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| author |   Josh Poimboeuf <jpoimboe@kernel.org> | 2022-06-14 23:16:13 +0200 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2022-06-27 10:34:00 +0200 |
| commit | fc02735b14fff8c6678b521d324ade27b1a3d4cf (patch) | |
| tree | 9be32b1a805858cab02c043a740b2bab8f45a15c /arch/x86/include | |
| parent | KVM: VMX: Convert launched argument to flags (diff) | |
| download | linux-dev-fc02735b14fff8c6678b521d324ade27b1a3d4cf.tar.xz linux-dev-fc02735b14fff8c6678b521d324ade27b1a3d4cf.zip | |
KVM: VMX: Prevent guest RSB poisoning attacks with eIBRS
On eIBRS systems, the returns in the vmexit return path from
__vmx_vcpu_run() to vmx_vcpu_run() are exposed to RSB poisoning attacks.
Fix that by moving the post-vmexit spec_ctrl handling to immediately
after the vmexit.
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/nospec-branch.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h index dee9ef77af13..ccde87e6eabb 100644 --- a/arch/x86/include/asm/nospec-branch.h +++ b/arch/x86/include/asm/nospec-branch.h @@ -274,6 +274,7 @@ static inline void indirect_branch_prediction_barrier(void) /* The Intel SPEC CTRL MSR base value cache */ extern u64 x86_spec_ctrl_base; +extern u64 x86_spec_ctrl_current; extern void write_spec_ctrl_current(u64 val, bool force); extern u64 spec_ctrl_current(void); |