Messages in this thread Patch in this message | | | Subject | [PATCH] KVM: Fix steal time asm constraints in 32-bit mode | From | David Woodhouse <> | Date | Sun, 14 Nov 2021 08:59:02 +0000 |
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From: David Woodhouse <dwmw@amazon.co.uk>
In 64-bit mode, x86 instruction encoding allows us to use the low 8 bits of any GPR as an 8-bit operand. In 32-bit mode, however, we can only use the [abcd] registers. For which, GCC has the "q" constraint instead of the less restrictive "r".
Fixes: 7e2175ebd695 ("KVM: x86: Fix recording of guest steal time / preempted status") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> --- arch/x86/kvm/x86.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 8f156905ae38..0a689bb62e9e 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3307,7 +3307,7 @@ static void record_steal_time(struct kvm_vcpu *vcpu) "xor %1, %1\n" "2:\n" _ASM_EXTABLE_UA(1b, 2b) - : "+r" (st_preempted), + : "+q" (st_preempted), "+&r" (err) : "m" (st->preempted)); if (err) -- 2.25.1 [unhandled content-type:application/pkcs7-signature] | |