From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
Marc Zyngier <maz@kernel.org>,
Oliver Upton <oliver.upton@linux.dev>,
Huacai Chen <chenhuacai@kernel.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Anup Patel <anup@brainfault.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Sean Christopherson <seanjc@google.com>,
"Matthew Wilcox (Oracle)" <willy@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Paul Moore <paul@paul-moore.com>,
James Morris <jmorris@namei.org>,
"Serge E. Hallyn" <serge@hallyn.com>
Cc: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
kvmarm@lists.linux.dev, linux-mips@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org,
linux-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org, linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org,
Chao Peng <chao.p.peng@linux.intel.com>,
Fuad Tabba <tabba@google.com>,
Jarkko Sakkinen <jarkko@kernel.org>,
Yu Zhang <yu.c.zhang@linux.intel.com>,
Vishal Annapurve <vannapurve@google.com>,
Ackerley Tng <ackerleytng@google.com>,
Maciej Szmigiero <mail@maciej.szmigiero.name>,
Vlastimil Babka <vbabka@suse.cz>,
David Hildenbrand <david@redhat.com>,
Quentin Perret <qperret@google.com>,
Michael Roth <michael.roth@amd.com>, Wang <wei.w.wang@intel.com>,
Liam Merwick <liam.merwick@oracle.com>,
Isaku Yamahata <isaku.yamahata@gmail.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [RFC PATCH v11 17/29] KVM: x86: Add support for "protected VMs" that can utilize private memory
Date: Tue, 18 Jul 2023 16:45:00 -0700 [thread overview]
Message-ID: <20230718234512.1690985-18-seanjc@google.com> (raw)
In-Reply-To: <20230718234512.1690985-1-seanjc@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
Documentation/virt/kvm/api.rst | 32 ++++++++++++++++++++++++++++++++
arch/x86/include/asm/kvm_host.h | 15 +++++++++------
arch/x86/include/uapi/asm/kvm.h | 3 +++
arch/x86/kvm/Kconfig | 12 ++++++++++++
arch/x86/kvm/mmu/mmu_internal.h | 1 +
arch/x86/kvm/x86.c | 16 +++++++++++++++-
include/uapi/linux/kvm.h | 1 +
virt/kvm/Kconfig | 5 +++++
8 files changed, 78 insertions(+), 7 deletions(-)
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 0ca8561775ac..9f7b95327c2a 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -147,10 +147,29 @@ described as 'basic' will be available.
The new VM has no virtual cpus and no memory.
You probably want to use 0 as machine type.
+X86:
+^^^^
+
+Supported X86 VM types can be queried via KVM_CAP_VM_TYPES.
+
+S390:
+^^^^^
+
In order to create user controlled virtual machines on S390, check
KVM_CAP_S390_UCONTROL and use the flag KVM_VM_S390_UCONTROL as
privileged user (CAP_SYS_ADMIN).
+MIPS:
+^^^^^
+
+To use hardware assisted virtualization on MIPS (VZ ASE) rather than
+the default trap & emulate implementation (which changes the virtual
+memory layout to fit in user mode), check KVM_CAP_MIPS_VZ and use the
+flag KVM_VM_MIPS_VZ.
+
+ARM64:
+^^^^^^
+
On arm64, the physical address size for a VM (IPA Size limit) is limited
to 40bits by default. The limit can be configured if the host supports the
extension KVM_CAP_ARM_VM_IPA_SIZE. When supported, use
@@ -8554,6 +8573,19 @@ block sizes is exposed in KVM_CAP_ARM_SUPPORTED_BLOCK_SIZES as a
This capability indicates KVM supports per-page memory attributes and ioctls
KVM_GET_SUPPORTED_MEMORY_ATTRIBUTES/KVM_SET_MEMORY_ATTRIBUTES are available.
+8.41 KVM_CAP_VM_TYPES
+---------------------
+
+:Capability: KVM_CAP_MEMORY_ATTRIBUTES
+:Architectures: x86
+:Type: system ioctl
+
+This capability returns a bitmap of support VM types. The 1-setting of bit @n
+means the VM type with value @n is supported. Possible values of @n are::
+
+ #define KVM_X86_DEFAULT_VM 0
+ #define KVM_X86_SW_PROTECTED_VM 1
+
9. Known KVM API problems
=========================
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 08b44544a330..bbefd79b7950 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1227,6 +1227,7 @@ enum kvm_apicv_inhibit {
};
struct kvm_arch {
+ unsigned long vm_type;
unsigned long n_used_mmu_pages;
unsigned long n_requested_mmu_pages;
unsigned long n_max_mmu_pages;
@@ -2058,6 +2059,12 @@ void kvm_mmu_new_pgd(struct kvm_vcpu *vcpu, gpa_t new_pgd);
void kvm_configure_mmu(bool enable_tdp, int tdp_forced_root_level,
int tdp_max_root_level, int tdp_huge_page_level);
+#ifdef CONFIG_KVM_PRIVATE_MEM
+#define kvm_arch_has_private_mem(kvm) ((kvm)->arch.vm_type != KVM_X86_DEFAULT_VM)
+#else
+#define kvm_arch_has_private_mem(kvm) false
+#endif
+
static inline u16 kvm_read_ldt(void)
{
u16 ldt;
@@ -2106,14 +2113,10 @@ enum {
#define HF_SMM_INSIDE_NMI_MASK (1 << 2)
# define KVM_MAX_NR_ADDRESS_SPACES 2
+/* SMM is currently unsupported for guests with private memory. */
+# define kvm_arch_nr_memslot_as_ids(kvm) (kvm_arch_has_private_mem(kvm) ? 1 : 2)
# define kvm_arch_vcpu_memslots_id(vcpu) ((vcpu)->arch.hflags & HF_SMM_MASK ? 1 : 0)
# define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, (role).smm)
-
-static inline int kvm_arch_nr_memslot_as_ids(struct kvm *kvm)
-{
- return KVM_MAX_NR_ADDRESS_SPACES;
-}
-
#else
# define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, 0)
#endif
diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
index 1a6a1f987949..a448d0964fc0 100644
--- a/arch/x86/include/uapi/asm/kvm.h
+++ b/arch/x86/include/uapi/asm/kvm.h
@@ -562,4 +562,7 @@ struct kvm_pmu_event_filter {
/* x86-specific KVM_EXIT_HYPERCALL flags. */
#define KVM_EXIT_HYPERCALL_LONG_MODE BIT(0)
+#define KVM_X86_DEFAULT_VM 0
+#define KVM_X86_SW_PROTECTED_VM 1
+
#endif /* _ASM_X86_KVM_H */
diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index a7eb2bdbfb18..029c76bcd1a5 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -77,6 +77,18 @@ config KVM_WERROR
If in doubt, say "N".
+config KVM_SW_PROTECTED_VM
+ bool "Enable support for KVM software-protected VMs"
+ depends on EXPERT
+ depends on X86_64
+ select KVM_GENERIC_PRIVATE_MEM
+ help
+ Enable support for KVM software-protected VMs. Currently "protected"
+ means the VM can be backed with memory provided by
+ KVM_CREATE_GUEST_MEMFD.
+
+ If unsure, say "N".
+
config KVM_INTEL
tristate "KVM for Intel (and compatible) processors support"
depends on KVM && IA32_FEAT_CTL
diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
index 268b517e88cb..f1786698ae00 100644
--- a/arch/x86/kvm/mmu/mmu_internal.h
+++ b/arch/x86/kvm/mmu/mmu_internal.h
@@ -301,6 +301,7 @@ static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
.max_level = KVM_MAX_HUGEPAGE_LEVEL,
.req_level = PG_LEVEL_4K,
.goal_level = PG_LEVEL_4K,
+ .is_private = kvm_mem_is_private(vcpu->kvm, cr2_or_gpa >> PAGE_SHIFT),
};
int r;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 463ecf70cec0..de195ad83ec0 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4427,6 +4427,13 @@ static int kvm_ioctl_get_supported_hv_cpuid(struct kvm_vcpu *vcpu,
return 0;
}
+static bool kvm_is_vm_type_supported(unsigned long type)
+{
+ return type == KVM_X86_DEFAULT_VM ||
+ (type == KVM_X86_SW_PROTECTED_VM &&
+ IS_ENABLED(CONFIG_KVM_SW_PROTECTED_VM) && tdp_enabled);
+}
+
int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
{
int r = 0;
@@ -4617,6 +4624,11 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_X86_NOTIFY_VMEXIT:
r = kvm_caps.has_notify_vmexit;
break;
+ case KVM_CAP_VM_TYPES:
+ r = BIT(KVM_X86_DEFAULT_VM);
+ if (kvm_is_vm_type_supported(KVM_X86_SW_PROTECTED_VM))
+ r |= BIT(KVM_X86_SW_PROTECTED_VM);
+ break;
default:
break;
}
@@ -12274,9 +12286,11 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
int ret;
unsigned long flags;
- if (type)
+ if (!kvm_is_vm_type_supported(type))
return -EINVAL;
+ kvm->arch.vm_type = type;
+
ret = kvm_page_track_init(kvm);
if (ret)
goto out;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 17b12ee8b70e..eb900344a054 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1216,6 +1216,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_ARM_SUPPORTED_BLOCK_SIZES 229
#define KVM_CAP_USER_MEMORY2 230
#define KVM_CAP_MEMORY_ATTRIBUTES 231
+#define KVM_CAP_VM_TYPES 232
#ifdef KVM_CAP_IRQ_ROUTING
diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index 3ee3205e0b39..1a48cb530092 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -107,3 +107,8 @@ config KVM_GENERIC_MEMORY_ATTRIBUTES
config KVM_PRIVATE_MEM
select XARRAY_MULTI
bool
+
+config KVM_GENERIC_PRIVATE_MEM
+ select KVM_GENERIC_MEMORY_ATTRIBUTES
+ select KVM_PRIVATE_MEM
+ bool
--
2.41.0.255.g8b1d071c50-goog
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next prev parent reply other threads:[~2023-07-19 6:02 UTC|newest]
Thread overview: 131+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-18 23:44 [RFC PATCH v11 00/29] KVM: guest_memfd() and per-page attributes Sean Christopherson
2023-07-18 23:44 ` [RFC PATCH v11 01/29] KVM: Wrap kvm_gfn_range.pte in a per-action union Sean Christopherson
2023-07-19 13:39 ` Jarkko Sakkinen
2023-07-19 15:39 ` Sean Christopherson
2023-07-19 16:55 ` Paolo Bonzini
2023-07-26 20:22 ` Sean Christopherson
2023-07-21 6:26 ` Yan Zhao
2023-07-21 10:45 ` Xu Yilun
2023-07-25 18:05 ` Sean Christopherson
2023-07-18 23:44 ` [RFC PATCH v11 02/29] KVM: Tweak kvm_hva_range and hva_handler_t to allow reusing for gfn ranges Sean Christopherson
2023-07-19 17:12 ` Paolo Bonzini
2023-07-18 23:44 ` [RFC PATCH v11 03/29] KVM: Use gfn instead of hva for mmu_notifier_retry Sean Christopherson
2023-07-19 17:12 ` Paolo Bonzini
2023-07-18 23:44 ` [RFC PATCH v11 04/29] KVM: PPC: Drop dead code related to KVM_ARCH_WANT_MMU_NOTIFIER Sean Christopherson
2023-07-19 17:34 ` Paolo Bonzini
2023-07-18 23:44 ` [RFC PATCH v11 05/29] KVM: Convert KVM_ARCH_WANT_MMU_NOTIFIER to CONFIG_KVM_GENERIC_MMU_NOTIFIER Sean Christopherson
2023-07-19 7:31 ` Yuan Yao
2023-07-19 14:15 ` Sean Christopherson
2023-07-20 1:15 ` Yuan Yao
2023-07-18 23:44 ` [RFC PATCH v11 06/29] KVM: Introduce KVM_SET_USER_MEMORY_REGION2 Sean Christopherson
2023-07-21 9:03 ` Paolo Bonzini
2023-07-28 9:25 ` Quentin Perret
2023-07-29 0:03 ` Sean Christopherson
2023-07-31 9:30 ` Quentin Perret
2023-07-31 15:58 ` Paolo Bonzini
2023-07-18 23:44 ` [RFC PATCH v11 07/29] KVM: Add KVM_EXIT_MEMORY_FAULT exit Sean Christopherson
2023-07-19 7:54 ` Yuan Yao
2023-07-19 14:16 ` Sean Christopherson
2023-07-18 23:44 ` [RFC PATCH v11 08/29] KVM: Introduce per-page memory attributes Sean Christopherson
2023-07-20 8:09 ` Yuan Yao
2023-07-20 19:02 ` Isaku Yamahata
2023-07-20 20:20 ` Sean Christopherson
2023-07-21 10:57 ` Paolo Bonzini
2023-07-21 15:56 ` Xiaoyao Li
2023-07-24 4:43 ` Xu Yilun
2023-07-26 15:59 ` Sean Christopherson
2023-07-27 3:24 ` Xu Yilun
2023-08-02 20:31 ` Isaku Yamahata
2023-08-14 0:44 ` Binbin Wu
2023-08-14 21:54 ` Sean Christopherson
2023-07-18 23:44 ` [RFC PATCH v11 09/29] KVM: x86: Disallow hugepages when memory attributes are mixed Sean Christopherson
2023-07-21 11:59 ` Paolo Bonzini
2023-07-21 17:41 ` Sean Christopherson
2023-07-18 23:44 ` [RFC PATCH v11 10/29] mm: Add AS_UNMOVABLE to mark mapping as completely unmovable Sean Christopherson
2023-07-25 10:24 ` Kirill A . Shutemov
2023-07-25 12:51 ` Matthew Wilcox
2023-07-26 11:36 ` Kirill A . Shutemov
2023-07-28 16:02 ` Vlastimil Babka
2023-07-28 16:13 ` Paolo Bonzini
2023-09-01 8:23 ` Vlastimil Babka
2023-07-18 23:44 ` [RFC PATCH v11 11/29] security: Export security_inode_init_security_anon() for use by KVM Sean Christopherson
2023-07-19 2:14 ` Paul Moore
2023-07-31 10:46 ` Vlastimil Babka
2023-07-18 23:44 ` [RFC PATCH v11 12/29] KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory Sean Christopherson
2023-07-19 17:21 ` Vishal Annapurve
2023-07-19 17:47 ` Sean Christopherson
2023-07-20 14:45 ` Xiaoyao Li
2023-07-20 15:14 ` Sean Christopherson
2023-07-20 21:28 ` Isaku Yamahata
2023-07-21 6:13 ` Yuan Yao
2023-07-21 22:27 ` Isaku Yamahata
2023-07-21 22:33 ` Sean Christopherson
2023-07-21 15:05 ` Xiaoyao Li
2023-07-21 15:42 ` Xiaoyao Li
2023-07-21 17:42 ` Sean Christopherson
2023-07-21 17:17 ` Paolo Bonzini
2023-07-21 17:50 ` Sean Christopherson
2023-07-25 15:09 ` Wang, Wei W
2023-07-25 16:03 ` Sean Christopherson
2023-07-26 1:51 ` Wang, Wei W
2023-07-31 16:23 ` Fuad Tabba
2023-07-26 17:18 ` Elliot Berman
2023-07-26 19:28 ` Sean Christopherson
2023-07-27 10:39 ` Fuad Tabba
2023-07-27 17:13 ` Sean Christopherson
2023-07-31 13:46 ` Fuad Tabba
2023-08-03 19:15 ` Ryan Afranji
2023-08-07 23:06 ` Ackerley Tng
2023-08-08 21:13 ` Sean Christopherson
2023-08-10 23:57 ` Vishal Annapurve
2023-08-11 17:44 ` Sean Christopherson
2023-08-15 18:43 ` Ackerley Tng
2023-08-15 20:03 ` Sean Christopherson
2023-08-21 17:30 ` Ackerley Tng
2023-08-21 19:33 ` Sean Christopherson
2023-08-28 22:56 ` Ackerley Tng
2023-08-29 2:53 ` Elliot Berman
2023-09-14 19:12 ` Sean Christopherson
2023-09-14 18:15 ` Sean Christopherson
2023-09-14 23:19 ` Ackerley Tng
2023-09-15 0:33 ` Sean Christopherson
2023-08-30 15:12 ` Binbin Wu
2023-08-30 16:44 ` Ackerley Tng
2023-09-01 3:45 ` Binbin Wu
2023-09-01 16:46 ` Ackerley Tng
2023-07-18 23:44 ` [RFC PATCH v11 13/29] KVM: Add transparent hugepage support for dedicated guest memory Sean Christopherson
2023-07-21 15:07 ` Paolo Bonzini
2023-07-21 17:13 ` Sean Christopherson
2023-09-06 22:10 ` Paolo Bonzini
2023-07-18 23:44 ` [RFC PATCH v11 14/29] KVM: x86/mmu: Handle page fault for private memory Sean Christopherson
2023-07-21 15:09 ` Paolo Bonzini
2023-07-18 23:44 ` [RFC PATCH v11 15/29] KVM: Drop superfluous __KVM_VCPU_MULTIPLE_ADDRESS_SPACE macro Sean Christopherson
2023-07-21 15:07 ` Paolo Bonzini
2023-07-18 23:44 ` [RFC PATCH v11 16/29] KVM: Allow arch code to track number of memslot address spaces per VM Sean Christopherson
2023-07-21 15:12 ` Paolo Bonzini
2023-07-18 23:45 ` Sean Christopherson [this message]
2023-07-18 23:45 ` [RFC PATCH v11 18/29] KVM: selftests: Drop unused kvm_userspace_memory_region_find() helper Sean Christopherson
2023-07-21 15:14 ` Paolo Bonzini
2023-07-18 23:45 ` [RFC PATCH v11 19/29] KVM: selftests: Convert lib's mem regions to KVM_SET_USER_MEMORY_REGION2 Sean Christopherson
2023-07-18 23:45 ` [RFC PATCH v11 20/29] KVM: selftests: Add support for creating private memslots Sean Christopherson
2023-07-18 23:45 ` [RFC PATCH v11 21/29] KVM: selftests: Add helpers to convert guest memory b/w private and shared Sean Christopherson
2023-07-18 23:45 ` [RFC PATCH v11 22/29] KVM: selftests: Add helpers to do KVM_HC_MAP_GPA_RANGE hypercalls (x86) Sean Christopherson
2023-07-18 23:45 ` [RFC PATCH v11 23/29] KVM: selftests: Introduce VM "shape" to allow tests to specify the VM type Sean Christopherson
2023-07-18 23:45 ` [RFC PATCH v11 24/29] KVM: selftests: Add GUEST_SYNC[1-6] macros for synchronizing more data Sean Christopherson
2023-07-18 23:45 ` [RFC PATCH v11 25/29] KVM: selftests: Add x86-only selftest for private memory conversions Sean Christopherson
2023-07-18 23:45 ` [RFC PATCH v11 26/29] KVM: selftests: Add KVM_SET_USER_MEMORY_REGION2 helper Sean Christopherson
2023-07-18 23:45 ` [RFC PATCH v11 27/29] KVM: selftests: Expand set_memory_region_test to validate guest_memfd() Sean Christopherson
2023-08-07 23:17 ` Ackerley Tng
2023-07-18 23:45 ` [RFC PATCH v11 28/29] KVM: selftests: Add basic selftest for guest_memfd() Sean Christopherson
2023-08-07 23:20 ` Ackerley Tng
2023-08-18 23:03 ` Sean Christopherson
2023-08-07 23:25 ` Ackerley Tng
2023-08-18 23:01 ` Sean Christopherson
2023-08-21 19:49 ` Ackerley Tng
2023-07-18 23:45 ` [RFC PATCH v11 29/29] KVM: selftests: Test KVM exit behavior for private memory/access Sean Christopherson
2023-07-24 6:38 ` [RFC PATCH v11 00/29] KVM: guest_memfd() and per-page attributes Nikunj A. Dadhania
2023-07-24 17:00 ` Sean Christopherson
2023-07-26 11:20 ` Nikunj A. Dadhania
2023-07-26 14:24 ` Sean Christopherson
2023-07-27 6:42 ` Nikunj A. Dadhania
2023-08-03 11:03 ` Vlastimil Babka
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