62 lines
2.4 KiB
Diff
62 lines
2.4 KiB
Diff
From 095811c08557b0a2ad1a433d28699ead1e5ef664 Mon Sep 17 00:00:00 2001
|
|
From: Bandan Das <bsd@redhat.com>
|
|
Date: Thu, 3 Aug 2023 15:12:15 -0400
|
|
Subject: [PATCH 2/5] qemu-options.hx: Update the reduced-phys-bits
|
|
documentation
|
|
|
|
RH-Author: Bandan Das <None>
|
|
RH-MergeRequest: 296: Updates to SEV reduced-phys-bits parameter
|
|
RH-Bugzilla: 2214840
|
|
RH-Acked-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
|
|
RH-Acked-by: Vitaly Kuznetsov <vkuznets@redhat.com>
|
|
RH-Commit: [2/4] f8e8f5aeff449a34ce90c6e55e2a51873a6e6a87
|
|
|
|
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2214840
|
|
|
|
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 4b7798088b..981248e283 100644
|
|
--- a/qemu-options.hx
|
|
+++ b/qemu-options.hx
|
|
@@ -5204,7 +5204,7 @@ 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
|
|
@@ -5239,7 +5239,7 @@ 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 \\
|
|
.....
|
|
|
|
--
|
|
2.37.3
|
|
|