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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [XEN PATCH] x86/hvm: Use constants for x86 modes
On Thu Oct 31, 2024 at 1:27 PM GMT, Teddy Astie wrote:
> In many places of x86 HVM code, constants integer are used to indicate in
> what mode is
> running the CPU (real, v86, 16-bits, 32-bits, 64-bits). However, these
> constants are
> are written directly as integer which hides the actual meaning of these modes.
Ew. Good riddance. Just a couple of nits...
>
> This patch introduces X86_MODE_* macros and replace those occurences with it.
>
> Signed-off-by Teddy Astie <teddy.astie@xxxxxxxxxx>
> ---
> I am not sure of other places that uses these integer constants.
> ---
> xen/arch/x86/hvm/emulate.c | 16 ++++++++--------
> xen/arch/x86/hvm/hypercall.c | 13 +++++++------
> xen/arch/x86/hvm/viridian/viridian.c | 9 +++++----
> xen/arch/x86/hvm/vmx/vmx.c | 9 +++++----
> xen/arch/x86/hvm/vmx/vvmx.c | 5 +++--
> xen/arch/x86/include/asm/hvm/hvm.h | 6 ++++++
> 6 files changed, 34 insertions(+), 24 deletions(-)
>
> diff --git a/xen/arch/x86/hvm/emulate.c b/xen/arch/x86/hvm/emulate.c
> index ecf83795fa..60a7c15bdc 100644
> --- a/xen/arch/x86/hvm/emulate.c
> +++ b/xen/arch/x86/hvm/emulate.c
> @@ -2433,14 +2433,14 @@ static void cf_check hvmemul_put_fpu(
>
> switch ( mode )
> {
> - case 8:
> + case X86_MODE_64BIT:
> fpu_ctxt->fip.addr = aux->ip;
> if ( dval )
> fpu_ctxt->fdp.addr = aux->dp;
> fpu_ctxt->x[FPU_WORD_SIZE_OFFSET] = 8;
> break;
>
> - case 4: case 2:
> + case X86_MODE_32BIT: case X86_MODE_16BIT:
^
|
nit: Good time to add newline here...
> fpu_ctxt->fip.offs = aux->ip;
> fpu_ctxt->fip.sel = aux->cs;
> if ( dval )
> @@ -2451,7 +2451,7 @@ static void cf_check hvmemul_put_fpu(
> fpu_ctxt->x[FPU_WORD_SIZE_OFFSET] = mode;
> break;
>
> - case 0: case 1:
> + case X86_MODE_REAL: case X86_MODE_V86:
^
|
+-------------------+
|
... and here.
> fpu_ctxt->fip.addr = aux->ip | (aux->cs << 4);
> if ( dval )
> fpu_ctxt->fdp.addr = aux->dp | (aux->ds << 4);
> @@ -2952,11 +2952,11 @@ static const char *guest_x86_mode_to_str(int mode)
> {
> switch ( mode )
> {
> - case 0: return "Real";
> - case 1: return "v86";
> - case 2: return "16bit";
> - case 4: return "32bit";
> - case 8: return "64bit";
> + case X86_MODE_REAL: return "Real";
> + case X86_MODE_V86: return "v86";
> + case X86_MODE_16BIT: return "16bit";
> + case X86_MODE_32BIT: return "32bit";
> + case X86_MODE_64BIT: return "64bit";
> default: return "Unknown";
> }
> }
> diff --git a/xen/arch/x86/hvm/hypercall.c b/xen/arch/x86/hvm/hypercall.c
> index 81883c8d4f..e0e9bcd22d 100644
> --- a/xen/arch/x86/hvm/hypercall.c
> +++ b/xen/arch/x86/hvm/hypercall.c
> @@ -11,6 +11,7 @@
> #include <xen/ioreq.h>
> #include <xen/nospec.h>
>
> +#include <asm/hvm/hvm.h>
> #include <asm/hvm/emulate.h>
> #include <asm/hvm/support.h>
> #include <asm/hvm/viridian.h>
> @@ -112,23 +113,23 @@ int hvm_hypercall(struct cpu_user_regs *regs)
>
> switch ( mode )
> {
> - case 8:
> + case X86_MODE_64BIT:
> eax = regs->rax;
> fallthrough;
> - case 4:
> - case 2:
> + case X86_MODE_32BIT:
> + case X86_MODE_16BIT:
> if ( currd->arch.monitor.guest_request_userspace_enabled &&
> eax == __HYPERVISOR_hvm_op &&
> - (mode == 8 ? regs->rdi : regs->ebx) ==
> HVMOP_guest_request_vm_event )
> + (mode == X86_MODE_64BIT ? regs->rdi : regs->ebx) ==
> HVMOP_guest_request_vm_event )
> break;
>
> if ( likely(!hvm_get_cpl(curr)) )
> break;
> fallthrough;
> - default:
> + case X86_MODE_V86:
> regs->rax = -EPERM;
> return HVM_HCALL_completed;
> - case 0:
> + case X86_MODE_REAL:
> break;
> }
>
> diff --git a/xen/arch/x86/hvm/viridian/viridian.c
> b/xen/arch/x86/hvm/viridian/viridian.c
> index 21480d9ee7..0e3b824bf0 100644
> --- a/xen/arch/x86/hvm/viridian/viridian.c
> +++ b/xen/arch/x86/hvm/viridian/viridian.c
> @@ -16,6 +16,7 @@
> #include <asm/paging.h>
> #include <asm/p2m.h>
> #include <asm/apic.h>
> +#include <asm/hvm/hvm.h>
> #include <public/sched.h>
> #include <public/hvm/hvm_op.h>
>
> @@ -933,13 +934,13 @@ int viridian_hypercall(struct cpu_user_regs *regs)
>
> switch ( mode )
> {
> - case 8:
> + case X86_MODE_64BIT:
> input.raw = regs->rcx;
> input_params_gpa = regs->rdx;
> output_params_gpa = regs->r8;
> break;
>
> - case 4:
> + case X86_MODE_32BIT:
> input.raw = (regs->rdx << 32) | regs->eax;
> input_params_gpa = (regs->rbx << 32) | regs->ecx;
> output_params_gpa = (regs->rdi << 32) | regs->esi;
> @@ -1038,11 +1039,11 @@ int viridian_hypercall(struct cpu_user_regs *regs)
>
> switch ( mode )
> {
> - case 8:
> + case X86_MODE_64BIT:
> regs->rax = output.raw;
> break;
>
> - case 4:
> + case X86_MODE_32BIT:
> regs->rdx = output.raw >> 32;
> regs->rax = (uint32_t)output.raw;
> break;
> diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
> index 12f8a66458..b77f135a2d 100644
> --- a/xen/arch/x86/hvm/vmx/vmx.c
> +++ b/xen/arch/x86/hvm/vmx/vmx.c
> @@ -886,14 +886,15 @@ int cf_check vmx_guest_x86_mode(struct vcpu *v)
> unsigned long cs_ar_bytes;
>
> if ( unlikely(!(v->arch.hvm.guest_cr[0] & X86_CR0_PE)) )
> - return 0;
> + return X86_MODE_REAL;
> if ( unlikely(guest_cpu_user_regs()->eflags & X86_EFLAGS_VM) )
> - return 1;
> + return X86_MODE_V86;
> __vmread(GUEST_CS_AR_BYTES, &cs_ar_bytes);
> if ( hvm_long_mode_active(v) &&
> likely(cs_ar_bytes & X86_SEG_AR_CS_LM_ACTIVE) )
> - return 8;
> - return (likely(cs_ar_bytes & X86_SEG_AR_DEF_OP_SIZE) ? 4 : 2);
> + return X86_MODE_64BIT;
> + return (likely(cs_ar_bytes & X86_SEG_AR_DEF_OP_SIZE)
> + ? X86_MODE_32BIT : X86_MODE_16BIT);
> }
>
> static void vmx_save_dr(struct vcpu *v)
> diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
> index c05e0e9326..5032fc3a45 100644
> --- a/xen/arch/x86/hvm/vmx/vvmx.c
> +++ b/xen/arch/x86/hvm/vmx/vvmx.c
> @@ -411,7 +411,7 @@ static int decode_vmx_inst(struct cpu_user_regs *regs,
> }
> else
> {
> - bool mode_64bit = (vmx_guest_x86_mode(v) == 8);
> + bool mode_64bit = (vmx_guest_x86_mode(v) == X86_MODE_64BIT);
>
> decode->type = VMX_INST_MEMREG_TYPE_MEMORY;
>
> @@ -2073,7 +2073,8 @@ int nvmx_handle_vmx_insn(struct cpu_user_regs *regs,
> unsigned int exit_reason)
>
> if ( !(curr->arch.hvm.guest_cr[4] & X86_CR4_VMXE) ||
> !nestedhvm_enabled(curr->domain) ||
> - (vmx_guest_x86_mode(curr) < (hvm_long_mode_active(curr) ? 8 : 2)) ||
> + (vmx_guest_x86_mode(curr) < (hvm_long_mode_active(curr) ?
> X86_MODE_64BIT
> + :
> X86_MODE_16BIT)) ||
> (exit_reason != EXIT_REASON_VMXON && !nvmx_vcpu_in_vmx(curr)) )
> {
> hvm_inject_hw_exception(X86_EXC_UD, X86_EVENT_NO_EC);
> diff --git a/xen/arch/x86/include/asm/hvm/hvm.h
> b/xen/arch/x86/include/asm/hvm/hvm.h
> index dd7d4872b5..29ae23617e 100644
> --- a/xen/arch/x86/include/asm/hvm/hvm.h
> +++ b/xen/arch/x86/include/asm/hvm/hvm.h
> @@ -26,6 +26,12 @@ extern bool opt_hvm_fep;
> #define opt_hvm_fep 0
> #endif
>
> +#define X86_MODE_REAL 0
> +#define X86_MODE_V86 1
> +#define X86_MODE_16BIT 2
> +#define X86_MODE_32BIT 4
> +#define X86_MODE_64BIT 8
> +
> /* Interrupt acknowledgement sources. */
> enum hvm_intsrc {
> hvm_intsrc_none,
> --
> 2.45.2
>
>
>
> Teddy Astie | Vates XCP-ng Intern
>
> XCP-ng & Xen Orchestra - Vates solutions
>
> web: https://vates.tech
Cheers,
Alejandro
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