This patch implements the VMPTRST instruction.
Signed-off-by: Nadav Har'El <nyh@xxxxxxxxxx>
---
--- .before/arch/x86/kvm/x86.c 2010-06-13 15:01:29.000000000 +0300
+++ .after/arch/x86/kvm/x86.c 2010-06-13 15:01:29.000000000 +0300
@@ -3301,7 +3301,7 @@ static int kvm_read_guest_virt_system(gv
return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, 0, error);
}
-static int kvm_write_guest_virt_system(gva_t addr, void *val,
+int kvm_write_guest_virt_system(gva_t addr, void *val,
unsigned int bytes,
struct kvm_vcpu *vcpu,
u32 *error)
@@ -3333,6 +3333,7 @@ static int kvm_write_guest_virt_system(g
out:
return r;
}
+EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system);
static int emulator_read_emulated(unsigned long addr,
void *val,
--- .before/arch/x86/kvm/x86.h 2010-06-13 15:01:29.000000000 +0300
+++ .after/arch/x86/kvm/x86.h 2010-06-13 15:01:29.000000000 +0300
@@ -78,6 +78,9 @@ void kvm_after_handle_nmi(struct kvm_vcp
int kvm_read_guest_virt(gva_t addr, void *val, unsigned int bytes,
struct kvm_vcpu *vcpu, u32 *error);
+int kvm_write_guest_virt_system(gva_t addr, void *val, unsigned int bytes,
+ struct kvm_vcpu *vcpu, u32 *error);
+
extern int nested;
#endif
--- .before/arch/x86/kvm/vmx.c 2010-06-13 15:01:29.000000000 +0300
+++ .after/arch/x86/kvm/vmx.c 2010-06-13 15:01:29.000000000 +0300
@@ -3940,6 +3940,33 @@ static int handle_vmptrld(struct kvm_vcp
return 1;
}
+/* Emulate the VMPTRST instruction */
+static int handle_vmptrst(struct kvm_vcpu *vcpu)
+{
+ int r = 0;
+ unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
+ u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
+ gva_t vmcs_gva;
+
+ if (!nested_vmx_check_permission(vcpu))
+ return 1;
+
+ vmcs_gva = get_vmx_mem_address(vcpu, exit_qualification,
+ vmx_instruction_info);
+ if (vmcs_gva == 0)
+ return 1;
+ r = kvm_write_guest_virt_system(vmcs_gva,
+ (void *)&to_vmx(vcpu)->nested.current_vmptr,
+ sizeof(u64), vcpu, NULL);
+ if (r) {
+ printk(KERN_INFO "%s failed to write vmptr\n", __func__);
+ return 1;
+ }
+ clear_rflags_cf_zf(vcpu);
+ skip_emulated_instruction(vcpu);
+ return 1;
+}
+
static int handle_invlpg(struct kvm_vcpu *vcpu)
{
unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
@@ -4225,7 +4252,7 @@ static int (*kvm_vmx_exit_handlers[])(st
[EXIT_REASON_VMCLEAR] = handle_vmclear,
[EXIT_REASON_VMLAUNCH] = handle_vmx_insn,
[EXIT_REASON_VMPTRLD] = handle_vmptrld,
- [EXIT_REASON_VMPTRST] = handle_vmx_insn,
+ [EXIT_REASON_VMPTRST] = handle_vmptrst,
[EXIT_REASON_VMREAD] = handle_vmx_insn,
[EXIT_REASON_VMRESUME] = handle_vmx_insn,
[EXIT_REASON_VMWRITE] = handle_vmx_insn,
--
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