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Commit 989e3992 authored by Konrad Rzeszutek Wilk's avatar Konrad Rzeszutek Wilk Committed by Thomas Gleixner
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x86/KVM/VMX: Extend add_atomic_switch_msr() to allow VMENTER only MSRs 



The IA32_FLUSH_CMD MSR needs only to be written on VMENTER. Extend
add_atomic_switch_msr() with an entry_only parameter to allow storing the
MSR only in the guest (ENTRY) MSR array.

Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 31907093

arch/x86/kvm/vmx.c

+14 −8
Original line number Diff line number Diff line
@@ -2484,9 +2484,9 @@ static void add_atomic_switch_msr_special(struct vcpu_vmx *vmx, 
}



static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,

				  u64 guest_val, u64 host_val)

				  u64 guest_val, u64 host_val, bool entry_only)

{

	int i, j;

	int i, j = 0;

	struct msr_autoload *m = &vmx->msr_autoload;



	switch (msr) {
@@ -2522,7 +2522,9 @@ static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr, 
	}



	i = find_msr(&m->guest, msr);

	if (!entry_only)

		j = find_msr(&m->host, msr);



	if (i == NR_AUTOLOAD_MSRS || j == NR_AUTOLOAD_MSRS) {

		printk_once(KERN_WARNING "Not enough msr switch entries. "

				"Can't add msr %x\n", msr);
@@ -2532,12 +2534,16 @@ static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr, 
		i = m->guest.nr++;

		vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->guest.nr);

	}

	m->guest.val[i].index = msr;

	m->guest.val[i].value = guest_val;



	if (entry_only)

		return;



	if (j < 0) {

		j = m->host.nr++;

		vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->host.nr);

	}

	m->guest.val[i].index = msr;

	m->guest.val[i].value = guest_val;

	m->host.val[j].index = msr;

	m->host.val[j].value = host_val;

}
@@ -2583,7 +2589,7 @@ static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset) 
			guest_efer &= ~EFER_LME;

		if (guest_efer != host_efer)

			add_atomic_switch_msr(vmx, MSR_EFER,

					      guest_efer, host_efer);

					      guest_efer, host_efer, false);

		return false;

	} else {

		guest_efer &= ~ignore_bits;
@@ -4037,7 +4043,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 
		vcpu->arch.ia32_xss = data;

		if (vcpu->arch.ia32_xss != host_xss)

			add_atomic_switch_msr(vmx, MSR_IA32_XSS,

				vcpu->arch.ia32_xss, host_xss);

				vcpu->arch.ia32_xss, host_xss, false);

		else

			clear_atomic_switch_msr(vmx, MSR_IA32_XSS);

		break;
@@ -10040,7 +10046,7 @@ static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx) 
			clear_atomic_switch_msr(vmx, msrs[i].msr);

		else

			add_atomic_switch_msr(vmx, msrs[i].msr, msrs[i].guest,

					msrs[i].host);

					msrs[i].host, false);

}



static void vmx_arm_hv_timer(struct kvm_vcpu *vcpu)