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| author | Gleb Natapov <gleb@redhat.com> | 2012-07-25 15:49:42 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-07-26 12:21:29 +0300 |
| commit | 99245b507dc3b1b2815d6a6cb4e94a6b7018a24b (patch) | |
| tree | f19ed493922799d5c0d7244d5c6eb9ad13bcaba8 /arch/x86/kvm | |
| parent | f23b070e662ca55a8fdaaa28537af06cab664499 (diff) | |
| download | linux-99245b507dc3b1b2815d6a6cb4e94a6b7018a24b.tar.bz2 | |
KVM: x86 emulator: drop unneeded call to get_segment()
setup_syscalls_segments() calls get_segment() and than overwrites all
but one of the structure fields and this one should also be overwritten
anyway, so we can drop call to get_segment() and avoid a couple of vmreads
on vmx. Also drop zeroing ss/cs structures since most of the fields are
set anyway. Just set those that were not set explicitly.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/emulate.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 2c5d1e65d9d1..10f0136f50c1 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -2035,12 +2035,6 @@ static void setup_syscalls_segments(struct x86_emulate_ctxt *ctxt, struct desc_struct *cs, struct desc_struct *ss) { - u16 selector; - - memset(cs, 0, sizeof(struct desc_struct)); - ctxt->ops->get_segment(ctxt, &selector, cs, NULL, VCPU_SREG_CS); - memset(ss, 0, sizeof(struct desc_struct)); - cs->l = 0; /* will be adjusted later */ set_desc_base(cs, 0); /* flat segment */ cs->g = 1; /* 4kb granularity */ @@ -2050,6 +2044,7 @@ setup_syscalls_segments(struct x86_emulate_ctxt *ctxt, cs->dpl = 0; /* will be adjusted later */ cs->p = 1; cs->d = 1; + cs->avl = 0; set_desc_base(ss, 0); /* flat segment */ set_desc_limit(ss, 0xfffff); /* 4GB limit */ @@ -2059,6 +2054,8 @@ setup_syscalls_segments(struct x86_emulate_ctxt *ctxt, ss->d = 1; /* 32bit stack segment */ ss->dpl = 0; ss->p = 1; + ss->l = 0; + ss->avl = 0; } static bool vendor_intel(struct x86_emulate_ctxt *ctxt) |