linux-kernel - [PATCH RFC v8 40/56] KVM: SVM: Add KVM_EXIT

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Date:   Mon, 20 Feb 2023 12:38:31 -0600
From:   Michael Roth <michael.roth@....com>
To:     <kvm@...r.kernel.org>
CC:     <linux-coco@...ts.linux.dev>, <linux-mm@...ck.org>,
        <linux-crypto@...r.kernel.org>, <x86@...nel.org>,
        <linux-kernel@...r.kernel.org>, <tglx@...utronix.de>,
        <mingo@...hat.com>, <jroedel@...e.de>, <thomas.lendacky@....com>,
        <hpa@...or.com>, <ardb@...nel.org>, <pbonzini@...hat.com>,
        <seanjc@...gle.com>, <vkuznets@...hat.com>, <jmattson@...gle.com>,
        <luto@...nel.org>, <dave.hansen@...ux.intel.com>, <slp@...hat.com>,
        <pgonda@...gle.com>, <peterz@...radead.org>,
        <srinivas.pandruvada@...ux.intel.com>, <rientjes@...gle.com>,
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        <alpergun@...gle.com>, <dgilbert@...hat.com>, <jarkko@...nel.org>,
        <ashish.kalra@....com>, <nikunj.dadhania@....com>
Subject: [PATCH RFC v8 40/56] KVM: SVM: Add KVM_EXIT_VMGEXIT

For private memslots, GHCB page state change requests will be forwarded
to userspace for processing. Define a new KVM_EXIT_VMGEXIT for exits of
this type.

Signed-off-by: Michael Roth <michael.roth@....com>
---
 include/uapi/linux/kvm.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 2bab08a5b5d7..6e684bf5f723 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -279,6 +279,7 @@ struct kvm_xen_exit {
 #define KVM_EXIT_RISCV_CSR        36
 #define KVM_EXIT_NOTIFY           37
 #define KVM_EXIT_MEMORY_FAULT     38
+#define KVM_EXIT_VMGEXIT          50
 
 /* For KVM_EXIT_INTERNAL_ERROR */
 /* Emulate instruction failed. */
@@ -527,6 +528,11 @@ struct kvm_run {
 			__u64 gpa;
 			__u64 size;
 		} memory;
+		/* KVM_EXIT_VMGEXIT */
+		struct {
+			__u64 ghcb_msr; /* GHCB MSR contents */
+			__u8 error; /* user -> kernel */
+		} vmgexit;
 		/* Fix the size of the union. */
 		char padding[256];
 	};
-- 
2.25.1