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KVM: svm: set/clear all DR intercepts in one swoop

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Unlike other intercepts, debug register intercepts will be modified
in hot paths if the guest OS is bad or otherwise gets tricked into
doing so.

Avoid calling recalc_intercepts 16 times for debug registers.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-03-03 13:08:29 +01:00
parent d16c293e4e
commit 5315c716b6
1 changed files with 20 additions and 21 deletions
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41
arch/x86/kvm/svm.c
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@ -303,20 +303,35 @@ static inline bool is_cr_intercept(struct vcpu_svm *svm, int bit)
return vmcb->control.intercept_cr & (1U << bit);
}
static inline void set_dr_intercept(struct vcpu_svm *svm, int bit)
static inline void set_dr_intercepts(struct vcpu_svm *svm)
{
struct vmcb *vmcb = get_host_vmcb(svm);
vmcb->control.intercept_dr |= (1U << bit);
vmcb->control.intercept_dr = (1 << INTERCEPT_DR0_READ)
| (1 << INTERCEPT_DR1_READ)
| (1 << INTERCEPT_DR2_READ)
| (1 << INTERCEPT_DR3_READ)
| (1 << INTERCEPT_DR4_READ)
| (1 << INTERCEPT_DR5_READ)
| (1 << INTERCEPT_DR6_READ)
| (1 << INTERCEPT_DR7_READ)
| (1 << INTERCEPT_DR0_WRITE)
| (1 << INTERCEPT_DR1_WRITE)
| (1 << INTERCEPT_DR2_WRITE)
| (1 << INTERCEPT_DR3_WRITE)
| (1 << INTERCEPT_DR4_WRITE)
| (1 << INTERCEPT_DR5_WRITE)
| (1 << INTERCEPT_DR6_WRITE)
| (1 << INTERCEPT_DR7_WRITE);
recalc_intercepts(svm);
}
static inline void clr_dr_intercept(struct vcpu_svm *svm, int bit)
static inline void clr_dr_intercepts(struct vcpu_svm *svm)
{
struct vmcb *vmcb = get_host_vmcb(svm);
vmcb->control.intercept_dr &= ~(1U << bit);
vmcb->control.intercept_dr = 0;
recalc_intercepts(svm);
}
@ -1080,23 +1095,7 @@ static void init_vmcb(struct vcpu_svm *svm)
set_cr_intercept(svm, INTERCEPT_CR4_WRITE);
set_cr_intercept(svm, INTERCEPT_CR8_WRITE);
set_dr_intercept(svm, INTERCEPT_DR0_READ);
set_dr_intercept(svm, INTERCEPT_DR1_READ);
set_dr_intercept(svm, INTERCEPT_DR2_READ);
set_dr_intercept(svm, INTERCEPT_DR3_READ);
set_dr_intercept(svm, INTERCEPT_DR4_READ);
set_dr_intercept(svm, INTERCEPT_DR5_READ);
set_dr_intercept(svm, INTERCEPT_DR6_READ);
set_dr_intercept(svm, INTERCEPT_DR7_READ);
set_dr_intercept(svm, INTERCEPT_DR0_WRITE);
set_dr_intercept(svm, INTERCEPT_DR1_WRITE);
set_dr_intercept(svm, INTERCEPT_DR2_WRITE);
set_dr_intercept(svm, INTERCEPT_DR3_WRITE);
set_dr_intercept(svm, INTERCEPT_DR4_WRITE);
set_dr_intercept(svm, INTERCEPT_DR5_WRITE);
set_dr_intercept(svm, INTERCEPT_DR6_WRITE);
set_dr_intercept(svm, INTERCEPT_DR7_WRITE);
set_dr_intercepts(svm);
set_exception_intercept(svm, PF_VECTOR);
set_exception_intercept(svm, UD_VECTOR);