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Re: [Qemu-devel] [PATCH v6 05/16] target-i386: Use Hypervisor level in -
From: |
Marcelo Tosatti |
Subject: |
Re: [Qemu-devel] [PATCH v6 05/16] target-i386: Use Hypervisor level in -machine pc, accel=kvm. |
Date: |
Tue, 9 Oct 2012 15:27:26 -0300 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Tue, Oct 09, 2012 at 02:18:05PM -0300, Marcelo Tosatti wrote:
> On Mon, Sep 24, 2012 at 10:32:07AM -0400, Don Slutz wrote:
> > Also known as Paravirtualization level.
> >
> > This change is based on:
> >
> > Microsoft Hypervisor CPUID Leaves:
> >
> > http://msdn.microsoft.com/en-us/library/windows/hardware/ff542428%28v=vs.85%29.aspx
> >
> > Linux kernel change starts with:
> > http://fixunix.com/kernel/538707-use-cpuid-communicate-hypervisor.html
> > Also:
> > http://lkml.indiana.edu/hypermail/linux/kernel/1205.0/00100.html
> >
> > VMware documention on CPUIDs (Mechanisms to determine if software is
> > running in a VMware virtual machine):
> >
> > http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458
> >
> > QEMU knows this is KVM_CPUID_SIGNATURE (0x40000000).
> >
> > Signed-off-by: Don Slutz <address@hidden>
> > ---
> > target-i386/kvm.c | 4 ++--
> > 1 files changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/target-i386/kvm.c b/target-i386/kvm.c
> > index 895d848..8462c75 100644
> > --- a/target-i386/kvm.c
> > +++ b/target-i386/kvm.c
> > @@ -389,12 +389,12 @@ int kvm_arch_init_vcpu(CPUX86State *env)
> > c = &cpuid_data.entries[cpuid_i++];
> > memset(c, 0, sizeof(*c));
> > c->function = KVM_CPUID_SIGNATURE
> > - if (!hyperv_enabled()) {
> > + if (!env->cpuid_hv_level_set) {
> > memcpy(signature, "KVMKVMKVM\0\0\0", 12);
> > c->eax = 0;
> > } else {
> > memcpy(signature, "Microsoft Hv", 12);
> > - c->eax = HYPERV_CPUID_MIN;
> > + c->eax = env->cpuid_hv_level;
>
> This breaks hyperv_enabled() checks.
>
> Don, are you certain it is worthwhile to make this configurable?
> Can you explain why, under your scenario, it is worthwhile?
>
> Because these are separate problems:
>
> - "Fake" VMWare hypervisor (which seems to be your main goal).
> - Make CPUID HV leafs configurable via command line.
Err, meant via properties. Point is, why have VMWare CPUID
configuration as data, if there are reasons to believe code
is a better fit (code as in current Hyper-V implementation).
> My point is that the CPUIDs must be carefully constructed,
> that i miss the point why making them configurable is
> desired.
>
> --
> To unsubscribe from this list: send the line "unsubscribe kvm" in
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> More majordomo info at http://vger.kernel.org/majordomo-info.html
- Re: [Qemu-devel] [PATCH v6 05/16] target-i386: Use Hypervisor level in -machine pc, accel=kvm., Marcelo Tosatti, 2012/10/09
- Re: [Qemu-devel] [PATCH v6 05/16] target-i386: Use Hypervisor level in -machine pc, accel=kvm.,
Marcelo Tosatti <=
- Re: [Qemu-devel] [PATCH v6 05/16] target-i386: Use Hypervisor level in -machine pc, accel=kvm., Marcelo Tosatti, 2012/10/09
- Re: [Qemu-devel] [PATCH v6 05/16] target-i386: Use Hypervisor level in -machine pc, accel=kvm., Don Slutz, 2012/10/09
- Re: [Qemu-devel] [PATCH v6 05/16] target-i386: Use Hypervisor level in -machine pc, accel=kvm., Marcelo Tosatti, 2012/10/09
- Re: [Qemu-devel] [PATCH v6 05/16] target-i386: Use Hypervisor level in -machine pc, accel=kvm., Don Slutz, 2012/10/10
- Re: [Qemu-devel] [PATCH v6 05/16] target-i386: Use Hypervisor level in -machine pc, accel=kvm., Marcelo Tosatti, 2012/10/10