x86/bugs: Use VM_CLEAR_CPU_BUFFERS in VMX as well

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TSA mitigation:

  d8010d4ba4 ("x86/bugs: Add a Transient Scheduler Attacks mitigation")

introduced VM_CLEAR_CPU_BUFFERS for guests on AMD CPUs. Currently on Intel
CLEAR_CPU_BUFFERS is being used for guests which has a much broader scope
(kernel->user also).

Make mitigations on Intel consistent with TSA. This would help handling the
guest-only mitigations better in future.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
[sean: make CLEAR_CPU_BUF_VM mutually exclusive with the MMIO mitigation]
Acked-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Brendan Jackman <jackmanb@google.com>
Link: https://patch.msgid.link/20251113233746.1703361-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

...

This commit is contained in:

Pawan Gupta 2025-11-13 15:37:39 -08:00 • committed by Sean Christopherson

parent 844afc1af3

commit aba7de6088

2 changed files with 10 additions and 5 deletions

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13

arch/x86/kernel/cpu/bugs.c

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2

arch/x86/kvm/vmx/vmenter.S

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