[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[RFC PATCH 0/7] Support protection keys in an AMD EPYC-Milan VM
From: |
David Edmondson |
Subject: |
[RFC PATCH 0/7] Support protection keys in an AMD EPYC-Milan VM |
Date: |
Thu, 20 May 2021 15:56:40 +0100 |
AMD EPYC-Milan CPUs introduced support for protection keys, previously
available only with Intel CPUs.
AMD chose to place the XSAVE state component for the protection keys
at a different offset in the XSAVE state area than that chosen by
Intel.
To accommodate this, modify QEMU to behave appropriately on AMD
systems, allowing a VM to properly take advantage of the new feature.
Further, avoid manipulating XSAVE state components that are not
present on AMD systems.
The code in patch 6 that changes the CPUID 0x0d leaf is mostly dumped
somewhere that seemed to work - I'm not sure where it really belongs.
David Edmondson (7):
target/i386: Declare constants for XSAVE offsets
target/i386: Use constants for XSAVE offsets
target/i386: Clarify the padding requirements of X86XSaveArea
target/i386: Prepare for per-vendor X86XSaveArea layout
target/i386: Introduce AMD X86XSaveArea sub-union
target/i386: Adjust AMD XSAVE PKRU area offset in CPUID leaf 0xd
target/i386: Manipulate only AMD XSAVE state on AMD
target/i386/cpu.c | 19 +++++----
target/i386/cpu.h | 80 ++++++++++++++++++++++++++++--------
target/i386/kvm/kvm.c | 57 +++++++++----------------
target/i386/tcg/fpu_helper.c | 20 ++++++---
target/i386/xsave_helper.c | 70 +++++++++++++++++++------------
5 files changed, 152 insertions(+), 94 deletions(-)
--
2.30.2
- [RFC PATCH 0/7] Support protection keys in an AMD EPYC-Milan VM,
David Edmondson <=
- [RFC PATCH 1/7] target/i386: Declare constants for XSAVE offsets, David Edmondson, 2021/05/20
- [RFC PATCH 3/7] target/i386: Clarify the padding requirements of X86XSaveArea, David Edmondson, 2021/05/20
- [RFC PATCH 4/7] target/i386: Prepare for per-vendor X86XSaveArea layout, David Edmondson, 2021/05/20
- [RFC PATCH 5/7] target/i386: Introduce AMD X86XSaveArea sub-union, David Edmondson, 2021/05/20
- [RFC PATCH 6/7] target/i386: Adjust AMD XSAVE PKRU area offset in CPUID leaf 0xd, David Edmondson, 2021/05/20
- [RFC PATCH 2/7] target/i386: Use constants for XSAVE offsets, David Edmondson, 2021/05/20
- [RFC PATCH 7/7] target/i386: Manipulate only AMD XSAVE state on AMD, David Edmondson, 2021/05/20
- Re: [RFC PATCH 0/7] Support protection keys in an AMD EPYC-Milan VM, no-reply, 2021/05/20