On Fri, May 07, 2010 at 04:25:36PM +0800, Lai Jiangshan wrote:
> Subject: [PATCH] kvm, tdp: calculate correct base gfn for non-DIR level
>
> the base gfn calculation is incorrect in __direct_map(),
> it does not calculate correctly when level=3 or 4.
>
> Signed-off-by: Lai Jiangshan <la...@cn.fujitsu.com>
> Reported-by: Marcelo Tosatti <mtosa...@redhat.com>
> ---
> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
> index a5c6719..6986a6f 100644
> --- a/arch/x86/kvm/mmu.c
> +++ b/arch/x86/kvm/mmu.c
> @@ -1955,7 +1956,10 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t
> v, int write,
> }
>
> if (*iterator.sptep == shadow_trap_nonpresent_pte) {
> - pseudo_gfn = (iterator.addr & PT64_DIR_BASE_ADDR_MASK)
> >> PAGE_SHIFT;
> + u64 base_addr = iterator.addr;
> +
> + base_addr &= PT64_LVL_ADDR_MASK(iterator.level);
> + pseudo_gfn = base_addr >> PAGE_SHIFT;
> sp = kvm_mmu_get_page(vcpu, pseudo_gfn, iterator.addr,
> iterator.level - 1,
> 1, ACC_ALL, iterator.sptep);
Looks good, please resend the whole patch.
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