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KVM: selftests: Check that the palette table exists before using it

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Check that the palette table exists before using it. The maximum number of
AMX palette tables is enumerated by CPUID.1DH:EAX. Assert that the palette
used in amx_test, CPUID.1DH.1H, does not exceed that maximum.

Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Signed-off-by: Mingwei Zhang <mizhang@google.com>
Link: https://lore.kernel.org/r/20230221163655.920289-13-mizhang@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Aaron Lewis 2023-02-21 16:36:54 +00:00 committed by Sean Christopherson
parent d01d4a4f7b
commit d32fb07142
2 changed files with 6 additions and 0 deletions
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1
tools/testing/selftests/kvm/include/x86_64/processor.h
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@ -227,6 +227,7 @@ struct kvm_x86_cpu_property {
#define X86_PROPERTY_XSTATE_MAX_SIZE KVM_X86_CPU_PROPERTY(0xd, 0, ECX, 0, 31)
#define X86_PROPERTY_XSTATE_TILE_SIZE KVM_X86_CPU_PROPERTY(0xd, 18, EAX, 0, 31)
#define X86_PROPERTY_XSTATE_TILE_OFFSET KVM_X86_CPU_PROPERTY(0xd, 18, EBX, 0, 31)
#define X86_PROPERTY_AMX_MAX_PALETTE_TABLES KVM_X86_CPU_PROPERTY(0x1d, 0, EAX, 0, 31)
#define X86_PROPERTY_AMX_TOTAL_TILE_BYTES KVM_X86_CPU_PROPERTY(0x1d, 1, EAX, 0, 15)
#define X86_PROPERTY_AMX_BYTES_PER_TILE KVM_X86_CPU_PROPERTY(0x1d, 1, EAX, 16, 31)
#define X86_PROPERTY_AMX_BYTES_PER_ROW KVM_X86_CPU_PROPERTY(0x1d, 1, EBX, 0, 15)

5
tools/testing/selftests/kvm/x86_64/amx_test.c
View File

@ -30,6 +30,7 @@
#define XSAVE_SIZE ((NUM_TILES * TILE_SIZE) + PAGE_SIZE)
/* Tile configuration associated: */
#define PALETTE_TABLE_INDEX 1
#define MAX_TILES 16
#define RESERVED_BYTES 14
@ -120,6 +121,10 @@ static void check_xtile_info(void)
GUEST_ASSERT(xtile.xsave_size == 8192);
GUEST_ASSERT(sizeof(struct tile_data) >= xtile.xsave_size);
GUEST_ASSERT(this_cpu_has_p(X86_PROPERTY_AMX_MAX_PALETTE_TABLES));
GUEST_ASSERT(this_cpu_property(X86_PROPERTY_AMX_MAX_PALETTE_TABLES) >=
PALETTE_TABLE_INDEX);
GUEST_ASSERT(this_cpu_has_p(X86_PROPERTY_AMX_NR_TILE_REGS));
xtile.max_names = this_cpu_property(X86_PROPERTY_AMX_NR_TILE_REGS);
GUEST_ASSERT(xtile.max_names == 8);