diff options
| author |   Lai Jiangshan <jiangshan.ljs@antgroup.com> | 2022-05-03 11:21:07 +0800 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2022-05-03 12:26:08 +0200 |
| commit | c89191ce67efa4e5353db6a67f7287c28e673740 (patch) | |
| tree | 92cbd5285a14625245da988335910c09f974db39 /arch/x86/entry | |
| parent | x86/entry: Don't call error_entry() for XENPV (diff) | |
| download | linux-dev-c89191ce67efa4e5353db6a67f7287c28e673740.tar.xz linux-dev-c89191ce67efa4e5353db6a67f7287c28e673740.zip | |
x86/entry: Convert SWAPGS to swapgs and remove the definition of SWAPGS
XENPV doesn't use swapgs_restore_regs_and_return_to_usermode(),
error_entry() and the code between entry_SYSENTER_compat() and
entry_SYSENTER_compat_after_hwframe.
Change the PV-compatible SWAPGS to the ASM instruction swapgs in these
places.
Also remove the definition of SWAPGS since no more users.
Signed-off-by: Lai Jiangshan <jiangshan.ljs@antgroup.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20220503032107.680190-7-jiangshanlai@gmail.com
Diffstat (limited to 'arch/x86/entry')
| -rw-r--r-- | arch/x86/entry/entry_64.S | 6 | ||||
| -rw-r--r-- | arch/x86/entry/entry_64_compat.S | 2 |
2 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 062aa9d95961..312186612f4e 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -1019,7 +1019,7 @@ SYM_CODE_START_LOCAL(error_entry) * We entered from user mode or we're pretending to have entered * from user mode due to an IRET fault. */ - SWAPGS + swapgs FENCE_SWAPGS_USER_ENTRY /* We have user CR3. Change to kernel CR3. */ SWITCH_TO_KERNEL_CR3 scratch_reg=%rax @@ -1051,7 +1051,7 @@ SYM_CODE_START_LOCAL(error_entry) * gsbase and proceed. We'll fix up the exception and land in * .Lgs_change's error handler with kernel gsbase. */ - SWAPGS + swapgs /* * Issue an LFENCE to prevent GS speculation, regardless of whether it is a @@ -1072,7 +1072,7 @@ SYM_CODE_START_LOCAL(error_entry) * We came from an IRET to user mode, so we have user * gsbase and CR3. Switch to kernel gsbase and CR3: */ - SWAPGS + swapgs FENCE_SWAPGS_USER_ENTRY SWITCH_TO_KERNEL_CR3 scratch_reg=%rax diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S index 4fdb007cddbd..c5aeb0819707 100644 --- a/arch/x86/entry/entry_64_compat.S +++ b/arch/x86/entry/entry_64_compat.S @@ -50,7 +50,7 @@ SYM_CODE_START(entry_SYSENTER_compat) UNWIND_HINT_EMPTY ENDBR /* Interrupts are off on entry. */ - SWAPGS + swapgs pushq %rax SWITCH_TO_KERNEL_CR3 scratch_reg=%rax |