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From: David Woodhouse <dwmw2@infradead.org>
To: kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Ankur Arora <ankur.a.arora@oracle.com>,
	Joao Martins <joao.m.martins@oracle.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Sean Christopherson <seanjc@google.com>,
	graf@amazon.com, iaslan@amazon.de, pdurrant@amazon.com,
	aagch@amazon.com, fandree@amazon.com, hch@infradead.org
Subject: [PATCH v4 05/16] KVM: x86/xen: latch long_mode when hypercall page is set up
Date: Wed,  6 Jan 2021 00:23:03 +0000
Message-ID: <20210106002314.328380-6-dwmw2@infradead.org> (raw)
In-Reply-To: <20210106002314.328380-1-dwmw2@infradead.org>

From: David Woodhouse <dwmw@amazon.co.uk>

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
 arch/x86/include/asm/kvm_host.h |  6 ++++++
 arch/x86/kvm/xen.c              | 16 +++++++++++++++-
 include/uapi/linux/kvm.h        |  3 +++
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 2ceda5aecac5..4fcb27a9fe36 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -894,6 +894,11 @@ struct msr_bitmap_range {
 	unsigned long *bitmap;
 };
 
+/* Xen emulation context */
+struct kvm_xen {
+	bool long_mode;
+};
+
 enum kvm_irqchip_mode {
 	KVM_IRQCHIP_NONE,
 	KVM_IRQCHIP_KERNEL,       /* created with KVM_CREATE_IRQCHIP */
@@ -973,6 +978,7 @@ struct kvm_arch {
 	struct hlist_head mask_notifier_list;
 
 	struct kvm_hv hyperv;
+	struct kvm_xen xen;
 
 	#ifdef CONFIG_KVM_MMU_AUDIT
 	int audit_point;
diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c
index c0b2c67e0235..52cb9e465542 100644
--- a/arch/x86/kvm/xen.c
+++ b/arch/x86/kvm/xen.c
@@ -21,6 +21,13 @@ int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
 	int r = -ENOENT;
 
 	switch (data->type) {
+	case KVM_XEN_ATTR_TYPE_LONG_MODE:
+		if (!IS_ENABLED(CONFIG_64BIT) && data->u.long_mode)
+			return -EINVAL;
+
+		kvm->arch.xen.long_mode = !!data->u.long_mode;
+		r = 0;
+		break;
 	default:
 		break;
 	}
@@ -33,6 +40,10 @@ int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
 	int r = -ENOENT;
 
 	switch (data->type) {
+	case KVM_XEN_ATTR_TYPE_LONG_MODE:
+		data->u.long_mode = kvm->arch.xen.long_mode;
+		r = 0;
+		break;
 	default:
 		break;
 	}
@@ -45,6 +56,10 @@ int kvm_xen_hvm_config(struct kvm_vcpu *vcpu, u64 data)
 	struct kvm *kvm = vcpu->kvm;
 	u32 page_num = data & ~PAGE_MASK;
 	u64 page_addr = data & PAGE_MASK;
+	bool lm = is_long_mode(vcpu);
+
+	/* Latch long_mode for shared_info pages etc. */
+	vcpu->kvm->arch.xen.long_mode = lm;
 
 	/*
 	 * If Xen hypercall intercept is enabled, fill the hypercall
@@ -79,7 +94,6 @@ int kvm_xen_hvm_config(struct kvm_vcpu *vcpu, u64 data)
 				return 1;
 		}
 	} else {
-		int lm = is_long_mode(vcpu);
 		u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64
 				   : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32;
 		u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 7b5fed0cb2ad..b7cf887c8e4d 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1590,10 +1590,13 @@ struct kvm_xen_hvm_attr {
 	__u16 type;
 
 	union {
+		__u8 long_mode;
 		__u64 pad[4];
 	} u;
 };
 
+#define KVM_XEN_ATTR_TYPE_LONG_MODE		0x0
+
 /* Secure Encrypted Virtualization command */
 enum sev_cmd_id {
 	/* Guest initialization commands */
-- 
2.29.2


  parent reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-06  0:22 [PATCH v4 00/16] KVM: Add minimal support for Xen HVM guests David Woodhouse
2021-01-06  0:22 ` [PATCH v4 01/16] KVM: x86/xen: fix Xen hypercall page msr handling David Woodhouse
2021-01-06  0:23 ` [PATCH v4 02/16] KVM: x86/xen: intercept xen hypercalls if enabled David Woodhouse
2021-01-06  0:23 ` [PATCH v4 03/16] KVM: x86/xen: Fix coexistence of Xen and Hyper-V hypercalls David Woodhouse
2021-01-06  0:23 ` [PATCH v4 04/16] KVM: x86/xen: add KVM_XEN_HVM_SET_ATTR/KVM_XEN_HVM_GET_ATTR David Woodhouse
2021-01-06  0:23 ` David Woodhouse [this message]
2021-01-06  0:23 ` [PATCH v4 06/16] KVM: x86/xen: add definitions of compat_shared_info, compat_vcpu_info David Woodhouse
2021-01-06  0:23 ` [PATCH v4 07/16] KVM: x86/xen: register shared_info page David Woodhouse
2021-01-06  0:23 ` [PATCH v4 08/16] xen: add wc_sec_hi to struct shared_info David Woodhouse
2021-01-06  0:23 ` [PATCH v4 09/16] KVM: x86/xen: update wallclock region David Woodhouse
2021-01-06  0:23 ` [PATCH v4 10/16] KVM: x86/xen: register vcpu info David Woodhouse
2021-01-06  0:23 ` [PATCH v4 11/16] KVM: x86/xen: setup pvclock updates David Woodhouse
2021-01-06  0:23 ` [PATCH v4 12/16] KVM: x86/xen: register vcpu time info region David Woodhouse
2021-01-06  0:23 ` [PATCH v4 13/16] KVM: x86/xen: register runstate info David Woodhouse
2021-01-06  0:23 ` [PATCH v4 14/16] KVM: x86: declare Xen HVM shared info capability and add test case David Woodhouse
2021-01-06  0:23 ` [PATCH v4 15/16] KVM: Add documentation for Xen hypercall and shared_info updates David Woodhouse
2021-01-06  0:23 ` [PATCH v4 16/16] KVM: x86/xen: Add event channel interrupt vector upcall David Woodhouse

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