From: "Raslan, KarimAllah" <karahmed@amazon.de>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"rkrcmar@redhat.com" <rkrcmar@redhat.com>,
"pbonzini@redhat.com" <pbonzini@redhat.com>
Subject: Re: [PATCH v3 07/13] KVM/nVMX: Use kvm_vcpu_map when mapping the virtual APIC page
Date: Sun, 21 Oct 2018 08:09:19 +0000 [thread overview]
Message-ID: <1540109359.11839.30.camel@amazon.de> (raw)
In-Reply-To: <1540074145-31285-8-git-send-email-karahmed@amazon.de>
Sorry! please ignore this patch in favor of its RESEND. I realized that a few
lines from it leaked into another patch series. The "RESEND" should have this
fixed.
On Sun, 2018-10-21 at 00:22 +0200, KarimAllah Ahmed wrote:
> Use kvm_vcpu_map when mapping the virtual APIC page since using
> kvm_vcpu_gpa_to_page() and kmap() will only work for guest memory that has
> a "struct page".
>
> One additional semantic change is that the virtual host mapping lifecycle
> has changed a bit. It now has the same lifetime of the pinning of the
> virtual APIC page on the host side.
>
> Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
> ---
> v1 -> v2:
> - Do not change the lifecycle of the mapping (pbonzini)
> - Use pfn_to_hpa instead of gfn_to_gpa
> ---
> arch/x86/kvm/vmx.c | 34 +++++++++++-----------------------
> 1 file changed, 11 insertions(+), 23 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 5b15ca2..83a5e95 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -845,9 +845,8 @@ struct nested_vmx {
> * pointers, so we must keep them pinned while L2 runs.
> */
> struct page *apic_access_page;
> - struct page *virtual_apic_page;
> + struct kvm_host_map virtual_apic_map;
> struct page *pi_desc_page;
> -
> struct kvm_host_map msr_bitmap_map;
>
> struct pi_desc *pi_desc;
> @@ -6152,11 +6151,12 @@ 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_map.hva;
> + if (!vapic_page)
> + return;
> +
> __kvm_apic_update_irr(vmx->nested.pi_desc->pir,
> vapic_page, &max_irr);
> - kunmap(vmx->nested.virtual_apic_page);
> -
> status = vmcs_read16(GUEST_INTR_STATUS);
> if ((u8)max_irr > ((u8)status & 0xff)) {
> status &= ~0xff;
> @@ -8468,10 +8468,7 @@ static void free_nested(struct vcpu_vmx *vmx)
> kvm_release_page_dirty(vmx->nested.apic_access_page);
> vmx->nested.apic_access_page = NULL;
> }
> - if (vmx->nested.virtual_apic_page) {
> - kvm_release_page_dirty(vmx->nested.virtual_apic_page);
> - vmx->nested.virtual_apic_page = NULL;
> - }
> + kvm_vcpu_unmap(&vmx->nested.virtual_apic_map);
> if (vmx->nested.pi_desc_page) {
> kunmap(vmx->nested.pi_desc_page);
> kvm_release_page_dirty(vmx->nested.pi_desc_page);
> @@ -11394,6 +11391,7 @@ static void nested_get_vmcs12_pages(struct kvm_vcpu *vcpu)
> {
> struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
> struct vcpu_vmx *vmx = to_vmx(vcpu);
> + struct kvm_host_map *map;
> struct page *page;
> u64 hpa;
>
> @@ -11426,11 +11424,7 @@ static void nested_get_vmcs12_pages(struct kvm_vcpu *vcpu)
> }
>
> if (nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW)) {
> - if (vmx->nested.virtual_apic_page) { /* shouldn't happen */
> - kvm_release_page_dirty(vmx->nested.virtual_apic_page);
> - vmx->nested.virtual_apic_page = NULL;
> - }
> - page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->virtual_apic_page_addr);
> + map = &vmx->nested.virtual_apic_map;
>
> /*
> * If translation failed, VM entry will fail because
> @@ -11445,11 +11439,8 @@ static void nested_get_vmcs12_pages(struct kvm_vcpu *vcpu)
> * control. But such a configuration is useless, so
> * let's keep the code simple.
> */
> - if (!is_error_page(page)) {
> - vmx->nested.virtual_apic_page = page;
> - hpa = page_to_phys(vmx->nested.virtual_apic_page);
> - vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, hpa);
> - }
> + if (!kvm_vcpu_map(vcpu, gpa_to_gfn(vmcs12->virtual_apic_page_addr), map))
> + vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, pfn_to_hpa(map->pfn));
> }
>
> if (nested_cpu_has_posted_intr(vmcs12)) {
> @@ -13353,10 +13344,7 @@ static void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason,
> kvm_release_page_dirty(vmx->nested.apic_access_page);
> vmx->nested.apic_access_page = NULL;
> }
> - if (vmx->nested.virtual_apic_page) {
> - kvm_release_page_dirty(vmx->nested.virtual_apic_page);
> - vmx->nested.virtual_apic_page = NULL;
> - }
> + kvm_vcpu_unmap(&vmx->nested.virtual_apic_map);
> if (vmx->nested.pi_desc_page) {
> kunmap(vmx->nested.pi_desc_page);
> kvm_release_page_dirty(vmx->nested.pi_desc_page);
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next prev parent reply other threads:[~2018-10-21 8:09 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-20 22:22 [PATCH v3 00/13] KVM/X86: Introduce a new guest mapping interface KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 01/13] X86/nVMX: handle_vmon: Read 4 bytes from guest memory KarimAllah Ahmed
2018-10-22 17:17 ` Jim Mattson
2018-10-20 22:22 ` [PATCH v3 02/13] X86/nVMX: handle_vmptrld: Copy the VMCS12 directly " KarimAllah Ahmed
2018-10-22 21:32 ` Jim Mattson
2018-10-20 22:22 ` [PATCH v3 03/13] X86/nVMX: Update the PML table without mapping and unmapping the page KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 04/13] X86/KVM: Handle PFNs outside of kernel reach when touching GPTEs KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 05/13] KVM: Introduce a new guest mapping API KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 06/13] KVM/nVMX: Use kvm_vcpu_map when mapping the L1 MSR bitmap KarimAllah Ahmed
2018-10-22 21:42 ` Jim Mattson
2018-10-22 21:49 ` Raslan, KarimAllah
2018-10-20 22:22 ` [PATCH v3 07/13] KVM/nVMX: Use kvm_vcpu_map when mapping the virtual APIC page KarimAllah Ahmed
2018-10-21 7:39 ` [RESEND PATCH " KarimAllah Ahmed
2018-10-21 8:09 ` Raslan, KarimAllah [this message]
2018-10-20 22:22 ` [PATCH v3 08/13] KVM/nVMX: Use kvm_vcpu_map when mapping the posted interrupt descriptor table KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 09/13] KVM/X86: Use kvm_vcpu_map in emulator_cmpxchg_emulated KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 10/13] KVM/X86: hyperv: Use kvm_vcpu_map in synic_clear_sint_msg_pending KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 11/13] KVM/X86: hyperv: Use kvm_vcpu_map in synic_deliver_msg KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 12/13] KVM/nSVM: Use the new mapping API for mapping guest memory KarimAllah Ahmed
2018-10-20 22:22 ` [PATCH v3 13/13] KVM/nVMX: Use kvm_vcpu_map for accessing the shadow VMCS KarimAllah Ahmed
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