Il 09/09/2013 17:55, Arthur Chunqi Li ha scritto:
> This patch fix 3 bugs in VMX framework and EPT framework
> 1. Fix bug of setting default value of CPU_SECONDARY
> 2. Fix bug of reading MSR_IA32_VMX_PROCBASED_CTLS2 and
> MSR_IA32_VMX_EPT_VPID_CAP
> 3. For EPT violation and misconfiguration reduced vmexit, vmcs field
> "VM-exit instruction length" is not used and will return unexpected
> value when read.
>
> Signed-off-by: Arthur Chunqi Li <yzt356@xxxxxxxxx>
> ---
> x86/vmx.c | 13 ++++++++++---
> x86/vmx_tests.c | 2 --
> 2 files changed, 10 insertions(+), 5 deletions(-)
>
> diff --git a/x86/vmx.c b/x86/vmx.c
> index 87d1d55..9db4ef4 100644
> --- a/x86/vmx.c
> +++ b/x86/vmx.c
> @@ -304,7 +304,8 @@ static void init_vmcs_ctrl(void)
> /* Disable VMEXIT of IO instruction */
> vmcs_write(CPU_EXEC_CTRL0, ctrl_cpu[0]);
> if (ctrl_cpu_rev[0].set & CPU_SECONDARY) {
> - ctrl_cpu[1] |= ctrl_cpu_rev[1].set & ctrl_cpu_rev[1].clr;
> + ctrl_cpu[1] = (ctrl_cpu[1] | ctrl_cpu_rev[1].set) &
> + ctrl_cpu_rev[1].clr;
> vmcs_write(CPU_EXEC_CTRL1, ctrl_cpu[1]);
> }
> vmcs_write(CR3_TARGET_COUNT, 0);
> @@ -489,8 +490,14 @@ static void init_vmx(void)
> : MSR_IA32_VMX_ENTRY_CTLS);
> ctrl_cpu_rev[0].val = rdmsr(basic.ctrl ? MSR_IA32_VMX_TRUE_PROC
> : MSR_IA32_VMX_PROCBASED_CTLS);
> - ctrl_cpu_rev[1].val = rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2);
> - ept_vpid.val = rdmsr(MSR_IA32_VMX_EPT_VPID_CAP);
> + if ((ctrl_cpu_rev[0].clr & CPU_SECONDARY) != 0)
> + ctrl_cpu_rev[1].val = rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2);
> + else
> + ctrl_cpu_rev[1].val = 0;
> + if ((ctrl_cpu_rev[1].clr & (CPU_EPT | CPU_VPID)) != 0)
> + ept_vpid.val = rdmsr(MSR_IA32_VMX_EPT_VPID_CAP);
> + else
> + ept_vpid.val = 0;
>
> write_cr0((read_cr0() & fix_cr0_clr) | fix_cr0_set);
> write_cr4((read_cr4() & fix_cr4_clr) | fix_cr4_set | X86_CR4_VMXE);
> diff --git a/x86/vmx_tests.c b/x86/vmx_tests.c
> index 6d972c0..e891a9f 100644
> --- a/x86/vmx_tests.c
> +++ b/x86/vmx_tests.c
> @@ -1075,7 +1075,6 @@ static int ept_exit_handler()
> print_vmexit_info();
> return VMX_TEST_VMEXIT;
> }
> - vmcs_write(GUEST_RIP, guest_rip + insn_len);
> return VMX_TEST_RESUME;
> case VMX_EPT_VIOLATION:
> switch(get_stage()) {
> @@ -1100,7 +1099,6 @@ static int ept_exit_handler()
> print_vmexit_info();
> return VMX_TEST_VMEXIT;
> }
> - vmcs_write(GUEST_RIP, guest_rip + insn_len);
> return VMX_TEST_RESUME;
> default:
> printf("Unknown exit reason, %d\n", reason);
>
Looks good, thanks!
Paolo
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