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CONFIG_PARAVIRT_XXL is mainly defined/used by XEN PV guests. For
other VM guest types, features supported under CONFIG_PARAVIRT
are self sufficient. CONFIG_PARAVIRT mainly provides support for
TLB flush operations and time related operations.
For TDX guest as well, paravirt calls under CONFIG_PARVIRT meets
most of its requirement except the need of HLT and SAFE_HLT
paravirt calls, which is currently defined under
CONFIG_PARAVIRT_XXL.
Since enabling CONFIG_PARAVIRT_XXL is too bloated for TDX guest
like platforms, move HLT and SAFE_HLT paravirt calls under
CONFIG_PARAVIRT.
Moving HLT and SAFE_HLT paravirt calls are not fatal and should not
break any functionality for current users of CONFIG_PARAVIRT.
Fixes: bfe6ed0c67 ("x86/tdx: Add HLT support for TDX guests")
Co-developed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Vishal Annapurve <vannapurve@google.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Tested-by: Ryan Afranji <afranji@google.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: stable@kernel.org
Link: https://lore.kernel.org/r/20250228014416.3925664-2-vannapurve@google.com
164 lines
3.1 KiB
C
164 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _X86_IRQFLAGS_H_
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#define _X86_IRQFLAGS_H_
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#include <asm/processor-flags.h>
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#ifndef __ASSEMBLER__
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#include <asm/nospec-branch.h>
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/*
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* Interrupt control:
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*/
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/* Declaration required for gcc < 4.9 to prevent -Werror=missing-prototypes */
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extern inline unsigned long native_save_fl(void);
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extern __always_inline unsigned long native_save_fl(void)
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{
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unsigned long flags;
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/*
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* "=rm" is safe here, because "pop" adjusts the stack before
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* it evaluates its effective address -- this is part of the
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* documented behavior of the "pop" instruction.
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*/
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asm volatile("# __raw_save_flags\n\t"
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"pushf ; pop %0"
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: "=rm" (flags)
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: /* no input */
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: "memory");
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return flags;
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}
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static __always_inline void native_irq_disable(void)
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{
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asm volatile("cli": : :"memory");
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}
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static __always_inline void native_irq_enable(void)
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{
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asm volatile("sti": : :"memory");
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}
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static __always_inline void native_safe_halt(void)
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{
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mds_idle_clear_cpu_buffers();
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asm volatile("sti; hlt": : :"memory");
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}
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static __always_inline void native_halt(void)
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{
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mds_idle_clear_cpu_buffers();
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asm volatile("hlt": : :"memory");
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}
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static __always_inline int native_irqs_disabled_flags(unsigned long flags)
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{
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return !(flags & X86_EFLAGS_IF);
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}
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static __always_inline unsigned long native_local_irq_save(void)
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{
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unsigned long flags = native_save_fl();
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native_irq_disable();
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return flags;
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}
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static __always_inline void native_local_irq_restore(unsigned long flags)
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{
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if (!native_irqs_disabled_flags(flags))
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native_irq_enable();
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}
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#endif
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#ifndef CONFIG_PARAVIRT
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#ifndef __ASSEMBLY__
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/*
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* Used in the idle loop; sti takes one instruction cycle
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* to complete:
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*/
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static __always_inline void arch_safe_halt(void)
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{
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native_safe_halt();
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}
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/*
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* Used when interrupts are already enabled or to
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* shutdown the processor:
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*/
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static __always_inline void halt(void)
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{
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native_halt();
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}
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_PARAVIRT */
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#ifdef CONFIG_PARAVIRT_XXL
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#include <asm/paravirt.h>
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#else
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#ifndef __ASSEMBLER__
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#include <linux/types.h>
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static __always_inline unsigned long arch_local_save_flags(void)
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{
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return native_save_fl();
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}
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static __always_inline void arch_local_irq_disable(void)
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{
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native_irq_disable();
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}
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static __always_inline void arch_local_irq_enable(void)
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{
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native_irq_enable();
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}
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/*
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* For spinlocks, etc:
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*/
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static __always_inline unsigned long arch_local_irq_save(void)
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{
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unsigned long flags = arch_local_save_flags();
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arch_local_irq_disable();
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return flags;
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}
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#else
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#ifdef CONFIG_X86_64
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#ifdef CONFIG_DEBUG_ENTRY
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#define SAVE_FLAGS pushfq; popq %rax
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#endif
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#endif
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#endif /* __ASSEMBLER__ */
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#endif /* CONFIG_PARAVIRT_XXL */
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#ifndef __ASSEMBLER__
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static __always_inline int arch_irqs_disabled_flags(unsigned long flags)
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{
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return !(flags & X86_EFLAGS_IF);
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}
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static __always_inline int arch_irqs_disabled(void)
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{
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unsigned long flags = arch_local_save_flags();
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return arch_irqs_disabled_flags(flags);
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}
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static __always_inline void arch_local_irq_restore(unsigned long flags)
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{
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if (!arch_irqs_disabled_flags(flags))
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arch_local_irq_enable();
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}
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#endif /* !__ASSEMBLER__ */
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#endif
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