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 v5 07/16] KVM: x86/xen: register shared_info page
Date: Mon, 11 Jan 2021 19:57:16 +0000 [thread overview]
Message-ID: <20210111195725.4601-8-dwmw2@infradead.org> (raw)
In-Reply-To: <20210111195725.4601-1-dwmw2@infradead.org>
From: Joao Martins <joao.m.martins@oracle.com>
We add a new ioctl, XEN_HVM_SHARED_INFO, to allow hypervisor
to know where the guest's shared info page is.
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
arch/x86/include/asm/kvm_host.h | 2 ++
arch/x86/kvm/xen.c | 27 +++++++++++++++++++++++++++
include/uapi/linux/kvm.h | 4 ++++
3 files changed, 33 insertions(+)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 4ca6e060b578..07ae5887afa1 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -897,6 +897,8 @@ struct msr_bitmap_range {
/* Xen emulation context */
struct kvm_xen {
bool long_mode;
+ bool shinfo_set;
+ struct gfn_to_hva_cache shinfo_cache;
};
enum kvm_irqchip_mode {
diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c
index 52cb9e465542..9dd9c42842b8 100644
--- a/arch/x86/kvm/xen.c
+++ b/arch/x86/kvm/xen.c
@@ -13,9 +13,23 @@
#include <linux/kvm_host.h>
#include <trace/events/kvm.h>
+#include <xen/interface/xen.h>
#include "trace.h"
+static int kvm_xen_shared_info_init(struct kvm *kvm, gfn_t gfn)
+{
+ int ret;
+
+ ret = kvm_gfn_to_hva_cache_init(kvm, &kvm->arch.xen.shinfo_cache,
+ gfn_to_gpa(gfn), PAGE_SIZE);
+ if (ret)
+ return ret;
+
+ kvm->arch.xen.shinfo_set = true;
+ return 0;
+}
+
int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
{
int r = -ENOENT;
@@ -28,6 +42,11 @@ int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
kvm->arch.xen.long_mode = !!data->u.long_mode;
r = 0;
break;
+
+ case KVM_XEN_ATTR_TYPE_SHARED_INFO:
+ r = kvm_xen_shared_info_init(kvm, data->u.shared_info.gfn);
+ break;
+
default:
break;
}
@@ -44,6 +63,14 @@ int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
data->u.long_mode = kvm->arch.xen.long_mode;
r = 0;
break;
+
+ case KVM_XEN_ATTR_TYPE_SHARED_INFO:
+ if (kvm->arch.xen.shinfo_set) {
+ data->u.shared_info.gfn = gpa_to_gfn(kvm->arch.xen.shinfo_cache.gpa);
+ r = 0;
+ }
+ break;
+
default:
break;
}
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 3293866d5ee1..0c04bb6eda09 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1593,11 +1593,15 @@ struct kvm_xen_hvm_attr {
__u16 pad[3];
union {
__u8 long_mode;
+ struct {
+ __u64 gfn;
+ } shared_info;
__u64 pad[4];
} u;
};
#define KVM_XEN_ATTR_TYPE_LONG_MODE 0x0
+#define KVM_XEN_ATTR_TYPE_SHARED_INFO 0x1
/* Secure Encrypted Virtualization command */
enum sev_cmd_id {
--
2.29.2
next prev parent reply other threads:[~2021-01-11 19:59 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-11 19:57 [PATCH v5 00/16] KVM: Add minimal support for Xen HVM guests David Woodhouse
2021-01-11 19:57 ` [PATCH v5 01/16] KVM: x86/xen: fix Xen hypercall page msr handling David Woodhouse
2021-01-11 19:57 ` [PATCH v5 02/16] KVM: x86/xen: intercept xen hypercalls if enabled David Woodhouse
2021-01-11 23:42 ` kernel test robot
2021-01-28 12:21 ` Paolo Bonzini
2021-01-11 19:57 ` [PATCH v5 03/16] KVM: x86/xen: Fix coexistence of Xen and Hyper-V hypercalls David Woodhouse
2021-01-11 19:57 ` [PATCH v5 04/16] KVM: x86/xen: add KVM_XEN_HVM_SET_ATTR/KVM_XEN_HVM_GET_ATTR David Woodhouse
2021-01-11 19:57 ` [PATCH v5 05/16] KVM: x86/xen: latch long_mode when hypercall page is set up David Woodhouse
2021-01-11 19:57 ` [PATCH v5 06/16] KVM: x86/xen: add definitions of compat_shared_info, compat_vcpu_info David Woodhouse
2021-01-11 19:57 ` David Woodhouse [this message]
2021-01-11 19:57 ` [PATCH v5 08/16] xen: add wc_sec_hi to struct shared_info David Woodhouse
2021-01-11 19:57 ` [PATCH v5 09/16] KVM: x86/xen: update wallclock region David Woodhouse
2021-01-11 19:57 ` [PATCH v5 10/16] KVM: x86/xen: register vcpu info David Woodhouse
2021-01-11 19:57 ` [PATCH v5 11/16] KVM: x86/xen: setup pvclock updates David Woodhouse
2021-01-11 19:57 ` [PATCH v5 12/16] KVM: x86/xen: register vcpu time info region David Woodhouse
2021-01-11 19:57 ` [PATCH v5 13/16] KVM: x86/xen: register runstate info David Woodhouse
2021-01-28 12:15 ` Paolo Bonzini
2021-01-11 19:57 ` [PATCH v5 14/16] KVM: x86: declare Xen HVM shared info capability and add test case David Woodhouse
2021-01-11 19:57 ` [PATCH v5 15/16] KVM: Add documentation for Xen hypercall and shared_info updates David Woodhouse
2021-01-28 12:18 ` Paolo Bonzini
2021-01-28 16:49 ` David Woodhouse
2021-01-28 17:06 ` Paolo Bonzini
[not found] ` <f9b2b4e613ea4e6dd1f253f5092254d121c93c07.camel@infradead.org>
2021-01-29 7:59 ` Paolo Bonzini
2021-01-11 19:57 ` [PATCH v5 16/16] KVM: x86/xen: Add event channel interrupt vector upcall David Woodhouse
2021-01-28 12:43 ` Paolo Bonzini
2021-01-28 15:35 ` David Woodhouse
2021-01-28 17:01 ` Paolo Bonzini
2021-01-29 17:33 ` David Woodhouse
2021-01-29 19:19 ` Paolo Bonzini
2021-01-30 13:01 ` David Woodhouse
2021-01-21 11:56 ` [PATCH v5 17/16] KVM: x86/xen: Fix initialisation of gfn caches for Xen shared pages David Woodhouse
2021-01-28 12:45 ` [PATCH v5 00/16] KVM: Add minimal support for Xen HVM guests Paolo Bonzini
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