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-rw-r--r--Documentation/virt/kvm/api.txt20
-rw-r--r--arch/powerpc/Kconfig17
-rw-r--r--arch/powerpc/include/asm/hvcall.h9
-rw-r--r--arch/powerpc/include/asm/kvm_book3s_uvmem.h74
-rw-r--r--arch/powerpc/include/asm/kvm_host.h6
-rw-r--r--arch/powerpc/include/asm/kvm_ppc.h1
-rw-r--r--arch/powerpc/include/asm/ultravisor-api.h6
-rw-r--r--arch/powerpc/include/asm/ultravisor.h36
-rw-r--r--arch/powerpc/kvm/Makefile3
-rw-r--r--arch/powerpc/kvm/book3s_64_mmu_radix.c25
-rw-r--r--arch/powerpc/kvm/book3s_hv.c143
-rw-r--r--arch/powerpc/kvm/book3s_hv_uvmem.c785
-rw-r--r--arch/powerpc/kvm/powerpc.c12
-rw-r--r--arch/x86/kvm/cpuid.c10
-rw-r--r--arch/x86/kvm/svm.c7
-rw-r--r--arch/x86/kvm/vmx/vmx.c12
-rw-r--r--arch/x86/kvm/vmx/vmx.h8
-rw-r--r--include/uapi/linux/kvm.h1
-rw-r--r--mm/ksm.c1
19 files changed, 1156 insertions, 20 deletions
diff --git a/Documentation/virt/kvm/api.txt b/Documentation/virt/kvm/api.txt
index 49183add44e7..ebb37b34dcfc 100644
--- a/Documentation/virt/kvm/api.txt
+++ b/Documentation/virt/kvm/api.txt
@@ -5,7 +5,7 @@ The Definitive KVM (Kernel-based Virtual Machine) API Documentation
----------------------
The kvm API is a set of ioctls that are issued to control various aspects
-of a virtual machine. The ioctls belong to three classes:
+of a virtual machine. The ioctls belong to the following classes:
- System ioctls: These query and set global attributes which affect the
whole kvm subsystem. In addition a system ioctl is used to create
@@ -4149,6 +4149,24 @@ Valid values for 'action':
#define KVM_PMU_EVENT_ALLOW 0
#define KVM_PMU_EVENT_DENY 1
+4.121 KVM_PPC_SVM_OFF
+
+Capability: basic
+Architectures: powerpc
+Type: vm ioctl
+Parameters: none
+Returns: 0 on successful completion,
+Errors:
+ EINVAL: if ultravisor failed to terminate the secure guest
+ ENOMEM: if hypervisor failed to allocate new radix page tables for guest
+
+This ioctl is used to turn off the secure mode of the guest or transition
+the guest from secure mode to normal mode. This is invoked when the guest
+is reset. This has no effect if called for a normal guest.
+
+This ioctl issues an ultravisor call to terminate the secure guest,
+unpins the VPA pages and releases all the device pages that are used to
+track the secure pages by hypervisor.
5. The kvm_run structure
------------------------
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index e446bb5b3f8d..1ec34e16ed65 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -452,6 +452,23 @@ config PPC_TRANSACTIONAL_MEM
help
Support user-mode Transactional Memory on POWERPC.
+config PPC_UV
+ bool "Ultravisor support"
+ depends on KVM_BOOK3S_HV_POSSIBLE
+ select ZONE_DEVICE
+ select DEV_PAGEMAP_OPS
+ select DEVICE_PRIVATE
+ select MEMORY_HOTPLUG
+ select MEMORY_HOTREMOVE
+ default n
+ help
+ This option paravirtualizes the kernel to run in POWER platforms that
+ supports the Protected Execution Facility (PEF). On such platforms,
+ the ultravisor firmware runs at a privilege level above the
+ hypervisor.
+
+ If unsure, say "N".
+
config LD_HEAD_STUB_CATCH
bool "Reserve 256 bytes to cope with linker stubs in HEAD text" if EXPERT
depends on PPC64
diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h
index 11112023e327..13bd870609c3 100644
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -342,6 +342,15 @@
#define H_TLB_INVALIDATE 0xF808
#define H_COPY_TOFROM_GUEST 0xF80C
+/* Flags for H_SVM_PAGE_IN */
+#define H_PAGE_IN_SHARED 0x1
+
+/* Platform-specific hcalls used by the Ultravisor */
+#define H_SVM_PAGE_IN 0xEF00
+#define H_SVM_PAGE_OUT 0xEF04
+#define H_SVM_INIT_START 0xEF08
+#define H_SVM_INIT_DONE 0xEF0C
+
/* Values for 2nd argument to H_SET_MODE */
#define H_SET_MODE_RESOURCE_SET_CIABR 1
#define H_SET_MODE_RESOURCE_SET_DAWR 2
diff --git a/arch/powerpc/include/asm/kvm_book3s_uvmem.h b/arch/powerpc/include/asm/kvm_book3s_uvmem.h
new file mode 100644
index 000000000000..50204e228f16
--- /dev/null
+++ b/arch/powerpc/include/asm/kvm_book3s_uvmem.h
@@ -0,0 +1,74 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_KVM_BOOK3S_UVMEM_H__
+#define __ASM_KVM_BOOK3S_UVMEM_H__
+
+#ifdef CONFIG_PPC_UV
+int kvmppc_uvmem_init(void);
+void kvmppc_uvmem_free(void);
+int kvmppc_uvmem_slot_init(struct kvm *kvm, const struct kvm_memory_slot *slot);
+void kvmppc_uvmem_slot_free(struct kvm *kvm,
+ const struct kvm_memory_slot *slot);
+unsigned long kvmppc_h_svm_page_in(struct kvm *kvm,
+ unsigned long gra,
+ unsigned long flags,
+ unsigned long page_shift);
+unsigned long kvmppc_h_svm_page_out(struct kvm *kvm,
+ unsigned long gra,
+ unsigned long flags,
+ unsigned long page_shift);
+unsigned long kvmppc_h_svm_init_start(struct kvm *kvm);
+unsigned long kvmppc_h_svm_init_done(struct kvm *kvm);
+int kvmppc_send_page_to_uv(struct kvm *kvm, unsigned long gfn);
+void kvmppc_uvmem_drop_pages(const struct kvm_memory_slot *free,
+ struct kvm *kvm);
+#else
+static inline int kvmppc_uvmem_init(void)
+{
+ return 0;
+}
+
+static inline void kvmppc_uvmem_free(void) { }
+
+static inline int
+kvmppc_uvmem_slot_init(struct kvm *kvm, const struct kvm_memory_slot *slot)
+{
+ return 0;
+}
+
+static inline void
+kvmppc_uvmem_slot_free(struct kvm *kvm, const struct kvm_memory_slot *slot) { }
+
+static inline unsigned long
+kvmppc_h_svm_page_in(struct kvm *kvm, unsigned long gra,
+ unsigned long flags, unsigned long page_shift)
+{
+ return H_UNSUPPORTED;
+}
+
+static inline unsigned long
+kvmppc_h_svm_page_out(struct kvm *kvm, unsigned long gra,
+ unsigned long flags, unsigned long page_shift)
+{
+ return H_UNSUPPORTED;
+}
+
+static inline unsigned long kvmppc_h_svm_init_start(struct kvm *kvm)
+{
+ return H_UNSUPPORTED;
+}
+
+static inline unsigned long kvmppc_h_svm_init_done(struct kvm *kvm)
+{
+ return H_UNSUPPORTED;
+}
+
+static inline int kvmppc_send_page_to_uv(struct kvm *kvm, unsigned long gfn)
+{
+ return -EFAULT;
+}
+
+static inline void
+kvmppc_uvmem_drop_pages(const struct kvm_memory_slot *free,
+ struct kvm *kvm) { }
+#endif /* CONFIG_PPC_UV */
+#endif /* __ASM_KVM_BOOK3S_UVMEM_H__ */
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 4273e799203d..0a398f2321c2 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -275,6 +275,10 @@ struct kvm_hpt_info {
struct kvm_resize_hpt;
+/* Flag values for kvm_arch.secure_guest */
+#define KVMPPC_SECURE_INIT_START 0x1 /* H_SVM_INIT_START has been called */
+#define KVMPPC_SECURE_INIT_DONE 0x2 /* H_SVM_INIT_DONE completed */
+
struct kvm_arch {
unsigned int lpid;
unsigned int smt_mode; /* # vcpus per virtual core */
@@ -330,6 +334,8 @@ struct kvm_arch {
#endif
struct kvmppc_ops *kvm_ops;
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
+ struct mutex uvmem_lock;
+ struct list_head uvmem_pfns;
struct mutex mmu_setup_lock; /* nests inside vcpu mutexes */
u64 l1_ptcr;
int max_nested_lpid;
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index d63f649fe713..3d2f871241a8 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -322,6 +322,7 @@ struct kvmppc_ops {
int size);
int (*store_to_eaddr)(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr,
int size);
+ int (*svm_off)(struct kvm *kvm);
};
extern struct kvmppc_ops *kvmppc_hv_ops;
diff --git a/arch/powerpc/include/asm/ultravisor-api.h b/arch/powerpc/include/asm/ultravisor-api.h
index 4fcda1d5793d..b66f6db7be6c 100644
--- a/arch/powerpc/include/asm/ultravisor-api.h
+++ b/arch/powerpc/include/asm/ultravisor-api.h
@@ -26,8 +26,14 @@
#define UV_WRITE_PATE 0xF104
#define UV_RETURN 0xF11C
#define UV_ESM 0xF110
+#define UV_REGISTER_MEM_SLOT 0xF120
+#define UV_UNREGISTER_MEM_SLOT 0xF124
+#define UV_PAGE_IN 0xF128
+#define UV_PAGE_OUT 0xF12C
#define UV_SHARE_PAGE 0xF130
#define UV_UNSHARE_PAGE 0xF134
#define UV_UNSHARE_ALL_PAGES 0xF140
+#define UV_PAGE_INVAL 0xF138
+#define UV_SVM_TERMINATE 0xF13C
#endif /* _ASM_POWERPC_ULTRAVISOR_API_H */
diff --git a/arch/powerpc/include/asm/ultravisor.h b/arch/powerpc/include/asm/ultravisor.h
index b1bc2e043ed4..790b0e63681f 100644
--- a/arch/powerpc/include/asm/ultravisor.h
+++ b/arch/powerpc/include/asm/ultravisor.h
@@ -46,4 +46,40 @@ static inline int uv_unshare_all_pages(void)
return ucall_norets(UV_UNSHARE_ALL_PAGES);
}
+static inline int uv_page_in(u64 lpid, u64 src_ra, u64 dst_gpa, u64 flags,
+ u64 page_shift)
+{
+ return ucall_norets(UV_PAGE_IN, lpid, src_ra, dst_gpa, flags,
+ page_shift);
+}
+
+static inline int uv_page_out(u64 lpid, u64 dst_ra, u64 src_gpa, u64 flags,
+ u64 page_shift)
+{
+ return ucall_norets(UV_PAGE_OUT, lpid, dst_ra, src_gpa, flags,
+ page_shift);
+}
+
+static inline int uv_register_mem_slot(u64 lpid, u64 start_gpa, u64 size,
+ u64 flags, u64 slotid)
+{
+ return ucall_norets(UV_REGISTER_MEM_SLOT, lpid, start_gpa,
+ size, flags, slotid);
+}
+
+static inline int uv_unregister_mem_slot(u64 lpid, u64 slotid)
+{
+ return ucall_norets(UV_UNREGISTER_MEM_SLOT, lpid, slotid);
+}
+
+static inline int uv_page_inval(u64 lpid, u64 gpa, u64 page_shift)
+{
+ return ucall_norets(UV_PAGE_INVAL, lpid, gpa, page_shift);
+}
+
+static inline int uv_svm_terminate(u64 lpid)
+{
+ return ucall_norets(UV_SVM_TERMINATE, lpid);
+}
+
#endif /* _ASM_POWERPC_ULTRAVISOR_H */
diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile
index 4c67cc79de7c..2bfeaa13befb 100644
--- a/arch/powerpc/kvm/Makefile
+++ b/arch/powerpc/kvm/Makefile
@@ -71,6 +71,9 @@ kvm-hv-y += \
book3s_64_mmu_radix.o \
book3s_hv_nested.o
+kvm-hv-$(CONFIG_PPC_UV) += \
+ book3s_hv_uvmem.o
+
kvm-hv-$(CONFIG_PPC_TRANSACTIONAL_MEM) += \
book3s_hv_tm.o
diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c
index 2d415c36a61d..da857c8ba6e4 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_radix.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c
@@ -19,6 +19,8 @@
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/pte-walk.h>
+#include <asm/ultravisor.h>
+#include <asm/kvm_book3s_uvmem.h>
/*
* Supported radix tree geometry.
@@ -915,6 +917,9 @@ int kvmppc_book3s_radix_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
if (!(dsisr & DSISR_PRTABLE_FAULT))
gpa |= ea & 0xfff;
+ if (kvm->arch.secure_guest & KVMPPC_SECURE_INIT_DONE)
+ return kvmppc_send_page_to_uv(kvm, gfn);
+
/* Get the corresponding memslot */
memslot = gfn_to_memslot(kvm, gfn);
@@ -972,6 +977,11 @@ int kvm_unmap_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
unsigned long gpa = gfn << PAGE_SHIFT;
unsigned int shift;
+ if (kvm->arch.secure_guest & KVMPPC_SECURE_INIT_DONE) {
+ uv_page_inval(kvm->arch.lpid, gpa, PAGE_SHIFT);
+ return 0;
+ }
+
ptep = __find_linux_pte(kvm->arch.pgtable, gpa, NULL, &shift);
if (ptep && pte_present(*ptep))
kvmppc_unmap_pte(kvm, ptep, gpa, shift, memslot,
@@ -989,6 +999,9 @@ int kvm_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
int ref = 0;
unsigned long old, *rmapp;
+ if (kvm->arch.secure_guest & KVMPPC_SECURE_INIT_DONE)
+ return ref;
+
ptep = __find_linux_pte(kvm->arch.pgtable, gpa, NULL, &shift);
if (ptep && pte_present(*ptep) && pte_young(*ptep)) {
old = kvmppc_radix_update_pte(kvm, ptep, _PAGE_ACCESSED, 0,
@@ -1013,6 +1026,9 @@ int kvm_test_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
unsigned int shift;
int ref = 0;
+ if (kvm->arch.secure_guest & KVMPPC_SECURE_INIT_DONE)
+ return ref;
+
ptep = __find_linux_pte(kvm->arch.pgtable, gpa, NULL, &shift);
if (ptep && pte_present(*ptep) && pte_young(*ptep))
ref = 1;
@@ -1030,6 +1046,9 @@ static int kvm_radix_test_clear_dirty(struct kvm *kvm,
int ret = 0;
unsigned long old, *rmapp;
+ if (kvm->arch.secure_guest & KVMPPC_SECURE_INIT_DONE)
+ return ret;
+
ptep = __find_linux_pte(kvm->arch.pgtable, gpa, NULL, &shift);
if (ptep && pte_present(*ptep) && pte_dirty(*ptep)) {
ret = 1;
@@ -1082,6 +1101,12 @@ void kvmppc_radix_flush_memslot(struct kvm *kvm,
unsigned long gpa;
unsigned int shift;
+ if (kvm->arch.secure_guest & KVMPPC_SECURE_INIT_START)
+ kvmppc_uvmem_drop_pages(memslot, kvm);
+
+ if (kvm->arch.secure_guest & KVMPPC_SECURE_INIT_DONE)
+ return;
+
gpa = memslot->base_gfn << PAGE_SHIFT;
spin_lock(&kvm->mmu_lock);
for (n = memslot->npages; n; --n) {
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index ec5c0379296a..dc53578193ee 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -72,6 +72,9 @@
#include <asm/xics.h>
#include <asm/xive.h>
#include <asm/hw_breakpoint.h>
+#include <asm/kvm_host.h>
+#include <asm/kvm_book3s_uvmem.h>
+#include <asm/ultravisor.h>
#include "book3s.h"
@@ -1070,6 +1073,25 @@ int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6));
break;
+ case H_SVM_PAGE_IN:
+ ret = kvmppc_h_svm_page_in(vcpu->kvm,
+ kvmppc_get_gpr(vcpu, 4),
+ kvmppc_get_gpr(vcpu, 5),
+ kvmppc_get_gpr(vcpu, 6));
+ break;
+ case H_SVM_PAGE_OUT:
+ ret = kvmppc_h_svm_page_out(vcpu->kvm,
+ kvmppc_get_gpr(vcpu, 4),
+ kvmppc_get_gpr(vcpu, 5),
+ kvmppc_get_gpr(vcpu, 6));
+ break;
+ case H_SVM_INIT_START:
+ ret = kvmppc_h_svm_init_start(vcpu->kvm);
+ break;
+ case H_SVM_INIT_DONE:
+ ret = kvmppc_h_svm_init_done(vcpu->kvm);
+ break;
+
default:
return RESUME_HOST;
}
@@ -4494,6 +4516,29 @@ static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
if (change == KVM_MR_FLAGS_ONLY && kvm_is_radix(kvm) &&
((new->flags ^ old->flags) & KVM_MEM_LOG_DIRTY_PAGES))
kvmppc_radix_flush_memslot(kvm, old);
+ /*
+ * If UV hasn't yet called H_SVM_INIT_START, don't register memslots.
+ */
+ if (!kvm->arch.secure_guest)
+ return;
+
+ switch (change) {
+ case KVM_MR_CREATE:
+ if (kvmppc_uvmem_slot_init(kvm, new))
+ return;
+ uv_register_mem_slot(kvm->arch.lpid,
+ new->base_gfn << PAGE_SHIFT,
+ new->npages * PAGE_SIZE,
+ 0, new->id);
+ break;
+ case KVM_MR_DELETE:
+ uv_unregister_mem_slot(kvm->arch.lpid, old->id);
+ kvmppc_uvmem_slot_free(kvm, old);
+ break;
+ default:
+ /* TODO: Handle KVM_MR_MOVE */
+ break;
+ }
}
/*
@@ -4767,6 +4812,8 @@ static int kvmppc_core_init_vm_hv(struct kvm *kvm)
char buf[32];
int ret;
+ mutex_init(&kvm->arch.uvmem_lock);
+ INIT_LIST_HEAD(&kvm->arch.uvmem_pfns);
mutex_init(&kvm->arch.mmu_setup_lock);
/* Allocate the guest's logical partition ID */
@@ -4936,8 +4983,10 @@ static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
if (nesting_enabled(kvm))
kvmhv_release_all_nested(kvm);
kvm->arch.process_table = 0;
+ uv_svm_terminate(kvm->arch.lpid);
kvmhv_set_ptbl_entry(kvm->arch.lpid, 0, 0);
}
+
kvmppc_free_lpid(kvm->arch.lpid);
kvmppc_free_pimap(kvm);
@@ -5377,6 +5426,94 @@ static int kvmhv_store_to_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr,
return rc;
}
+static void unpin_vpa_reset(struct kvm *kvm, struct kvmppc_vpa *vpa)
+{
+ unpin_vpa(kvm, vpa);
+ vpa->gpa = 0;
+ vpa->pinned_addr = NULL;
+ vpa->dirty = false;
+ vpa->update_pending = 0;
+}
+
+/*
+ * IOCTL handler to turn off secure mode of guest
+ *
+ * - Release all device pages
+ * - Issue ucall to terminate the guest on the UV side
+ * - Unpin the VPA pages.
+ * - Reinit the partition scoped page tables
+ */
+static int kvmhv_svm_off(struct kvm *kvm)
+{
+ struct kvm_vcpu *vcpu;
+ int mmu_was_ready;
+ int srcu_idx;
+ int ret = 0;
+ int i;
+
+ if (!(kvm->arch.secure_guest & KVMPPC_SECURE_INIT_START))
+ return ret;
+
+ mutex_lock(&kvm->arch.mmu_setup_lock);
+ mmu_was_ready = kvm->arch.mmu_ready;
+ if (kvm->arch.mmu_ready) {
+ kvm->arch.mmu_ready = 0;
+ /* order mmu_ready vs. vcpus_running */
+ smp_mb();
+ if (atomic_read(&kvm->arch.vcpus_running)) {
+ kvm->arch.mmu_ready = 1;
+ ret = -EBUSY;
+ goto out;
+ }
+ }
+
+ srcu_idx = srcu_read_lock(&kvm->srcu);
+ for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
+ struct kvm_memory_slot *memslot;
+ struct kvm_memslots *slots = __kvm_memslots(kvm, i);
+
+ if (!slots)
+ continue;
+
+ kvm_for_each_memslot(memslot, slots) {
+ kvmppc_uvmem_drop_pages(memslot, kvm);
+ uv_unregister_mem_slot(kvm->arch.lpid, memslot->id);
+ }
+ }
+ srcu_read_unlock(&kvm->srcu, srcu_idx);
+
+ ret = uv_svm_terminate(kvm->arch.lpid);
+ if (ret != U_SUCCESS) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /*
+ * When secure guest is reset, all the guest pages are sent
+ * to UV via UV_PAGE_IN before the non-boot vcpus get a
+ * chance to run and unpin their VPA pages. Unpinning of all
+ * VPA pages is done here explicitly so that VPA pages
+ * can be migrated to the secure side.
+ *
+ * This is required to for the secure SMP guest to reboot
+ * correctly.
+ */
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ spin_lock(&vcpu->arch.vpa_update_lock);
+ unpin_vpa_reset(kvm, &vcpu->arch.dtl);
+ unpin_vpa_reset(kvm, &vcpu->arch.slb_shadow);
+ unpin_vpa_reset(kvm, &vcpu->arch.vpa);
+ spin_unlock(&vcpu->arch.vpa_update_lock);
+ }
+
+ kvmppc_setup_partition_table(kvm);
+ kvm->arch.secure_guest = 0;
+ kvm->arch.mmu_ready = mmu_was_ready;
+out:
+ mutex_unlock(&kvm->arch.mmu_setup_lock);
+ return ret;
+}
+
static struct kvmppc_ops kvm_ops_hv = {
.get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv,
.set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv,
@@ -5420,6 +5557,7 @@ static struct kvmppc_ops kvm_ops_hv = {
.enable_nested = kvmhv_enable_nested,
.load_from_eaddr = kvmhv_load_from_eaddr,
.store_to_eaddr = kvmhv_store_to_eaddr,
+ .svm_off = kvmhv_svm_off,
};
static int kvm_init_subcore_bitmap(void)
@@ -5528,11 +5666,16 @@ static int kvmppc_book3s_init_hv(void)
no_mixing_hpt_and_radix = true;
}
+ r = kvmppc_uvmem_init();
+ if (r < 0)
+ pr_err("KVM-HV: kvmppc_uvmem_init failed %d\n", r);
+
return r;
}
static void kvmppc_book3s_exit_hv(void)
{
+ kvmppc_uvmem_free();
kvmppc_free_host_rm_ops();
if (kvmppc_radix_possible())
kvmppc_radix_exit();
diff --git a/arch/powerpc/kvm/book3s_hv_uvmem.c b/arch/powerpc/kvm/book3s_hv_uvmem.c
new file mode 100644
index 000000000000..2de264fc3156
--- /dev/null
+++ b/arch/powerpc/kvm/book3s_hv_uvmem.c
@@ -0,0 +1,785 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Secure pages management: Migration of pages between normal and secure
+ * memory of KVM guests.
+ *
+ * Copyright 2018 Bharata B Rao, IBM Corp. <bharata@linux.ibm.com>
+ */
+
+/*
+ * A pseries guest can be run as secure guest on Ultravisor-enabled
+ * POWER platforms. On such platforms, this driver will be used to manage
+ * the movement of guest pages between the normal memory managed by
+ * hypervisor (HV) and secure memory managed by Ultravisor (UV).
+ *
+ * The page-in or page-out requests from UV will come to HV as hcalls and
+ * HV will call back into UV via ultracalls to satisfy these page requests.
+ *
+ * Private ZONE_DEVICE memory equal to the amount of secure memory
+ * available in the platform for running secure guests is hotplugged.
+ * Whenever a page belonging to the guest becomes secure, a page from this
+ * private device memory is used to represent and track that secure page
+ * on the HV side. Some pages (like virtio buffers, VPA pages etc) are
+ * shared between UV and HV. However such pages aren't represented by
+ * device private memory and mappings to shared memory exist in both
+ * UV and HV page tables.
+ */
+
+/*
+ * Notes on locking
+ *
+ * kvm->arch.uvmem_lock is a per-guest lock that prevents concurrent
+ * page-in and page-out requests for the same GPA. Concurrent accesses
+ * can either come via UV (guest vCPUs requesting for same page)
+ * or when HV and guest simultaneously access the same page.
+ * This mutex serializes the migration of page from HV(normal) to
+ * UV(secure) and vice versa. So the serialization points are around
+ * migrate_vma routines and page-in/out routines.
+ *
+ * Per-guest mutex comes with a cost though. Mainly it serializes the
+ * fault path as page-out can occur when HV faults on accessing secure
+ * guest pages. Currently UV issues page-in requests for all the guest
+ * PFNs one at a time during early boot (UV_ESM uvcall), so this is
+ * not a cause for concern. Also currently the number of page-outs caused
+ * by HV touching secure pages is very very low. If an when UV supports
+ * overcommitting, then we might see concurrent guest driven page-outs.
+ *
+ * Locking order
+ *
+ * 1. kvm->srcu - Protects KVM memslots
+ * 2. kvm->mm->mmap_sem - find_vma, migrate_vma_pages and helpers, ksm_madvise
+ * 3. kvm->arch.uvmem_lock - protects read/writes to uvmem slots thus acting
+ * as sync-points for page-in/out
+ */
+
+/*
+ * Notes on page size
+ *
+ * Currently UV uses 2MB mappings internally, but will issue H_SVM_PAGE_IN
+ * and H_SVM_PAGE_OUT hcalls in PAGE_SIZE(64K) granularity. HV tracks
+ * secure GPAs at 64K page size and maintains one device PFN for each
+ * 64K secure GPA. UV_PAGE_IN and UV_PAGE_OUT calls by HV are also issued
+ * for 64K page at a time.
+ *
+ * HV faulting on secure pages: When HV touches any secure page, it
+ * faults and issues a UV_PAGE_OUT request with 64K page size. Currently
+ * UV splits and remaps the 2MB page if necessary and copies out the
+ * required 64K page contents.
+ *
+ * Shared pages: Whenever guest shares a secure page, UV will split and
+ * remap the 2MB page if required and issue H_SVM_PAGE_IN with 64K page size.
+ *
+ * HV invalidating a page: When a regular page belonging to secure
+ * guest gets unmapped, HV informs UV with UV_PAGE_INVAL of 64K
+ * page size. Using 64K page size is correct here because any non-secure
+ * page will essentially be of 64K page size. Splitting by UV during sharing
+ * and page-out ensures this.
+ *
+ * Page fault handling: When HV handles page fault of a page belonging
+ * to secure guest, it sends that to UV with a 64K UV_PAGE_IN request.
+ * Using 64K size is correct here too as UV would have split the 2MB page
+ * into 64k mappings and would have done page-outs earlier.
+ *
+ * In summary, the current secure pages handling code in HV assumes
+ * 64K page size and in fact fails any page-in/page-out requests of
+ * non-64K size upfront. If and when UV starts supporting multiple
+ * page-sizes, we need to break this assumption.
+ */
+
+#include <linux/pagemap.h>
+#include <linux/migrate.h>
+#include <linux/kvm_host.h>
+#include <linux/ksm.h>
+#include <asm/ultravisor.h>
+#include <asm/mman.h>
+#include <asm/kvm_ppc.h>
+
+static struct dev_pagemap kvmppc_uvmem_pgmap;
+static unsigned long *kvmppc_uvmem_bitmap;
+static DEFINE_SPINLOCK(kvmppc_uvmem_bitmap_lock);
+
+#define KVMPPC_UVMEM_PFN (1UL << 63)
+
+struct kvmppc_uvmem_slot {
+ struct list_head list;
+ unsigned long nr_pfns;
+ unsigned long base_pfn;
+ unsigned long *pfns;
+};
+
+struct kvmppc_uvmem_page_pvt {
+ struct kvm *kvm;
+ unsigned long gpa;
+ bool skip_page_out;
+};
+
+int kvmppc_uvmem_slot_init(struct kvm *kvm, const struct kvm_memory_slot *slot)
+{
+ struct kvmppc_uvmem_slot *p;
+
+ p = kzalloc(sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+ p->pfns = vzalloc(array_size(slot->npages, sizeof(*p->pfns)));
+ if (!p->pfns) {
+ kfree(p);
+ return -ENOMEM;
+ }
+ p->nr_pfns = slot->npages;
+ p->base_pfn = slot->base_gfn;
+
+ mutex_lock(&kvm->arch.uvmem_lock);
+ list_add(&p->list, &kvm->arch.uvmem_pfns);
+ mutex_unlock(&kvm->arch.uvmem_lock);
+
+ return 0;
+}
+
+/*
+ * All device PFNs are already released by the time we come here.
+ */
+void kvmppc_uvmem_slot_free(struct kvm *kvm, const struct kvm_memory_slot *slot)
+{
+ struct kvmppc_uvmem_slot *p, *next;
+
+ mutex_lock(&kvm->arch.uvmem_lock);
+ list_for_each_entry_safe(p, next, &kvm->arch.uvmem_pfns, list) {
+ if (p->base_pfn == slot->base_gfn) {
+ vfree(p->pfns);
+ list_del(&p->list);
+ kfree(p);
+ break;
+ }
+ }
+ mutex_unlock(&kvm->arch.uvmem_lock);
+}
+
+static void kvmppc_uvmem_pfn_insert(unsigned long gfn, unsigned long uvmem_pfn,
+ struct kvm *kvm)
+{
+ struct kvmppc_uvmem_slot *p;
+
+ list_for_each_entry(p, &kvm->arch.uvmem_pfns, list) {
+ if (gfn >= p->base_pfn && gfn < p->base_pfn + p->nr_pfns) {
+ unsigned long index = gfn - p->base_pfn;
+
+ p->pfns[index] = uvmem_pfn | KVMPPC_UVMEM_PFN;
+ return;
+ }
+ }
+}
+
+static void kvmppc_uvmem_pfn_remove(unsigned long gfn, struct kvm *kvm)
+{
+ struct kvmppc_uvmem_slot *p;
+
+ list_for_each_entry(p, &kvm->arch.uvmem_pfns, list) {
+ if (gfn >= p->base_pfn && gfn < p->base_pfn + p->nr_pfns) {
+ p->pfns[gfn - p->base_pfn] = 0;
+ return;
+ }
+ }
+}
+
+static bool kvmppc_gfn_is_uvmem_pfn(unsigned long gfn, struct kvm *kvm,
+ unsigned long *uvmem_pfn)
+{
+ struct kvmppc_uvmem_slot *p;
+
+ list_for_each_entry(p, &kvm->arch.uvmem_pfns, list) {
+ if (gfn >= p->base_pfn && gfn < p->base_pfn + p->nr_pfns) {
+ unsigned long index = gfn - p->base_pfn;
+
+ if (p->pfns[index] & KVMPPC_UVMEM_PFN) {
+ if (uvmem_pfn)
+ *uvmem_pfn = p->pfns[index] &
+ ~KVMPPC_UVMEM_PFN;
+ return true;
+ } else
+ return false;
+ }
+ }
+ return false;
+}
+
+unsigned long kvmppc_h_svm_init_start(struct kvm *kvm)
+{
+ struct kvm_memslots *slots;
+ struct kvm_memory_slot *memslot;
+ int ret = H_SUCCESS;
+ int srcu_idx;
+
+ if (!kvmppc_uvmem_bitmap)
+ return H_UNSUPPORTED;
+
+ /* Only radix guests can be secure guests */
+ if (!kvm_is_radix(kvm))
+ return H_UNSUPPORTED;
+
+ srcu_idx = srcu_read_lock(&kvm->srcu);
+ slots = kvm_memslots(kvm);
+ kvm_for_each_memslot(memslot, slots) {
+ if (kvmppc_uvmem_slot_init(kvm, memslot)) {
+ ret = H_PARAMETER;
+ goto out;
+ }
+ ret = uv_register_mem_slot(kvm->arch.lpid,
+ memslot->base_gfn << PAGE_SHIFT,
+ memslot->npages * PAGE_SIZE,
+ 0, memslot->id);
+ if (ret < 0) {
+ kvmppc_uvmem_slot_free(kvm, memslot);
+ ret = H_PARAMETER;
+ goto out;
+ }
+ }
+ kvm->arch.secure_guest |= KVMPPC_SECURE_INIT_START;
+out:
+ srcu_read_unlock(&kvm->srcu, srcu_idx);
+ return ret;
+}
+
+unsigned long kvmppc_h_svm_init_done(struct kvm *kvm)
+{
+ if (!(kvm->arch.secure_guest & KVMPPC_SECURE_INIT_START))
+ return H_UNSUPPORTED;
+
+ kvm->arch.secure_guest |= KVMPPC_SECURE_INIT_DONE;
+ pr_info("LPID %d went secure\n", kvm->arch.lpid);
+ return H_SUCCESS;
+}
+
+/*
+ * Drop device pages that we maintain for the secure guest
+ *
+ * We first mark the pages to be skipped from UV_PAGE_OUT when there
+ * is HV side fault on these pages. Next we *get* these pages, forcing
+ * fault on them, do fault time migration to replace the device PTEs in
+ * QEMU page table with normal PTEs from newly allocated pages.
+ */
+void kvmppc_uvmem_drop_pages(const struct kvm_memory_slot *free,
+ struct kvm *kvm)
+{
+ int i;
+ struct kvmppc_uvmem_page_pvt *pvt;
+ unsigned long pfn, uvmem_pfn;
+ unsigned long gfn = free->base_gfn;
+
+ for (i = free->npages; i; --i, ++gfn) {
+ struct page *uvmem_page;
+
+ mutex_lock(&kvm->arch.uvmem_lock);
+ if (!kvmppc_gfn_is_uvmem_pfn(gfn, kvm, &uvmem_pfn)) {
+ mutex_unlock(&kvm->arch.uvmem_lock);
+ continue;
+ }
+
+ uvmem_page = pfn_to_page(uvmem_pfn);
+ pvt = uvmem_page->zone_device_data;
+ pvt->skip_page_out = true;
+ mutex_unlock(&kvm->arch.uvmem_lock);
+
+ pfn = gfn_to_pfn(kvm, gfn);
+ if (is_error_noslot_pfn(pfn))
+ continue;
+ kvm_release_pfn_clean(pfn);
+ }
+}
+
+/*
+ * Get a free device PFN from the pool
+ *
+ * Called when a normal page is moved to secure memory (UV_PAGE_IN). Device
+ * PFN will be used to keep track of the secure page on HV side.
+ *
+ * Called with kvm->arch.uvmem_lock held
+ */
+static struct page *kvmppc_uvmem_get_page(unsigned long gpa, struct kvm *kvm)
+{
+ struct page *dpage = NULL;
+ unsigned long bit, uvmem_pfn;
+ struct kvmppc_uvmem_page_pvt *pvt;
+ unsigned long pfn_last, pfn_first;
+
+ pfn_first = kvmppc_uvmem_pgmap.res.start >> PAGE_SHIFT;
+ pfn_last = pfn_first +
+ (resource_size(&kvmppc_uvmem_pgmap.res) >> PAGE_SHIFT);
+
+ spin_lock(&kvmppc_uvmem_bitmap_lock);
+ bit = find_first_zero_bit(kvmppc_uvmem_bitmap,
+ pfn_last - pfn_first);
+ if (bit >= (pfn_last - pfn_first))
+ goto out;
+ bitmap_set(kvmppc_uvmem_bitmap, bit, 1);
+ spin_unlock(&kvmppc_uvmem_bitmap_lock);
+
+ pvt = kzalloc(sizeof(*pvt), GFP_KERNEL);
+ if (!pvt)
+ goto out_clear;
+
+ uvmem_pfn = bit + pfn_first;
+ kvmppc_uvmem_pfn_insert(gpa >> PAGE_SHIFT, uvmem_pfn, kvm);
+
+ pvt->gpa = gpa;
+ pvt->kvm = kvm;
+
+ dpage = pfn_to_page(uvmem_pfn);
+ dpage->zone_device_data = pvt;
+ get_page(dpage);
+ lock_page(dpage);
+ return dpage;
+out_clear:
+ spin_lock(&kvmppc_uvmem_bitmap_lock);
+ bitmap_clear(kvmppc_uvmem_bitmap, bit, 1);
+out:
+ spin_unlock(&kvmppc_uvmem_bitmap_lock);
+ return NULL;
+}
+
+/*
+ * Alloc a PFN from private device memory pool and copy page from normal
+ * memory to secure memory using UV_PAGE_IN uvcall.
+ */
+static int
+kvmppc_svm_page_in(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end, unsigned long gpa, struct kvm *kvm,
+ unsigned long page_shift, bool *downgrade)
+{
+ unsigned long src_pfn, dst_pfn = 0;
+ struct migrate_vma mig;
+ struct page *spage;
+ unsigned long pfn;
+ struct page *dpage;
+ int ret = 0;
+
+ memset(&mig, 0, sizeof(mig));
+ mig.vma = vma;
+ mig.start = start;
+ mig.end = end;
+ mig.src = &src_pfn;
+ mig.dst = &dst_pfn;
+
+ /*
+ * We come here with mmap_sem write lock held just for
+ * ksm_madvise(), otherwise we only need read mmap_sem.
+ * Hence downgrade to read lock once ksm_madvise() is done.
+ */
+ ret = ksm_madvise(vma, vma->vm_start, vma->vm_end,
+ MADV_UNMERGEABLE, &vma->vm_flags);
+ downgrade_write(&kvm->mm->mmap_sem);
+ *downgrade = true;
+ if (ret)
+ return ret;
+
+ ret = migrate_vma_setup(&mig);
+ if (ret)
+ return ret;
+
+ if (!(*mig.src & MIGRATE_PFN_MIGRATE)) {
+ ret = -1;
+ goto out_finalize;
+ }
+
+ dpage = kvmppc_uvmem_get_page(gpa, kvm);
+ if (!dpage) {
+ ret = -1;
+ goto out_finalize;
+ }
+
+ pfn = *mig.src >> MIGRATE_PFN_SHIFT;
+ spage = migrate_pfn_to_page(*mig.src);
+ if (spage)
+ uv_page_in(kvm->arch.lpid, pfn << page_shift, gpa, 0,
+ page_shift);
+
+ *mig.dst = migrate_pfn(page_to_pfn(dpage)) | MIGRATE_PFN_LOCKED;
+ migrate_vma_pages(&mig);
+out_finalize:
+ migrate_vma_finalize(&mig);
+ return ret;
+}
+
+/*
+ * Shares the page with HV, thus making it a normal page.
+ *
+ * - If the page is already secure, then provision a new page and share
+ * - If the page is a normal page, share the existing page
+ *
+ * In the former case, uses dev_pagemap_ops.migrate_to_ram handler
+ * to unmap the device page from QEMU's page tables.
+ */
+static unsigned long
+kvmppc_share_page(struct kvm *kvm, unsigned long gpa, unsigned long page_shift)
+{
+
+ int ret = H_PARAMETER;
+ struct page *uvmem_page;
+ struct kvmppc_uvmem_page_pvt *pvt;
+ unsigned long pfn;
+ unsigned long gfn = gpa >> page_shift;
+ int srcu_idx;
+ unsigned long uvmem_pfn;
+
+ srcu_idx = srcu_read_lock(&kvm->srcu);
+ mutex_lock(&kvm->arch.uvmem_lock);
+ if (kvmppc_gfn_is_uvmem_pfn(gfn, kvm, &uvmem_pfn)) {
+ uvmem_page = pfn_to_page(uvmem_pfn);
+ pvt = uvmem_page->zone_device_data;
+ pvt->skip_page_out = true;
+ }
+
+retry:
+ mutex_unlock(&kvm->arch.uvmem_lock);
+ pfn = gfn_to_pfn(kvm, gfn);
+ if (is_error_noslot_pfn(pfn))
+ goto out;
+
+ mutex_lock(&kvm->arch.uvmem_lock);
+ if (kvmppc_gfn_is_uvmem_pfn(gfn, kvm, &uvmem_pfn)) {
+ uvmem_page = pfn_to_page(uvmem_pfn);
+ pvt = uvmem_page->zone_device_data;
+ pvt->skip_page_out = true;
+ kvm_release_pfn_clean(pfn);
+ goto retry;
+ }
+
+ if (!uv_page_in(kvm->arch.lpid, pfn << page_shift, gpa, 0, page_shift))
+ ret = H_SUCCESS;
+ kvm_release_pfn_clean(pfn);
+ mutex_unlock(&kvm->arch.uvmem_lock);
+out:
+ srcu_read_unlock(&kvm->srcu, srcu_idx);
+ return ret;
+}
+
+/*
+ * H_SVM_PAGE_IN: Move page from normal memory to secure memory.
+ *
+ * H_PAGE_IN_SHARED flag makes the page shared which means that the same
+ * memory in is visible from both UV and HV.
+ */
+unsigned long
+kvmppc_h_svm_page_in(struct kvm *kvm, unsigned long gpa,
+ unsigned long flags, unsigned long page_shift)
+{
+ bool downgrade = false;
+ unsigned long start, end;
+ struct vm_area_struct *vma;
+ int srcu_idx;
+ unsigned long gfn = gpa >> page_shift;
+ int ret;
+
+ if (!(kvm->arch.secure_guest & KVMPPC_SECURE_INIT_START))
+ return H_UNSUPPORTED;
+
+ if (page_shift != PAGE_SHIFT)
+ return H_P3;
+
+ if (flags & ~H_PAGE_IN_SHARED)
+ return H_P2;
+
+ if (flags & H_PAGE_IN_SHARED)
+ return kvmppc_share_page(kvm, gpa, page_shift);
+
+ ret = H_PARAMETER;
+ srcu_idx = srcu_read_lock(&kvm->srcu);
+ down_write(&kvm->mm->mmap_sem);
+
+ start = gfn_to_hva(kvm, gfn);
+ if (kvm_is_error_hva(start))
+ goto out;
+
+ mutex_lock(&kvm->arch.uvmem_lock);
+ /* Fail the page-in request of an already paged-in page */
+ if (kvmppc_gfn_is_uvmem_pfn(gfn, kvm, NULL))
+ goto out_unlock;
+
+ end = start + (1UL << page_shift);
+ vma = find_vma_intersection(kvm->mm, start, end);
+ if (!vma || vma->vm_start > start || vma->vm_end < end)
+ goto out_unlock;
+
+ if (!kvmppc_svm_page_in(vma, start, end, gpa, kvm, page_shift,
+ &downgrade))
+ ret = H_SUCCESS;
+out_unlock:
+ mutex_unlock(&kvm->arch.uvmem_lock);
+out:
+ if (downgrade)
+ up_read(&kvm->mm->mmap_sem);
+ else
+ up_write(&kvm->mm->mmap_sem);
+ srcu_read_unlock(&kvm->srcu, srcu_idx);
+ return ret;
+}
+
+/*
+ * Provision a new page on HV side and copy over the contents
+ * from secure memory using UV_PAGE_OUT uvcall.
+ */
+static int
+kvmppc_svm_page_out(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end, unsigned long page_shift,
+ struct kvm *kvm, unsigned long gpa)
+{
+ unsigned long src_pfn, dst_pfn = 0;
+ struct migrate_vma mig;
+ struct page *dpage, *spage;
+ struct kvmppc_uvmem_page_pvt *pvt;
+ unsigned long pfn;
+ int ret = U_SUCCESS;
+
+ memset(&mig, 0, sizeof(mig));
+ mig.vma = vma;
+ mig.start = start;
+ mig.end = end;
+ mig.src = &src_pfn;
+ mig.dst = &dst_pfn;
+
+ mutex_lock(&kvm->arch.uvmem_lock);
+ /* The requested page is already paged-out, nothing to do */
+ if (!kvmppc_gfn_is_uvmem_pfn(gpa >> page_shift, kvm, NULL))
+ goto out;
+
+ ret = migrate_vma_setup(&mig);
+ if (ret)
+ return ret;
+
+ spage = migrate_pfn_to_page(*mig.src);
+ if (!spage || !(*mig.src & MIGRATE_PFN_MIGRATE))
+ goto out_finalize;
+
+ if (!is_zone_device_page(spage))
+ goto out_finalize;
+
+ dpage = alloc_page_vma(GFP_HIGHUSER, vma, start);
+ if (!dpage) {
+ ret = -1;
+ goto out_finalize;
+ }
+
+ lock_page(dpage);
+ pvt = spage->zone_device_data;
+ pfn = page_to_pfn(dpage);
+
+ /*
+ * This function is used in two cases:
+ * - When HV touches a secure page, for which we do UV_PAGE_OUT
+ * - When a secure page is converted to shared page, we *get*
+ * the page to essentially unmap the device page. In this
+ * case we skip page-out.
+ */
+ if (!pvt->skip_page_out)
+ ret = uv_page_out(kvm->arch.lpid, pfn << page_shift,
+ gpa, 0, page_shift);
+
+ if (ret == U_SUCCESS)
+ *mig.dst = migrate_pfn(pfn) | MIGRATE_PFN_LOCKED;
+ else {
+ unlock_page(dpage);
+ __free_page(dpage);
+ goto out_finalize;
+ }
+
+ migrate_vma_pages(&mig);
+out_finalize:
+ migrate_vma_finalize(&mig);
+out:
+ mutex_unlock(&kvm->arch.uvmem_lock);
+ return ret;
+}
+
+/*
+ * Fault handler callback that gets called when HV touches any page that
+ * has been moved to secure memory, we ask UV to give back the page by
+ * issuing UV_PAGE_OUT uvcall.
+ *
+ * This eventually results in dropping of device PFN and the newly
+ * provisioned page/PFN gets populated in QEMU page tables.
+ */
+static vm_fault_t kvmppc_uvmem_migrate_to_ram(struct vm_fault *vmf)
+{
+ struct kvmppc_uvmem_page_pvt *pvt = vmf->page->zone_device_data;
+
+ if (kvmppc_svm_page_out(vmf->vma, vmf->address,
+ vmf->address + PAGE_SIZE, PAGE_SHIFT,
+ pvt->kvm, pvt->gpa))
+ return VM_FAULT_SIGBUS;
+ else
+ return 0;
+}
+
+/*
+ * Release the device PFN back to the pool
+ *
+ * Gets called when secure page becomes a normal page during H_SVM_PAGE_OUT.
+ * Gets called with kvm->arch.uvmem_lock held.
+ */
+static void kvmppc_uvmem_page_free(struct page *page)
+{
+ unsigned long pfn = page_to_pfn(page) -
+ (kvmppc_uvmem_pgmap.res.start >> PAGE_SHIFT);
+ struct kvmppc_uvmem_page_pvt *pvt;
+
+ spin_lock(&kvmppc_uvmem_bitmap_lock);
+ bitmap_clear(kvmppc_uvmem_bitmap, pfn, 1);
+ spin_unlock(&kvmppc_uvmem_bitmap_lock);
+
+ pvt = page->zone_device_data;
+ page->zone_device_data = NULL;
+ kvmppc_uvmem_pfn_remove(pvt->gpa >> PAGE_SHIFT, pvt->kvm);
+ kfree(pvt);
+}
+
+static const struct dev_pagemap_ops kvmppc_uvmem_ops = {
+ .page_free = kvmppc_uvmem_page_free,
+ .migrate_to_ram = kvmppc_uvmem_migrate_to_ram,
+};
+
+/*
+ * H_SVM_PAGE_OUT: Move page from secure memory to normal memory.
+ */
+unsigned long
+kvmppc_h_svm_page_out(struct kvm *kvm, unsigned long gpa,
+ unsigned long flags, unsigned long page_shift)
+{
+ unsigned long gfn = gpa >> page_shift;
+ unsigned long start, end;
+ struct vm_area_struct *vma;
+ int srcu_idx;
+ int ret;
+
+ if (!(kvm->arch.secure_guest & KVMPPC_SECURE_INIT_START))
+ return H_UNSUPPORTED;
+
+ if (page_shift != PAGE_SHIFT)
+ return H_P3;
+
+ if (flags)
+ return H_P2;
+
+ ret = H_PARAMETER;
+ srcu_idx = srcu_read_lock(&kvm->srcu);
+ down_read(&kvm->mm->mmap_sem);
+ start = gfn_to_hva(kvm, gfn);
+ if (kvm_is_error_hva(start))
+ goto out;
+
+ end = start + (1UL << page_shift);
+ vma = find_vma_intersection(kvm->mm, start, end);
+ if (!vma || vma->vm_start > start || vma->vm_end < end)
+ goto out;
+
+ if (!kvmppc_svm_page_out(vma, start, end, page_shift, kvm, gpa))
+ ret = H_SUCCESS;
+out:
+ up_read(&kvm->mm->mmap_sem);
+ srcu_read_unlock(&kvm->srcu, srcu_idx);
+ return ret;
+}
+
+int kvmppc_send_page_to_uv(struct kvm *kvm, unsigned long gfn)
+{
+ unsigned long pfn;
+ int ret = U_SUCCESS;
+
+ pfn = gfn_to_pfn(kvm, gfn);
+ if (is_error_noslot_pfn(pfn))
+ return -EFAULT;
+
+ mutex_lock(&kvm->arch.uvmem_lock);
+ if (kvmppc_gfn_is_uvmem_pfn(gfn, kvm, NULL))
+ goto out;
+
+ ret = uv_page_in(kvm->arch.lpid, pfn << PAGE_SHIFT, gfn << PAGE_SHIFT,
+ 0, PAGE_SHIFT);
+out:
+ kvm_release_pfn_clean(pfn);
+ mutex_unlock(&kvm->arch.uvmem_lock);
+ return (ret == U_SUCCESS) ? RESUME_GUEST : -EFAULT;
+}
+
+static u64 kvmppc_get_secmem_size(void)
+{
+ struct device_node *np;
+ int i, len;
+ const __be32 *prop;
+ u64 size = 0;
+
+ np = of_find_compatible_node(NULL, NULL, "ibm,uv-firmware");
+ if (!np)
+ goto out;
+
+ prop = of_get_property(np, "secure-memory-ranges", &len);
+ if (!prop)
+ goto out_put;
+
+ for (i = 0; i < len / (sizeof(*prop) * 4); i++)
+ size += of_read_number(prop + (i * 4) + 2, 2);
+
+out_put:
+ of_node_put(np);
+out:
+ return size;
+}
+
+int kvmppc_uvmem_init(void)
+{
+ int ret = 0;
+ unsigned long size;
+ struct resource *res;
+ void *addr;
+ unsigned long pfn_last, pfn_first;
+
+ size = kvmppc_get_secmem_size();
+ if (!size) {
+ /*
+ * Don't fail the initialization of kvm-hv module if
+ * the platform doesn't export ibm,uv-firmware node.
+ * Let normal guests run on such PEF-disabled platform.
+ */
+ pr_info("KVMPPC-UVMEM: No support for secure guests\n");
+ goto out;
+ }
+
+ res = request_free_mem_region(&iomem_resource, size, "kvmppc_uvmem");
+ if (IS_ERR(res)) {
+ ret = PTR_ERR(res);
+ goto out;
+ }
+
+ kvmppc_uvmem_pgmap.type = MEMORY_DEVICE_PRIVATE;
+ kvmppc_uvmem_pgmap.res = *res;
+ kvmppc_uvmem_pgmap.ops = &kvmppc_uvmem_ops;
+ addr = memremap_pages(&kvmppc_uvmem_pgmap, NUMA_NO_NODE);
+ if (IS_ERR(addr)) {
+ ret = PTR_ERR(addr);
+ goto out_free_region;
+ }
+
+ pfn_first = res->start >> PAGE_SHIFT;
+ pfn_last = pfn_first + (resource_size(res) >> PAGE_SHIFT);
+ kvmppc_uvmem_bitmap = kcalloc(BITS_TO_LONGS(pfn_last - pfn_first),
+ sizeof(unsigned long), GFP_KERNEL);
+ if (!kvmppc_uvmem_bitmap) {
+ ret = -ENOMEM;
+ goto out_unmap;
+ }
+
+ pr_info("KVMPPC-UVMEM: Secure Memory size 0x%lx\n", size);
+ return ret;
+out_unmap:
+ memunmap_pages(&kvmppc_uvmem_pgmap);
+out_free_region:
+ release_mem_region(res->start, size);
+out:
+ return ret;
+}
+
+void kvmppc_uvmem_free(void)
+{
+ memunmap_pages(&kvmppc_uvmem_pgmap);
+ release_mem_region(kvmppc_uvmem_pgmap.res.start,
+ resource_size(&kvmppc_uvmem_pgmap.res));
+ kfree(kvmppc_uvmem_bitmap);
+}
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 9e085e931d74..416fb3d2a1d0 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -31,6 +31,8 @@
#include <asm/hvcall.h>
#include <asm/plpar_wrappers.h>
#endif
+#include <asm/ultravisor.h>
+#include <asm/kvm_host.h>
#include "timing.h"
#include "irq.h"
@@ -2413,6 +2415,16 @@ long kvm_arch_vm_ioctl(struct file *filp,
r = -EFAULT;
break;
}
+ case KVM_PPC_SVM_OFF: {
+ struct kvm *kvm = filp->private_data;
+
+ r = 0;
+ if (!kvm->arch.kvm_ops->svm_off)
+ goto out;
+
+ r = kvm->arch.kvm_ops->svm_off(kvm);
+ break;
+ }
default: {
struct kvm *kvm = filp->private_data;
r = kvm->arch.kvm_ops->arch_vm_ioctl(filp, ioctl, arg);
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index c0aa07487eb8..cfafa320a8cf 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -504,7 +504,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_entry2 *entry, u32 function,
r = -E2BIG;
- if (*nent >= maxnent)
+ if (WARN_ON(*nent >= maxnent))
goto out;
do_host_cpuid(entry, function, 0);
@@ -778,6 +778,11 @@ static inline int __do_cpuid_func(struct kvm_cpuid_entry2 *entry, u32 function,
case 0x8000001a:
case 0x8000001e:
break;
+ /* Support memory encryption cpuid if host supports it */
+ case 0x8000001F:
+ if (!boot_cpu_has(X86_FEATURE_SEV))
+ entry->eax = entry->ebx = entry->ecx = entry->edx = 0;
+ break;
/*Add support for Centaur's CPUID instruction*/
case 0xC0000000:
/*Just support up to 0xC0000004 now*/
@@ -810,6 +815,9 @@ out:
static int do_cpuid_func(struct kvm_cpuid_entry2 *entry, u32 func,
int *nent, int maxnent, unsigned int type)
{
+ if (*nent >= maxnent)
+ return -E2BIG;
+
if (type == KVM_GET_EMULATED_CPUID)
return __do_cpuid_func_emulated(entry, func, nent, maxnent);
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 362e874297e4..122d4ce3b1ab 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5958,13 +5958,6 @@ static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
if (npt_enabled)
entry->edx |= F(NPT);
- break;
- case 0x8000001F:
- /* Support memory encryption cpuid if host supports it */
- if (boot_cpu_has(X86_FEATURE_SEV))
- cpuid(0x8000001f, &entry->eax, &entry->ebx,
- &entry->ecx, &entry->edx);
-
}
}
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 1b9ab4166397..e3394c839dea 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6666,7 +6666,6 @@ static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
free_vpid(vmx->vpid);
nested_vmx_free_vcpu(vcpu);
free_loaded_vmcs(vmx->loaded_vmcs);
- kfree(vmx->guest_msrs);
kvm_vcpu_uninit(vcpu);
kmem_cache_free(x86_fpu_cache, vmx->vcpu.arch.user_fpu);
kmem_cache_free(x86_fpu_cache, vmx->vcpu.arch.guest_fpu);
@@ -6723,12 +6722,7 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
goto uninit_vcpu;
}
- vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL_ACCOUNT);
- BUILD_BUG_ON(ARRAY_SIZE(vmx_msr_index) * sizeof(vmx->guest_msrs[0])
- > PAGE_SIZE);
-
- if (!vmx->guest_msrs)
- goto free_pml;
+ BUILD_BUG_ON(ARRAY_SIZE(vmx_msr_index) != NR_SHARED_MSRS);
for (i = 0; i < ARRAY_SIZE(vmx_msr_index); ++i) {
u32 index = vmx_msr_index[i];
@@ -6760,7 +6754,7 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
err = alloc_loaded_vmcs(&vmx->vmcs01);
if (err < 0)
- goto free_msrs;
+ goto free_pml;
msr_bitmap = vmx->vmcs01.msr_bitmap;
vmx_disable_intercept_for_msr(msr_bitmap, MSR_IA32_TSC, MSR_TYPE_R);
@@ -6822,8 +6816,6 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
free_vmcs:
free_loaded_vmcs(vmx->loaded_vmcs);
-free_msrs:
- kfree(vmx->guest_msrs);
free_pml:
vmx_destroy_pml_buffer(vmx);
uninit_vcpu:
diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
index 7c1b978b2df4..a4f7f737c5d4 100644
--- a/arch/x86/kvm/vmx/vmx.h
+++ b/arch/x86/kvm/vmx/vmx.h
@@ -22,6 +22,12 @@ extern u32 get_umwait_control_msr(void);
#define X2APIC_MSR(r) (APIC_BASE_MSR + ((r) >> 4))
+#ifdef CONFIG_X86_64
+#define NR_SHARED_MSRS 7
+#else
+#define NR_SHARED_MSRS 4
+#endif
+
#define NR_LOADSTORE_MSRS 8
struct vmx_msrs {
@@ -206,7 +212,7 @@ struct vcpu_vmx {
u32 idt_vectoring_info;
ulong rflags;
- struct shared_msr_entry *guest_msrs;
+ struct shared_msr_entry guest_msrs[NR_SHARED_MSRS];
int nmsrs;
int save_nmsrs;
bool guest_msrs_ready;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index e6f17c8e2dba..f0a16b4adbbd 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1348,6 +1348,7 @@ struct kvm_s390_ucas_mapping {
#define KVM_PPC_GET_CPU_CHAR _IOR(KVMIO, 0xb1, struct kvm_ppc_cpu_char)
/* Available with KVM_CAP_PMU_EVENT_FILTER */
#define KVM_SET_PMU_EVENT_FILTER _IOW(KVMIO, 0xb2, struct kvm_pmu_event_filter)
+#define KVM_PPC_SVM_OFF _IO(KVMIO, 0xb3)
/* ioctl for vm fd */
#define KVM_CREATE_DEVICE _IOWR(KVMIO, 0xe0, struct kvm_create_device)
diff --git a/mm/ksm.c b/mm/ksm.c
index 7905934cd3ad..d17c7d57d0d8 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -2478,6 +2478,7 @@ int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
return 0;
}
+EXPORT_SYMBOL_GPL(ksm_madvise);
int __ksm_enter(struct mm_struct *mm)
{
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 23:09:27 +0000