From nobody Sun Oct 5 07:26:07 2025 Received: from mail-pl1-f201.google.com (mail-pl1-f201.google.com [209.85.214.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 302D827B4F7 for ; Thu, 7 Aug 2025 20:17:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754597834; cv=none; b=Rwa8uulkgspM8XDmR1xoa0kFX6GA0f4wdWp7Kd41oqpkjmUiDMMzeXmefuHYGxhFOki0HU20ME3FokztBDEActLQryE9+WkztzYUCqjSQoXoczXvV2m/Dl2PyNuUAu7TBciGqG1C60AygXSNScH2/sf+gLtPDk4RQtJzFh1Ru5Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754597834; c=relaxed/simple; bh=Cx031TrNZdIdQOdyX5MvihIAkWY+q9L/OKrZ+vPmjlk=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=mYM4+Z4J4x/+07WvyK8G5PINfKiy+qV7uxow455UIdV0pnBoRUMs2UhANqSrAC9gkJNMb3LFKij5UlivXJ5SKYcbPQRxn/c7vf1GVyc2TQqbo6W3OqX9aaVWOejm/K3eo2m0dpvJ8msXMivJNBNYuHYf4hTUcAzGEPH9u4m5l8k= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--sagis.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=vPuZMWUy; arc=none smtp.client-ip=209.85.214.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--sagis.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="vPuZMWUy" Received: by mail-pl1-f201.google.com with SMTP id d9443c01a7336-2400b28296fso21118035ad.1 for ; Thu, 07 Aug 2025 13:17:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1754597833; x=1755202633; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=j3wuATvJOp/SkY0VMTyZzPLWrVuKCL/L6FqFW9/aW0g=; b=vPuZMWUykW85vr/wUjK3QQMoHeV4Zz+KVwBtTvK7shKxAyy3E633YVhLX4r5ad4847 2YdpmahzlOzPrkptmxnKIdSdurHZpdXSB4FubuFLVC3Z0k4d7L4dXGbwybpdOrOmR4YK 73L2obkmBKni/ry2KhMlJL1T13EDGaNO6scZcXPKeSDN/SeyhmT1eQhiLCqeRrYB99WC jc0Eo0Wi5Uu1qfVzaF8zI9u3yWGNgMM0suJCfdYQFg78zlab2Glk8huP3Y2I2Mis9hG5 L3RxQviaR+bxvrkcxlIicSDVkQmK7RmhhidvALVDDSnovNuMuCi7gkDPfFDPZ3vnGyU1 QxSQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754597833; x=1755202633; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=j3wuATvJOp/SkY0VMTyZzPLWrVuKCL/L6FqFW9/aW0g=; b=JArv5MGq1P8Awmhpq52CY766v/mwrwEHiV4REGSgNhz9zen+UuM6JHWQvsFLFjIqJW JPYf0KGNgPyYg5eACwJu0l6ryCE2yUhJ9N+hgtCoeXgZZKNgPl4fJB+UVKYIo7YsPvDx x61orygkLGwwViHUQCOD0C3VJCAjWUEZEbOZlZJB+2OHezWpbYxlsTFnCtWMDjl8KZmP pWhExhStR+k9iPuGlpTzAg+8m0xk91+n/O8zViMYi3Vcxcq5N649yXnxRY9jj/B8wSRF PJ61eS+r/DEGbgY3eqVU7LteDq985nIKG+Ltfbw4POaNyABueNBlYYlgjVAxxzUQ+/pG 6kiA== X-Gm-Message-State: AOJu0Yw7vl+A7OySc9o+RSAG1xIexDJwq4DG4RUWJRlrOh7APw4UZSLJ dUQEA6d+P7M5geTgQUeYcqWGkEc2o4W8v9gTa0Shm5PhoEFaeu3X5Dbe4aQd4TNM/K1ZEqsFoRS NWw== X-Google-Smtp-Source: AGHT+IE/3DFZe9krhrc2eyCS++Yn/kdLvd8XWaVDRyTWJURT0NfTFvhoaMS+6eOuMSLA/3cLW1O97RFczg== X-Received: from pjoa22.prod.google.com ([2002:a17:90a:8c16:b0:31e:d9dc:605f]) (user=sagis job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:ef0a:b0:235:f459:69c7 with SMTP id d9443c01a7336-242c225dbfemr4507735ad.52.1754597832669; Thu, 07 Aug 2025 13:17:12 -0700 (PDT) Date: Thu, 7 Aug 2025 13:16:19 -0700 In-Reply-To: <20250807201628.1185915-1-sagis@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250807201628.1185915-1-sagis@google.com> X-Mailer: git-send-email 2.51.0.rc0.155.g4a0f42376b-goog Message-ID: <20250807201628.1185915-24-sagis@google.com> Subject: [PATCH v8 23/30] KVM: selftests: Add functions to allow mapping as shared From: Sagi Shahar To: linux-kselftest@vger.kernel.org, Paolo Bonzini , Shuah Khan , Sean Christopherson , Ackerley Tng , Ryan Afranji , Andrew Jones , Isaku Yamahata , Erdem Aktas , Rick Edgecombe , Sagi Shahar , Roger Wang , Binbin Wu , Oliver Upton , "Pratik R. Sampat" , Reinette Chatre , Ira Weiny Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Ackerley Tng virt_map() enforces a private mapping for private memory. Introduce virt_map_shared() that creates a shared mapping for private as well as shared memory. This way, the TD does not have to remap its page tables at runtime. Signed-off-by: Ackerley Tng Signed-off-by: Sagi Shahar --- .../testing/selftests/kvm/include/kvm_util.h | 23 +++++++++++++ tools/testing/selftests/kvm/lib/kvm_util.c | 34 +++++++++++++++++++ .../testing/selftests/kvm/lib/x86/processor.c | 15 ++++++-- 3 files changed, 70 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing= /selftests/kvm/include/kvm_util.h index 0d1f24c9f7c7..2e444c172261 100644 --- a/tools/testing/selftests/kvm/include/kvm_util.h +++ b/tools/testing/selftests/kvm/include/kvm_util.h @@ -662,6 +662,8 @@ vm_vaddr_t vm_vaddr_alloc_page(struct kvm_vm *vm); =20 void virt_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, unsigned int npages); +void virt_map_shared(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, + unsigned int npages); void *addr_gpa2hva(struct kvm_vm *vm, vm_paddr_t gpa); void *addr_gva2hva(struct kvm_vm *vm, vm_vaddr_t gva); vm_paddr_t addr_hva2gpa(struct kvm_vm *vm, void *hva); @@ -1137,6 +1139,27 @@ static inline void virt_pg_map(struct kvm_vm *vm, ui= nt64_t vaddr, uint64_t paddr virt_arch_pg_map(vm, vaddr, paddr); } =20 +/* + * VM Virtual Page Map as Shared + * + * Input Args: + * vm - Virtual Machine + * vaddr - VM Virtual Address + * paddr - VM Physical Address + * + * Output Args: None + * + * Return: None + * + * Within @vm, creates a virtual translation for the page starting + * at @vaddr to the page starting at @paddr. + */ +void virt_arch_pg_map_shared(struct kvm_vm *vm, uint64_t vaddr, uint64_t p= addr); + +static inline void virt_pg_map_shared(struct kvm_vm *vm, uint64_t vaddr, u= int64_t paddr) +{ + virt_arch_pg_map_shared(vm, vaddr, paddr); +} =20 /* * Address Guest Virtual to Guest Physical diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/sel= ftests/kvm/lib/kvm_util.c index f7e00ea0b211..14edb1de5434 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -7,6 +7,7 @@ #include "test_util.h" #include "kvm_util.h" #include "processor.h" +#include "sparsebit.h" #include "ucall_common.h" =20 #include @@ -1621,6 +1622,39 @@ void virt_map(struct kvm_vm *vm, uint64_t vaddr, uin= t64_t paddr, } } =20 +/* + * Map a range of VM virtual address to the VM's physical address as shared + * + * Input Args: + * vm - Virtual Machine + * vaddr - Virtual address to map + * paddr - VM Physical Address + * npages - The number of pages to map + * + * Output Args: None + * + * Return: None + * + * Within the VM given by @vm, creates a virtual translation for + * @npages starting at @vaddr to the page range starting at @paddr. + */ +void virt_map_shared(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, + unsigned int npages) +{ + size_t page_size =3D vm->page_size; + size_t size =3D npages * page_size; + + TEST_ASSERT(vaddr + size > vaddr, "Vaddr overflow"); + TEST_ASSERT(paddr + size > paddr, "Paddr overflow"); + + while (npages--) { + virt_pg_map_shared(vm, vaddr, paddr); + sparsebit_set(vm->vpages_mapped, vaddr >> vm->page_shift); + vaddr +=3D page_size; + paddr +=3D page_size; + } +} + /* * Address VM Physical to Host Virtual * diff --git a/tools/testing/selftests/kvm/lib/x86/processor.c b/tools/testin= g/selftests/kvm/lib/x86/processor.c index 3977719c7893..7742c01d48b1 100644 --- a/tools/testing/selftests/kvm/lib/x86/processor.c +++ b/tools/testing/selftests/kvm/lib/x86/processor.c @@ -181,7 +181,8 @@ static uint64_t *virt_create_upper_pte(struct kvm_vm *v= m, return pte; } =20 -void __virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, int = level) +static void ___virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t pad= dr, + int level, bool protected) { const uint64_t pg_size =3D PG_LEVEL_SIZE(level); uint64_t *pml4e, *pdpe, *pde; @@ -231,17 +232,27 @@ void __virt_pg_map(struct kvm_vm *vm, uint64_t vaddr,= uint64_t paddr, int level) * Neither SEV nor TDX supports shared page tables, so only the final * leaf PTE needs manually set the C/S-bit. */ - if (vm_is_gpa_protected(vm, paddr)) + if (protected) *pte |=3D vm->arch.c_bit; else *pte |=3D vm->arch.s_bit; } =20 +void __virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, int = level) +{ + ___virt_pg_map(vm, vaddr, paddr, level, vm_is_gpa_protected(vm, paddr)); +} + void virt_arch_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr) { __virt_pg_map(vm, vaddr, paddr, PG_LEVEL_4K); } =20 +void virt_arch_pg_map_shared(struct kvm_vm *vm, uint64_t vaddr, uint64_t p= addr) +{ + ___virt_pg_map(vm, vaddr, paddr, PG_LEVEL_4K, false); +} + void virt_map_level(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, uint64_t nr_bytes, int level) { --=20 2.51.0.rc0.155.g4a0f42376b-goog