The patch titled
kvm: fix calculation of initial value of rdx register
has been added to the -mm tree. Its filename is
kvm-fix-calculation-of-initial-value-of-rdx-register.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: kvm: fix calculation of initial value of rdx register
From: Avi Kivity <avi@xxxxxxxxxxxx>
On bootup, the rdx register contains information about the processor. The
function which calculates this value has the bugs:
- missing 'cpuid' to get the value from the processor
- missing register clobber caused a miscompilation in some circumstances
- we shouldn't return a value that depends on the current processor in
case we migrate
In any case nobody looks at the value, so just return a generic P6
identifier.
Thanks to Christian Hesse <mail@xxxxxxxxxxxx> for debugging help.
Signed-off-by: Avi Kivity <avi@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/kvm/kvm_main.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff -puN drivers/kvm/kvm_main.c~kvm-fix-calculation-of-initial-value-of-rdx-register drivers/kvm/kvm_main.c
--- a/drivers/kvm/kvm_main.c~kvm-fix-calculation-of-initial-value-of-rdx-register
+++ a/drivers/kvm/kvm_main.c
@@ -1052,12 +1052,7 @@ static void set_cr8(struct kvm_vcpu *vcp
static u32 get_rdx_init_val(void)
{
- u32 val;
-
- asm ("movl $1, %%eax \n\t"
- "movl %%eax, %0 \n\t" : "=g"(val) );
- return val;
-
+ return 0x600; /* P6 family */
}
static void fx_init(struct kvm_vcpu *vcpu)
_
Patches currently in -mm which might be from avi@xxxxxxxxxxxx are
kvm-userspace-interface.patch
kvm-intel-virtual-mode-extensions-definitions.patch
kvm-kvm-data-structures.patch
kvm-random-accessors-and-constants.patch
kvm-virtualization-infrastructure.patch
kvm-memory-slot-management.patch
kvm-vcpu-creation-and-maintenance.patch
kvm-vcpu-execution-loop.patch
kvm-define-exit-handlers.patch
kvm-less-common-exit-handlers.patch
kvm-mmu.patch
kvm-x86-emulator.patch
kvm-plumbing.patch
kvm-dynamically-determine-which-msrs-to-load-and-save.patch
kvm-fix-calculation-of-initial-value-of-rdx-register.patch
-
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