From e52de1b8cf85aa2ccaaa253b4397c6d6cc0d4897 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Fri, 5 Jan 2007 16:36:56 -0800 Subject: [PATCH] [PATCH] KVM: Improve reporting of vmwrite errors This will allow us to see the root cause when a vmwrite error happens. Signed-off-by: Avi Kivity Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/kvm/vmx.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c index ed3956739771..779d8fc07d31 100644 --- a/drivers/kvm/vmx.c +++ b/drivers/kvm/vmx.c @@ -152,15 +152,21 @@ static u64 vmcs_read64(unsigned long field) #endif } +static noinline void vmwrite_error(unsigned long field, unsigned long value) +{ + printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n", + field, value, vmcs_read32(VM_INSTRUCTION_ERROR)); + dump_stack(); +} + static void vmcs_writel(unsigned long field, unsigned long value) { u8 error; asm volatile (ASM_VMX_VMWRITE_RAX_RDX "; setna %0" : "=q"(error) : "a"(value), "d"(field) : "cc" ); - if (error) - printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n", - field, value, vmcs_read32(VM_INSTRUCTION_ERROR)); + if (unlikely(error)) + vmwrite_error(field, value); } static void vmcs_write16(unsigned long field, u16 value) -- 2.20.1