KVM ARM Archive on lore.kernel.org
 help / color / Atom feed
From: Keqian Zhu <zhukeqian1@huawei.com>
To: <linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<kvmarm@lists.cs.columbia.edu>, <kvm@vger.kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Sean Christopherson <sean.j.christopherson@intel.com>,
	Steven Price <steven.price@arm.com>,
	liangpeng10@huawei.com, Alexios Zavras <alexios.zavras@intel.com>,
	Mark Brown <broonie@kernel.org>, Marc Zyngier <maz@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Will Deacon <will@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH v2 1/8] KVM: arm64: Set DBM bit for writable PTEs
Date: Thu, 2 Jul 2020 21:55:49 +0800
Message-ID: <20200702135556.36896-2-zhukeqian1@huawei.com> (raw)
In-Reply-To: <20200702135556.36896-1-zhukeqian1@huawei.com>

DBM bit is used by MMU to differentiate a genuinely non-writable
page from a page that is only temporarily non-writable in order
to mark dirty.

Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Peng Liang <liangpeng10@huawei.com>
---
 arch/arm64/include/asm/kvm_mmu.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index b12bfc1f051a..2700442b0f75 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -169,6 +169,10 @@ void kvm_clear_hyp_idmap(void);
 static inline pte_t kvm_s2pte_mkwrite(pte_t pte)
 {
 	pte_val(pte) |= PTE_S2_RDWR;
+
+	if (IS_ENABLED(CONFIG_ARM64_HW_AFDBM))
+		pte_val(pte) |= PTE_DBM;
+
 	return pte;
 }
 
-- 
2.19.1

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

  reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-02 13:55 [PATCH v2 0/8] KVM: arm64: Support HW dirty log based on DBM Keqian Zhu
2020-07-02 13:55 ` Keqian Zhu [this message]
2020-07-02 13:55 ` [PATCH v2 2/8] KVM: arm64: Scan PTEs to sync dirty log Keqian Zhu
2020-07-02 13:55 ` [PATCH v2 3/8] KVM: arm64: Modify stage2 young mechanism to support hw DBM Keqian Zhu
2020-07-02 13:55 ` [PATCH v2 4/8] KVM: arm64: Save stage2 PTE dirty status if it is covered Keqian Zhu
2020-07-02 13:55 ` [PATCH v2 5/8] KVM: arm64: Steply write protect page table by mask bit Keqian Zhu
2020-07-02 13:55 ` [PATCH v2 6/8] KVM: arm64: Add KVM_CAP_ARM_HW_DIRTY_LOG capability Keqian Zhu
2020-07-06  1:08   ` zhukeqian
2020-07-02 13:55 ` [PATCH v2 7/8] KVM: arm64: Sync dirty log parallel Keqian Zhu
2020-07-02 13:55 ` [PATCH v2 8/8] KVM: Omit dirty log sync in log clear if initially all set Keqian Zhu
2020-07-06  1:28 ` [PATCH v2 0/8] KVM: arm64: Support HW dirty log based on DBM zhukeqian
2020-07-06  7:54   ` Marc Zyngier
2020-07-13  2:47     ` zhukeqian
2020-07-13 14:53       ` Marc Zyngier
2020-07-28  2:11         ` zhukeqian
2020-07-28  7:52           ` Marc Zyngier
2020-07-28  8:32             ` zhukeqian

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200702135556.36896-2-zhukeqian1@huawei.com \
    --to=zhukeqian1@huawei.com \
    --cc=akpm@linux-foundation.org \
    --cc=alexios.zavras@intel.com \
    --cc=broonie@kernel.org \
    --cc=catalin.marinas@arm.com \
    --cc=kvm@vger.kernel.org \
    --cc=kvmarm@lists.cs.columbia.edu \
    --cc=liangpeng10@huawei.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=maz@kernel.org \
    --cc=sean.j.christopherson@intel.com \
    --cc=steven.price@arm.com \
    --cc=tglx@linutronix.de \
    --cc=will@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

KVM ARM Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/kvmarm/0 kvmarm/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 kvmarm kvmarm/ https://lore.kernel.org/kvmarm \
		kvmarm@lists.cs.columbia.edu
	public-inbox-index kvmarm

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/edu.columbia.cs.lists.kvmarm


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git