search for: trap_syscall

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

...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) - movq $0,UREGS_rip(%rsp) /* null rip */ - movl $3,UREGS_cs(%rsp) /* ring 3 null cs */ movq VCPU_sysenter_addr(%rbx),%rax setne %cl leaq VCPU_trap...

...# RIP popq %r11 # CS - cmpw $FLAT_KERNEL_CS32,%r11 + cmpw $FLAT_USER_CS32,%r11 popq %r11 # RFLAGS popq %rsp # RSP je 1f @@ -127,6 +131,9 @@ ENTRY(syscall_enter) movl $TRAP_syscall,4(%rsp) SAVE_ALL GET_CURRENT(%rbx) + movq VCPU_domain(%rbx),%rcx + testb $1,DOMAIN_is_32bit_pv(%rcx) + jnz compat_syscall testb $TF_kernel_mode,VCPU_thread_flags(%rbx) jz switch_to_kernel @@ -224,6 +231,41 @@ bad_hypercall: m...

...s(struct vcpu *n if ( test_bit(_VGCF_failsafe_disables_events, &n->arch.guest_context.flags) ) - n->vcpu_info->evtchn_upcall_mask = 1; + vcpu_info(n, evtchn_upcall_mask) = 1; regs->entry_vector = TRAP_syscall; regs->_eflags &= 0xFFFCBEFFUL; @@ -595,11 +595,11 @@ static void load_segments(struct vcpu *n /* CS longword also contains full evtchn_upcall_mask. */ cs_and_mask = (unsigned long)regs->cs | - ((unsigned long)n->vcpu_info->evtchn_upc...

Hi, I''ve still have problems with ACPI(?) on Xen. After some system startup or resume CPU temperature goes high although all domUs (and dom0) are idle. On "good" system startup it is about 50-55C, on "bad" - above 67C (most time above 70C). I''ve noticed difference in C-states repored by Xen (attached files). On "bad" startups in addition suspend

Hey, It looks like one of the patches that went in Xen 4.1 blows up. This used to work over the weekend, so I can only surmise it is one the three patches. This is with a debug=y build (which has been working nicely for the last month or more). It looks like one of the patches that went in Xen 4.1 blows up. This used to work a day ago - that is c/s 23551 worked nicely. ----- Forwarded message