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62 lines
2.4 KiB
62 lines
2.4 KiB
9 months ago
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From 095811c08557b0a2ad1a433d28699ead1e5ef664 Mon Sep 17 00:00:00 2001
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From: Bandan Das <bsd@redhat.com>
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Date: Thu, 3 Aug 2023 15:12:15 -0400
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Subject: [PATCH 2/5] qemu-options.hx: Update the reduced-phys-bits
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documentation
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RH-Author: Bandan Das <None>
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RH-MergeRequest: 296: Updates to SEV reduced-phys-bits parameter
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RH-Bugzilla: 2214840
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RH-Acked-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
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RH-Acked-by: Vitaly Kuznetsov <vkuznets@redhat.com>
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RH-Commit: [2/4] f8e8f5aeff449a34ce90c6e55e2a51873a6e6a87
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2214840
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commit 326e3015c4c6f3197157ea0bb00826ae740e2fad
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Author: Tom Lendacky <thomas.lendacky@amd.com>
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Date: Fri Sep 30 10:14:28 2022 -0500
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qemu-options.hx: Update the reduced-phys-bits documentation
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A guest only ever experiences, at most, 1 bit of reduced physical
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addressing. Update the documentation to reflect this as well as change
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the example value on the reduced-phys-bits option.
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Fixes: a9b4942f48 ("target/i386: add Secure Encrypted Virtualization (SEV) object")
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Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
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Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Message-Id: <13a62ced1808546c1d398e2025cf85f4c94ae123.1664550870.git.thomas.lendacky@amd.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Signed-off-by: Bandan Das <bsd@redhat.com>
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---
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qemu-options.hx | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/qemu-options.hx b/qemu-options.hx
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index 4b7798088b..981248e283 100644
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--- a/qemu-options.hx
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+++ b/qemu-options.hx
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@@ -5204,7 +5204,7 @@ SRST
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physical address space. The ``reduced-phys-bits`` is used to
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provide the number of bits we loose in physical address space.
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Similar to C-bit, the value is Host family dependent. On EPYC,
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- the value should be 5.
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+ a guest will lose a maximum of 1 bit, so the value should be 1.
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The ``sev-device`` provides the device file to use for
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communicating with the SEV firmware running inside AMD Secure
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@@ -5239,7 +5239,7 @@ SRST
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# |qemu_system_x86| \\
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...... \\
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- -object sev-guest,id=sev0,cbitpos=47,reduced-phys-bits=5 \\
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+ -object sev-guest,id=sev0,cbitpos=47,reduced-phys-bits=1 \\
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-machine ...,memory-encryption=sev0 \\
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.....
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--
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2.37.3
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