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OpenCloudOS-Kernel
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KVM: x86/xen: latch long_mode when hypercall page is set up 

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
This commit is contained in:
David Woodhouse 2020-12-03 16:20:32 +00:00
parent a76b9641ad
commit a3833b81b0
3 changed files with 24 additions and 1 deletions
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6
arch/x86/include/asm/kvm_host.h
View File

@ -905,6 +905,11 @@ 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 */
@ -984,6 +989,7 @@ 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;

16
arch/x86/kvm/xen.c
View File

@ -25,6 +25,13 @@ int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
mutex_unlock(&kvm->lock);
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;
}
@ -40,6 +47,10 @@ int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
mutex_lock(&kvm->lock);
switch (data->type) {
case KVM_XEN_ATTR_TYPE_LONG_MODE:
data->u.long_mode = kvm->arch.xen.long_mode;
r = 0;
break;
default:
break;
}
@ -53,6 +64,10 @@ int kvm_xen_write_hypercall_page(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
@ -87,7 +102,6 @@ int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data)
return 1;
}
} else {
int lm = is_long_mode(vcpu);
u64 blob_addr = lm ? kvm->arch.xen_hvm_config.blob_addr_64
: kvm->arch.xen_hvm_config.blob_addr_32;
u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64

3
include/uapi/linux/kvm.h
View File

@ -1594,10 +1594,13 @@ struct kvm_xen_hvm_attr {
__u16 type;
__u16 pad[3];
union {
__u8 long_mode;
__u64 pad[8];
} u;
};
#define KVM_XEN_ATTR_TYPE_LONG_MODE 0x0
/* Secure Encrypted Virtualization command */
enum sev_cmd_id {
/* Guest initialization commands */