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* [RFC PATCH 0/3] KVM: x86: honor guest memory type
@ 2020-02-13 21:30 Chia-I Wu
  2020-02-13 21:30 ` [RFC PATCH 1/3] KVM: vmx: rewrite the comment in vmx_get_mt_mask Chia-I Wu
                   ` (3 more replies)
  0 siblings, 4 replies; 32+ messages in thread
From: Chia-I Wu @ 2020-02-13 21:30 UTC (permalink / raw)
  To: kvm
  Cc: wanpengli, joro, dri-devel, gurchetansingh, kraxel, pbonzini,
	vkuznets, jmattson

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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^ permalink raw reply	[flat|nested] 32+ messages in thread

end of thread, other threads:[~2020-02-25  1:29 UTC | newest]

Thread overview: 32+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-02-13 21:30 [RFC PATCH 0/3] KVM: x86: honor guest memory type Chia-I Wu
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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