From ea26e4ec08d4727e3a9e48a6b74695861effcbd9 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Tue, 1 Nov 2016 00:39:48 +0100 Subject: KVM: x86: drop TSC offsetting kvm_x86_ops to fix KVM_GET/SET_CLOCK MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Since commit a545ab6a0085 ("kvm: x86: add tsc_offset field to struct kvm_vcpu_arch", 2016-09-07) the offset between host and L1 TSC is cached and need not be fished out of the VMCS or VMCB. This means that we can implement adjust_tsc_offset_guest and read_l1_tsc entirely in generic code. The simplification is particularly significant for VMX code, where vmx->nested.vmcs01_tsc_offset was duplicating what is now in vcpu->arch.tsc_offset. Therefore the vmcs01_tsc_offset can be dropped completely. More importantly, this fixes KVM_GET_CLOCK/KVM_SET_CLOCK which, after commit 108b249c453d ("KVM: x86: introduce get_kvmclock_ns", 2016-09-01) called read_l1_tsc while the VMCS was not loaded. It thus returned bogus values on Intel CPUs. Fixes: 108b249c453dd7132599ab6dc7e435a7036c193f Reported-by: Roman Kagan Reviewed-by: Radim Krčmář Signed-off-by: Paolo Bonzini --- arch/x86/include/asm/kvm_host.h | 3 --- 1 file changed, 3 deletions(-) (limited to 'arch/x86/include/asm') diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 4b20f7304b9c..bdde80731f49 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -948,7 +948,6 @@ struct kvm_x86_ops { int (*get_lpage_level)(void); bool (*rdtscp_supported)(void); bool (*invpcid_supported)(void); - void (*adjust_tsc_offset_guest)(struct kvm_vcpu *vcpu, s64 adjustment); void (*set_tdp_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3); @@ -958,8 +957,6 @@ struct kvm_x86_ops { void (*write_tsc_offset)(struct kvm_vcpu *vcpu, u64 offset); - u64 (*read_l1_tsc)(struct kvm_vcpu *vcpu, u64 host_tsc); - void (*get_exit_info)(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2); int (*check_intercept)(struct kvm_vcpu *vcpu, -- cgit v1.2.3 From e8a6123e9ead1b0d40349809e51de9341312fe08 Mon Sep 17 00:00:00 2001 From: Lukas Wunner Date: Sun, 23 Oct 2016 13:55:34 +0200 Subject: x86/platform/intel-mid: Retrofit pci_platform_pm_ops ->get_state hook Commit cc7cc02bada8 ("PCI: Query platform firmware for device power state") augmented struct pci_platform_pm_ops with a ->get_state hook and implemented it for acpi_pci_platform_pm, the only pci_platform_pm_ops existing till v4.7. However v4.8 introduced another pci_platform_pm_ops for Intel Mobile Internet Devices with commit 5823d0893ec2 ("x86/platform/intel-mid: Add Power Management Unit driver"). It is missing the ->get_state hook, which is fatal since pci_set_platform_pm() enforces its presence. Andy Shevchenko reports that without the present commit, such a device "crashes without even a character printed out on serial console and reboots (since watchdog)". Retrofit mid_pci_platform_pm with the missing callback to fix the breakage. Acked-and-tested-by: Andy Shevchenko Fixes: cc7cc02bada8 ("PCI: Query platform firmware for device power state") Signed-off-by: Lukas Wunner Acked-by: Bjorn Helgaas Cc: linux-pci@vger.kernel.org Cc: Andy Shevchenko Link: http://lkml.kernel.org/r/7c1567d4c49303a4aada94ba16275cbf56b8976b.1477221514.git.lukas@wunner.de Signed-off-by: Thomas Gleixner --- arch/x86/include/asm/intel-mid.h | 1 + arch/x86/platform/intel-mid/pwr.c | 19 +++++++++++++++++++ drivers/pci/pci-mid.c | 6 ++++++ 3 files changed, 26 insertions(+) (limited to 'arch/x86/include/asm') diff --git a/arch/x86/include/asm/intel-mid.h b/arch/x86/include/asm/intel-mid.h index 5b6753d1f7f4..49da9f497b90 100644 --- a/arch/x86/include/asm/intel-mid.h +++ b/arch/x86/include/asm/intel-mid.h @@ -17,6 +17,7 @@ extern int intel_mid_pci_init(void); extern int intel_mid_pci_set_power_state(struct pci_dev *pdev, pci_power_t state); +extern pci_power_t intel_mid_pci_get_power_state(struct pci_dev *pdev); extern void intel_mid_pwr_power_off(void); diff --git a/arch/x86/platform/intel-mid/pwr.c b/arch/x86/platform/intel-mid/pwr.c index 5d3b45ad1c03..67375dda451c 100644 --- a/arch/x86/platform/intel-mid/pwr.c +++ b/arch/x86/platform/intel-mid/pwr.c @@ -272,6 +272,25 @@ int intel_mid_pci_set_power_state(struct pci_dev *pdev, pci_power_t state) } EXPORT_SYMBOL_GPL(intel_mid_pci_set_power_state); +pci_power_t intel_mid_pci_get_power_state(struct pci_dev *pdev) +{ + struct mid_pwr *pwr = midpwr; + int id, reg, bit; + u32 power; + + if (!pwr || !pwr->available) + return PCI_UNKNOWN; + + id = intel_mid_pwr_get_lss_id(pdev); + if (id < 0) + return PCI_UNKNOWN; + + reg = (id * LSS_PWS_BITS) / 32; + bit = (id * LSS_PWS_BITS) % 32; + power = mid_pwr_get_state(pwr, reg); + return (__force pci_power_t)((power >> bit) & 3); +} + void intel_mid_pwr_power_off(void) { struct mid_pwr *pwr = midpwr; diff --git a/drivers/pci/pci-mid.c b/drivers/pci/pci-mid.c index 55f453de562e..c7f3408e3148 100644 --- a/drivers/pci/pci-mid.c +++ b/drivers/pci/pci-mid.c @@ -29,6 +29,11 @@ static int mid_pci_set_power_state(struct pci_dev *pdev, pci_power_t state) return intel_mid_pci_set_power_state(pdev, state); } +static pci_power_t mid_pci_get_power_state(struct pci_dev *pdev) +{ + return intel_mid_pci_get_power_state(pdev); +} + static pci_power_t mid_pci_choose_state(struct pci_dev *pdev) { return PCI_D3hot; @@ -52,6 +57,7 @@ static bool mid_pci_need_resume(struct pci_dev *dev) static struct pci_platform_pm_ops mid_pci_platform_pm = { .is_manageable = mid_pci_power_manageable, .set_state = mid_pci_set_power_state, + .get_state = mid_pci_get_power_state, .choose_state = mid_pci_choose_state, .sleep_wake = mid_pci_sleep_wake, .run_wake = mid_pci_run_wake, -- cgit v1.2.3