From: Ashish Kalra <Ashish.Kalra@amd.com>
To: pbonzini@redhat.com
Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
rkrcmar@redhat.com, joro@8bytes.org, bp@suse.de,
thomas.lendacky@amd.com, x86@kernel.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, srutherford@google.com,
venu.busireddy@oracle.com, brijesh.singh@amd.com
Subject: [PATCH v9 08/18] KVM: X86: Introduce KVM_HC_PAGE_ENC_STATUS hypercall
Date: Tue, 8 Dec 2020 22:06:14 +0000 [thread overview]
Message-ID: <5506c55bbf19794c7815c9c4d2a9867158b275eb.1607460588.git.ashish.kalra@amd.com> (raw)
In-Reply-To: <cover.1607460588.git.ashish.kalra@amd.com>
From: Brijesh Singh <brijesh.singh@amd.com>
This hypercall is used by the SEV guest to notify a change in the page
encryption status to the hypervisor. The hypercall should be invoked
only when the encryption attribute is changed from encrypted -> decrypted
and vice versa. By default all guest pages are considered encrypted.
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: x86@kernel.org
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Venu Busireddy <venu.busireddy@oracle.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
---
Documentation/virt/kvm/hypercalls.rst | 15 +++++
arch/x86/include/asm/kvm_host.h | 2 +
arch/x86/kvm/svm/sev.c | 90 +++++++++++++++++++++++++++
arch/x86/kvm/svm/svm.c | 2 +
arch/x86/kvm/svm/svm.h | 4 ++
arch/x86/kvm/vmx/vmx.c | 1 +
arch/x86/kvm/x86.c | 6 ++
include/uapi/linux/kvm_para.h | 1 +
8 files changed, 121 insertions(+)
diff --git a/Documentation/virt/kvm/hypercalls.rst b/Documentation/virt/kvm/hypercalls.rst
index ed4fddd364ea..7aff0cebab7c 100644
--- a/Documentation/virt/kvm/hypercalls.rst
+++ b/Documentation/virt/kvm/hypercalls.rst
@@ -169,3 +169,18 @@ a0: destination APIC ID
:Usage example: When sending a call-function IPI-many to vCPUs, yield if
any of the IPI target vCPUs was preempted.
+
+
+8. KVM_HC_PAGE_ENC_STATUS
+-------------------------
+:Architecture: x86
+:Status: active
+:Purpose: Notify the encryption status changes in guest page table (SEV guest)
+
+a0: the guest physical address of the start page
+a1: the number of pages
+a2: encryption attribute
+
+ Where:
+ * 1: Encryption attribute is set
+ * 0: Encryption attribute is cleared
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index f002cdb13a0b..d035dc983a7a 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1282,6 +1282,8 @@ struct kvm_x86_ops {
void (*migrate_timers)(struct kvm_vcpu *vcpu);
void (*msr_filter_changed)(struct kvm_vcpu *vcpu);
+ int (*page_enc_status_hc)(struct kvm *kvm, unsigned long gpa,
+ unsigned long sz, unsigned long mode);
};
struct kvm_x86_nested_ops {
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index edd98a8de2f8..134d7f330fed 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -1361,6 +1361,93 @@ static int sev_receive_finish(struct kvm *kvm, struct kvm_sev_cmd *argp)
return ret;
}
+static int sev_resize_page_enc_bitmap(struct kvm *kvm, unsigned long new_size)
+{
+ struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
+ unsigned long *map;
+ unsigned long sz;
+
+ if (sev->page_enc_bmap_size >= new_size)
+ return 0;
+
+ sz = ALIGN(new_size, BITS_PER_LONG) / 8;
+
+ map = vmalloc(sz);
+ if (!map) {
+ pr_err_once("Failed to allocate encrypted bitmap size %lx\n",
+ sz);
+ return -ENOMEM;
+ }
+
+ /* mark the page encrypted (by default) */
+ memset(map, 0xff, sz);
+
+ bitmap_copy(map, sev->page_enc_bmap, sev->page_enc_bmap_size);
+ kvfree(sev->page_enc_bmap);
+
+ sev->page_enc_bmap = map;
+ sev->page_enc_bmap_size = new_size;
+
+ return 0;
+}
+
+int svm_page_enc_status_hc(struct kvm *kvm, unsigned long gpa,
+ unsigned long npages, unsigned long enc)
+{
+ struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
+ kvm_pfn_t pfn_start, pfn_end;
+ gfn_t gfn_start, gfn_end;
+
+ if (!sev_guest(kvm))
+ return -EINVAL;
+
+ if (!npages)
+ return 0;
+
+ gfn_start = gpa_to_gfn(gpa);
+ gfn_end = gfn_start + npages;
+
+ /* out of bound access error check */
+ if (gfn_end <= gfn_start)
+ return -EINVAL;
+
+ /* lets make sure that gpa exist in our memslot */
+ pfn_start = gfn_to_pfn(kvm, gfn_start);
+ pfn_end = gfn_to_pfn(kvm, gfn_end);
+
+ if (is_error_noslot_pfn(pfn_start) && !is_noslot_pfn(pfn_start)) {
+ /*
+ * Allow guest MMIO range(s) to be added
+ * to the page encryption bitmap.
+ */
+ return -EINVAL;
+ }
+
+ if (is_error_noslot_pfn(pfn_end) && !is_noslot_pfn(pfn_end)) {
+ /*
+ * Allow guest MMIO range(s) to be added
+ * to the page encryption bitmap.
+ */
+ return -EINVAL;
+ }
+
+ mutex_lock(&kvm->lock);
+
+ if (sev->page_enc_bmap_size < gfn_end)
+ goto unlock;
+
+ if (enc)
+ __bitmap_set(sev->page_enc_bmap, gfn_start,
+ gfn_end - gfn_start);
+ else
+ __bitmap_clear(sev->page_enc_bmap, gfn_start,
+ gfn_end - gfn_start);
+
+unlock:
+ mutex_unlock(&kvm->lock);
+ return 0;
+}
+
int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
{
struct kvm_sev_cmd sev_cmd;
@@ -1575,6 +1662,9 @@ void sev_vm_destroy(struct kvm *kvm)
sev_unbind_asid(kvm, sev->handle);
sev_asid_free(sev->asid);
+
+ kvfree(sev->page_enc_bmap);
+ sev->page_enc_bmap = NULL;
}
int __init sev_hardware_setup(void)
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 6dc337b9c231..7122ea5f7c47 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4312,6 +4312,8 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
.apic_init_signal_blocked = svm_apic_init_signal_blocked,
.msr_filter_changed = svm_msr_filter_changed,
+
+ .page_enc_status_hc = svm_page_enc_status_hc,
};
static struct kvm_x86_init_ops svm_init_ops __initdata = {
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index fdff76eb6ceb..0103a23ca174 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -66,6 +66,8 @@ struct kvm_sev_info {
int fd; /* SEV device fd */
unsigned long pages_locked; /* Number of pages locked */
struct list_head regions_list; /* List of registered regions */
+ unsigned long *page_enc_bmap;
+ unsigned long page_enc_bmap_size;
};
struct kvm_svm {
@@ -409,6 +411,8 @@ int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
bool has_error_code, u32 error_code);
int nested_svm_exit_special(struct vcpu_svm *svm);
void sync_nested_vmcb_control(struct vcpu_svm *svm);
+int svm_page_enc_status_hc(struct kvm *kvm, unsigned long gpa,
+ unsigned long npages, unsigned long enc);
extern struct kvm_x86_nested_ops svm_nested_ops;
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index c3441e7e5a87..f0a00e69f892 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7719,6 +7719,7 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
.can_emulate_instruction = vmx_can_emulate_instruction,
.apic_init_signal_blocked = vmx_apic_init_signal_blocked,
.migrate_timers = vmx_migrate_timers,
+ .page_enc_status_hc = NULL,
.msr_filter_changed = vmx_msr_filter_changed,
.cpu_dirty_log_size = vmx_cpu_dirty_log_size,
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a3fdc16cfd6f..3afc78f18f69 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8125,6 +8125,12 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
kvm_sched_yield(vcpu->kvm, a0);
ret = 0;
break;
+ case KVM_HC_PAGE_ENC_STATUS:
+ ret = -KVM_ENOSYS;
+ if (kvm_x86_ops.page_enc_status_hc)
+ ret = kvm_x86_ops.page_enc_status_hc(vcpu->kvm,
+ a0, a1, a2);
+ break;
default:
ret = -KVM_ENOSYS;
break;
diff --git a/include/uapi/linux/kvm_para.h b/include/uapi/linux/kvm_para.h
index 8b86609849b9..847b83b75dc8 100644
--- a/include/uapi/linux/kvm_para.h
+++ b/include/uapi/linux/kvm_para.h
@@ -29,6 +29,7 @@
#define KVM_HC_CLOCK_PAIRING 9
#define KVM_HC_SEND_IPI 10
#define KVM_HC_SCHED_YIELD 11
+#define KVM_HC_PAGE_ENC_STATUS 12
/*
* hypercalls use architecture specific
--
2.17.1
next prev parent reply other threads:[~2020-12-08 22:07 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-08 22:02 [PATCH v9 00/18] Add AMD SEV guest live migration support Ashish Kalra
2020-12-08 22:03 ` [PATCH v9 01/18] KVM: SVM: Add KVM_SEV SEND_START command Ashish Kalra
2020-12-08 22:04 ` [PATCH v9 02/18] KVM: SVM: Add KVM_SEND_UPDATE_DATA command Ashish Kalra
2020-12-08 22:04 ` [PATCH v9 03/18] KVM: SVM: Add KVM_SEV_SEND_FINISH command Ashish Kalra
2020-12-08 22:05 ` [PATCH v9 04/18] KVM: SVM: Add support for KVM_SEV_RECEIVE_START command Ashish Kalra
2020-12-08 22:05 ` [PATCH v9 05/18] KVM: SVM: Add KVM_SEV_RECEIVE_UPDATE_DATA command Ashish Kalra
2020-12-08 22:05 ` [PATCH v9 06/18] KVM: SVM: Add KVM_SEV_RECEIVE_FINISH command Ashish Kalra
2020-12-08 22:05 ` [PATCH v9 07/18] KVM: x86: Add AMD SEV specific Hypercall3 Ashish Kalra
2020-12-08 22:06 ` Ashish Kalra [this message]
2020-12-08 22:06 ` [PATCH v9 09/18] KVM: x86: Introduce KVM_GET_PAGE_ENC_BITMAP ioctl Ashish Kalra
2020-12-08 22:06 ` [PATCH v9 10/18] mm: x86: Invoke hypercall when page encryption status is changed Ashish Kalra
2020-12-08 22:07 ` [PATCH v9 11/18] KVM: x86: Introduce KVM_SET_PAGE_ENC_BITMAP ioctl Ashish Kalra
2020-12-08 22:07 ` [PATCH v9 12/18] KVM: SVM: Add support for static allocation of unified Page Encryption Bitmap Ashish Kalra
2020-12-08 22:07 ` [PATCH v9 13/18] KVM: x86: Introduce new KVM_FEATURE_SEV_LIVE_MIGRATION feature & Custom MSR Ashish Kalra
2020-12-08 22:08 ` [PATCH v9 14/18] EFI: Introduce the new AMD Memory Encryption GUID Ashish Kalra
2020-12-08 22:08 ` [PATCH v9 15/18] KVM: x86: Add guest support for detecting and enabling SEV Live Migration feature Ashish Kalra
2020-12-08 22:08 ` [PATCH v9 16/18] KVM: x86: Mark _bss_decrypted section variables as decrypted in page encryption bitmap Ashish Kalra
2020-12-08 22:09 ` [PATCH v9 17/18] KVM: x86: Add kexec support for SEV Live Migration Ashish Kalra
2020-12-08 22:09 ` [PATCH v9 18/18] KVM: SVM: Bypass DBG_DECRYPT API calls for unecrypted guest memory Ashish Kalra
2021-01-15 0:31 ` [PATCH v9 00/18] Add AMD SEV guest live migration support Steve Rutherford
2021-01-15 1:16 ` Kalra, Ashish
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