From: Chia-I Wu <olvaffe@gmail.com>
To: kvm@vger.kernel.org
Cc: wanpengli@tencent.com, joro@8bytes.org,
dri-devel@lists.freedesktop.org, gurchetansingh@chromium.org,
kraxel@redhat.com, pbonzini@redhat.com, vkuznets@redhat.com,
jmattson@google.com
Subject: [RFC PATCH 0/3] KVM: x86: honor guest memory type
Date: Thu, 13 Feb 2020 13:30:33 -0800 [thread overview]
Message-ID: <20200213213036.207625-1-olvaffe@gmail.com> (raw)
Hi,
Host GPU drivers like to give userspace WC mapping. When the userspace makes
the mapping available to a guest, it also tells the guest to create a WC
mapping. However, even when the guest kernel picks the correct memory type,
it gets ignored because of VMX_EPT_IPAT_BIT on Intel.
This series adds a new flag to KVM_SET_USER_MEMORY_REGION, which tells the
host kernel to honor the guest memory type for the memslot. An alternative
fix is for KVM to unconditionally honor the guest memory type (unless it is
MMIO, to avoid MCEs on Intel). I believe the alternative fix is how things
are on ARM, and probably also how things are on AMD.
I am new to KVM and HW virtualization technologies. This series is meant as
an RFC.
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next reply other threads:[~2020-02-13 21:30 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-13 21:30 Chia-I Wu [this message]
2020-02-13 21:30 ` [RFC PATCH 1/3] KVM: vmx: rewrite the comment in vmx_get_mt_mask Chia-I Wu
2020-02-14 9:36 ` Paolo Bonzini
2020-02-13 21:30 ` [RFC PATCH 2/3] RFC: KVM: add KVM_MEM_DMA Chia-I Wu
2020-02-13 21:30 ` [RFC PATCH 3/3] RFC: KVM: x86: support KVM_CAP_DMA_MEM Chia-I Wu
2020-02-13 21:41 ` [RFC PATCH 0/3] KVM: x86: honor guest memory type Paolo Bonzini
2020-02-13 22:18 ` Chia-I Wu
2020-02-14 10:26 ` Paolo Bonzini
2020-02-14 19:52 ` Sean Christopherson
2020-02-14 21:47 ` Chia-I Wu
2020-02-14 21:56 ` Jim Mattson
2020-02-14 22:03 ` Sean Christopherson
2020-02-18 16:28 ` Paolo Bonzini
2020-02-18 22:58 ` Sean Christopherson
2020-02-19 9:52 ` Tian, Kevin
2020-02-19 19:36 ` Chia-I Wu
2020-02-20 2:04 ` Tian, Kevin
2020-02-20 2:38 ` Tian, Kevin
2020-02-20 22:23 ` Chia-I Wu
2020-02-21 0:23 ` Tian, Kevin
2020-02-21 4:45 ` Chia-I Wu
2020-02-21 4:51 ` Chia-I Wu
2020-02-21 5:39 ` Tian, Kevin
2020-02-21 15:59 ` Sean Christopherson
2020-02-21 18:21 ` Chia-I Wu
2020-02-25 1:29 ` Tian, Kevin
2020-02-14 21:15 ` Chia-I Wu
2020-02-19 10:00 ` Tian, Kevin
2020-02-19 19:18 ` Chia-I Wu
2020-02-20 2:13 ` Tian, Kevin
2020-02-20 23:02 ` Chia-I Wu
2020-02-24 10:57 ` Gerd Hoffmann
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