x86/speculation, KVM: Implement support for VIRT_SPEC_CTRL/LS_CFG

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commit 47c61b3955 upstream

Add the necessary logic for supporting the emulated VIRT_SPEC_CTRL MSR to
x86_virt_spec_ctrl().  If either X86_FEATURE_LS_CFG_SSBD or
X86_FEATURE_VIRT_SPEC_CTRL is set then use the new guest_virt_spec_ctrl
argument to check whether the state must be modified on the host. The
update reuses speculative_store_bypass_update() so the ZEN-specific sibling
coordination can be reused.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Thomas Gleixner 2018-05-10 20:42:48 +02:00 • committed by Greg Kroah-Hartman

parent 71179d5dcb

commit 3f44c1a3c2

2 changed files with 36 additions and 0 deletions

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6

arch/x86/include/asm/spec-ctrl.h

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30

arch/x86/kernel/cpu/bugs.c

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