This patch implements the VMPTRST instruction.
Signed-off-by: Nadav Har'El <nyh@xxxxxxxxxx>
---
arch/x86/kvm/vmx.c | 27 ++++++++++++++++++++++++++-
arch/x86/kvm/x86.c | 3 ++-
arch/x86/kvm/x86.h | 3 +++
3 files changed, 31 insertions(+), 2 deletions(-)
--- .before/arch/x86/kvm/x86.c 2011-01-26 18:06:04.000000000 +0200
+++ .after/arch/x86/kvm/x86.c 2011-01-26 18:06:04.000000000 +0200
@@ -3703,7 +3703,7 @@ static int kvm_read_guest_virt_system(gv
return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, 0, exception);
}
-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,
struct x86_exception *exception)
@@ -3734,6 +3734,7 @@ 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 2011-01-26 18:06:04.000000000 +0200
+++ .after/arch/x86/kvm/x86.h 2011-01-26 18:06:04.000000000 +0200
@@ -82,6 +82,9 @@ int kvm_inject_realmode_interrupt(struct
int kvm_read_guest_virt(gva_t addr, void *val, unsigned int bytes,
struct kvm_vcpu *vcpu, struct x86_exception *exception);
+int kvm_write_guest_virt_system(gva_t addr, void *val, unsigned int bytes,
+ struct kvm_vcpu *vcpu, struct x86_exception *exception);
+
void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data);
#endif
--- .before/arch/x86/kvm/vmx.c 2011-01-26 18:06:04.000000000 +0200
+++ .after/arch/x86/kvm/vmx.c 2011-01-26 18:06:04.000000000 +0200
@@ -4705,6 +4705,31 @@ static int handle_vmptrld(struct kvm_vcp
return 1;
}
+/* Emulate the VMPTRST instruction */
+static int handle_vmptrst(struct kvm_vcpu *vcpu)
+{
+ 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;
+
+ if (get_vmx_mem_address(vcpu, exit_qualification,
+ vmx_instruction_info, &vmcs_gva))
+ return 1;
+ /* ok to use *_system, because handle_vmread verified cpl=0 */
+ if (kvm_write_guest_virt_system(vmcs_gva,
+ (void *)&to_vmx(vcpu)->nested.current_vmptr,
+ sizeof(u64), vcpu, NULL)) {
+ kvm_queue_exception(vcpu, PF_VECTOR);
+ return 1;
+ }
+ nested_vmx_succeed(vcpu);
+ skip_emulated_instruction(vcpu);
+ return 1;
+}
+
/*
* The exit handlers return 1 if the exit was handled fully and guest execution
* may resume. Otherwise they set the kvm_run parameter to indicate what needs
@@ -4729,7 +4754,7 @@ 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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