diff options
| author | Fred Griffoul <fgriffo@amazon.co.uk> | 2025-01-24 15:05:39 +0000 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2025-02-25 07:09:55 -0800 |
| commit | a2b00f85d7839d74a2f6fcbf547d4bf2e82c34e5 (patch) | |
| tree | ae03428a7cd98b7a327c22f76d831de7c6628bd1 /arch/x86/kvm/x86.h | |
| parent | 26e228ec169501110c451ee28b3d9c0cb8fb5923 (diff) | |
KVM: x86: Update Xen TSC leaves during CPUID emulation
The Xen emulation in KVM modifies certain CPUID leaves to expose
TSC information to the guest.
Previously, these CPUID leaves were updated whenever guest time changed,
but this conflicts with KVM_SET_CPUID/KVM_SET_CPUID2 ioctls which reject
changes to CPUID entries on running vCPUs.
Fix this by updating the TSC information directly in the CPUID emulation
handler instead of modifying the vCPU's CPUID entries.
Signed-off-by: Fred Griffoul <fgriffo@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Link: https://lore.kernel.org/r/20250124150539.69975-1-fgriffo@amazon.co.uk
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/x86.h')
| -rw-r--r-- | arch/x86/kvm/x86.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index 91e50a513100..658c28632deb 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -362,6 +362,7 @@ void kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip); u64 get_kvmclock_ns(struct kvm *kvm); uint64_t kvm_get_wall_clock_epoch(struct kvm *kvm); bool kvm_get_monotonic_and_clockread(s64 *kernel_ns, u64 *tsc_timestamp); +int kvm_guest_time_update(struct kvm_vcpu *v); int kvm_read_guest_virt(struct kvm_vcpu *vcpu, gva_t addr, void *val, unsigned int bytes, |