On 02/05/2018 11:26 PM, Jim Mattson wrote:
On Mon, Feb 5, 2018 at 10:48 AM KarimAllah Ahmed <karahmed@xxxxxxxxx> wrote:
@@ -5264,9 +5264,8 @@ static void
vmx_complete_nested_posted_interrupt(struct kvm_vcpu *vcpu)
max_irr = find_last_bit((unsigned long
*)vmx->nested.pi_desc->pir, 256);
if (max_irr != 256) {
- vapic_page = kmap(vmx->nested.virtual_apic_page);
+ vapic_page = vmx->nested.virtual_apic_mapping.kaddr;
__kvm_apic_update_irr(vmx->nested.pi_desc->pir,
vapic_page);
- kunmap(vmx->nested.virtual_apic_page);
Your kernel mapping now survives exits to userspace. I didn't think that
was kosher, but I'd be happy to hear that I'm wrong.
Can you elaborate a bit? I do not really understand what is the concern.
@@ -7502,10 +7501,8 @@ static void free_nested(struct vcpu_vmx *vmx)
/* Unpin physical memory we referred to in the vmcs02 */
if (vmx->nested.apic_access_mapping.pfn)
kvm_release_host_mapping(&vmx->nested.apic_access_mapping, true);
- if (vmx->nested.virtual_apic_page) {
- kvm_release_page_dirty(vmx->nested.virtual_apic_page);
- vmx->nested.virtual_apic_page = NULL;
- }
+ if (vmx->nested.virtual_apic_mapping.pfn)
+
kvm_release_host_mapping(&vmx->nested.virtual_apic_mapping, true);
Is the host PFN guaranteed to be non-zero?
Yeah, I should not have assumed that PFN zero is invalid. Will fix.
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