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xen.20938
xsa377.patch
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File xsa377.patch of Package xen.20938
From: Andrew Cooper <andrew.cooper3@citrix.com> Subject: x86/spec-ctrl: Mitigate TAA after S3 resume The user chosen setting for MSR_TSX_CTRL needs restoring after S3. All APs get the correct setting via start_secondary(), but the BSP was missed out. This is XSA-377 / CVE-2021-28690. Fixes: 8c4330818f6 ("x86/spec-ctrl: Mitigate the TSX Asynchronous Abort sidechannel") Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> --- a/xen/arch/x86/acpi/power.c +++ b/xen/arch/x86/acpi/power.c @@ -255,6 +255,8 @@ static int enter_state(u32 state) microcode_resume_cpu(0); + tsx_init(); /* Needs microcode. May change HLE/RTM feature bits. */ + /* Re-enabled default NMI/#MC use of MSR_SPEC_CTRL. */ ci->spec_ctrl_flags |= (default_spec_ctrl_flags & SCF_ist_wrmsr); spec_ctrl_exit_idle(ci);
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