On 16.11.22 12:04, Peter Zijlstra wrote:
On Wed, Nov 09, 2022 at 02:44:18PM +0100, Juergen Gross wrote:There are some paravirt assembler functions which are sharing a common pattern. Introduce a macro DEFINE_PARAVIRT_ASM() for creating them. Note that this macro is including explicit alignment of the generated functions, leading to __raw_callee_save___kvm_vcpu_is_preempted(), _paravirt_nop() and paravirt_ret0() to be aligned at 4 byte boundaries now. The explicit _paravirt_nop() prototype in paravirt.c isn't needed, as it is included in paravirt_types.h already. Signed-off-by: Juergen Gross <jgross@xxxxxxxx> Reviewed-by: Srivatsa S. Bhat (VMware) <srivatsa@xxxxxxxxxxxxx> ---Seems nice; I've made the below little edits, but this is certainly a bit large for /urgent at this point in time. So how about I merge locking/urgent into x86/paravirt and munge this on top?
Fine with me. Thanks for looking at the patch, Juergen
--- --- a/arch/x86/include/asm/paravirt.h +++ b/arch/x86/include/asm/paravirt.h @@ -737,7 +737,7 @@ static __always_inline unsigned long arc __ALIGN_STR "\n" \ #func ":\n\t" \ ASM_ENDBR \ - instr \ + instr "\n\t" \ ASM_RET \ ".size " #func ", . - " #func "\n\t" \ ".popsection") --- a/arch/x86/include/asm/qspinlock_paravirt.h +++ b/arch/x86/include/asm/qspinlock_paravirt.h @@ -54,8 +54,8 @@ __PV_CALLEE_SAVE_REGS_THUNK(__pv_queued_ "pop %rdx\n\t" \ FRAME_END-DEFINE_PARAVIRT_ASM(__raw_callee_save___pv_queued_spin_unlock, PV_UNLOCK_ASM,- .spinlock.text); +DEFINE_PARAVIRT_ASM(__raw_callee_save___pv_queued_spin_unlock, + PV_UNLOCK_ASM, .spinlock.text);#else /* CONFIG_64BIT */ --- a/arch/x86/kernel/kvm.c+++ b/arch/x86/kernel/kvm.c @@ -802,6 +802,7 @@ extern bool __raw_callee_save___kvm_vcpu "movq __per_cpu_offset(,%rdi,8), %rax\n\t" \ "cmpb $0, " __stringify(KVM_STEAL_TIME_preempted) "+steal_time(%rax)\n\t" \ "setne %al\n\t" + DEFINE_PARAVIRT_ASM(__raw_callee_save___kvm_vcpu_is_preempted, PV_VCPU_PREEMPTED_ASM, .text); #endif --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -40,8 +40,7 @@ DEFINE_PARAVIRT_ASM(_paravirt_nop, "", .entry.text);/* stub always returning 0. */-#define PV_RET0_ASM "xor %" _ASM_AX ", %" _ASM_AX "\n\t" -DEFINE_PARAVIRT_ASM(paravirt_ret0, PV_RET0_ASM, .entry.text); +DEFINE_PARAVIRT_ASM(paravirt_ret0, "xor %eax,%eax", .entry.text);void __init default_banner(void){
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