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KVM: selftests: Add a fully functional "struct xstate" for x86

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Add a working xstate data structure for the usage of AMX and potential
future usage on other xstate components. AMX selftest requires checking
both the xstate_bv and xcomp_bv. Existing code relies on pointer
arithmetics to fetch xstate_bv and does not support xcomp_bv.

So, add a working xstate data structure into processor.h for x86.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Mingwei Zhang <mizhang@google.com>
Link: https://lore.kernel.org/r/20230221163655.920289-3-mizhang@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Mingwei Zhang
2023-02-21 16:36:44 +00:00
committed by Sean Christopherson
parent 735b0e0f2d
commit 5de4a3765b
2 changed files with 23 additions and 25 deletions
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12
tools/testing/selftests/kvm/include/x86_64/processor.h
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@@ -48,6 +48,18 @@ extern bool host_cpu_is_amd;
#define X86_CR4_SMAP (1ul << 21)
#define X86_CR4_PKE (1ul << 22)
struct xstate_header {
u64 xstate_bv;
u64 xcomp_bv;
u64 reserved[6];
} __attribute__((packed));
struct xstate {
u8 i387[512];
struct xstate_header header;
u8 extended_state_area[0];
} __attribute__ ((packed, aligned (64)));
/* Note, these are ordered alphabetically to match kvm_cpuid_entry2. Eww. */
enum cpuid_output_regs {
KVM_CPUID_EAX,