From: Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
To: Paul Knowles <paul-1LojSYAwM1QXQ3Lr6voeyA@public.gmane.org>
Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: [PATCH] Fix to kvm_arch_vcpu_ioctl_set_sregs so that set_cr0 works properly
Date: Thu, 7 Feb 2008 11:32:43 +0100 [thread overview]
Message-ID: <20080207103243.GI12094@8bytes.org> (raw)
In-Reply-To: <E1C3584C-9A8E-4F97-9C7A-DA709B8A85CB-1LojSYAwM1QXQ3Lr6voeyA@public.gmane.org>
On Thu, Feb 07, 2008 at 08:55:59AM +0000, Paul Knowles wrote:
> Hi Joerg
>
> The problem is this block of code in set_cr0
>
> #ifdef CONFIG_X86_64
> if (vcpu->arch.shadow_efer & EFER_LME) {
> if (!is_paging(vcpu) && (cr0 & X86_CR0_PG))
> enter_lmode(vcpu);
> if (is_paging(vcpu) && !(cr0 & X86_CR0_PG))
> exit_lmode(vcpu);
> }
> #endif
Hmm, the stuff that is done in enter_lmode() is also done in
vmx_set_efer() (except for the TSS fixup). I am still pretty sure it
should work without your fix (also because it will likely break SVM with
Nested Paging). Have you set EFER.LME *and* EFER.LMA when you called
set_sregs?
Joerg
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next prev parent reply other threads:[~2008-02-07 10:32 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-06 11:02 [PATCH] Fix to kvm_arch_vcpu_ioctl_set_sregs so that set_cr0 works properly Paul Knowles
[not found] ` <1DF02D2D-98D0-4695-A4A5-724A12616142-1LojSYAwM1QXQ3Lr6voeyA@public.gmane.org>
2008-02-06 20:21 ` Joerg Roedel
[not found] ` <20080206202142.GB6344-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2008-02-07 8:55 ` Paul Knowles
[not found] ` <E1C3584C-9A8E-4F97-9C7A-DA709B8A85CB-1LojSYAwM1QXQ3Lr6voeyA@public.gmane.org>
2008-02-07 10:32 ` Joerg Roedel [this message]
2008-02-11 8:11 ` Avi Kivity
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