diff options
| author | Jes Sorensen <jes@sgi.com> | 2009-02-25 10:38:55 -0600 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-06-10 11:48:29 +0300 |
| commit | 0b5d7a2ccb98f0403b1969295429724af9dc9d8e (patch) | |
| tree | 56108639641d6634df4a1de4e3ef4d4b9589a26b /arch/ia64/kvm/optvfault.S | |
| parent | ce17c643738bebcacf8d19d8cab7dd3eb96f9f32 (diff) | |
KVM: ia64: Drop in SN2 replacement of fast path ITC emulation fault handler
Copy in SN2 RTC based ITC emulation for fast exit. The two versions
have the same size, so a dropin is simpler than patching the branch
instruction to hit the SN2 version.
Signed-off-by: Jes Sorensen <jes@sgi.com>
Acked-by: Xiantao Zhang <xiantao.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/ia64/kvm/optvfault.S')
| -rw-r--r-- | arch/ia64/kvm/optvfault.S | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/ia64/kvm/optvfault.S b/arch/ia64/kvm/optvfault.S index 32254ce9a1bd..f793be3effff 100644 --- a/arch/ia64/kvm/optvfault.S +++ b/arch/ia64/kvm/optvfault.S @@ -11,6 +11,7 @@ #include <asm/asmmacro.h> #include <asm/processor.h> +#include <asm/kvm_host.h> #include "vti.h" #include "asm-offsets.h" @@ -140,6 +141,35 @@ GLOBAL_ENTRY(kvm_asm_mov_from_ar) ;; END(kvm_asm_mov_from_ar) +/* + * Special SGI SN2 optimized version of mov_from_ar using the SN2 RTC + * clock as it's source for emulating the ITC. This version will be + * copied on top of the original version if the host is determined to + * be an SN2. + */ +GLOBAL_ENTRY(kvm_asm_mov_from_ar_sn2) + add r18=VMM_VCPU_ITC_OFS_OFFSET, r21 + movl r19 = (KVM_VMM_BASE+(1<<KVM_VMM_SHIFT)) + + add r16=VMM_VCPU_LAST_ITC_OFFSET,r21 + extr.u r17=r25,6,7 + mov r24=b0 + ;; + ld8 r18=[r18] + ld8 r19=[r19] + addl r20=@gprel(asm_mov_to_reg),gp + ;; + add r19=r19,r18 + shladd r17=r17,4,r20 + ;; + adds r30=kvm_resume_to_guest-asm_mov_to_reg,r20 + st8 [r16] = r19 + mov b0=r17 + br.sptk.few b0 + ;; +END(kvm_asm_mov_from_ar_sn2) + + // mov r1=rr[r3] GLOBAL_ENTRY(kvm_asm_mov_from_rr) |