From: Nicholas Piggin <npiggin@gmail.com>
To: kvm-ppc@vger.kernel.org
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>,
linuxppc-dev@lists.ozlabs.org,
Nicholas Piggin <npiggin@gmail.com>
Subject: [PATCH v5 28/48] KMV: PPC: Book3S HV: Use set_dec to set decrementer to host
Date: Fri, 2 Apr 2021 01:03:05 +1000 [thread overview]
Message-ID: <20210401150325.442125-29-npiggin@gmail.com> (raw)
In-Reply-To: <20210401150325.442125-1-npiggin@gmail.com>
The host Linux timer code arms the decrementer with the value
'decrementers_next_tb - current_tb' using set_dec(), which stores
val - 1 on Book3S-64, which is not quite the same as what KVM does
to re-arm the host decrementer when exiting the guest.
This shouldn't be a significant change, but it makes the logic match
and avoids this small extra change being brought into the next patch.
Suggested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/kvm/book3s_hv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 6cfac8f553f6..8c8df88eec8c 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -3902,7 +3902,7 @@ static int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit,
vc->in_guest = 0;
next_timer = timer_get_next_tb();
- mtspr(SPRN_DEC, next_timer - tb);
+ set_dec(next_timer - tb);
/* We may have raced with new irq work */
if (test_irq_work_pending())
set_dec(1);
--
2.23.0
next prev parent reply other threads:[~2021-04-01 15:16 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-01 15:02 [PATCH v5 00/48] KVM: PPC: Book3S: C-ify the P9 entry/exit code Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 01/48] KVM: PPC: Book3S HV: Nested move LPCR sanitising to sanitise_hv_regs Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 02/48] KVM: PPC: Book3S HV: Add a function to filter guest LPCR bits Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 03/48] KVM: PPC: Book3S HV: Disallow LPCR[AIL] to be set to 1 or 2 Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 04/48] KVM: PPC: Book3S HV: Prevent radix guests setting LPCR[TC] Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 05/48] KVM: PPC: Book3S HV: Remove redundant mtspr PSPB Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 06/48] KVM: PPC: Book3S HV: remove unused kvmppc_h_protect argument Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 07/48] KVM: PPC: Book3S HV: Fix CONFIG_SPAPR_TCE_IOMMU=n default hcalls Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 08/48] powerpc/64s: Remove KVM handler support from CBE_RAS interrupts Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 09/48] powerpc/64s: remove KVM SKIP test from instruction breakpoint handler Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 10/48] KVM: PPC: Book3S HV: Ensure MSR[ME] is always set in guest MSR Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 11/48] KVM: PPC: Book3S HV: Ensure MSR[HV] is always clear " Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 12/48] KVM: PPC: Book3S 64: move KVM interrupt entry to a common entry point Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 13/48] KVM: PPC: Book3S 64: Move GUEST_MODE_SKIP test into KVM Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 14/48] KVM: PPC: Book3S 64: add hcall interrupt handler Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 15/48] KVM: PPC: Book3S 64: Move hcall early register setup to KVM Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 16/48] KVM: PPC: Book3S 64: Move interrupt " Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 17/48] KVM: PPC: Book3S 64: move bad_host_intr check to HV handler Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 18/48] KVM: PPC: Book3S 64: Minimise hcall handler calling convention differences Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 19/48] KVM: PPC: Book3S HV P9: Move radix MMU switching instructions together Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 20/48] KVM: PPC: Book3S HV P9: implement kvmppc_xive_pull_vcpu in C Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 21/48] KVM: PPC: Book3S HV P9: Move xive vcpu context management into kvmhv_p9_guest_entry Nicholas Piggin
2021-04-01 15:02 ` [PATCH v5 22/48] KVM: PPC: Book3S HV P9: Stop handling hcalls in real-mode in the P9 path Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 23/48] KVM: PPC: Book3S HV P9: Move setting HDEC after switching to guest LPCR Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 24/48] KVM: PPC: Book3S HV P9: Use large decrementer for HDEC Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 25/48] KVM: PPC: Book3S HV P9: Use host timer accounting to avoid decrementer read Nicholas Piggin
2021-04-02 4:19 ` kernel test robot
2021-04-01 15:03 ` [PATCH v5 26/48] KVM: PPC: Book3S HV P9: Reduce mftb per guest entry/exit Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 27/48] KVM: PPC: Book3S HV P9: Reduce irq_work vs guest decrementer races Nicholas Piggin
2021-04-01 15:03 ` Nicholas Piggin [this message]
2021-04-01 15:03 ` [PATCH v5 29/48] powerpc: add set_dec_or_work API for safely updating decrementer Nicholas Piggin
2021-04-02 11:04 ` Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 30/48] KVM: PPC: Book3S HV P9: Implement the rest of the P9 path in C Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 31/48] KVM: PPC: Book3S HV P9: inline kvmhv_load_hv_regs_and_go into __kvmhv_vcpu_entry_p9 Nicholas Piggin
2021-04-02 20:58 ` kernel test robot
2021-04-01 15:03 ` [PATCH v5 32/48] KVM: PPC: Book3S HV P9: Read machine check registers while MSR[RI] is 0 Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 33/48] KVM: PPC: Book3S HV P9: Improve exit timing accounting coverage Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 34/48] KVM: PPC: Book3S HV P9: Move SPR loading after expiry time check Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 35/48] KVM: PPC: Book3S HV P9: Add helpers for OS SPR handling Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 36/48] KVM: PPC: Book3S HV P9: Switch to guest MMU context as late as possible Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 37/48] KVM: PPC: Book3S HV: Implement radix prefetch workaround by disabling MMU Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 38/48] KVM: PPC: Book3S HV: Remove support for dependent threads mode on P9 Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 39/48] KVM: PPC: Book3S HV: Remove radix guest support from P7/8 path Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 40/48] KVM: PPC: Book3S HV: Remove virt mode checks from real mode handlers Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 41/48] KVM: PPC: Book3S HV: Remove unused nested HV tests in XICS emulation Nicholas Piggin
2021-04-02 15:28 ` kernel test robot
2021-04-02 16:32 ` Cédric Le Goater
2021-04-04 0:48 ` Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 42/48] KVM: PPC: Book3S HV: Radix guests should not have userspace hcalls reflected to them Nicholas Piggin
2021-04-02 0:07 ` Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 43/48] KVM: PPC: Book3S HV P9: Allow all P9 processors to enable nested HV Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 44/48] KVM: PPC: Book3S HV: small pseries_do_hcall cleanup Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 45/48] KVM: PPC: Book3S HV: add virtual mode handlers for HPT hcalls and page faults Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 46/48] KVM: PPC: Book3S HV P9: implement hash guest support Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 47/48] KVM: PPC: Book3S HV P9: implement hash host / " Nicholas Piggin
2021-04-01 15:03 ` [PATCH v5 48/48] KVM: PPC: Book3S HV: remove ISA v3.0 and v3.1 support from P7/8 path Nicholas Piggin
2021-04-02 0:11 ` Nicholas Piggin
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