Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

KVM: VMX: Fold __vmx_vcpu_run() into vmx_vcpu_run()

Browse source 
cea15c2 ("KVM: Move KVM context switch into own function") split vmx_vcpu_run()
to prevent multiple copies of the context switch from being generated (causing
problems due to a label).  This patch folds them back together again and adds
the __noclone attribute to prevent the label from being duplicated.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-11-18 13:12:52 +02:00
parent 30b31ab682
commit 104f226bfd
1 changed files with 25 additions and 38 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

63
arch/x86/kvm/vmx.c
View file

@ -3904,17 +3904,33 @@ static void vmx_cancel_injection(struct kvm_vcpu *vcpu)
#define Q "l" #define Q "l"
#endif #endif
/* static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
* We put this into a separate noinline function to prevent the compiler
* from duplicating the code. This is needed because this code
* uses non local labels that cannot be duplicated.
* Do not put any flow control into this function.
* Better would be to put this whole monstrosity into a .S file.
*/
static void noinline do_vmx_vcpu_run(struct kvm_vcpu *vcpu)
{ {
struct vcpu_vmx *vmx = to_vmx(vcpu); struct vcpu_vmx *vmx = to_vmx(vcpu);
asm volatile(
/* Record the guest's net vcpu time for enforced NMI injections. */
if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))
vmx->entry_time = ktime_get();
/* Don't enter VMX if guest state is invalid, let the exit handler
start emulation until we arrive back to a valid state */
if (vmx->emulation_required && emulate_invalid_guest_state)
return;
if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);
/* When single-stepping over STI and MOV SS, we must clear the
* corresponding interruptibility bits in the guest state. Otherwise
* vmentry fails as it then expects bit 14 (BS) in pending debug
* exceptions being set, but that's not correct for the guest debugging
* case. */
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
vmx_set_interrupt_shadow(vcpu, 0);
asm(
/* Store host registers */ /* Store host registers */
"push %%"R"dx; push %%"R"bp;" "push %%"R"dx; push %%"R"bp;"
"push %%"R"cx \n\t" "push %%"R"cx \n\t"
@ -4009,35 +4025,6 @@ static void noinline do_vmx_vcpu_run(struct kvm_vcpu *vcpu)
, "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15" , "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
#endif #endif
); );
}
static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
/* Record the guest's net vcpu time for enforced NMI injections. */
if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))
vmx->entry_time = ktime_get();
/* Don't enter VMX if guest state is invalid, let the exit handler
start emulation until we arrive back to a valid state */
if (vmx->emulation_required && emulate_invalid_guest_state)
return;
if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);
/* When single-stepping over STI and MOV SS, we must clear the
* corresponding interruptibility bits in the guest state. Otherwise
* vmentry fails as it then expects bit 14 (BS) in pending debug
* exceptions being set, but that's not correct for the guest debugging
* case. */
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
vmx_set_interrupt_shadow(vcpu, 0);
do_vmx_vcpu_run(vcpu);
vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP) vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP)
| (1 << VCPU_EXREG_PDPTR)); | (1 << VCPU_EXREG_PDPTR));