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| author | Gleb Natapov <gleb@redhat.com> | 2010-04-28 19:15:29 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2010-08-01 10:35:31 +0300 |
| commit | 5951c4423724759906b10a26aa6a8817c4afa615 (patch) | |
| tree | 552b885e950cf61e841534cbefd0231f9ad0992d /arch/x86/kvm/x86.c | |
| parent | 3fb1b5dbd397d16a855c97c3fb80fe6e9196ce7c (diff) | |
| download | lwn-5951c4423724759906b10a26aa6a8817c4afa615.tar.gz lwn-5951c4423724759906b10a26aa6a8817c4afa615.zip | |
KVM: x86 emulator: add get_cached_segment_base() callback to x86_emulate_ops
On VMX it is expensive to call get_cached_descriptor() just to get segment
base since multiple vmcs_reads are done instead of only one. Introduce
new call back get_cached_segment_base() for efficiency.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index e3a5455049b0..9a469df6011c 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3714,6 +3714,12 @@ static void emulator_get_gdt(struct desc_ptr *dt, struct kvm_vcpu *vcpu) kvm_x86_ops->get_gdt(vcpu, dt); } +static unsigned long emulator_get_cached_segment_base(int seg, + struct kvm_vcpu *vcpu) +{ + return get_segment_base(vcpu, seg); +} + static bool emulator_get_cached_descriptor(struct desc_struct *desc, int seg, struct kvm_vcpu *vcpu) { @@ -3804,6 +3810,7 @@ static struct x86_emulate_ops emulate_ops = { .set_cached_descriptor = emulator_set_cached_descriptor, .get_segment_selector = emulator_get_segment_selector, .set_segment_selector = emulator_set_segment_selector, + .get_cached_segment_base = emulator_get_cached_segment_base, .get_gdt = emulator_get_gdt, .get_cr = emulator_get_cr, .set_cr = emulator_set_cr, |