On Fri, Aug 07, 2020 at 10:38:23AM +0200, Juergen Gross wrote:
> -# else
> - const unsigned char cpu_iret[1];
> -# endif
> };
>
> static const struct patch_xxl patch_data_xxl = {
> @@ -42,7 +38,6 @@ static const struct patch_xxl patch_data_xxl = {
> .irq_save_fl = { 0x9c, 0x58 }, // pushf; pop %[re]ax
> .mmu_read_cr2 = { 0x0f, 0x20, 0xd0 }, // mov %cr2, %[re]ax
> .mmu_read_cr3 = { 0x0f, 0x20, 0xd8 }, // mov %cr3, %[re]ax
> -# ifdef CONFIG_X86_64
> .mmu_write_cr3 = { 0x0f, 0x22, 0xdf }, // mov %rdi, %cr3
> .irq_restore_fl = { 0x57, 0x9d }, // push %rdi; popfq
> .cpu_wbinvd = { 0x0f, 0x09 }, // wbinvd
> @@ -50,19 +45,11 @@ static const struct patch_xxl patch_data_xxl = {
> 0x48, 0x0f, 0x07 }, // swapgs; sysretq
> .cpu_swapgs = { 0x0f, 0x01, 0xf8 }, // swapgs
> .mov64 = { 0x48, 0x89, 0xf8 }, // mov %rdi, %rax
> -# else
> - .mmu_write_cr3 = { 0x0f, 0x22, 0xd8 }, // mov %eax, %cr3
> - .irq_restore_fl = { 0x50, 0x9d }, // push %eax; popf
> - .cpu_iret = { 0xcf }, // iret
> -# endif
I was looking at x86_64 paravirt the other day and found we actually
have pv_ops.cpu.iret users there..
So we want to change the above to also patch iret on x86_64 or do we
need to fix x86_64 to not have pv-iret?
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