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Message-ID: <pa4l62zp7wf77xdxoliuj2f7gliyan37fdcyl5tyblpknfu5iu@voe5mj6tz7vk>
Date: Fri, 2 Jan 2026 16:58:31 +0000
From: Yosry Ahmed <yosry.ahmed@...ux.dev>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>,
Oliver Upton <oupton@...nel.org>, Tianrui Zhao <zhaotianrui@...ngson.cn>,
Bibo Mao <maobibo@...ngson.cn>, Huacai Chen <chenhuacai@...nel.org>,
Anup Patel <anup@...infault.org>, Paul Walmsley <pjw@...nel.org>,
Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
Christian Borntraeger <borntraeger@...ux.ibm.com>, Janosch Frank <frankja@...ux.ibm.com>,
Claudio Imbrenda <imbrenda@...ux.ibm.com>, kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
kvmarm@...ts.linux.dev, loongarch@...ts.linux.dev, kvm-riscv@...ts.infradead.org,
linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 11/21] KVM: selftests: Stop passing VMX metadata to
TDP mapping functions
On Tue, Dec 30, 2025 at 03:01:40PM -0800, Sean Christopherson wrote:
> From: Yosry Ahmed <yosry.ahmed@...ux.dev>
>
> The root GPA can now be retrieved from the nested MMU, stop passing VMX
> metadata. This is in preparation for making these functions work for
> NPTs as well.
Super nit: I think at this point the root GPA is already being retrieved
from the nested MMU, so maybe s/can now be/is?
Also, maybe call it TDP MMU or stage2 MMU since it was renamed.
>
> Opportunistically drop tdp_pg_map() since it's unused.
>
> No functional change intended.
>
> Signed-off-by: Yosry Ahmed <yosry.ahmed@...ux.dev>
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
> tools/testing/selftests/kvm/include/x86/vmx.h | 11 ++-----
> .../testing/selftests/kvm/lib/x86/memstress.c | 11 +++----
> tools/testing/selftests/kvm/lib/x86/vmx.c | 33 +++++++------------
> .../selftests/kvm/x86/vmx_dirty_log_test.c | 9 +++--
> 4 files changed, 24 insertions(+), 40 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/include/x86/vmx.h b/tools/testing/selftests/kvm/include/x86/vmx.h
> index 1fd83c23529a..4dd4c2094ee6 100644
> --- a/tools/testing/selftests/kvm/include/x86/vmx.h
> +++ b/tools/testing/selftests/kvm/include/x86/vmx.h
> @@ -557,14 +557,9 @@ bool load_vmcs(struct vmx_pages *vmx);
>
> bool ept_1g_pages_supported(void);
>
> -void tdp_pg_map(struct vmx_pages *vmx, struct kvm_vm *vm, uint64_t nested_paddr,
> - uint64_t paddr);
> -void tdp_map(struct vmx_pages *vmx, struct kvm_vm *vm, uint64_t nested_paddr,
> - uint64_t paddr, uint64_t size);
> -void tdp_identity_map_default_memslots(struct vmx_pages *vmx,
> - struct kvm_vm *vm);
> -void tdp_identity_map_1g(struct vmx_pages *vmx, struct kvm_vm *vm,
> - uint64_t addr, uint64_t size);
> +void tdp_map(struct kvm_vm *vm, uint64_t nested_paddr, uint64_t paddr, uint64_t size);
> +void tdp_identity_map_default_memslots(struct kvm_vm *vm);
> +void tdp_identity_map_1g(struct kvm_vm *vm, uint64_t addr, uint64_t size);
> bool kvm_cpu_has_ept(void);
> void vm_enable_ept(struct kvm_vm *vm);
> void prepare_virtualize_apic_accesses(struct vmx_pages *vmx, struct kvm_vm *vm);
> diff --git a/tools/testing/selftests/kvm/lib/x86/memstress.c b/tools/testing/selftests/kvm/lib/x86/memstress.c
> index 00f7f11e5f0e..3319cb57a78d 100644
> --- a/tools/testing/selftests/kvm/lib/x86/memstress.c
> +++ b/tools/testing/selftests/kvm/lib/x86/memstress.c
> @@ -59,7 +59,7 @@ uint64_t memstress_nested_pages(int nr_vcpus)
> return 513 + 10 * nr_vcpus;
> }
>
> -static void memstress_setup_ept_mappings(struct vmx_pages *vmx, struct kvm_vm *vm)
> +static void memstress_setup_ept_mappings(struct kvm_vm *vm)
> {
> uint64_t start, end;
>
> @@ -68,16 +68,15 @@ static void memstress_setup_ept_mappings(struct vmx_pages *vmx, struct kvm_vm *v
> * KVM can shadow the EPT12 with the maximum huge page size supported
> * by the backing source.
> */
> - tdp_identity_map_1g(vmx, vm, 0, 0x100000000ULL);
> + tdp_identity_map_1g(vm, 0, 0x100000000ULL);
>
> start = align_down(memstress_args.gpa, PG_SIZE_1G);
> end = align_up(memstress_args.gpa + memstress_args.size, PG_SIZE_1G);
> - tdp_identity_map_1g(vmx, vm, start, end - start);
> + tdp_identity_map_1g(vm, start, end - start);
> }
>
> void memstress_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu *vcpus[])
> {
> - struct vmx_pages *vmx;
> struct kvm_regs regs;
> vm_vaddr_t vmx_gva;
> int vcpu_id;
> @@ -87,11 +86,11 @@ void memstress_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu *vc
>
> vm_enable_ept(vm);
> for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) {
> - vmx = vcpu_alloc_vmx(vm, &vmx_gva);
> + vcpu_alloc_vmx(vm, &vmx_gva);
>
> /* The EPTs are shared across vCPUs, setup the mappings once */
> if (vcpu_id == 0)
> - memstress_setup_ept_mappings(vmx, vm);
> + memstress_setup_ept_mappings(vm);
>
> /*
> * Override the vCPU to run memstress_l1_guest_code() which will
> diff --git a/tools/testing/selftests/kvm/lib/x86/vmx.c b/tools/testing/selftests/kvm/lib/x86/vmx.c
> index 9d4e391fdf2c..ea1c09f9e8ab 100644
> --- a/tools/testing/selftests/kvm/lib/x86/vmx.c
> +++ b/tools/testing/selftests/kvm/lib/x86/vmx.c
> @@ -409,8 +409,8 @@ static void tdp_create_pte(struct kvm_vm *vm,
> }
>
>
> -void __tdp_pg_map(struct vmx_pages *vmx, struct kvm_vm *vm,
> - uint64_t nested_paddr, uint64_t paddr, int target_level)
> +void __tdp_pg_map(struct kvm_vm *vm, uint64_t nested_paddr, uint64_t paddr,
> + int target_level)
> {
> const uint64_t page_size = PG_LEVEL_SIZE(target_level);
> void *eptp_hva = addr_gpa2hva(vm, vm->arch.tdp_mmu->pgd);
> @@ -453,12 +453,6 @@ void __tdp_pg_map(struct vmx_pages *vmx, struct kvm_vm *vm,
> }
> }
>
> -void tdp_pg_map(struct vmx_pages *vmx, struct kvm_vm *vm,
> - uint64_t nested_paddr, uint64_t paddr)
> -{
> - __tdp_pg_map(vmx, vm, nested_paddr, paddr, PG_LEVEL_4K);
> -}
> -
> /*
> * Map a range of EPT guest physical addresses to the VM's physical address
> *
> @@ -476,9 +470,8 @@ void tdp_pg_map(struct vmx_pages *vmx, struct kvm_vm *vm,
> * Within the VM given by vm, creates a nested guest translation for the
> * page range starting at nested_paddr to the page range starting at paddr.
> */
> -void __tdp_map(struct vmx_pages *vmx, struct kvm_vm *vm,
> - uint64_t nested_paddr, uint64_t paddr, uint64_t size,
> - int level)
> +void __tdp_map(struct kvm_vm *vm, uint64_t nested_paddr, uint64_t paddr,
> + uint64_t size, int level)
> {
> size_t page_size = PG_LEVEL_SIZE(level);
> size_t npages = size / page_size;
> @@ -487,23 +480,22 @@ void __tdp_map(struct vmx_pages *vmx, struct kvm_vm *vm,
> TEST_ASSERT(paddr + size > paddr, "Paddr overflow");
>
> while (npages--) {
> - __tdp_pg_map(vmx, vm, nested_paddr, paddr, level);
> + __tdp_pg_map(vm, nested_paddr, paddr, level);
> nested_paddr += page_size;
> paddr += page_size;
> }
> }
>
> -void tdp_map(struct vmx_pages *vmx, struct kvm_vm *vm,
> - uint64_t nested_paddr, uint64_t paddr, uint64_t size)
> +void tdp_map(struct kvm_vm *vm, uint64_t nested_paddr, uint64_t paddr,
> + uint64_t size)
> {
> - __tdp_map(vmx, vm, nested_paddr, paddr, size, PG_LEVEL_4K);
> + __tdp_map(vm, nested_paddr, paddr, size, PG_LEVEL_4K);
> }
>
> /* Prepare an identity extended page table that maps all the
> * physical pages in VM.
> */
> -void tdp_identity_map_default_memslots(struct vmx_pages *vmx,
> - struct kvm_vm *vm)
> +void tdp_identity_map_default_memslots(struct kvm_vm *vm)
> {
> uint32_t s, memslot = 0;
> sparsebit_idx_t i, last;
> @@ -520,16 +512,15 @@ void tdp_identity_map_default_memslots(struct vmx_pages *vmx,
> if (i > last)
> break;
>
> - tdp_map(vmx, vm, (uint64_t)i << vm->page_shift,
> + tdp_map(vm, (uint64_t)i << vm->page_shift,
> (uint64_t)i << vm->page_shift, 1 << vm->page_shift);
> }
> }
>
> /* Identity map a region with 1GiB Pages. */
> -void tdp_identity_map_1g(struct vmx_pages *vmx, struct kvm_vm *vm,
> - uint64_t addr, uint64_t size)
> +void tdp_identity_map_1g(struct kvm_vm *vm, uint64_t addr, uint64_t size)
> {
> - __tdp_map(vmx, vm, addr, addr, size, PG_LEVEL_1G);
> + __tdp_map(vm, addr, addr, size, PG_LEVEL_1G);
> }
>
> bool kvm_cpu_has_ept(void)
> diff --git a/tools/testing/selftests/kvm/x86/vmx_dirty_log_test.c b/tools/testing/selftests/kvm/x86/vmx_dirty_log_test.c
> index 5c8cf8ac42a2..370f8d3117c2 100644
> --- a/tools/testing/selftests/kvm/x86/vmx_dirty_log_test.c
> +++ b/tools/testing/selftests/kvm/x86/vmx_dirty_log_test.c
> @@ -80,7 +80,6 @@ void l1_guest_code(struct vmx_pages *vmx)
> static void test_vmx_dirty_log(bool enable_ept)
> {
> vm_vaddr_t vmx_pages_gva = 0;
> - struct vmx_pages *vmx;
> unsigned long *bmap;
> uint64_t *host_test_mem;
>
> @@ -96,7 +95,7 @@ static void test_vmx_dirty_log(bool enable_ept)
> if (enable_ept)
> vm_enable_ept(vm);
>
> - vmx = vcpu_alloc_vmx(vm, &vmx_pages_gva);
> + vcpu_alloc_vmx(vm, &vmx_pages_gva);
> vcpu_args_set(vcpu, 1, vmx_pages_gva);
>
> /* Add an extra memory slot for testing dirty logging */
> @@ -120,9 +119,9 @@ static void test_vmx_dirty_log(bool enable_ept)
> * GPAs as the EPT enabled case.
> */
> if (enable_ept) {
> - tdp_identity_map_default_memslots(vmx, vm);
> - tdp_map(vmx, vm, NESTED_TEST_MEM1, GUEST_TEST_MEM, PAGE_SIZE);
> - tdp_map(vmx, vm, NESTED_TEST_MEM2, GUEST_TEST_MEM, PAGE_SIZE);
> + tdp_identity_map_default_memslots(vm);
> + tdp_map(vm, NESTED_TEST_MEM1, GUEST_TEST_MEM, PAGE_SIZE);
> + tdp_map(vm, NESTED_TEST_MEM2, GUEST_TEST_MEM, PAGE_SIZE);
> }
>
> bmap = bitmap_zalloc(TEST_MEM_PAGES);
> --
> 2.52.0.351.gbe84eed79e-goog
>
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