It is bad form to have inter-function fallthrough.  It only functions right
now because alignment padding bytes are NOPs.

However, it also interferes with livepatching binary diffs, because the
implicit grouping of the two functions isn't expressed in the ELF metadata.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Jan Beulich <JBeulich@suse.com>
CC: Roger Pau Monné <roger.pau@citrix.com>
CC: Wei Liu <wl@xen.org>
CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
CC: Ross Lagerwall <ross.lagerwall@citrix.com>
---
 xen/arch/x86/x86_64/entry.S | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/arch/x86/x86_64/entry.S b/xen/arch/x86/x86_64/entry.S
index c3f6b667a72a..fc64ef1fd460 100644
--- a/xen/arch/x86/x86_64/entry.S
+++ b/xen/arch/x86/x86_64/entry.S
@@ -723,7 +723,9 @@ END(common_interrupt)
 FUNC(entry_PF)
         ENDBR64
         movl  $X86_EXC_PF, 4(%rsp)
+        jmp   handle_exception
 END(entry_PF)
+
 /* No special register assumptions. */
 FUNC(handle_exception, 0)
         ALTERNATIVE "", clac, X86_FEATURE_XEN_SMAP
@@ -1023,6 +1025,7 @@ FUNC(entry_NMI)
         ENDBR64
         pushq $0
         movl  $X86_EXC_NMI, 4(%rsp)
+        jmp   handle_ist_exception
 END(entry_NMI)
 
 FUNC(handle_ist_exception)
-- 
2.30.2

On 22/01/2024 6:17 pm, Andrew Cooper wrote:
> It is bad form to have inter-function fallthrough.  It only functions right
> now because alignment padding bytes are NOPs.
>
> However, it also interferes with livepatching binary diffs, because the
> implicit grouping of the two functions isn't expressed in the ELF metadata.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>

Please disregard this, and look at the other patch 2.

~Andrew