From: Paolo Bonzini <pbonzini@redhat.com>
Date: Mon, 18 Oct 2021 10:49:18 +0000 (-0400)
Subject: KVM: SEV-ES: reduce ghcb_sa_len to 32 bits
X-Git-Tag: accepted/tizen/unified/20230118.172025~6142^2~11
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9f1ee7b169afbd10c3ad254220d1b37beb5798aa;p=platform%2Fkernel%2Flinux-rpi.git

KVM: SEV-ES: reduce ghcb_sa_len to 32 bits

The size of the GHCB scratch area is limited to 16 KiB (GHCB_SCRATCH_AREA_LIMIT),
so there is no need for it to be a u64.  This fixes a build error on 32-bit
systems:

i686-linux-gnu-ld: arch/x86/kvm/svm/sev.o: in function `sev_es_string_io:
sev.c:(.text+0x110f): undefined reference to `__udivdi3'

Cc: stable@vger.kernel.org
Fixes: 019057bd73d1 ("KVM: SEV-ES: fix length of string I/O")
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 128a54b..5d30db5 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -191,7 +191,7 @@ struct vcpu_svm {
 
 	/* SEV-ES scratch area support */
 	void *ghcb_sa;
-	u64 ghcb_sa_len;
+	u32 ghcb_sa_len;
 	bool ghcb_sa_sync;
 	bool ghcb_sa_free;