From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: KarimAllah Ahmed <karahmed@amazon.de>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
pbonzini@redhat.com, rkrcmar@redhat.com
Subject: Re: [PATCH v5 02/13] X86/nVMX: Update the PML table without mapping and unmapping the page
Date: Wed, 23 Jan 2019 12:17:44 -0500 [thread overview]
Message-ID: <20190123171730.GG19289@Konrads-MacBook-Pro.local> (raw)
In-Reply-To: <1547026933-31226-3-git-send-email-karahmed@amazon.de>
On Wed, Jan 09, 2019 at 10:42:02AM +0100, KarimAllah Ahmed wrote:
> Update the PML table without mapping and unmapping the page. This also
> avoids using kvm_vcpu_gpa_to_page(..) which assumes that there is a "struct
> page" for guest memory.
>
> As a side-effect of using kvm_write_guest_page the page is also properly
> marked as dirty.
>
> Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
> Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> ---
> v1 -> v2:
> - Use kvm_write_guest_page instead of kvm_write_guest (pbonzini)
> - Do not use pointer arithmetic for pml_address (pbonzini)
> ---
> arch/x86/kvm/vmx/vmx.c | 14 +++++---------
> 1 file changed, 5 insertions(+), 9 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index 4d39f73..71d88df 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -7199,9 +7199,7 @@ static int vmx_write_pml_buffer(struct kvm_vcpu *vcpu)
> {
> struct vmcs12 *vmcs12;
> struct vcpu_vmx *vmx = to_vmx(vcpu);
> - gpa_t gpa;
> - struct page *page = NULL;
> - u64 *pml_address;
> + gpa_t gpa, dst;
>
> if (is_guest_mode(vcpu)) {
> WARN_ON_ONCE(vmx->nested.pml_full);
> @@ -7221,15 +7219,13 @@ static int vmx_write_pml_buffer(struct kvm_vcpu *vcpu)
> }
>
> gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS) & ~0xFFFull;
> + dst = vmcs12->pml_address + sizeof(u64) * vmcs12->guest_pml_index;
>
> - page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->pml_address);
> - if (is_error_page(page))
> + if (kvm_write_guest_page(vcpu->kvm, gpa_to_gfn(dst), &gpa,
> + offset_in_page(dst), sizeof(gpa)))
> return 0;
>
> - pml_address = kmap(page);
> - pml_address[vmcs12->guest_pml_index--] = gpa;
> - kunmap(page);
> - kvm_release_page_clean(page);
> + vmcs12->guest_pml_index--;
> }
>
> return 0;
> --
> 2.7.4
>
next prev parent reply other threads:[~2019-01-23 17:18 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-09 9:42 [PATCH v5 00/13] KVM/X86: Introduce a new guest mapping interface KarimAllah Ahmed
2019-01-09 9:42 ` [PATCH v5 01/13] X86/nVMX: handle_vmon: Read 4 bytes from guest memory KarimAllah Ahmed
2019-01-23 16:59 ` Konrad Rzeszutek Wilk
2019-01-09 9:42 ` [PATCH v5 02/13] X86/nVMX: Update the PML table without mapping and unmapping the page KarimAllah Ahmed
2019-01-23 17:17 ` Konrad Rzeszutek Wilk [this message]
2019-01-09 9:42 ` [PATCH v5 03/13] X86/KVM: Handle PFNs outside of kernel reach when touching GPTEs KarimAllah Ahmed
2019-01-23 17:31 ` Konrad Rzeszutek Wilk
2019-01-09 9:42 ` [PATCH v5 04/13] KVM: Introduce a new guest mapping API KarimAllah Ahmed
2019-01-10 13:07 ` David Hildenbrand
2019-01-25 18:01 ` Raslan, KarimAllah
2019-01-23 17:41 ` Konrad Rzeszutek Wilk
2019-01-23 17:50 ` Konrad Rzeszutek Wilk
2019-01-25 18:09 ` Raslan, KarimAllah
2019-01-30 17:08 ` Paolo Bonzini
2019-01-09 9:42 ` [PATCH v5 05/13] X86/nVMX: handle_vmptrld: Use kvm_vcpu_map when copying VMCS12 from guest memory KarimAllah Ahmed
2019-01-23 17:44 ` Konrad Rzeszutek Wilk
2019-01-09 9:42 ` [PATCH v5 06/13] KVM/nVMX: Use kvm_vcpu_map when mapping the L1 MSR bitmap KarimAllah Ahmed
2019-01-09 9:42 ` [PATCH v5 07/13] KVM/nVMX: Use kvm_vcpu_map when mapping the virtual APIC page KarimAllah Ahmed
2019-01-23 17:57 ` Konrad Rzeszutek Wilk
2019-01-25 18:14 ` Raslan, KarimAllah
2019-01-09 9:42 ` [PATCH v5 08/13] KVM/nVMX: Use kvm_vcpu_map when mapping the posted interrupt descriptor table KarimAllah Ahmed
2019-01-23 18:03 ` Konrad Rzeszutek Wilk
2019-01-25 18:15 ` Raslan, KarimAllah
2019-01-09 9:42 ` [PATCH v5 09/13] KVM/X86: Use kvm_vcpu_map in emulator_cmpxchg_emulated KarimAllah Ahmed
2019-01-23 18:04 ` Konrad Rzeszutek Wilk
2019-01-09 9:42 ` [PATCH v5 10/13] KVM/nSVM: Use the new mapping API for mapping guest memory KarimAllah Ahmed
2019-01-23 18:08 ` Konrad Rzeszutek Wilk
2019-01-09 9:42 ` [PATCH v5 11/13] KVM/nVMX: Use kvm_vcpu_map for accessing the shadow VMCS KarimAllah Ahmed
2019-01-23 18:10 ` Konrad Rzeszutek Wilk
2019-01-09 9:42 ` [PATCH v5 12/13] KVM/nVMX: Use kvm_vcpu_map for accessing the enlightened VMCS KarimAllah Ahmed
2019-01-23 18:11 ` Konrad Rzeszutek Wilk
2019-01-09 9:42 ` [PATCH v5 13/13] KVM/nVMX: Use page_address_valid in a few more locations KarimAllah Ahmed
2019-01-23 18:18 ` Konrad Rzeszutek Wilk
2019-01-25 18:17 ` Raslan, KarimAllah
2019-01-23 18:16 ` [PATCH v5 00/13] KVM/X86: Introduce a new guest mapping interface Konrad Rzeszutek Wilk
2019-01-25 18:28 ` Raslan, KarimAllah
2019-01-30 17:14 ` Paolo Bonzini
2019-01-31 13:03 ` Raslan, KarimAllah
2019-01-31 13:10 ` Paolo Bonzini
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