qemu-kvm/SOURCES/kvm-qemu-options.hx-Update-the-reduced-phys-bits-documen.patch
2023-11-07 09:43:59 +00:00

61 lines
2.3 KiB
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From 50c833fc3c7d8d3a5124cfdb2f2dc06b910c2252 Mon Sep 17 00:00:00 2001
From: Bandan Das <bsd@redhat.com>
Date: Thu, 3 Aug 2023 14:21:25 -0400
Subject: [PATCH 11/14] qemu-options.hx: Update the reduced-phys-bits
documentation
RH-Author: Bandan Das <None>
RH-MergeRequest: 196: Updates to SEV reduced-phys-bits parameter
RH-Bugzilla: 2214839
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [2/4] b0c4a19e9f4185c97ddf71857bc9367cea01ffa8 (bdas1/qemu-kvm)
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2214839
commit 326e3015c4c6f3197157ea0bb00826ae740e2fad
Author: Tom Lendacky <thomas.lendacky@amd.com>
Date: Fri Sep 30 10:14:28 2022 -0500
qemu-options.hx: Update the reduced-phys-bits documentation
A guest only ever experiences, at most, 1 bit of reduced physical
addressing. Update the documentation to reflect this as well as change
the example value on the reduced-phys-bits option.
Fixes: a9b4942f48 ("target/i386: add Secure Encrypted Virtualization (SEV) object")
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <13a62ced1808546c1d398e2025cf85f4c94ae123.1664550870.git.thomas.lendacky@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Bandan Das <bsd@redhat.com>
---
qemu-options.hx | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/qemu-options.hx b/qemu-options.hx
index b18f933703..edf10a5aac 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -5417,7 +5417,7 @@ SRST
physical address space. The ``reduced-phys-bits`` is used to
provide the number of bits we loose in physical address space.
Similar to C-bit, the value is Host family dependent. On EPYC,
- the value should be 5.
+ a guest will lose a maximum of 1 bit, so the value should be 1.
The ``sev-device`` provides the device file to use for
communicating with the SEV firmware running inside AMD Secure
@@ -5452,7 +5452,7 @@ SRST
# |qemu_system_x86| \\
...... \\
- -object sev-guest,id=sev0,cbitpos=47,reduced-phys-bits=5 \\
+ -object sev-guest,id=sev0,cbitpos=47,reduced-phys-bits=1 \\
-machine ...,memory-encryption=sev0 \\
.....
--
2.39.3