On 2017-12-18 02:06 PM, Adalber Lazăr wrote:
From: Adalbert Lazar <alazar@xxxxxxxxxxxxxxx>
This is a version of kvm_arch_vcpu_ioctl_set_regs() which does not touch
the exceptions vector.
Signed-off-by: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
---
arch/x86/kvm/x86.c | 34 ++++++++++++++++++++++++++++++++++
include/linux/kvm_host.h | 1 +
2 files changed, 35 insertions(+)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e1a3c2c6ec08..4b0c3692386d 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7389,6 +7389,40 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
return 0;
}
+/*
+ * Similar to kvm_arch_vcpu_ioctl_set_regs() but it does not reset
+ * the exceptions
+ */
+void kvm_arch_vcpu_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
+{
+ vcpu->arch.emulate_regs_need_sync_from_vcpu = true;
+ vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
+
+ kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax);
+ kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx);
+ kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx);
+ kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx);
+ kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi);
+ kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi);
+ kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp);
+ kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp);
+#ifdef CONFIG_X86_64
+ kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8);
+ kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9);
+ kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10);
+ kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11);
+ kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12);
+ kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13);
+ kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14);
+ kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15);
+#endif
+
+ kvm_rip_write(vcpu, regs->rip);
+ kvm_set_rflags(vcpu, regs->rflags);
+
+ kvm_make_request(KVM_REQ_EVENT, vcpu);
+}
+
kvm_arch_vcpu_ioctl_set_regs() returns an int (so that, for e.g., in ARM
it can return an error to indicate that the function is not
supported/implemented). Is there a reason this function shouldn't do the
same (is it only ever going to be implemented for x86)?
void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
{
struct kvm_segment cs;
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 6bdd4b9f6611..68e4d756f5c9 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -767,6 +767,7 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
+void kvm_arch_vcpu_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs);
int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
Patrick
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