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KVM: Rationalize exception bitmap usage 

Everyone owns a piece of the exception bitmap, but they happily write to
the entire thing like there's no tomorrow.  Centralize handling in
update_exception_bitmap() and have everyone call that.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2007-05-02 17:57:40 +03:00
parent 707c087430
commit abd3f2d622
1 changed files with 21 additions and 21 deletions
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42
drivers/kvm/vmx.c
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@ -237,6 +237,20 @@ static void vmcs_set_bits(unsigned long field, u32 mask)
vmcs_writel(field, vmcs_readl(field) | mask);
}
static void update_exception_bitmap(struct kvm_vcpu *vcpu)
{
u32 eb;
eb = 1u << PF_VECTOR;
if (!vcpu->fpu_active)
eb |= 1u << NM_VECTOR;
if (vcpu->guest_debug.enabled)
eb |= 1u << 1;
if (vcpu->rmode.active)
eb = ~0;
vmcs_write32(EXCEPTION_BITMAP, eb);
}
static void reload_tss(void)
{
#ifndef CONFIG_X86_64
@ -618,10 +632,8 @@ static void vcpu_put_rsp_rip(struct kvm_vcpu *vcpu)
static int set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_debug_guest *dbg)
{
unsigned long dr7 = 0x400;
u32 exception_bitmap;
int old_singlestep;
exception_bitmap = vmcs_read32(EXCEPTION_BITMAP);
old_singlestep = vcpu->guest_debug.singlestep;
vcpu->guest_debug.enabled = dbg->enabled;
@ -637,13 +649,9 @@ static int set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_debug_guest *dbg)
dr7 |= 0 << (i*4+16); /* execution breakpoint */
}
exception_bitmap |= (1u << 1); /* Trap debug exceptions */
vcpu->guest_debug.singlestep = dbg->singlestep;
} else {
exception_bitmap &= ~(1u << 1); /* Ignore debug exceptions */
} else
vcpu->guest_debug.singlestep = 0;
}
if (old_singlestep && !vcpu->guest_debug.singlestep) {
unsigned long flags;
@ -653,7 +661,7 @@ static int set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_debug_guest *dbg)
vmcs_writel(GUEST_RFLAGS, flags);
}
vmcs_write32(EXCEPTION_BITMAP, exception_bitmap);
update_exception_bitmap(vcpu);
vmcs_writel(GUEST_DR7, dr7);
return 0;
@ -767,14 +775,6 @@ static __exit void hardware_unsetup(void)
free_kvm_area();
}
static void update_exception_bitmap(struct kvm_vcpu *vcpu)
{
if (vcpu->rmode.active)
vmcs_write32(EXCEPTION_BITMAP, ~0);
else
vmcs_write32(EXCEPTION_BITMAP, 1 << PF_VECTOR);
}
static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
{
struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
@ -942,7 +942,7 @@ static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
if (!(cr0 & CR0_TS_MASK)) {
vcpu->fpu_active = 1;
vmcs_clear_bits(EXCEPTION_BITMAP, CR0_TS_MASK);
update_exception_bitmap(vcpu);
}
vmcs_writel(CR0_READ_SHADOW, cr0);
@ -958,7 +958,7 @@ static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
if (!(vcpu->cr0 & CR0_TS_MASK)) {
vcpu->fpu_active = 0;
vmcs_set_bits(GUEST_CR0, CR0_TS_MASK);
vmcs_set_bits(EXCEPTION_BITMAP, 1 << NM_VECTOR);
update_exception_bitmap(vcpu);
}
}
@ -1243,7 +1243,6 @@ static int vmx_vcpu_setup(struct kvm_vcpu *vcpu)
| CPU_BASED_USE_TSC_OFFSETING /* 21.3 */
);
vmcs_write32(EXCEPTION_BITMAP, 1 << PF_VECTOR);
vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0);
vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, 0);
vmcs_write32(CR3_TARGET_COUNT, 0); /* 22.2.1 */
@ -1329,6 +1328,7 @@ static int vmx_vcpu_setup(struct kvm_vcpu *vcpu)
#ifdef CONFIG_X86_64
vmx_set_efer(vcpu, 0);
#endif
update_exception_bitmap(vcpu);
return 0;
@ -1489,7 +1489,7 @@ static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
if (is_no_device(intr_info)) {
vcpu->fpu_active = 1;
vmcs_clear_bits(EXCEPTION_BITMAP, 1 << NM_VECTOR);
update_exception_bitmap(vcpu);
if (!(vcpu->cr0 & CR0_TS_MASK))
vmcs_clear_bits(GUEST_CR0, CR0_TS_MASK);
return 1;
@ -1684,7 +1684,7 @@ static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
case 2: /* clts */
vcpu_load_rsp_rip(vcpu);
vcpu->fpu_active = 1;
vmcs_clear_bits(EXCEPTION_BITMAP, 1 << NM_VECTOR);
update_exception_bitmap(vcpu);
vmcs_clear_bits(GUEST_CR0, CR0_TS_MASK);
vcpu->cr0 &= ~CR0_TS_MASK;
vmcs_writel(CR0_READ_SHADOW, vcpu->cr0);