Messages in this thread Patch in this message | | | From | Glauber de Oliveira Costa <> | Subject | [PATCH 2/3] kvmclock - the host part. | Date | Thu, 8 Nov 2007 20:39:22 -0200 |
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This is the host part of kvm clocksource implementation. As it does not include clockevents, it is a fairly simple implementation. We only have to register a per-vcpu area, and start writting to it periodically.
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> --- drivers/kvm/kvm_main.c | 1 + drivers/kvm/x86.c | 32 ++++++++++++++++++++++++++++++++ drivers/kvm/x86.h | 4 ++++ 3 files changed, 37 insertions(+), 0 deletions(-)
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index d095002..c2c79b8 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -1243,6 +1243,7 @@ static long kvm_dev_ioctl(struct file *filp, case KVM_CAP_MMU_SHADOW_CACHE_CONTROL: case KVM_CAP_USER_MEMORY: case KVM_CAP_SET_TSS_ADDR: + case KVM_CAP_CLOCKSOURCE: r = 1; break; default: diff --git a/drivers/kvm/x86.c b/drivers/kvm/x86.c index e905d46..ef31fed 100644 --- a/drivers/kvm/x86.c +++ b/drivers/kvm/x86.c @@ -19,6 +19,7 @@ #include "segment_descriptor.h" #include "irq.h" +#include <linux/clocksource.h> #include <linux/kvm.h> #include <linux/fs.h> #include <linux/vmalloc.h> @@ -1628,6 +1629,28 @@ int kvm_emulate_halt(struct kvm_vcpu *vcpu) } EXPORT_SYMBOL_GPL(kvm_emulate_halt); +static void kvm_write_guest_time(struct kvm_vcpu *vcpu) +{ + struct timespec ts; + int r; + + if (!vcpu->clock_gpa) + return; + + /* Updates version to the next odd number, indicating we're writing */ + vcpu->hv_clock.version++; + kvm_write_guest(vcpu->kvm, vcpu->clock_gpa, &vcpu->hv_clock, PAGE_SIZE); + + kvm_get_msr(vcpu, MSR_IA32_TIME_STAMP_COUNTER, + &vcpu->hv_clock.last_tsc); + + ktime_get_ts(&ts); + vcpu->hv_clock.now_ns = ts.tv_nsec + (NSEC_PER_SEC * (u64)ts.tv_sec); + vcpu->hv_clock.wc_sec = get_seconds(); + vcpu->hv_clock.version++; + kvm_write_guest(vcpu->kvm, vcpu->clock_gpa, &vcpu->hv_clock, PAGE_SIZE); +} + int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) { unsigned long nr, a0, a1, a2, a3, ret; @@ -1648,7 +1671,15 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) a3 &= 0xFFFFFFFF; } + ret = 0; switch (nr) { + case KVM_HCALL_REGISTER_CLOCK: + + vcpu->clock_gpa = a0 << PAGE_SHIFT; + vcpu->hv_clock.tsc_mult = clocksource_khz2mult(tsc_khz, 22); + + break; + default: ret = -KVM_ENOSYS; break; @@ -1924,6 +1955,7 @@ out: goto preempted; } + kvm_write_guest_time(vcpu); post_kvm_run_save(vcpu, kvm_run); return r; diff --git a/drivers/kvm/x86.h b/drivers/kvm/x86.h index 663b822..fd77b66 100644 --- a/drivers/kvm/x86.h +++ b/drivers/kvm/x86.h @@ -83,6 +83,10 @@ struct kvm_vcpu { /* emulate context */ struct x86_emulate_ctxt emulate_ctxt; + + struct kvm_hv_clock_s hv_clock; + gpa_t clock_gpa; /* guest frame number, physical addr */ + }; int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code); -- 1.5.0.6 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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