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Paolo Bonzini 3d4a058945 KVM: SVM: relax conditions for allowing MSR_IA32_SPEC_CTRL accesses 
[ Upstream commit df7e8818926eb4712b67421442acf7d568fe2645 ]

Userspace that does not know about the AMD_IBRS bit might still
allow the guest to protect itself with MSR_IA32_SPEC_CTRL using
the Intel SPEC_CTRL bit.  However, svm.c disallows this and will
cause a #GP in the guest when writing to the MSR.  Fix this by
loosening the test and allowing the Intel CPUID bit, and in fact
allow the AMD_STIBP bit as well since it allows writing to
MSR_IA32_SPEC_CTRL too.

Reported-by: Zhiyi Guo <zhguo@redhat.com>
Analyzed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Analyzed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-01-06 14:48:36 +01:00
..
alpha
alpha: fix annotation of io{read,write}{16,32}be()
2020-08-26 10:40:58 +02:00
arc
ARC: stack unwinding: don't assume non-current task is sleeping
2020-12-16 10:56:55 +01:00
arm
ARM: dts: at91: sama5d2: fix CAN message ram offset and size
2020-12-30 11:51:38 +01:00
arm64
KVM: arm64: Introduce handling of AArch32 TTBCR2 traps
2020-12-30 11:51:38 +01:00
c6x
mm: consolidate pgtable_cache_init() and pgd_cache_init()
2019-09-24 15:54:09 -07:00
csky
csky: Fixup abiv2 syscall_trace break a4 & a5
2020-06-17 16:40:21 +02:00
h8300
mm: consolidate pgtable_cache_init() and pgd_cache_init()
2019-09-24 15:54:09 -07:00
hexagon
hexagon: define ioremap_uc
2020-05-10 10:31:31 +02:00
ia64
ia64: fix build error with !COREDUMP
2020-11-05 11:43:33 +01:00
m68k
m68k: q40: Fix info-leak in rtc_ioctl
2020-10-01 13:17:12 +02:00
microblaze
microblaze: Prevent the overflow of the start
2020-02-24 08:37:02 +01:00
mips
MIPS: Don't round up kernel sections size for memblock_add()
2020-12-30 11:51:18 +01:00
nds32
asm-generic/nds32: don't redefine cacheflush primitives
2020-01-17 19:48:43 +01:00
nios2
nios2 update for v5.4-rc1
2019-09-27 13:02:19 -07:00
openrisc
openrisc: Fix issue with get_user for 64-bit values
2020-11-01 12:01:06 +01:00
parisc
kbuild: fix broken builds because of GZIP,BZIP2,LZOP variables
2020-09-03 11:27:10 +02:00
powerpc
powerpc/powernv/memtrace: Fix crashing the kernel when enabling concurrently
2020-12-30 11:51:39 +01:00
riscv
arch: pgtable: define MAX_POSSIBLE_PHYSMEM_BITS where needed
2020-12-02 08:49:50 +01:00
s390
s390/kexec_file: fix diag308 subcode when loading crash kernel
2020-12-30 11:51:34 +01:00
sh
sh: landisk: Add missing initialization of sh_io_port_base
2020-08-21 13:05:38 +02:00
sparc
sparc: fix handling of page table constructor failure
2020-12-30 11:51:26 +01:00
um
um: Remove use of asprinf in umid.c
2020-12-30 11:51:39 +01:00
unicore32
mm: treewide: clarify pgtable_page_{ctor,dtor}() naming
2019-09-26 10:10:44 -07:00
x86
KVM: SVM: relax conditions for allowing MSR_IA32_SPEC_CTRL accesses
2021-01-06 14:48:36 +01:00
xtensa
xtensa: uaccess: Add missing __user to strncpy_from_user() prototype
2020-12-02 08:49:49 +01:00
.gitignore
…
Kconfig
Revert: "ring-buffer: Remove HAVE_64BIT_ALIGNED_ACCESS"
2020-12-30 11:51:47 +01:00