[PATCH 9/9] KVM: SVM: Remove nested sel_cr0_write handling code

[Joerg Roedel]

This patch removes all the old code which handled the nested
selective cr0 write intercepts. This code was only in place
as a work-around until the instruction emulator is capable
of doing the same. This is the case with this patch-set and
so the code can be removed.

Signed-off-by: Joerg Roedel <joerg.roedel@xxxxxxx>
---
 arch/x86/kvm/svm.c |   52 +---------------------------------------------------
 1 files changed, 1 insertions(+), 51 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index a2c513d..b34e905 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -89,14 +89,6 @@ struct nested_state {
 	/* A VMEXIT is required but not yet emulated */
 	bool exit_required;
 
-	/*
-	 * If we vmexit during an instruction emulation we need this to restore
-	 * the l1 guest rip after the emulation
-	 */
-	unsigned long vmexit_rip;
-	unsigned long vmexit_rsp;
-	unsigned long vmexit_rax;
-
 	/* cache for intercepts of the guest */
 	u16 intercept_cr_read;
 	u16 intercept_cr_write;
@@ -1233,31 +1225,6 @@ static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
 
-	if (is_nested(svm)) {
-		/*
-		 * We are here because we run in nested mode, the host kvm
-		 * intercepts cr0 writes but the l1 hypervisor does not.
-		 * But the L1 hypervisor may intercept selective cr0 writes.
-		 * This needs to be checked here.
-		 */
-		unsigned long old, new;
-
-		/* Remove bits that would trigger a real cr0 write intercept */
-		old = vcpu->arch.cr0 & SVM_CR0_SELECTIVE_MASK;
-		new = cr0 & SVM_CR0_SELECTIVE_MASK;
-
-		if (old == new) {
-			/* cr0 write with ts and mp unchanged */
-			svm->vmcb->control.exit_code = SVM_EXIT_CR0_SEL_WRITE;
-			if (nested_svm_exit_handled(svm) == NESTED_EXIT_DONE) {
-				svm->nested.vmexit_rip = kvm_rip_read(vcpu);
-				svm->nested.vmexit_rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
-				svm->nested.vmexit_rax = kvm_register_read(vcpu, VCPU_REGS_RAX);
-				return;
-			}
-		}
-	}
-
 #ifdef CONFIG_X86_64
 	if (vcpu->arch.efer & EFER_LME) {
 		if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
@@ -2546,23 +2513,6 @@ static int emulate_on_interception(struct vcpu_svm *svm)
 	return emulate_instruction(&svm->vcpu, 0, 0, 0) == EMULATE_DONE;
 }
 
-static int cr0_write_interception(struct vcpu_svm *svm)
-{
-	struct kvm_vcpu *vcpu = &svm->vcpu;
-	int r;
-
-	r = emulate_instruction(&svm->vcpu, 0, 0, 0);
-
-	if (svm->nested.vmexit_rip) {
-		kvm_register_write(vcpu, VCPU_REGS_RIP, svm->nested.vmexit_rip);
-		kvm_register_write(vcpu, VCPU_REGS_RSP, svm->nested.vmexit_rsp);
-		kvm_register_write(vcpu, VCPU_REGS_RAX, svm->nested.vmexit_rax);
-		svm->nested.vmexit_rip = 0;
-	}
-
-	return r == EMULATE_DONE;
-}
-
 static int cr8_write_interception(struct vcpu_svm *svm)
 {
 	struct kvm_run *kvm_run = svm->vcpu.run;
@@ -2826,7 +2776,7 @@ static int (*svm_exit_handlers[])(struct vcpu_svm *svm) = {
 	[SVM_EXIT_READ_CR4]			= emulate_on_interception,
 	[SVM_EXIT_READ_CR8]			= emulate_on_interception,
 	[SVM_EXIT_CR0_SEL_WRITE]		= emulate_on_interception,
-	[SVM_EXIT_WRITE_CR0]			= cr0_write_interception,
+	[SVM_EXIT_WRITE_CR0]			= emulate_on_interception,
 	[SVM_EXIT_WRITE_CR3]			= emulate_on_interception,
 	[SVM_EXIT_WRITE_CR4]			= emulate_on_interception,
 	[SVM_EXIT_WRITE_CR8]			= cr8_write_interception,
-- 
1.7.1


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