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Merge tag 'kvm-x86-misc-6.17' of https://github.com/kvm-x86/linux into HEAD

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KVM x86 misc changes for 6.17

 - Prevert the host's DEBUGCTL.FREEZE_IN_SMM (Intel only) when running the
   guest.  Failure to honor FREEZE_IN_SMM can bleed host state into the guest.

 - Explicitly check vmcs12.GUEST_DEBUGCTL on nested VM-Enter (Intel only) to
   prevent L1 from running L2 with features that KVM doesn't support, e.g. BTF.

 - Intercept SPEC_CTRL on AMD if the MSR shouldn't exist according to the
   vCPU's CPUID model.

 - Rework the MSR interception code so that the SVM and VMX APIs are more or
   less identical.

 - Recalculate all MSR intercepts from the "source" on MSR filter changes, and
   drop the dedicated "shadow" bitmaps (and their awful "max" size defines).

 - WARN and reject loading kvm-amd.ko instead of panicking the kernel if the
   nested SVM MSRPM offsets tracker can't handle an MSR.

 - Advertise support for LKGS (Load Kernel GS base), a new instruction that's
   loosely related to FRED, but is supported and enumerated independently.

 - Fix a user-triggerable WARN that syzkaller found by stuffing INIT_RECEIVED,
   a.k.a. WFS, and then putting the vCPU into VMX Root Mode (post-VMXON).  Use
   the same approach KVM uses for dealing with "impossible" emulation when
   running a !URG guest, and simply wait until KVM_RUN to detect that the vCPU
   has architecturally impossible state.

 - Add KVM_X86_DISABLE_EXITS_APERFMPERF to allow disabling interception of
   APERF/MPERF reads, so that a "properly" configured VM can "virtualize"
   APERF/MPERF (with many caveats).

 - Reject KVM_SET_TSC_KHZ if vCPUs have been created, as changing the "default"
   frequency is unsupported for VMs with a "secure" TSC, and there's no known
   use case for changing the default frequency for other VM types.
This commit is contained in:
Paolo Bonzini
2025-07-28 11:13:57 -04:00
parent 9de13951d5 dcbe5a466c
commit 1a14928e2e
30 changed files with 931 additions and 751 deletions
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31
tools/testing/selftests/kvm/include/kvm_util.h
View File

@@ -21,6 +21,8 @@
#include <sys/eventfd.h>
#include <sys/ioctl.h>
#include <pthread.h>
#include "kvm_util_arch.h"
#include "kvm_util_types.h"
#include "sparsebit.h"
@@ -1053,7 +1055,34 @@ struct kvm_vcpu *vm_recreate_with_one_vcpu(struct kvm_vm *vm);
void kvm_set_files_rlimit(uint32_t nr_vcpus);
void kvm_pin_this_task_to_pcpu(uint32_t pcpu);
int __pin_task_to_cpu(pthread_t task, int cpu);
static inline void pin_task_to_cpu(pthread_t task, int cpu)
{
int r;
r = __pin_task_to_cpu(task, cpu);
TEST_ASSERT(!r, "Failed to set thread affinity to pCPU '%u'", cpu);
}
static inline int pin_task_to_any_cpu(pthread_t task)
{
int cpu = sched_getcpu();
pin_task_to_cpu(task, cpu);
return cpu;
}
static inline void pin_self_to_cpu(int cpu)
{
pin_task_to_cpu(pthread_self(), cpu);
}
static inline int pin_self_to_any_cpu(void)
{
return pin_task_to_any_cpu(pthread_self());
}
void kvm_print_vcpu_pinning_help(void);
void kvm_parse_vcpu_pinning(const char *pcpus_string, uint32_t vcpu_to_pcpu[],
int nr_vcpus);