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| author | Jan Kiszka | 2012-02-17 18:31:20 +0100 |
|---|---|---|
| committer | Avi Kivity | 2012-02-18 11:16:00 +0100 |
| commit | 1189aa519ca9d088e3cc6fb621c2690a20077495 (patch) | |
| tree | 34f6a568d2ccf5927b913963a50612c63c8407a6 /pc-bios/optionrom | |
| parent | kvmvapic: Introduce TPR access optimization for Windows guests (diff) | |
| download | qemu-1189aa519ca9d088e3cc6fb621c2690a20077495.tar.gz qemu-1189aa519ca9d088e3cc6fb621c2690a20077495.tar.xz qemu-1189aa519ca9d088e3cc6fb621c2690a20077495.zip | |
kvmvapic: Simplify mp/up_set_tpr
The CH registers is only written, never read. So we can remove these
operations and, in case of up_set_tpr, also the ECX push/pop.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'pc-bios/optionrom')
| -rw-r--r-- | pc-bios/optionrom/kvmvapic.S | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/pc-bios/optionrom/kvmvapic.S b/pc-bios/optionrom/kvmvapic.S index e1d8f1825b..856c1e519d 100644 --- a/pc-bios/optionrom/kvmvapic.S +++ b/pc-bios/optionrom/kvmvapic.S @@ -202,7 +202,6 @@ mp_isr_is_bigger: mov %bh, %bl mp_tpr_is_bigger: /* %bl = ppr */ - mov %bl, %ch /* ch = ppr */ rol $8, %ebx /* now: %bl = irr, %bh = ppr */ cmp %bh, %bl @@ -276,7 +275,6 @@ up_set_tpr_eax: up_set_tpr: pushf push %eax - push %ecx push %ebx reenable_vtpr @@ -284,7 +282,7 @@ up_set_tpr_failed: mov vapic, %eax ; fixup mov %eax, %ebx - mov 20(%esp), %bl + mov 16(%esp), %bl /* %ebx = new vapic (%bl = tpr, %bh = isr, %b3 = irr) */ @@ -298,7 +296,6 @@ up_isr_is_bigger: mov %bh, %bl up_tpr_is_bigger: /* %bl = ppr */ - mov %bl, %ch /* ch = ppr */ rol $8, %ebx /* now: %bl = irr, %bh = ppr */ cmp %bh, %bl @@ -306,7 +303,6 @@ up_tpr_is_bigger: up_set_tpr_out: pop %ebx - pop %ecx pop %eax popf ret $4 |