git/linux-cryptodev-2.6
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git synced 2026-04-18 03:23:53 -04:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

15
tools/testing/selftests/kvm/lib/kvm_util.c
View File

@@ -605,15 +605,14 @@ struct kvm_vcpu *vm_recreate_with_one_vcpu(struct kvm_vm *vm)
return vm_vcpu_recreate(vm, 0);
}
void kvm_pin_this_task_to_pcpu(uint32_t pcpu)
int __pin_task_to_cpu(pthread_t task, int cpu)
{
cpu_set_t mask;
int r;
cpu_set_t cpuset;
CPU_ZERO(&mask);
CPU_SET(pcpu, &mask);
r = sched_setaffinity(0, sizeof(mask), &mask);
TEST_ASSERT(!r, "sched_setaffinity() failed for pCPU '%u'.", pcpu);
CPU_ZERO(&cpuset);
CPU_SET(cpu, &cpuset);
return pthread_setaffinity_np(task, sizeof(cpuset), &cpuset);
}
static uint32_t parse_pcpu(const char *cpu_str, const cpu_set_t *allowed_mask)
@@ -667,7 +666,7 @@ void kvm_parse_vcpu_pinning(const char *pcpus_string, uint32_t vcpu_to_pcpu[],
/* 2. Check if the main worker needs to be pinned. */
if (cpu) {
kvm_pin_this_task_to_pcpu(parse_pcpu(cpu, &allowed_mask));
pin_self_to_cpu(parse_pcpu(cpu, &allowed_mask));
cpu = strtok(NULL, delim);
}