On 06/28/2010 12:31 PM, Gleb Natapov wrote:
On Mon, Jun 28, 2010 at 12:27:22PM +0300, Avi Kivity wrote:
nOn 06/28/2010 11:42 AM, Sheng Yang wrote:
Some guest device driver may leverage the "Non-Snoop" I/O, and explicitly
WBINVD or CLFLUSH to a RAM space. Since migration may occur before WBINVD or
CLFLUSH, we need to maintain data consistency either by:
1: flushing cache (wbinvd) when the guest is scheduled out if there is no
wbinvd exit, or
2: execute wbinvd on all dirty physical CPUs when guest wbinvd exits.
+int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu)
+{
+ if (need_emulate_wbinvd(vcpu)&& kvm_x86_ops->has_wbinvd_exit()) {
+ smp_call_function_many(vcpu->arch.wbinvd_dirty_mask,
+ wbinvd_ipi, NULL, 1);
+ cpumask_clear(vcpu->arch.wbinvd_dirty_mask);
+ } else
+ wbinvd();
+ return X86EMUL_CONTINUE;
+}
+EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd);
Why check for has_wbinvd_exit()? If it's false, we don't get here anyway.
If !need_emulate_wbinvd(), why call wbinvd()?
The function is called from emulator too. I guess that is why.
Ah, yes. But it needs to return, if !n_e_wbinvd(), not call wbinvd().
--
error compiling committee.c: too many arguments to function
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