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From: Bandan Das <bsd@redhat.com>
To: kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Laszlo Ersek <lersek@redhat.com>,
	linux-kernel@vger.kernel.org, qemu-devel@nongnu.org
Subject: [PATCH] KVM: x86: Add host physical address width capability
Date: Wed, 08 Jul 2015 18:36:43 -0400	[thread overview]
Message-ID: <jpg615ul1j8.fsf@linux.bootlegged.copy> (raw)


Let userspace inquire the maximum physical address width
of the host processors; this can be used to identify maximum
memory that can be assigned to the guest.

Reported-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Bandan Das <bsd@redhat.com>
---
 arch/x86/kvm/x86.c       | 3 +++
 include/uapi/linux/kvm.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bbaf44e..97d6746 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2683,6 +2683,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_NR_MEMSLOTS:
 		r = KVM_USER_MEM_SLOTS;
 		break;
+	case KVM_CAP_PHY_ADDR_WIDTH:
+		r = boot_cpu_data.x86_phys_bits;
+		break;
 	case KVM_CAP_PV_MMU:	/* obsolete */
 		r = 0;
 		break;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 716ad4a..e7949a1 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -817,6 +817,7 @@ struct kvm_ppc_smmu_info {
 #define KVM_CAP_DISABLE_QUIRKS 116
 #define KVM_CAP_X86_SMM 117
 #define KVM_CAP_MULTI_ADDRESS_SPACE 118
+#define KVM_CAP_PHY_ADDR_WIDTH 119
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
-- 
2.4.3


WARNING: multiple messages have this Message-ID (diff)
From: Bandan Das <bsd@redhat.com>
To: kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Laszlo Ersek <lersek@redhat.com>,
	linux-kernel@vger.kernel.org, qemu-devel@nongnu.org
Subject: [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability
Date: Wed, 08 Jul 2015 18:36:43 -0400	[thread overview]
Message-ID: <jpg615ul1j8.fsf@linux.bootlegged.copy> (raw)


Let userspace inquire the maximum physical address width
of the host processors; this can be used to identify maximum
memory that can be assigned to the guest.

Reported-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Bandan Das <bsd@redhat.com>
---
 arch/x86/kvm/x86.c       | 3 +++
 include/uapi/linux/kvm.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bbaf44e..97d6746 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2683,6 +2683,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_NR_MEMSLOTS:
 		r = KVM_USER_MEM_SLOTS;
 		break;
+	case KVM_CAP_PHY_ADDR_WIDTH:
+		r = boot_cpu_data.x86_phys_bits;
+		break;
 	case KVM_CAP_PV_MMU:	/* obsolete */
 		r = 0;
 		break;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 716ad4a..e7949a1 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -817,6 +817,7 @@ struct kvm_ppc_smmu_info {
 #define KVM_CAP_DISABLE_QUIRKS 116
 #define KVM_CAP_X86_SMM 117
 #define KVM_CAP_MULTI_ADDRESS_SPACE 118
+#define KVM_CAP_PHY_ADDR_WIDTH 119
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
-- 
2.4.3

             reply	other threads:[~2015-07-08 22:36 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-07-08 22:36 Bandan Das [this message]
2015-07-08 22:36 ` [Qemu-devel] [PATCH] KVM: x86: Add host physical address width capability Bandan Das
2015-07-09  6:09 ` Paolo Bonzini
2015-07-09  6:09   ` [Qemu-devel] " Paolo Bonzini
2015-07-09  6:43   ` Laszlo Ersek
2015-07-09  6:43     ` [Qemu-devel] " Laszlo Ersek
2015-07-09 12:41     ` Paolo Bonzini
2015-07-09 12:41       ` [Qemu-devel] " Paolo Bonzini
2015-07-09 18:32       ` Bandan Das
2015-07-09 18:32         ` [Qemu-devel] " Bandan Das
2015-07-09 18:57         ` Laszlo Ersek
2015-07-09 18:57           ` [Qemu-devel] " Laszlo Ersek
2015-07-09 18:57           ` Laszlo Ersek
2015-07-09 20:02           ` Bandan Das
2015-07-09 20:02             ` [Qemu-devel] " Bandan Das
2015-07-09 20:02             ` Bandan Das
2015-07-09 20:15             ` Laszlo Ersek
2015-07-09 20:15               ` [Qemu-devel] " Laszlo Ersek
2015-07-10  3:37             ` Bandan Das
2015-07-10  3:37               ` [Qemu-devel] " Bandan Das
2015-07-10  3:37               ` Bandan Das
2015-07-10 14:13           ` Paolo Bonzini
2015-07-10 14:13             ` [Qemu-devel] " Paolo Bonzini
2015-07-10 14:57             ` Laszlo Ersek
2015-07-10 14:57               ` [Qemu-devel] " Laszlo Ersek
2015-07-10 14:59               ` Paolo Bonzini
2015-07-10 14:59                 ` [Qemu-devel] " Paolo Bonzini
2015-07-10 15:06                 ` Laszlo Ersek
2015-07-10 15:06                   ` [Qemu-devel] " Laszlo Ersek
2015-07-10 15:06                   ` Laszlo Ersek
2015-07-10 15:45                   ` Bandan Das
2015-07-10 15:45                     ` [Qemu-devel] " Bandan Das

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