm64: Steply write protect page table by mask bit

During dirty log clear, page table entries are write protected
according to a mask. In the past we write protect all entries
corresponding to the mask from ffs to fls. Though there may be
zero bits between this range, we are holding the kvm mmu lock
so we won't write protect entries that we don't want to.

We are about to add support for hardware management of dirty state
to arm64, holding kvm mmu lock will be not enough. We should write
protect entries steply by mask bit.

Signed-off-by: Keqian Zhu <zhukeqian1@...wei.com>
---
 virt/kvm/arm/mmu.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index ff8df9702e04..779859b85d6d 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -1568,10 +1568,16 @@ static void kvm_mmu_write_protect_pt_masked(struct kvm *kvm,
 		gfn_t gfn_offset, unsigned long mask)
 {
 	phys_addr_t base_gfn = slot->base_gfn + gfn_offset;
-	phys_addr_t start = (base_gfn +  __ffs(mask)) << PAGE_SHIFT;
-	phys_addr_t end = (base_gfn + __fls(mask) + 1) << PAGE_SHIFT;
+	phys_addr_t start, end;
+	u32 i;
 
-	stage2_wp_range(kvm, start, end);
+	for (i = __ffs(mask); i <= __fls(mask); i++) {
+		if (test_bit(i, &mask)) {
+			start = (base_gfn + i) << PAGE_SHIFT;
+			end = (base_gfn + i + 1) << PAGE_SHIFT;
+			stage2_wp_range(kvm, start, end);
+		}
+	}
 }
 
 /*
-- 
2.19.1