Sean Christopherson e1548088ff KVM: VMX: Drop support for forcing UC memory when guest CR0.CD=1 ... Drop KVM's emulation of CR0.CD=1 on Intel CPUs now that KVM no longer honors guest MTRR memtypes, as forcing UC memory for VMs with non-coherent DMA only makes sense if the guest is using something other than PAT to configure the memtype for the DMA region. Furthermore, KVM has forced WB memory for CR0.CD=1 since commit fb279950ba ("KVM: vmx: obey KVM_QUIRK_CD_NW_CLEARED"), and no known VMM in existence disables KVM_X86_QUIRK_CD_NW_CLEARED, let alone does so with non-coherent DMA. Lastly, commit fb279950ba ("KVM: vmx: obey KVM_QUIRK_CD_NW_CLEARED") was from the same author as commit b18d5431ac ("KVM: x86: fix CR0.CD virtualization"), and followed by a mere month. I.e. forcing UC memory was likely the result of code inspection or perhaps misdiagnosed failures, and not the necessitate by a concrete use case. Update KVM's documentation to note that KVM_X86_QUIRK_CD_NW_CLEARED is now AMD-only, and to take an erratum for lack of CR0.CD virtualization on Intel. Tested-by: Xiangfei Ma <xiangfeix.ma@intel.com> Tested-by: Yongwei Ma <yongwei.ma@intel.com> Link: https://lore.kernel.org/r/20240309010929.1403984-3-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>		2024-06-05 08:13:14 -07:00
..
acrn	docs: acrn: Introduce ACRN	2021-02-09 10:58:18 +01:00
coco	Documentation: virt: Fix up pre-formatted text block for SEV ioctls	2024-02-02 17:21:22 +01:00
hyperv	Documentation: hyperv: Add overview of PCI pass-thru device support	2024-03-01 08:29:49 +00:00
kvm	KVM: VMX: Drop support for forcing UC memory when guest CR0.CD=1	2024-06-05 08:13:14 -07:00
uml	Documentation: Fix typos	2023-08-18 11:29:03 -06:00
guest-halt-polling.rst	Documentation: virt: correct location of haltpoll module params	2023-06-16 08:17:21 -06:00
index.rst	Docs/subsystem-apis: Remove '[The ]Linux' prefixes from titles of listed documents	2023-01-24 15:27:08 -07:00
ne_overview.rst	nitro_enclaves: Update documentation for Arm64 support	2021-09-14 11:11:20 +02:00
paravirt_ops.rst	Documentation: virt: Clean up paravirt_ops doc	2023-06-19 12:09:54 +02:00