linux-kernel - [RFC PATCH 08/31] KVM: selftests: Make GHCB entry page size aligned

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Message-ID: <20250228093024.114983-9-Neeraj.Upadhyay@amd.com>
Date: Fri, 28 Feb 2025 15:00:01 +0530
From: Neeraj Upadhyay <Neeraj.Upadhyay@....com>
To: <kvm@...r.kernel.org>, <seanjc@...gle.com>, <pbonzini@...hat.com>
CC: <linux-kernel@...r.kernel.org>, <Thomas.Lendacky@....com>,
	<nikunj@....com>, <Santosh.Shukla@....com>, <Vasant.Hegde@....com>,
	<Suravee.Suthikulpanit@....com>, <bp@...en8.de>, <David.Kaplan@....com>,
	<huibo.wang@....com>, <naveen.rao@....com>, <pgonda@...gle.com>,
	<linux-kselftest@...r.kernel.org>, <shuah@...nel.org>
Subject: [RFC PATCH 08/31] KVM: selftests: Make GHCB entry page size aligned

Make GHCB entry page size aligned. Without this change
GHCB GPA registration gets incorrectly interpreted in
host as a GHCB MSR protocol request.

Signed-off-by: Neeraj Upadhyay <Neeraj.Upadhyay@....com>
---
 tools/testing/selftests/kvm/lib/x86/sev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/lib/x86/sev.c b/tools/testing/selftests/kvm/lib/x86/sev.c
index 228c446072a8..38813f60c252 100644
--- a/tools/testing/selftests/kvm/lib/x86/sev.c
+++ b/tools/testing/selftests/kvm/lib/x86/sev.c
@@ -22,7 +22,7 @@ struct ghcb_entry {
 
 	/* Host virtual address of this struct. */
 	struct ghcb_entry *hva;
-};
+} __attribute__((__aligned__(PAGE_SIZE)));
 
 struct ghcb_header {
 	struct ghcb_entry ghcbs[KVM_MAX_VCPUS];
-- 
2.34.1