Commit graph

1886 commits

Author SHA1 Message Date
BALATON Zoltan
269d6f006b target/ppc: Introduce mmu6xx_get_physical_address()
Repurpose get_segment_6xx_tlb() to do the whole address translation
for POWERPC_MMU_SOFT_6xx MMU model by moving the BAT check there and
renaming it to match other similar functions. These are only called
once together so no need to keep these separate functions and
combining them simplifies the caller allowing further restructuring.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:41:18 +10:00
BALATON Zoltan
cfd5c12832 target/ppc: Drop cases for unimplemented MPC8xx MMU
Drop MPC8xx cases from get_physical_address_wtlb() and ppc_jumbo_xlate().
The default case would still catch this and abort the same way and
there is still a warning about it in ppc_tlb_invalidate_all() which is
called in ppc_cpu_reset_hold() so likely we never get here but to make
sure add a case to ppc_xlate() to the same effect.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:41:17 +10:00
BALATON Zoltan
fef517cd8a target/ppc: Simplify checking for real mode in get_physical_address_wtlb()
In get_physical_address_wtlb() the real_mode flag depends on either
the MSR[IR] or MSR[DR] bit depending on access_type. Extract just the
needed bit in a more straight forward way instead of doing unnecessary
computation.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:41:17 +10:00
BALATON Zoltan
750fbe3342 target/ppc: Remove unneeded local variable from booke tlb checks
In mmubooke_check_tlb() and mmubooke206_check_tlb() we can assign the
value of prot2 directly to the destination, no need to have a separate
local variable for it.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:41:17 +10:00
BALATON Zoltan
3f520078de target/ppc: Move calculation of a value closer to its usage in booke tlb checks
In mmubooke_check_tlb() and mmubooke206_check_tlb() prot2 is
calculated first but only used after an unrelated check that can
return before tha value is used. Move the calculation after the check,
closer to where it is used, to keep them together and avoid computing
it when not needed.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:41:15 +10:00
BALATON Zoltan
2b92822acc target/ppc: Remove unused helper_rac()
The helper_rac function is defined but not used, remove it.

Fixes: 005b69fdcc (target/ppc: Remove PowerPC 601 CPUs)
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:34:42 +10:00
Dr. David Alan Gilbert
41e9a098d1 target/ppc: Remove unused struct 'mmu_ctx_hash32'
I think it's use was removed by
Commit 5883d8b296 ("mmu-hash*: Don't use full ppc_hash{32,
64}_translate() path for get_phys_page_debug()")

Reviewed-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Dr. David Alan Gilbert <dave@treblig.org>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:34:41 +10:00
Nicholas Piggin
0dfe59fe77 target/ppc: add SMT support to msgsnd broadcast
msgsnd has a broadcast mode that sends hypervisor doorbells to all
threads belonging to the same core as the target. A "subcore" mode
sends to all or one thread depending on 1LPAR mode.

Reviewed-by: Glenn Miles <milesg@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:34:41 +10:00
Nicholas Piggin
2736432ffc target/ppc: Implement SPRC/SPRD SPRs
This implements the POWER SPRC/SPRD SPRs, and SCRATCH0-7 registers that
can be accessed via these indirect SPRs.

SCRATCH registers only provide storage, but they are used by firmware
for low level crash and progress data, so this implementation logs
writes to the registers to help with analysis.

Reviewed-by: Glenn Miles <milesg@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:34:40 +10:00
Nicholas Piggin
c9d5aedf40 target/ppc: Implement LDBAR, TTR SPRs
LDBAR, TTR are a Power-specific SPRs. These simple implementations
are enough for IBM proprietary firmware for now.

Reviewed-by: Glenn Miles <milesg@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:34:40 +10:00
Nicholas Piggin
4d2b0ad32a target/ppc: Add SMT support to PTCR SPR
PTCR is a per-core register.

Reviewed-by: Glenn Miles <milesg@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:34:40 +10:00
Nicholas Piggin
e5c2ac9dc1 target/ppc: Add SMT support to simple SPRs
AMOR, MMCRC, HRMOR, TSCR, HMEER, RPR SPRs are per-core or per-LPAR
registers with simple (generic) implementations.

Reviewed-by: Glenn Miles <milesg@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:34:39 +10:00
Nicholas Piggin
5fa7efe473 target/ppc: add helper to write per-LPAR SPRs
An SPR can be either per-thread, per-core, or per-LPAR. Per-LPAR means
per-thread or per-core, depending on 1LPAR mode.

Reviewed-by: Glenn Miles <milesg@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:34:39 +10:00
Nicholas Piggin
1cbcbcb8d6 target/ppc: Add PPR32 SPR
PPR32 provides access to the upper half of PPR.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:34:39 +10:00
Nicholas Piggin
e89294b27e target/ppc: BookE DECAR SPR is 32-bit
The DECAR SPR is 32-bits width.

Reviewed-by: Glenn Miles <milesg@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:34:38 +10:00
Nicholas Piggin
45693f94dd target/ppc: Implement attn instruction on BookS 64-bit processors
attn is an implementation-specific instruction that on POWER (and G5/
970) can be enabled with a HID bit (disabled = illegal), and executing
it causes the host processor to stop and the service processor to be
notified. Generally used for debugging.

Implement attn and make it checkstop the system, which should be good
enough for QEMU debugging.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:34:38 +10:00
Nicholas Piggin
9728fb5c22 target/ppc: improve checkstop logging
Change the logging not to print to stderr as well, because a
checkstop is a guest error (or perhaps a simulated machine error)
rather than a QEMU error, so send it to the log.

Update the checkstop message, and log CPU registers too.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Glenn Miles <milesg@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:34:38 +10:00
Nicholas Piggin
cce7aee8dd target/ppc: Make checkstop actually stop the system
checkstop state does not halt the system, interrupts continue to be
serviced, and other CPUs run. Make it stop the machine with
qemu_system_guest_panicked.

Reviewed-by: Glenn Miles <milesg@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:34:38 +10:00
Nicholas Piggin
c10c6ce032 target/ppc: Remove redundant MEMOP_GET_SIZE macro
There is a memop_size() function for this.

Reviewed-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:34:37 +10:00
Nicholas Piggin
21cfc36a6c target/ppc: larx/stcx generation need only apply DEF_MEMOP() once
Use DEF_MEMOP() consistently in larx and stcx. generation, and apply it
once when it's used rather than where the macros are expanded, to reduce
typing.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:34:32 +10:00
Glenn Miles
dabd6d3c3a target/ppc: Add migration support for BHRB
Adds migration support for Branch History Rolling
Buffer (BHRB) internal state.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:33:44 +10:00
Glenn Miles
6bfcf1dc23 target/ppc: Add clrbhrb and mfbhrbe instructions
Add support for the clrbhrb and mfbhrbe instructions.

Since neither instruction is believed to be critical to
performance, both instructions were implemented using helper
functions.

Access to both instructions is controlled by bits in the
HFSCR (for privileged state) and MMCR0 (for problem state).
A new function, helper_mmcr0_facility_check, was added for
checking MMCR0[BHRBA] and raising a facility_unavailable exception
if required.

NOTE: For P8 and P9, due to a performance issue, branch history will
not be kept, but the instructions will be allowed to execute
as normal with the exception that the mfbhrbe instruction will
always return a zero value.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:33:32 +10:00
Glenn Miles
4de4a4705f target/ppc: Add recording of taken branches to BHRB
This commit continues adding support for the Branch History
Rolling Buffer (BHRB) as is provided starting with the P8
processor and continuing with its successors.  This commit
is limited to the recording and filtering of taken branches.

The following changes were made:

  - Enabled functionality on P10 processors only due to
    performance impact seen with P8 and P9 where it is not
    disabled for non problem state branches.
  - Added a BHRB buffer for storing branch instruction and
    target addresses for taken branches
  - Renamed gen_update_cfar to gen_update_branch_history and
    added a 'target' parameter to hold the branch target
    address and 'inst_type' parameter to use for filtering
  - Added TCG code to gen_update_branch_history that stores
    data to the BHRB and updates the BHRB offset.
  - Added BHRB resource initialization and reset functions

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:33:06 +10:00
Glenn Miles
a7138e28a2 target/ppc: Add new hflags to support BHRB
This commit is preparatory to the addition of Branch History
Rolling Buffer (BHRB) functionality, which is being provided
today starting with the P8 processor.

BHRB uses several SPR register fields to control whether or not
a branch instruction's address (and sometimes target address)
should be recorded.  Checking each of these fields with each
branch instruction using jitted code would lead to a significant
decrease in performance.

Therefore, it was decided that BHRB configuration bits that are
not expected to change frequently should have their state summarized
in an hflag so that the amount of checking done by jitted code can
be reduced.

This commit contains the changes for summarizing the state of the
following register fields in the HFLAGS_BHRB_ENABLE hflag:

	MMCR0[FCP] - Determines if BHRB recording is frozen in the
                     problem state

	MMCR0[FCPC] - A modifier for MMCR0[FCP]

	MMCRA[BHRBRD] - Disables all BHRB recording for a thread

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Chinmay Rath
687a30ad3c target/ppc: Move VMX integer max/min instructions to decodetree.
Moving the following instructions to decodetree specification :

	v{max, min}{u, s}{b, h, w, d}	: VX-form

The changes were verified by validating that the tcg ops generated by those
instructions remain the same, which were captured with the '-d in_asm,op' flag.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Chinmay Rath
664eb39ec9 target/ppc: Move VMX integer logical instructions to decodetree.
Moving the following instructions to decodetree specification:

	v{and, andc, nand, or, orc, nor, xor, eqv}	: VX-form

The changes were verified by validating that the tcp ops generated by those
instructions remain the same, which were captured with the '-d in_asm,op' flag.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Chinmay Rath
21b5f5464f target/ppc: Move VMX storage access instructions to decodetree
Moving the following instructions to decodetree specification :

	{l,st}ve{b,h,w}x,
	{l,st}v{x,xl},
	lvs{l,r}		: X-form

The changes were verified by validating that the tcg ops generated by those
instructions remain the same, which were captured using the '-d in_asm,op' flag.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Chinmay Rath
948e257c48 target/ppc: Move logical fixed-point instructions to decodetree.
Moving the below instructions to decodetree specification :

	andi[s]., {ori, xori}[s]			: D-form

	{and, andc, nand, or, orc, nor, xor, eqv}[.],
	exts{b, h, w}[.],  cnt{l, t}z{w, d}[.],
	popcnt{b, w, d},  prty{w, d}, cmp, bpermd	: X-form

With this patch, all the fixed-point logical instructions have been
moved to decodetree.
The changes were verified by validating that the tcg ops generated by those
instructions remain the same, which were captured with the '-d in_asm,op' flag.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
[np: 32-bit compile fix]
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Chinmay Rath
ae556c6a49 target/ppc: Move cmp{rb, eqb}, tw[i], td[i], isel instructions to decodetree.
Moving the following instructions to decodetree specification :

	cmp{rb, eqb}, t{w, d}	: X-form
	t{w, d}i		: D-form
	isel			: A-form

The changes were verified by validating that the tcg ops generated by those
instructions remain the same, which were captured using the '-d in_asm,op' flag.
Also for CMPRB, following review comments :
Replaced repetition of arithmetic right shifting (tcg_gen_shri_i32) followed
by extraction of last 8 bits (tcg_gen_ext8u_i32) with extraction of the required
bits using offsets (tcg_gen_extract_i32).

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
[np: 32-bit compile fix]
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Chinmay Rath
f424bc10eb target/ppc: Move div/mod fixed-point insns (64 bits operands) to decodetree.
Moving the below instructions to decodetree specification :

	divd[u, e, eu][o][.]	: XO-form
	mod{sd, ud}		: X-form

With this patch, all the fixed-point arithmetic instructions have been
moved to decodetree.
The changes were verified by validating that the tcg ops generated by those
instructions remain the same, which were captured using the '-d in_asm,op' flag.
Also, remaned do_divwe method in fixedpoint-impl.c.inc to do_dive because it is
now used to divide doubleword operands as well, and not just words.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
[np: 32-bit compile fix]
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Chinmay Rath
703e88f723 target/ppc: Move multiply fixed-point insns (64-bit operands) to decodetree.
Moving the following instructions to decodetree :

	mul{ld, ldo, hd, hdu}[.]	: XO-form
	madd{hd, hdu, ld}		: VA-form

The changes were verified by validating that the tcg ops generated by those
instructions remain the same, which were captured with the '-d in_asm,op'
flag.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
[np: 32-bit compile fix]
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Chinmay Rath
a81b5c1867 target/ppc: Move neg, darn, mod{sw, uw} to decodetree.
Moving the below instructions to decodetree specification :

	neg[o][.]       	: XO-form
	mod{sw, uw}, darn	: X-form

The changes were verified by validating that the tcg ops generated by those
instructions remain the same, which were captured with the '-d in_asm,op' flag.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
[np: 32-bit compile fix]
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Chinmay Rath
2871921d85 target/ppc: Move divw[u, e, eu] instructions to decodetree.
Moving the following instructions to decodetree specification :
	 divw[u, e, eu][o][.] 	: XO-form

The changes were verified by validating that the tcg ops generated by those
instructions remain the same, which were captured with the '-d in_asm,op' flag.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Chinmay Rath
86e6202a57 target/ppc: Make divw[u] handler method decodetree compatible.
The handler methods for divw[u] instructions internally use Rc(ctx->opcode),
for extraction of Rc field of instructions, which poses a problem if we move
the above said instructions to decodetree, as the ctx->opcode field is not
popluated in decodetree. Hence, making it decodetree compatible, so that the
mentioned insns can be safely move to decodetree specs.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Chinmay Rath
a1faff873a target/ppc: Move mul{li, lw, lwo, hw, hwu} instructions to decodetree.
Moving the following instructions to decodetree specification :
	mulli                   	: D-form
	mul{lw, lwo, hw, hwu}[.]	: XO-form

The changes were verified by validating that the tcg ops generated by those
instructions remain the same, which were captured with the '-d in_asm,op' flag.
Also cleaned up code for mullw[o][.] as per review comments while
keeping the logic of the tcg ops generated semantically same.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Chinmay Rath
177fcc06dc target/ppc: Move floating-point arithmetic instructions to decodetree.
This patch moves the below instructions to decodetree specification :

    f{add, sub, mul, div, re, rsqrte, madd, msub, nmadd, nmsub}[s][.] : A-form
    ft{div, sqrt}                                                     : X-form

With this patch, all the floating-point arithmetic instructions have been
moved to decodetree.
The changes were verified by validating that the tcg ops generated by those
instructions remain the same, which were captured with the '-d in_asm,op' flag.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Chinmay Rath
5747926fec target/ppc: Merge various fpu helpers
This patch merges the definitions of the following set of fpu helper methods,
which are similar, using macros :

1. f{add, sub, mul, div}(s)
2. fre(s)
3. frsqrte(s)

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Nicholas Piggin
b3cfa2dd2b target/ppc: Add ISA v3.1 variants of sync instruction
POWER10 adds a new field to sync for store-store syncs, and some
new variants of the existing syncs that include persistent memory.

Implement the store-store syncs and plwsync/phwsync.

Reviewed-by: Chinmay Rath <rathc@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Nicholas Piggin
ab4f174bae target/ppc: Fix embedded memory barriers
Memory barriers are supposed to do something on BookE systems, these
were probably just missed during MTTCG enablement, maybe no targets
support SMP. Either way, add proper BookE implementations.

Reviewed-by: Chinmay Rath <rathc@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Nicholas Piggin
13f5086783 target/ppc: Move sync instructions to decodetree
This tries to faithfully reproduce the odd BookE logic. Note the
e206 check in gen_msync_4xx() is always false, so not carried over.

It does change the handling of non-zero reserved bits outside the
defined fields from being illegal to being ignored, which the
architecture specifies ot help with backward compatibility of new
fields. The existing behaviour causes illegal instruction exceptions
when using new POWER10 sync variants that add new fields, after this
the instructions are accepted and are implemented as supersets of
the new behaviour, as intended.

Reviewed-by: Chinmay Rath <rathc@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Nicholas Piggin
82676f1fc4 target/ppc: Fix broadcast tlbie synchronisation
With mttcg, broadcast tlbie instructions do not wait until other vCPUs
have been kicked out of TCG execution before they complete (including
necessary subsequent tlbsync, etc., instructions). This is contrary to
the ISA, and it permits other vCPUs to use translations after the TLB
flush. For example:

   CPU0
   // *memP is initially 0, memV maps to memP with *pte
   *pte = 0;
   ptesync ; tlbie ; eieio ; tlbsync ; ptesync
   *memP = 1;

   CPU1
   assert(*memV == 0);

It is possible for the assertion to fail because CPU1 translates memV
using the TLB after CPU0 has stored 1 to the underlying memory. This
race was observed with a careful test case where CPU1 checks run in a
very large expensive TB so it can run for the entire CPU0 period between
clearing the pte and storing the memory, but host vCPU thread preemption
could cause the race to hit anywhere.

As explained in commit 4ddc104689 ("target/ppc: Fix tlbie"), it is not
enough to just use tlb_flush_all_cpus_synced(), because that does not
execute until the calling CPU has finished its TB. It is also required
that the TB is ended at the point where the TLB flush must subsequently
take effect.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Nicholas Piggin
c700b5e162 spapr: avoid overhead of finding vhyp class in critical operations
PPC_VIRTUAL_HYPERVISOR_GET_CLASS is used in critical operations like
interrupts and TLB misses and is quite costly. Running the
kvm-unit-tests sieve program with radix MMU enabled thrashes the TCG
TLB and spends a lot of time in TLB and page table walking code. The
test takes 67 seconds to complete with a lot of time being spent in
code related to finding the vhyp class:

   12.01%  [.] g_str_hash
    8.94%  [.] g_hash_table_lookup
    8.06%  [.] object_class_dynamic_cast
    6.21%  [.] address_space_ldq
    4.94%  [.] __strcmp_avx2
    4.28%  [.] tlb_set_page_full
    4.08%  [.] address_space_translate_internal
    3.17%  [.] object_class_dynamic_cast_assert
    2.84%  [.] ppc_radix64_xlate

Keep a pointer to the class and avoid this lookup. This reduces the
execution time to 40 seconds.

Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +10:00
Richard Henderson
962a145cdc accel/tcg: Provide default implementation of disas_log
Almost all of the disas_log implementations are identical.
Unify them within translator_loop.

Drop extra Priv/Virt logging from target/riscv.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2024-05-15 08:55:18 +02:00
Philippe Mathieu-Daudé
40fed8c1d3 target/ppc: Replace g_memdup() by g_memdup2()
Per https://discourse.gnome.org/t/port-your-module-from-g-memdup-to-g-memdup2-now/5538

  The old API took the size of the memory to duplicate as a guint,
  whereas most memory functions take memory sizes as a gsize. This
  made it easy to accidentally pass a gsize to g_memdup(). For large
  values, that would lead to a silent truncation of the size from 64
  to 32 bits, and result in a heap area being returned which is
  significantly smaller than what the caller expects. This can likely
  be exploited in various modules to cause a heap buffer overflow.

Replace g_memdup() by the safer g_memdup2() wrapper.

Trivially safe because the argument was directly from sizeof.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Message-Id: <20210903174510.751630-27-philmd@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
2024-05-08 19:11:34 +02:00
Richard Henderson
873f9ca385 Accelerator patches
- Extract page-protection definitions to page-protection.h
 - Rework in accel/tcg in preparation of extracting TCG fields from CPUState
 - More uses of get_task_state() in user emulation
 - Xen refactors in preparation for adding multiple map caches (Juergen & Edgar)
 - MAINTAINERS updates (Aleksandar and Bin)
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Merge tag 'accel-20240506' of https://github.com/philmd/qemu into staging

Accelerator patches

- Extract page-protection definitions to page-protection.h
- Rework in accel/tcg in preparation of extracting TCG fields from CPUState
- More uses of get_task_state() in user emulation
- Xen refactors in preparation for adding multiple map caches (Juergen & Edgar)
- MAINTAINERS updates (Aleksandar and Bin)

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# gpg: Signature made Mon 06 May 2024 05:42:08 AM PDT
# gpg:                using RSA key FAABE75E12917221DCFD6BB2E3E32C2CDEADC0DE
# gpg: Good signature from "Philippe Mathieu-Daudé (F4BUG) <f4bug@amsat.org>" [full]

* tag 'accel-20240506' of https://github.com/philmd/qemu: (28 commits)
  MAINTAINERS: Update my email address
  MAINTAINERS: Update Aleksandar Rikalo email
  system: Pass RAM MemoryRegion and is_write in xen_map_cache()
  xen: mapcache: Break out xen_map_cache_init_single()
  xen: mapcache: Break out xen_invalidate_map_cache_single()
  xen: mapcache: Refactor xen_invalidate_map_cache_entry_unlocked
  xen: mapcache: Refactor xen_replace_cache_entry_unlocked
  xen: mapcache: Break out xen_ram_addr_from_mapcache_single
  xen: mapcache: Refactor xen_remap_bucket for multi-instance
  xen: mapcache: Refactor xen_map_cache for multi-instance
  xen: mapcache: Refactor lock functions for multi-instance
  xen: let xen_ram_addr_from_mapcache() return -1 in case of not found entry
  system: let qemu_map_ram_ptr() use qemu_ram_ptr_length()
  user: Use get_task_state() helper
  user: Declare get_task_state() once in 'accel/tcg/vcpu-state.h'
  user: Forward declare TaskState type definition
  accel/tcg: Move @plugin_mem_cbs from CPUState to CPUNegativeOffsetState
  accel/tcg: Restrict cpu_plugin_mem_cbs_enabled() to TCG
  accel/tcg: Restrict qemu_plugin_vcpu_exit_hook() to TCG plugins
  accel/tcg: Update CPUNegativeOffsetState::can_do_io field documentation
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2024-05-06 10:19:10 -07:00
Philippe Mathieu-Daudé
74781c0888 exec/cpu: Extract page-protection definitions to page-protection.h
Extract page-protection definitions from "exec/cpu-all.h"
to "exec/page-protection.h".

The list of files requiring the new header was generated
using:

$ git grep -wE \
  'PAGE_(READ|WRITE|EXEC|RWX|VALID|ANON|RESERVED|TARGET_.|PASSTHROUGH)'

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240427155714.53669-3-philmd@linaro.org>
2024-05-06 11:17:15 +02:00
Paolo Bonzini
bf616ce47b ppc: switch boards to "default y"
Some targets use "default y" for boards to filter out those that require
TCG.  For consistency we are switching all other targets to do the same.
Continue with PowerPC/POWER.

No changes to generated config-devices.mak files, other than
adding CONFIG_PPC to the ppc64-softmmu target.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-05-03 15:47:47 +02:00
Paolo Bonzini
566abdb4d9 kvm: ppc: disable sPAPR code if CONFIG_PSERIES is disabled
target/ppc/kvm.c calls out to code in hw/ppc/spapr*.c; that code is
not present and fails to link if CONFIG_PSERIES is not enabled.
Adjust kvm.c to depend on CONFIG_PSERIES instead of TARGET_PPC64,
and compile out anything that requires cap_papr, because only
the pseries machine will call kvmppc_set_papr().

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-05-03 15:47:47 +02:00
Thomas Huth
5b638f6e90 target/ppc/cpu_init: Remove "PowerPC" prefix from the CPU list
Printing a "PowerPC" in front of each CPU name is not helpful at all:
It is confusing for the users since they don't know whether they
have to specify these letters for the "-cpu" parameter, too, and
it also takes some precious space in the dense output of the CPU
entries. Let's simply remove this now and use two spaces at the
beginning of the lines for the indentation of the entries instead,
and add a "Available CPUs" in the very first line, like most other
target architectures are doing it for their CPU help output already.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2024-04-29 09:37:26 +03:00
Philippe Mathieu-Daudé
6ce1c9d085 exec: Declare CPUBreakpoint/CPUWatchpoint type in 'breakpoint.h' header
The CPUBreakpoint and CPUWatchpoint structures are declared
in "hw/core/cpu.h", which contains declarations related to
CPUState and CPUClass. Some source files only require the
BP/WP definitions and don't need to pull in all CPU* API.
In order to simplify, create a new "exec/breakpoint.h" header.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Anton Johansson <anjo@rev.ng>
Message-Id: <20240418192525.97451-3-philmd@linaro.org>
2024-04-26 17:03:05 +02:00