diff options
| author | Lai Jiangshan <[email protected]> | 2022-05-03 11:21:07 +0800 |
|---|---|---|
| committer | Borislav Petkov <[email protected]> | 2022-05-03 12:26:08 +0200 |
| commit | c89191ce67efa4e5353db6a67f7287c28e673740 (patch) | |
| tree | 92cbd5285a14625245da988335910c09f974db39 | |
| parent | 64cbd0acb58203fb769ed2f4eab526d43e243847 (diff) | |
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 <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Reviewed-by: Juergen Gross <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
| -rw-r--r-- | arch/x86/entry/entry_64.S | 6 | ||||
| -rw-r--r-- | arch/x86/entry/entry_64_compat.S | 2 | ||||
| -rw-r--r-- | arch/x86/include/asm/irqflags.h | 8 |
3 files changed, 4 insertions, 12 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 diff --git a/arch/x86/include/asm/irqflags.h b/arch/x86/include/asm/irqflags.h index 111104d1c2cd..7793e52d6237 100644 --- a/arch/x86/include/asm/irqflags.h +++ b/arch/x86/include/asm/irqflags.h @@ -137,14 +137,6 @@ static __always_inline void arch_local_irq_restore(unsigned long flags) if (!arch_irqs_disabled_flags(flags)) arch_local_irq_enable(); } -#else -#ifdef CONFIG_X86_64 -#ifdef CONFIG_XEN_PV -#define SWAPGS ALTERNATIVE "swapgs", "", X86_FEATURE_XENPV -#else -#define SWAPGS swapgs -#endif -#endif #endif /* !__ASSEMBLY__ */ #endif |