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Juergen Gross d1a6d0a963 x86/entry: Fix entry_INT80_compat for Xen PV guests 
commit 5b9f0c4df1 upstream.

Commit

  c89191ce67 ("x86/entry: Convert SWAPGS to swapgs and remove the definition of SWAPGS")

missed one use case of SWAPGS in entry_INT80_compat(). Removing of
the SWAPGS macro led to asm just using "swapgs", as it is accepting
instructions in capital letters, too.

This in turn leads to splats in Xen PV guests like:

  [   36.145223] general protection fault, maybe for address 0x2d: 0000 [#1] PREEMPT SMP NOPTI
  [   36.145794] CPU: 2 PID: 1847 Comm: ld-linux.so.2 Not tainted 5.19.1-1-default #1 \
	  openSUSE Tumbleweed f3b44bfb672cdb9f235aff53b57724eba8b9411b
  [   36.146608] Hardware name: HP ProLiant ML350p Gen8, BIOS P72 11/14/2013
  [   36.148126] RIP: e030:entry_INT80_compat+0x3/0xa3

Fix that by open coding this single instance of the SWAPGS macro.

Fixes: c89191ce67 ("x86/entry: Convert SWAPGS to swapgs and remove the definition of SWAPGS")
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Cc: <stable@vger.kernel.org> # 5.19
Link: https://lore.kernel.org/r/20220816071137.4893-1-jgross@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2022-08-31 17:18:13 +02:00
..
syscalls Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
vdso x86: link vdso and boot with -z noexecstack --no-warn-rwx-segments 2022-08-17 15:13:39 +02:00
vsyscall x86/vsyscall_emu/64: Don't use RET in vsyscall emulation 2022-06-27 10:33:58 +02:00
Makefile x86/entry: Build thunk_$(BITS) only if CONFIG_PREEMPTION=y 2022-08-17 15:16:02 +02:00
calling.h x86/retbleed: Add fine grained Kconfig knobs 2022-06-29 17:43:41 +02:00
common.c X86 entry code related updates: 2021-06-29 12:44:51 -07:00
entry.S x86/bugs: Add retbleed=ibpb 2022-06-27 10:34:00 +02:00
entry_32.S x86/speculation: Fix RSB filling with CONFIG_RETPOLINE=n 2022-06-27 10:34:00 +02:00
entry_64.S x86/entry: Remove UNTRAIN_RET from native_irq_return_ldt 2022-07-14 09:45:12 +02:00
entry_64_compat.S x86/entry: Fix entry_INT80_compat for Xen PV guests 2022-08-31 17:18:13 +02:00
syscall_32.c x86/syscalls: Stop filling syscall arrays with *_sys_ni_syscall 2021-05-20 15:03:59 +02:00
syscall_64.c x86/syscalls: Stop filling syscall arrays with *_sys_ni_syscall 2021-05-20 15:03:59 +02:00
syscall_x32.c x86/syscalls: Stop filling syscall arrays with *_sys_ni_syscall 2021-05-20 15:03:59 +02:00
thunk_32.S x86/entry: Build thunk_$(BITS) only if CONFIG_PREEMPTION=y 2022-08-17 15:16:02 +02:00
thunk_64.S x86/entry: Build thunk_$(BITS) only if CONFIG_PREEMPTION=y 2022-08-17 15:16:02 +02:00