search for: sysenter_eflags_sav

...a second time, as the PUSHes above already can/do take care of putting in place the intended values. Signed-off-by: Jan Beulich <jbeulich@suse.com> --- a/xen/arch/x86/x86_64/entry.S +++ b/xen/arch/x86/x86_64/entry.S @@ -275,15 +275,13 @@ ENTRY(sysenter_entry) pushfq .globl sysenter_eflags_saved sysenter_eflags_saved: - pushq $0 - pushq $0 + pushq $3 /* ring 3 null cs */ + pushq $0 /* null rip */ pushq $0 movl $TRAP_syscall,4(%rsp) SAVE_ALL GET_CURRENT(%rbx) cmpb $0,VCPU_sysenter_disables_events(%rbx) - mo...

Hello, This series has been split into two patches, one for arm and one for x86. I figured that this was easier than doing it as a single combined patch, especially as the changes are functionally independent. x86 has been boot tested, but arm has not even been compile tested as I lack a suitable cross compiler. However, the changes are just text replacement, so I dont expect any issues. The

This set of patches converts the way frames gets created from using PUSHes/POPs to using MOVes, thus allowing (in certain cases) to avoid saving/restoring part of the register set. While the place where the (small) win from this comes from varies between CPUs, the net effect is a 1 to 2% reduction on a combined interruption entry and exit when the full state save can be avoided. 1: use MOV

...AP_HANDLER(overflow); DECLARE_TRAP_HANDLER(bounds); @@ -545,6 +546,9 @@ DECLARE_TRAP_HANDLER(alignment_check); DECLARE_TRAP_HANDLER(spurious_interrupt_bug); #undef DECLARE_TRAP_HANDLER +void trap_nop(void); +void enable_nmis(void); + void syscall_enter(void); void sysenter_entry(void); void sysenter_eflags_saved(void);