36 lines
1.2 KiB
Diff
36 lines
1.2 KiB
Diff
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From 2830db7bec600915e88bb22847a66d99b047a308 Mon Sep 17 00:00:00 2001
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From: liupingwei <liupingwei0317@outlook.com>
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Date: Mon, 17 Jun 2024 19:56:48 +0800
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Subject: [PATCH] hw/arm/virt:Disable DTB randomness for confidential VMs
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The dtb-randomness feature,which adds random seeds to the DTB,isn't
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really compatible with confidential VMs since it randomizes the
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TMM.Enabling it is not an error,but it prevents attestation.It also
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isn't useful to TMM,which dosn't trust host input.
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Fixes:12d0d099aecb("Add support for the virtcca cvm feature")
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Signed-off-by: liupingwei <liupingwei0317@outlook.com>
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---
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hw/arm/virt.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/hw/arm/virt.c b/hw/arm/virt.c
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index f20775f44c..e0de08e2c1 100644
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--- a/hw/arm/virt.c
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+++ b/hw/arm/virt.c
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@@ -261,7 +261,9 @@ static void create_fdt(VirtMachineState *vms)
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/* /chosen must exist for load_dtb to fill in necessary properties later */
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qemu_fdt_add_subnode(fdt, "/chosen");
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- create_kaslr_seed(ms, "/chosen");
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+ if (!virtcca_cvm_enabled()) {
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+ create_kaslr_seed(ms, "/chosen");
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+ }
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if (vms->secure) {
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qemu_fdt_add_subnode(fdt, "/secure-chosen");
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--
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2.31.1.windows.1
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