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KVM: selftests: x86: Cache host CPU vendor (AMD vs. Intel)

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Cache the host CPU vendor for userspace and share it with guest code.

All the current callers of this_cpu* actually care about host cpu so
they are updated to check host_cpu_is*.

Suggested-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: David Matlack <dmatlack@google.com>
Signed-off-by: Vishal Annapurve <vannapurve@google.com>
Link: https://lore.kernel.org/r/20230111004445.416840-3-vannapurve@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Vishal Annapurve
2023-01-11 00:44:44 +00:00
committed by Sean Christopherson
parent e99b0d4cc2
commit e6df2ae3f5
6 changed files with 21 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
tools/testing/selftests/kvm/lib/x86_64/processor.c
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@@ -19,6 +19,8 @@
#define MAX_NR_CPUID_ENTRIES 100
vm_vaddr_t exception_handlers;
bool host_cpu_is_amd;
bool host_cpu_is_intel;
static void regs_dump(FILE *stream, struct kvm_regs *regs, uint8_t indent)
{
@@ -113,7 +115,7 @@ static void sregs_dump(FILE *stream, struct kvm_sregs *sregs, uint8_t indent)
bool kvm_is_tdp_enabled(void)
{
if (this_cpu_is_intel())
if (host_cpu_is_intel)
return get_kvm_intel_param_bool("ept");
else
return get_kvm_amd_param_bool("npt");
@@ -555,6 +557,8 @@ static void vcpu_setup(struct kvm_vm *vm, struct kvm_vcpu *vcpu)
void kvm_arch_vm_post_create(struct kvm_vm *vm)
{
vm_create_irqchip(vm);
sync_global_to_guest(vm, host_cpu_is_intel);
sync_global_to_guest(vm, host_cpu_is_amd);
}
struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id,
@@ -1214,7 +1218,7 @@ unsigned long vm_compute_max_gfn(struct kvm_vm *vm)
max_gfn = (1ULL << (vm->pa_bits - vm->page_shift)) - 1;
/* Avoid reserved HyperTransport region on AMD processors. */
if (!this_cpu_is_amd())
if (!host_cpu_is_amd)
return max_gfn;
/* On parts with <40 physical address bits, the area is fully hidden */
@@ -1254,3 +1258,9 @@ bool vm_is_unrestricted_guest(struct kvm_vm *vm)
return get_kvm_intel_param_bool("unrestricted_guest");
}
void kvm_selftest_arch_init(void)
{
host_cpu_is_intel = this_cpu_is_intel();
host_cpu_is_amd = this_cpu_is_amd();
}