diff mbox series

[RFC,01/26] linux-headers: Add definitions of KVM page encryption bitmap ioctls

Message ID 20210302204822.81901-2-dovmurik@linux.vnet.ibm.com
State New
Headers show
Series Confidential guest live migration | expand

Commit Message

Dov Murik March 2, 2021, 8:47 p.m. UTC 
Add support for two ioctls KVM_GET_PAGE_ENC_BITMAP and
KVM_SET_PAGE_ENC_BITMAP used to record the encryption state of each
guest page.

This patch will be replaced by a new implementation based on shared
regions list, or by user-space handling of the regions list.  However,
these changes do not affect the use of the page encryption indication in
confidential guest migration flow.

Signed-off-by: Dov Murik <dovmurik@linux.vnet.ibm.com>
---
 linux-headers/linux/kvm.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)
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Patch

diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h
index 020b62a619..836c3776c0 100644
--- a/linux-headers/linux/kvm.h
+++ b/linux-headers/linux/kvm.h
@@ -532,6 +532,16 @@  struct kvm_dirty_log {
 	};
 };
 
+/* for KVM_GET_PAGE_ENC_BITMAP */
+struct kvm_page_enc_bitmap {
+	__u64 start_gfn;
+	__u64 num_pages;
+	union {
+		void *enc_bitmap; /* one bit per page */
+		__u64 padding2;
+	};
+};
+
 /* for KVM_CLEAR_DIRTY_LOG */
 struct kvm_clear_dirty_log {
 	__u32 slot;
@@ -1557,6 +1567,9 @@  struct kvm_pv_cmd {
 /* Available with KVM_CAP_S390_PROTECTED */
 #define KVM_S390_PV_COMMAND		_IOWR(KVMIO, 0xc5, struct kvm_pv_cmd)
 
+#define KVM_GET_PAGE_ENC_BITMAP	_IOW(KVMIO, 0xc6, struct kvm_page_enc_bitmap)
+#define KVM_SET_PAGE_ENC_BITMAP	_IOW(KVMIO, 0xc7, struct kvm_page_enc_bitmap)
+
 /* Available with KVM_CAP_X86_MSR_FILTER */
 #define KVM_X86_SET_MSR_FILTER	_IOW(KVMIO,  0xc6, struct kvm_msr_filter)