linux-kernel - Re: [PATCH v5 13/13] KVM/nVMX: Use page_address

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Date:   Fri, 25 Jan 2019 18:17:12 +0000
From:   "Raslan, KarimAllah" <karahmed@...zon.de>
To:     "konrad.wilk@...cle.com" <konrad.wilk@...cle.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>
Subject: Re: [PATCH v5 13/13] KVM/nVMX: Use page_address_valid in a few more
 locations

On Wed, 2019-01-23 at 13:18 -0500, Konrad Rzeszutek Wilk wrote:
> On Wed, Jan 09, 2019 at 10:42:13AM +0100, KarimAllah Ahmed wrote:
> > 
> > Use page_address_valid in a few more locations that is already checking for
> > a page aligned address that does not cross the maximum physical address.
> 
> Where is this page_address_valid declared? The latest linus's tree does
> not have it, nor does your patchset?

It is already defined in the code, I can not see any commits that removed it:

$ git grep page_address_valid
arch/x86/kvm/vmx/nested.c:static bool page_address_valid(struct kvm_vcpu *vcpu,
gpa_t gpa)
arch/x86/kvm/vmx/nested.c:      if (!page_address_valid(vcpu, vmcs12-
>io_bitmap_a) ||
arch/x86/kvm/vmx/nested.c:          !page_address_valid(vcpu, vmcs12->io_bitmap_
b))
arch/x86/kvm/vmx/nested.c:      if (!page_address_valid(vcpu, vmcs12-
>msr_bitmap))
arch/x86/kvm/vmx/nested.c:      if (!page_address_valid(vcpu, vmcs12-
>virtual_apic_page_addr))
arch/x86/kvm/vmx/nested.c:          !page_address_valid(vcpu, vmcs12-
>apic_access_addr))
arch/x86/kvm/vmx/nested.c:          !page_address_valid(vcpu, vmcs12-
>pml_address))
arch/x86/kvm/vmx/nested.c:      if (!page_address_valid(vcpu, vmcs12-
>vmread_bitmap) ||
arch/x86/kvm/vmx/nested.c:          !page_address_valid(vcpu, vmcs12-
>vmwrite_bitmap))
arch/x86/kvm/vmx/nested.c:                          !page_address_valid(vcpu,
vmcs12->eptp_list_address))
arch/x86/kvm/vmx/nested.c:      if (!page_address_valid(vcpu, vmcs12-
>vmcs_link_pointer))
arch/x86/kvm/vmx/nested.c:      if (!page_address_valid(vcpu, kvm_state-
>vmx.vmxon_pa))
arch/x86/kvm/vmx/nested.c:                  !page_address_valid(vcpu, kvm_state-
>vmx.vmcs_pa))

> > 
> > 
> > Signed-off-by: KarimAllah Ahmed <karahmed@...zon.de>
> > ---
> >  arch/x86/kvm/vmx/nested.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> > index ccb3b63..77aad46 100644
> > --- a/arch/x86/kvm/vmx/nested.c
> > +++ b/arch/x86/kvm/vmx/nested.c
> > @@ -4203,7 +4203,7 @@ static int handle_vmon(struct kvm_vcpu *vcpu)
> >  	 * Note - IA32_VMX_BASIC[48] will never be 1 for the nested case;
> >  	 * which replaces physical address width with 32
> >  	 */
> > -	if (!PAGE_ALIGNED(vmptr) || (vmptr >> cpuid_maxphyaddr(vcpu)))
> > +	if (!page_address_valid(vcpu, vmptr))
> >  		return nested_vmx_failInvalid(vcpu);
> >  
> >  	if (kvm_read_guest(vcpu->kvm, vmptr, &revision, sizeof(revision)) ||
> > @@ -4266,7 +4266,7 @@ static int handle_vmclear(struct kvm_vcpu *vcpu)
> >  	if (nested_vmx_get_vmptr(vcpu, &vmptr))
> >  		return 1;
> >  
> > -	if (!PAGE_ALIGNED(vmptr) || (vmptr >> cpuid_maxphyaddr(vcpu)))
> > +	if (!page_address_valid(vcpu, vmptr))
> >  		return nested_vmx_failValid(vcpu,
> >  			VMXERR_VMCLEAR_INVALID_ADDRESS);
> >  
> > @@ -4473,7 +4473,7 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
> >  	if (nested_vmx_get_vmptr(vcpu, &vmptr))
> >  		return 1;
> >  
> > -	if (!PAGE_ALIGNED(vmptr) || (vmptr >> cpuid_maxphyaddr(vcpu)))
> > +	if (!page_address_valid(vcpu, vmptr))
> >  		return nested_vmx_failValid(vcpu,
> >  			VMXERR_VMPTRLD_INVALID_ADDRESS);
> >  
> > -- 
> > 2.7.4
> > 



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