It's kernel policy to not have (unannotated) indirect jumps because of
Spectre v2. This one's probably harmless, but better safe than sorry.
Convert it to a retpoline.
Cc: Boris Ostrovsky <boris.ostrov...@oracle.com>
Cc: Juergen Gross <jgr...@suse.com>
Signed-off-by: Josh Poimboeuf <jpoim...@redhat.com>
---
arch/x86/platform/pvh/head.S | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/platform/pvh/head.S b/arch/x86/platform/pvh/head.S
index 43b4d864817e..d87cebd08d32 100644
--- a/arch/x86/platform/pvh/head.S
+++ b/arch/x86/platform/pvh/head.S
@@ -16,6 +16,7 @@
#include <asm/boot.h>
#include <asm/processor-flags.h>
#include <asm/msr.h>
+#include <asm/nospec-branch.h>
#include <xen/interface/elfnote.h>
__HEAD
@@ -105,7 +106,7 @@ SYM_CODE_START_LOCAL(pvh_start_xen)
/* startup_64 expects boot_params in %rsi. */
mov $_pa(pvh_bootparams), %rsi
mov $_pa(startup_64), %rax
- jmp *%rax
+ JMP_NOSPEC rax
#else /* CONFIG_X86_64 */
--
2.29.2
