Historically, The mtime/mtimecmp has been part of the CPU because
they are per hart entities. However, they actually belong to aclint
which is a MMIO device.
Move them to the ACLINT device. This also emulates the real hardware
more closely.
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Message-Id: <20220824221357.41070-2-atishp@rivosinc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
The arch review of AIA spec is completed and we now have official
extension names for AIA: Smaia (M-mode AIA CSRs) and Ssaia (S-mode
AIA CSRs).
Refer, section 1.6 of the latest AIA v0.3.1 stable specification at
https://github.com/riscv/riscv-aia/releases/download/0.3.1-draft.32/riscv-interrupts-032.pdf)
Based on above, we update QEMU RISC-V to:
1) Have separate config options for Smaia and Ssaia extensions
which replace RISCV_FEATURE_AIA in CPU features
2) Not generate AIA INTC compatible string in virt machine
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20220820042958.377018-1-apatel@ventanamicro.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Make ppc-uic a subclass of ppc4xx-dcr-device which will handle the cpu
link and make it uniform with the other PPC4xx devices.
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <eb548130cf60aea8a6ea4dba4dee1686b3cabc3d.1660746880.git.balaton@eik.bme.hu>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20220707163720.1421716-5-berrange@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Since commit 40244040a7, multi-socket configuration with plic is
broken as the hartid for second socket is calculated incorrectly.
The hartid stored in addr_config already includes the offset
for the base hartid for that socket. Adding it again would lead
to segfault while creating the plic device for the virt machine.
qdev_connect_gpio_out was also invoked with incorrect number of gpio
lines.
Fixes: 40244040a7 (hw/intc: sifive_plic: Avoid overflowing the addr_config buffer)
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20220723090335.671105-1-atishp@rivosinc.com>
[ Changes by AF:
- Change the qdev_connect_gpio_out() numbering
]
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Fix such errors:
1. We should not use 'unsigned long' type as argument when we use
find_first_bit(), and we use ctz64() to replace find_first_bit()
to fix this bug.
2. It is not standard to use '1ULL << irq' to generate a irq mask.
So, we replace it with 'MAKE_64BIT_MASK(irq, 1)'.
Fix coverity CID: 1489761 1489764 1489765
Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Message-Id: <20220715060740.1500628-3-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This replaces the IRQ array 'irq_inputs' with GPIO lines, the goal
being to remove 'irq_inputs' when all CPUs have been converted.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Acked-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20220705145814.461723-2-clg@kaod.org>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
In the M-profile Arm ARM, rule R_CVJS defines when an interrupt should
be set to the Pending state:
A) when the input line is high and the interrupt is not Active
B) when the input line transitions from low to high and the interrupt
is Active
(Note that the first of these is an ongoing condition, and the
second is a point-in-time event.)
This can be rephrased as:
1 when the line goes from low to high, set Pending
2 when Active goes from 1 to 0, if line is high then set Pending
3 ignore attempts to clear Pending when the line is high
and Active is 0
where 1 covers both B and one of the "transition into condition A"
cases, 2 deals with the other "transition into condition A"
possibility, and 3 is "don't drop Pending if we're already in
condition A". Transitions out of condition A don't affect Pending
state.
We handle case 1 in set_irq_level(). For an interrupt (as opposed
to other kinds of exception) the only place where we clear Active
is in armv7m_nvic_complete_irq(), where we handle case 2 by
checking for whether we need to re-pend the exception. For case 3,
the only places where we clear Pending state on an interrupt are in
armv7m_nvic_acknowledge_irq() (where we are setting Active so it
doesn't count) and for writes to NVIC_ICPRn.
It is the "write to NVIC_ICPRn" case that we missed: we must ignore
this if the input line is high and the interrupt is not Active.
(This required behaviour is differently and perhaps more clearly
stated in the v7M Arm ARM, which has pseudocode in section B3.4.1
that implies it.)
Reported-by: Igor Kotrasiński <i.kotrasinsk@samsung.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20220628154724.3297442-1-peter.maydell@linaro.org
It keeps repeating, move it to the header. This uses __builtin_ffsll() to
allow using the macros in #define.
This is not using the QEMU's FIELD macros as this would require changing
all such macros found in skiboot (the PPC PowerNV firmware).
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20220628080544.1509428-1-aik@ozlabs.ru>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
By the document of ipi mailsend device, byte is written only when the mask bit
is 0. The original code discards mask bit and overwrite the data always, this
patch fixes the issue.
Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Message-Id: <20220705064901.2353349-3-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
In general loongarch ipi device, 32bit registers is emulated, however for
anysend/mailsend device only 64bit register access is supported. So separate
the ipi memory region into two regions, including 32 bits and 64 bits.
Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Message-Id: <20220705064901.2353349-2-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Loongarch pch msi intc connects to extioi controller, the range of irq
number is 64-255. Add a property for irqbase, so that we can compute
the irq offset from the view of pch_msi controller with the method:
msi vector (from view of upper extioi intc) - irqbase
Signed-off-by: Mao Bibo <maobibo@loongson.cn>
Message-Id: <20220701030740.2469162-1-maobibo@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Inspired by Julia Lawall's fixing of Linux
kernel comments, I looked at qemu, although I did it manually.
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Message-Id: <20220614104045.85728-2-dgilbert@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
When accessing a thread context through the IC BAR, the offset of the
page in the BAR identifies the CPU. From that offset, we can compute
the PIR (processor ID register) of the CPU to do the data structure
lookup. On P10, the current code assumes an access for node 0 when
computing the PIR. Everything is almost in place to allow access for
other nodes though. So this patch reworks how the PIR value is
computed so that we can access all thread contexts through the IC BAR.
The PIR is already correct on P9, so no need to modify anything there.
Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20220602165310.558810-1-fbarrat@linux.ibm.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Since commit ad40be27 "target/riscv: Support start kernel directly by
KVM" we have been overflowing the addr_config on "M,MS..."
configurations, as reported https://gitlab.com/qemu-project/qemu/-/issues/1050.
This commit changes the loop in sifive_plic_create() from iterating over
the number of harts to just iterating over the addr_config. The
addr_config is based on the hart_config, and will contain interrup details
for all harts. This way we can't iterate past the end of addr_config.
Fixes: ad40be2708 ("target/riscv: Support start kernel directly by KVM")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1050
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Mingwang Li <limingwang@huawei.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220601013631.196854-1-alistair.francis@opensource.wdc.com>
We have about 30 instances of the typo/variant spelling 'writeable',
and over 500 of the more common 'writable'. Standardize on the
latter.
Change produced with:
sed -i -e 's/\([Ww][Rr][Ii][Tt]\)[Ee]\([Aa][Bb][Ll][Ee]\)/\1\2/g' $(git grep -il writeable)
and then hand-undoing the instance in linux-headers/linux/kvm.h.
Most of these changes are in comments or documentation; the
exceptions are:
* a local variable in accel/hvf/hvf-accel-ops.c
* a local variable in accel/kvm/kvm-all.c
* the PMCR_WRITABLE_MASK macro in target/arm/internals.h
* the EPT_VIOLATION_GPA_WRITABLE macro in target/i386/hvf/vmcs.h
(which is never used anywhere)
* the AR_TYPE_WRITABLE_MASK macro in target/i386/hvf/vmx.h
(which is never used anywhere)
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Stefan Weil <sw@weilnetz.de>
Message-id: 20220505095015.2714666-1-peter.maydell@linaro.org
This patch realize the EIOINTC interrupt controller.
Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220606124333.2060567-35-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This patch realize PCH-MSI interrupt controller.
Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220606124333.2060567-34-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This patch realize the PCH-PIC interrupt controller.
Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220606124333.2060567-33-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This patch realize the IPI interrupt controller.
Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220606124333.2060567-32-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
When writing a register from the TCTXT memory region (4th page within
the IC BAR), we were overwriting the Presentation Controller (PC)
register at the same offset. It looks like a silly cut and paste
error.
We were somehow lucky: the TCTXT registers being touched are
TCTXT_ENx/_SET/_RESET to enable physical threads and the PC registers
at the same offset are either not used by our model or the update was
harmless.
Found through code inspection.
Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20220523151859.72283-1-fbarrat@linux.ibm.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
timecmp update function should be invoked with hartid for which
timecmp is being updated. The following patch passes the incorrect
hartid to the update function.
Fixes: e2f01f3c2e ("hw/intc: Make RISC-V ACLINT mtime MMIO register writable")
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Frank Chang <frank.chang@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20220513221458.1192933-1-atishp@rivosinc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
We previously open-coded the expression for the number of virtual APR
registers and the assertion that it was not going to cause us to
overflow the cs->ich_apr[] array. Factor this out into a new
ich_num_aprs() function, for consistency with the icc_num_aprs()
function we just added for the physical APR handling.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220512151457.3899052-7-peter.maydell@linaro.org
Message-id: 20220506162129.2896966-6-peter.maydell@linaro.org
Make the GICv3 set its number of bits of physical priority from the
implementation-specific value provided in the CPU state struct, in
the same way we already do for virtual priority bits. Because this
would be a migration compatibility break, we provide a property
force-8-bit-prio which is enabled for 7.0 and earlier versioned board
models to retain the legacy "always use 8 bits" behaviour.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220512151457.3899052-6-peter.maydell@linaro.org
Message-id: 20220506162129.2896966-5-peter.maydell@linaro.org
The GICv3 code has always supported a configurable number of virtual
priority and preemption bits, but our implementation currently
hardcodes the number of physical priority bits at 8. This is not
what most hardware implementations provide; for instance the
Cortex-A53 provides only 5 bits of physical priority.
Make the number of physical priority/preemption bits driven by fields
in the GICv3CPUState, the way that we already do for virtual
priority/preemption bits. We set cs->pribits to 8, so there is no
behavioural change in this commit. A following commit will add the
machinery for CPUs to set this to the correct value for their
implementation.
Note that changing the number of priority bits would be a migration
compatibility break, because the semantics of the icc_apr[][] array
changes.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220512151457.3899052-5-peter.maydell@linaro.org
Message-id: 20220506162129.2896966-4-peter.maydell@linaro.org
The GIC_MIN_BPR constant defines the minimum BPR value that the TCG
emulated GICv3 supports. We're currently using this also as the
value we reset the KVM GICv3 ICC_BPR registers to, but this is only
right by accident.
We want to make the emulated GICv3 use a configurable number of
priority bits, which means that GIC_MIN_BPR will no longer be a
constant. Replace the uses in the KVM reset code with literal 0,
plus a constant explaining why this is reasonable.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220512151457.3899052-4-peter.maydell@linaro.org
Message-id: 20220506162129.2896966-3-peter.maydell@linaro.org
As noted in the comment, the PRIbits field in ICV_CTLR_EL1 is
supposed to match the ICH_VTR_EL2 PRIbits setting; that is, it is the
virtual priority bit setting, not the physical priority bit setting.
(For QEMU currently we always implement 8 bits of physical priority,
so the PRIbits field was previously 7, since it is defined to be
"priority bits - 1".)
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220512151457.3899052-3-peter.maydell@linaro.org
Message-id: 20220506162129.2896966-2-peter.maydell@linaro.org
We allow a GICv3 to be connected to any CPU, but we don't do anything
to handle the case where the CPU type doesn't in hardware have a
GICv3 CPU interface and so the various GIC configuration fields
(gic_num_lrs, vprebits, vpribits) are not specified.
The current behaviour is that we will add the EL1 CPU interface
registers, but will not put in the EL2 CPU interface registers, even
if the CPU has EL2, which will leave the GIC in a broken state and
probably result in the guest crashing as it tries to set it up. This
only affects the virt board when using the cortex-a15 or cortex-a7
CPU types (both 32-bit) with -machine gic-version=3 (or 'max')
and -machine virtualization=on.
Instead of failing to set up the EL2 registers, if the CPU doesn't
define the GIC configuration set it to a reasonable default, matching
the standard configuration for most Arm CPUs.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220512151457.3899052-2-peter.maydell@linaro.org
When pulling or pushing an OS context from/to a CPU, we should
re-evaluate the state of the External interrupt signal. Otherwise, we
can end up catching the External interrupt exception in hypervisor
mode, which is unexpected.
The problem is best illustrated with the following scenario:
1. an External interrupt is raised while the guest is on the CPU.
2. before the guest can ack the External interrupt, an hypervisor
interrupt is raised, for example the Hypervisor Decrementer or
Hypervisor Virtualization interrupt. The hypervisor interrupt forces
the guest to exit while the External interrupt is still pending.
3. the hypervisor handles the hypervisor interrupt. At this point, the
External interrupt is still pending. So it's very likely to be
delivered while the hypervisor is running. That's unexpected and can
result in an infinite loop where the hypervisor catches the External
interrupt, looks for an interrupt in its hypervisor queue, doesn't
find any, exits the interrupt handler with the External interrupt
still raised, repeat...
The fix is simply to always lower the External interrupt signal when
pulling an OS context. It means it needs to be raised again when
re-pushing the OS context. Fortunately, it's already the case, as we
now always call xive_tctx_ipb_update(), which will raise the signal if
needed.
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Message-Id: <20220429071620.177142-3-fbarrat@linux.ibm.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
The Post Interrupt Priority Register (PIPR) is not restored like the
other OS-context related fields of the TIMA when pushing an OS context
on the CPU. It's not needed because it can be calculated from the
Interrupt Pending Buffer (IPB), which is saved and restored. The PIPR
must therefore always be recomputed when pushing an OS context.
This patch fixes a path on P9 and P10 where it was not done. If there
was a pending interrupt when the OS context was pulled, the IPB was
saved correctly. When pushing back the context, the code in
xive_tctx_need_resend() was checking for a interrupt raised while the
context was not on the CPU, saved in the NVT. If one was found, then
it was merged with the saved IPB and the PIPR updated and everything
was fine. However, if there was no interrupt found in the NVT, then
xive_tctx_ipb_update() was not being called and the PIPR was not
updated. This patch fixes it by always calling xive_tctx_ipb_update().
Note that on P10 (xive2.c) and because of the above, there's no longer
any need to check the CPPR value so it can go away.
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Message-Id: <20220429071620.177142-2-fbarrat@linux.ibm.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Remove a possible source of error by removing REGINFO_SENTINEL
and using ARRAY_SIZE (convinently hidden inside a macro) to
find the end of the set of regs being registered or modified.
The space saved by not having the extra array element reduces
the executable's .data.rel.ro section by about 9k.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220501055028.646596-4-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Move ARMCPRegInfo and all related declarations to a new
internal header, out of the public cpu.h.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220501055028.646596-2-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Implement nios2 Vectored Interrupt Controller (VIC).
VIC is connected to EIC. It needs to update rha, ril, rrs and rnmi
fields on Nios2CPU before raising an IRQ.
For that purpose, VIC has a "cpu" property which should refer to the
nios2 cpu and set by the board that connects VIC.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Amir Gonnen <amir.gonnen@neuroblade.ai>
Message-Id: <20220303153906.2024748-5-amir.gonnen@neuroblade.ai>
[rth: Split out nios2_vic.h]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220421151735.31996-60-richard.henderson@linaro.org>
Now that we have implemented all the GICv4 requirements, relax the
error-checking on the GIC object's 'revision' property to allow a TCG
GIC to be a GICv4, whilst still constraining the KVM GIC to GICv3.
Our 'revision' property doesn't consider the possibility of wanting
to specify the minor version of the GIC -- for instance there is a
GICv3.1 which adds support for extended SPI and PPI ranges, among
other things, and also GICv4.1. But since the QOM property is
internal to QEMU, not user-facing, we can cross that bridge when we
come to it. Within the GIC implementation itself code generally
checks against the appropriate ID register feature bits, and the
only use of s->revision is for setting those ID register bits.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-39-peter.maydell@linaro.org
Update the various GIC ID and feature registers for GICv4:
* PIDR2 [7:4] is the GIC architecture revision
* GICD_TYPER.DVIS is 1 to indicate direct vLPI injection support
* GICR_TYPER.VLPIS is 1 to indicate redistributor support for vLPIs
* GITS_TYPER.VIRTUAL is 1 to indicate vLPI support
* GITS_TYPER.VMOVP is 1 to indicate that our VMOVP implementation
handles cross-ITS synchronization for the guest
* ICH_VTR_EL2.nV4 is 0 to indicate direct vLPI injection support
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-38-peter.maydell@linaro.org
Implement the function gicv3_redist_inv_vlpi(), which was previously
left as a stub. This is the function that does the work of the INV
command for a virtual interrupt.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-37-peter.maydell@linaro.org
Implement the gicv3_redist_vinvall() function (previously left as a
stub). This function handles the work of a VINVALL command: it must
invalidate any cached information associated with a specific vCPU.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-36-peter.maydell@linaro.org
Implement the gicv3_redist_mov_vlpi() function (previously left as a
stub). This function handles the work of a VMOVI command: it marks
the vLPI not-pending on the source and pending on the destination.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-35-peter.maydell@linaro.org
We can use our new set_pending_table_bit() utility function
in gicv3_redist_mov_lpi() to clear the bit in the source
pending table, rather than doing the "load, clear bit, store"
ourselves.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-34-peter.maydell@linaro.org
Implement the function gicv3_redist_vlpi_pending(), which was
previously left as a stub. This is the function that is called by
the CPU interface when it changes the state of a vLPI. It's similar
to gicv3_redist_process_vlpi(), but we know that the vCPU is
definitely resident on the redistributor and the irq is in range, so
it is a bit simpler.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-33-peter.maydell@linaro.org
Implement the function gicv3_redist_process_vlpi(), which was left as
just a stub earlier. This function deals with being handed a VLPI by
the ITS. It must set the bit in the pending table. If the vCPU is
currently resident we must recalculate the highest priority pending
vLPI; otherwise we may need to ring a "doorbell" interrupt to let the
hypervisor know it might want to reschedule the vCPU.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-32-peter.maydell@linaro.org
Factor out the code which sets a single bit in an LPI pending table.
We're going to need this for handling vLPI tables, not just the
physical LPI table.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-31-peter.maydell@linaro.org
The guest uses GICR_VPENDBASER to tell the redistributor when it is
scheduling or descheduling a vCPU. When it writes and changes the
VALID bit from 0 to 1, it is scheduling a vCPU, and we must update
our view of the current highest priority pending vLPI from the new
Pending and Configuration tables. When it writes and changes the
VALID bit from 1 to 0, it is descheduling, which means that there is
no longer a highest priority pending vLPI.
The specification allows the implementation to use part of the vLPI
Pending table as an IMPDEF area where it can cache information when a
vCPU is descheduled, so that it can avoid having to do a full rescan
of the tables when the vCPU is scheduled again. For now, we don't
take advantage of this, and simply do a complete rescan.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-30-peter.maydell@linaro.org
Factor out the common part of gicv3_redist_update_lpi_only() into
a new function update_for_all_lpis(), which does a full rescan
of an LPI Pending table and sets the specified PendingIrq struct
with the highest priority pending enabled LPI it finds.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-29-peter.maydell@linaro.org
Currently the functions which update the highest priority pending LPI
information by looking at the LPI Pending and Configuration tables
are hard-coded to use the physical LPI tables addressed by
GICR_PENDBASER and GICR_PROPBASER. To support virtual LPIs we will
need to do essentially the same job, but looking at the current
virtual LPI Pending and Configuration tables and updating cs->hppvlpi
instead of cs->hpplpi.
Factor out the common part of the gicv3_redist_check_lpi_priority()
function into a new update_for_one_lpi() function, which updates
a PendingIrq struct if the specified LPI is higher priority than
what is currently recorded there.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-28-peter.maydell@linaro.org
The maintenance interrupt state depends only on:
* ICH_HCR_EL2
* ICH_LR<n>_EL2
* ICH_VMCR_EL2 fields VENG0 and VENG1
Now we have a separate function that updates only the vIRQ and vFIQ
lines, use that in places that only change state that affects vIRQ
and vFIQ but not the maintenance interrupt.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-27-peter.maydell@linaro.org
The CPU interface changes to support vLPIs are fairly minor:
in the parts of the code that currently look at the list registers
to determine the highest priority pending virtual interrupt, we
must also look at the highest priority pending vLPI. To do this
we change hppvi_index() to check the vLPI and return a special-case
value if that is the right virtual interrupt to take. The callsites
(which handle HPPIR and IAR registers and the "raise vIRQ and vFIQ
lines" code) then have to handle this special-case value.
This commit includes two interfaces with the as-yet-unwritten
redistributor code:
* the new GICv3CPUState::hppvlpi will be set by the redistributor
(in the same way as the existing hpplpi does for physical LPIs)
* when the CPU interface acknowledges a vLPI it needs to set it
to non-pending; the new gicv3_redist_vlpi_pending() function
(which matches the existing gicv3_redist_lpi_pending() used
for physical LPIs) is a stub that will be filled in later
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-26-peter.maydell@linaro.org
The function gicv3_cpuif_virt_update() currently sets all of vIRQ,
vFIQ and the maintenance interrupt. This implies that it has to be
used quite carefully -- as the comment notes, setting the maintenance
interrupt will typically cause the GIC code to be re-entered
recursively. For handling vLPIs, we need the redistributor to be
able to tell the cpuif to update the vIRQ and vFIQ lines when the
highest priority pending vLPI changes. Since that change can't cause
the maintenance interrupt state to change, we can pull the "update
vIRQ/vFIQ" parts of gicv3_cpuif_virt_update() out into a separate
function, which the redistributor can then call without having to
worry about the reentrancy issue.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-25-peter.maydell@linaro.org
Implement the new GICv4 redistributor registers: GICR_VPROPBASER
and GICR_VPENDBASER; for the moment we implement these as simple
reads-as-written stubs, together with the necessary migration
and reset handling.
We don't put ID-register checks on the handling of these registers,
because they are all in the only-in-v4 extra register frames, so
they're not accessible in a GICv3.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-24-peter.maydell@linaro.org
