[PATCH 5.4 001/215] Documentation/hw-vuln: Update spectre doc

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5.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lin Yujun <linyujun809@xxxxxxxxxx>

commit 06cb31cc761823ef444ba4e1df11347342a6e745 upstream.

commit 7c693f54c873691 ("x86/speculation: Add spectre_v2=ibrs option to support Kernel IBRS")

adds the "ibrs " option  in
Documentation/admin-guide/kernel-parameters.txt but omits it to
Documentation/admin-guide/hw-vuln/spectre.rst, add it.

Signed-off-by: Lin Yujun <linyujun809@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220830123614.23007-1-linyujun809@xxxxxxxxxx
Signed-off-by: Jonathan Corbet <corbet@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 Documentation/admin-guide/hw-vuln/spectre.rst |    1 +
 1 file changed, 1 insertion(+)

--- a/Documentation/admin-guide/hw-vuln/spectre.rst
+++ b/Documentation/admin-guide/hw-vuln/spectre.rst
@@ -625,6 +625,7 @@ kernel command line.
                 eibrs                   enhanced IBRS
                 eibrs,retpoline         enhanced IBRS + Retpolines
                 eibrs,lfence            enhanced IBRS + LFENCE
+                ibrs                    use IBRS to protect kernel
 
 		Not specifying this option is equivalent to
 		spectre_v2=auto.






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