From patchwork Wed Nov 8 18:30:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 742450 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BFF61C4167B for ; Wed, 8 Nov 2023 19:00:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232790AbjKHTAt (ORCPT ); Wed, 8 Nov 2023 14:00:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56844 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232702AbjKHTAc (ORCPT ); Wed, 8 Nov 2023 14:00:32 -0500 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.9]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 593B1213D; Wed, 8 Nov 2023 11:00:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1699470029; x=1731006029; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Ze9yHJfjDYrnDYjpHoXVOqA9CFbTZQF3q6E6RV+EKNU=; b=ajcAuu0GP+h2NuPBedt2fQCQQCy9HCQRcGkijDMQqcfGE5OybX3sPs7p nqa0PIUQPg2r4eksHL9L5v+0lTGuHjNUR+1DmGbkAUvlN11L2UJtOAV8u ox9I/KyG3yh/mArk18arK7cJKPoOXMsxxfG7xZlVwla/rodddMSskv1/4 zDE/Eh8iXmSPlG++Jgh+WUzs5TcBeTClwa4EOlHTdKCXJ+LdgXHdY1sYN zpivHYgWILHCFqB+/vRYNhwKimetf6T8a47XHqYdlooIlskqvycMFyXGr 9BwgCvulVL/jaBzboWJm7wmXE2pQ8/+FFVzWvEISelCTuskwK4If4Tyvn Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10888"; a="8486466" X-IronPort-AV: E=Sophos;i="6.03,287,1694761200"; d="scan'208";a="8486466" Received: from orviesa001.jf.intel.com ([10.64.159.141]) by orvoesa101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Nov 2023 11:00:28 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.03,287,1694761200"; d="scan'208";a="10892519" Received: from unknown (HELO fred..) ([172.25.112.68]) by orviesa001.jf.intel.com with ESMTP; 08 Nov 2023 11:00:27 -0800 From: Xin Li To: kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: seanjc@google.com, pbonzini@redhat.com, corbet@lwn.net, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, vkuznets@redhat.com, peterz@infradead.org, ravi.v.shankar@intel.com Subject: [PATCH v1 22/23] KVM: selftests: Add a new VM guest mode to run user level code Date: Wed, 8 Nov 2023 10:30:02 -0800 Message-ID: <20231108183003.5981-23-xin3.li@intel.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231108183003.5981-1-xin3.li@intel.com> References: <20231108183003.5981-1-xin3.li@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Add a new VM guest mode VM_MODE_PXXV48_4K_USER to set the user bit of guest page table entries, thus allow user level code to run in guests. Suggested-by: Sean Christopherson Signed-off-by: Xin Li --- .../testing/selftests/kvm/include/kvm_util_base.h | 1 + tools/testing/selftests/kvm/lib/kvm_util.c | 5 ++++- .../testing/selftests/kvm/lib/x86_64/processor.c | 15 ++++++++++----- tools/testing/selftests/kvm/lib/x86_64/vmx.c | 4 ++-- 4 files changed, 17 insertions(+), 8 deletions(-) diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h index a18db6a7b3cf..1d2922447978 100644 --- a/tools/testing/selftests/kvm/include/kvm_util_base.h +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h @@ -185,6 +185,7 @@ enum vm_guest_mode { VM_MODE_P36V48_16K, VM_MODE_P36V48_64K, VM_MODE_P36V47_16K, + VM_MODE_PXXV48_4K_USER, /* For 48bits VA but ANY bits PA with USER bit set */ NUM_VM_MODES, }; diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 7a8af1821f5d..36f2acb378b6 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -162,6 +162,7 @@ const char *vm_guest_mode_string(uint32_t i) [VM_MODE_P36V48_16K] = "PA-bits:36, VA-bits:48, 16K pages", [VM_MODE_P36V48_64K] = "PA-bits:36, VA-bits:48, 64K pages", [VM_MODE_P36V47_16K] = "PA-bits:36, VA-bits:47, 16K pages", + [VM_MODE_PXXV48_4K_USER] = "PA-bits:ANY, VA-bits:48, 4K user pages", }; _Static_assert(sizeof(strings)/sizeof(char *) == NUM_VM_MODES, "Missing new mode strings?"); @@ -187,6 +188,7 @@ const struct vm_guest_mode_params vm_guest_mode_params[] = { [VM_MODE_P36V48_16K] = { 36, 48, 0x4000, 14 }, [VM_MODE_P36V48_64K] = { 36, 48, 0x10000, 16 }, [VM_MODE_P36V47_16K] = { 36, 47, 0x4000, 14 }, + [VM_MODE_PXXV48_4K_USER] = { 0, 0, 0x1000, 12 }, }; _Static_assert(sizeof(vm_guest_mode_params)/sizeof(struct vm_guest_mode_params) == NUM_VM_MODES, "Missing new mode params?"); @@ -260,6 +262,7 @@ struct kvm_vm *____vm_create(enum vm_guest_mode mode) vm->pgtable_levels = 3; break; case VM_MODE_PXXV48_4K: + case VM_MODE_PXXV48_4K_USER: #ifdef __x86_64__ kvm_get_cpu_address_width(&vm->pa_bits, &vm->va_bits); /* @@ -275,7 +278,7 @@ struct kvm_vm *____vm_create(enum vm_guest_mode mode) vm->pgtable_levels = 4; vm->va_bits = 48; #else - TEST_FAIL("VM_MODE_PXXV48_4K not supported on non-x86 platforms"); + TEST_FAIL("VM_MODE_PXXV48_4K(_USER) not supported on non-x86 platforms"); #endif break; case VM_MODE_P47V64_4K: diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c index d8288374078e..a8e60641df53 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c @@ -124,8 +124,8 @@ bool kvm_is_tdp_enabled(void) void virt_arch_pgd_alloc(struct kvm_vm *vm) { - TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use " - "unknown or unsupported guest mode, mode: 0x%x", vm->mode); + TEST_ASSERT((vm->mode == VM_MODE_PXXV48_4K) || (vm->mode == VM_MODE_PXXV48_4K_USER), + "Attempt to use unknown or unsupported guest mode, mode: 0x%x", vm->mode); /* If needed, create page map l4 table. */ if (!vm->pgd_created) { @@ -159,6 +159,8 @@ static uint64_t *virt_create_upper_pte(struct kvm_vm *vm, if (!(*pte & PTE_PRESENT_MASK)) { *pte = PTE_PRESENT_MASK | PTE_WRITABLE_MASK; + if (vm->mode == VM_MODE_PXXV48_4K_USER) + *pte |= PTE_USER_MASK; if (current_level == target_level) *pte |= PTE_LARGE_MASK | (paddr & PHYSICAL_PAGE_MASK); else @@ -185,7 +187,7 @@ void __virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, int level) uint64_t *pml4e, *pdpe, *pde; uint64_t *pte; - TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, + TEST_ASSERT((vm->mode == VM_MODE_PXXV48_4K) || (vm->mode == VM_MODE_PXXV48_4K_USER), "Unknown or unsupported guest mode, mode: 0x%x", vm->mode); TEST_ASSERT((vaddr % pg_size) == 0, @@ -222,6 +224,8 @@ void __virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, int level) TEST_ASSERT(!(*pte & PTE_PRESENT_MASK), "PTE already present for 4k page at vaddr: 0x%lx\n", vaddr); *pte = PTE_PRESENT_MASK | PTE_WRITABLE_MASK | (paddr & PHYSICAL_PAGE_MASK); + if (vm->mode == VM_MODE_PXXV48_4K_USER) + *pte |= PTE_USER_MASK; } void virt_arch_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr) @@ -268,8 +272,8 @@ uint64_t *__vm_get_page_table_entry(struct kvm_vm *vm, uint64_t vaddr, TEST_ASSERT(*level >= PG_LEVEL_NONE && *level < PG_LEVEL_NUM, "Invalid PG_LEVEL_* '%d'", *level); - TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use " - "unknown or unsupported guest mode, mode: 0x%x", vm->mode); + TEST_ASSERT((vm->mode == VM_MODE_PXXV48_4K) || (vm->mode == VM_MODE_PXXV48_4K_USER), + "Attempt to use unknown or unsupported guest mode, mode: 0x%x", vm->mode); TEST_ASSERT(sparsebit_is_set(vm->vpages_valid, (vaddr >> vm->page_shift)), "Invalid virtual address, vaddr: 0x%lx", @@ -536,6 +540,7 @@ static void vcpu_setup(struct kvm_vm *vm, struct kvm_vcpu *vcpu) switch (vm->mode) { case VM_MODE_PXXV48_4K: + case VM_MODE_PXXV48_4K_USER: sregs.cr0 = X86_CR0_PE | X86_CR0_NE | X86_CR0_PG; sregs.cr4 |= X86_CR4_PAE | X86_CR4_OSFXSR; sregs.efer |= (EFER_LME | EFER_LMA | EFER_NX); diff --git a/tools/testing/selftests/kvm/lib/x86_64/vmx.c b/tools/testing/selftests/kvm/lib/x86_64/vmx.c index 59d97531c9b1..65147de6f9c0 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/vmx.c +++ b/tools/testing/selftests/kvm/lib/x86_64/vmx.c @@ -403,8 +403,8 @@ void __nested_pg_map(struct vmx_pages *vmx, struct kvm_vm *vm, struct eptPageTableEntry *pt = vmx->eptp_hva, *pte; uint16_t index; - TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use " - "unknown or unsupported guest mode, mode: 0x%x", vm->mode); + TEST_ASSERT((vm->mode == VM_MODE_PXXV48_4K) || (vm->mode == VM_MODE_PXXV48_4K_USER), + "Attempt to use unknown or unsupported guest mode, mode: 0x%x", vm->mode); TEST_ASSERT((nested_paddr >> 48) == 0, "Nested physical address 0x%lx requires 5-level paging",