From: Cornelia Huck <cohuck@redhat.com>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: qemu-s390x@nongnu.org,
Richard Henderson <richard.henderson@linaro.org>,
qemu-devel@nongnu.org, David Hildenbrand <david@redhat.com>
Subject: [Qemu-devel] [PULL 27/34] s390x/tcg: MVST: Fault-safe handling
Date: Thu, 19 Sep 2019 14:41:08 +0200 [thread overview]
Message-ID: <20190919124115.11510-28-cohuck@redhat.com> (raw)
In-Reply-To: <20190919124115.11510-1-cohuck@redhat.com>
From: David Hildenbrand <david@redhat.com>
Access at most single pages and document why. Using the access helpers
might over-indicate watchpoints within the same page, I guess we can
live with that.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
target/s390x/mem_helper.c | 24 +++++++++++++++++-------
1 file changed, 17 insertions(+), 7 deletions(-)
diff --git a/target/s390x/mem_helper.c b/target/s390x/mem_helper.c
index c836b69fcc12..671e917dc1f8 100644
--- a/target/s390x/mem_helper.c
+++ b/target/s390x/mem_helper.c
@@ -860,23 +860,33 @@ uint32_t HELPER(mvpg)(CPUS390XState *env, uint64_t r0, uint64_t r1, uint64_t r2)
/* string copy */
uint32_t HELPER(mvst)(CPUS390XState *env, uint32_t r1, uint32_t r2)
{
+ const int mmu_idx = cpu_mmu_index(env, false);
const uint64_t d = get_address(env, r1);
const uint64_t s = get_address(env, r2);
const uint8_t c = env->regs[0];
+ const int len = MIN(-(d | TARGET_PAGE_MASK), -(s | TARGET_PAGE_MASK));
+ S390Access srca, desta;
uintptr_t ra = GETPC();
- uint32_t len;
+ int i;
if (env->regs[0] & 0xffffff00ull) {
s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, ra);
}
- /* Lest we fail to service interrupts in a timely manner, limit the
- amount of work we're willing to do. For now, let's cap at 8k. */
- for (len = 0; len < 0x2000; ++len) {
- uint8_t v = cpu_ldub_data_ra(env, s + len, ra);
- cpu_stb_data_ra(env, d + len, v, ra);
+ /*
+ * Our access should not exceed single pages, as we must not report access
+ * exceptions exceeding the actually copied range (which we don't know at
+ * this point). We might over-indicate watchpoints within the pages
+ * (if we ever care, we have to limit processing to a single byte).
+ */
+ srca = access_prepare(env, s, len, MMU_DATA_LOAD, mmu_idx, ra);
+ desta = access_prepare(env, d, len, MMU_DATA_STORE, mmu_idx, ra);
+ for (i = 0; i < len; i++) {
+ const uint8_t v = access_get_byte(env, &srca, i, ra);
+
+ access_set_byte(env, &desta, i, v, ra);
if (v == c) {
- set_address_zero(env, r1, d + len);
+ set_address_zero(env, r1, d + i);
return 1;
}
}
--
2.20.1
next prev parent reply other threads:[~2019-09-19 13:03 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-19 12:40 [Qemu-devel] [PULL 00/34] s390x update Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 01/34] s390x/tcg: Reset exception_index to -1 instead of 0 Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 02/34] s390x/tcg: MVCL: Zero out unused bits of address Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 03/34] s390x/tcg: MVCL: Detect destructive overlaps Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 04/34] s390x/tcg: MVCL: Process max 4k bytes at a time Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 05/34] s390x/tcg: MVC: Increment the length once Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 06/34] s390x/tcg: MVC: Use is_destructive_overlap() Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 07/34] s390x/tcg: MVPG: Check for specification exceptions Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 08/34] s390x/tcg: MVPG: Properly wrap the addresses Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 09/34] s390x/tcg: MVCLU/MVCLE: Process max 4k bytes at a time Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 10/34] s390x/tcg: MVCS/MVCP: Check for special operation exceptions Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 11/34] s390x/tcg: MVCOS: Lengths are 32 bit in 24/31-bit mode Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 12/34] s390x/tcg: MVCS/MVCP: Properly wrap the length Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 13/34] s390x/tcg: MVST: Check for specification exceptions Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 14/34] s390x/tcg: MVST: Fix storing back the addresses to registers Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 15/34] s390x/tcg: Always use MMU_USER_IDX for CONFIG_USER_ONLY Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 16/34] s390x/tcg: Fault-safe memset Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 17/34] s390x/tcg: Fault-safe memmove Cornelia Huck
2019-09-19 12:40 ` [Qemu-devel] [PULL 18/34] s390x/tcg: MVCS/MVCP: Use access_memmove() Cornelia Huck
2019-09-19 12:41 ` [Qemu-devel] [PULL 19/34] s390x/tcg: MVC: Fault-safe handling on destructive overlaps Cornelia Huck
2019-09-19 12:41 ` [Qemu-devel] [PULL 20/34] s390x/tcg: MVCLU: Fault-safe handling Cornelia Huck
2019-09-19 12:41 ` [Qemu-devel] [PULL 21/34] s390x/tcg: OC: " Cornelia Huck
2019-09-19 12:41 ` [Qemu-devel] [PULL 22/34] s390x/tcg: XC: " Cornelia Huck
2019-09-19 12:41 ` [Qemu-devel] [PULL 23/34] s390x/tcg: NC: " Cornelia Huck
2019-09-19 12:41 ` [Qemu-devel] [PULL 24/34] s390x/tcg: MVCIN: " Cornelia Huck
2019-09-19 12:41 ` [Qemu-devel] [PULL 25/34] s390x/tcg: MVN: " Cornelia Huck
2019-09-19 12:41 ` [Qemu-devel] [PULL 26/34] s390x/tcg: MVZ: " Cornelia Huck
2019-09-19 12:41 ` Cornelia Huck [this message]
2019-09-19 12:41 ` [Qemu-devel] [PULL 28/34] s390x/tcg: MVO: " Cornelia Huck
2019-09-19 12:41 ` [Qemu-devel] [PULL 29/34] tests/tcg: target/s390x: Test MVO Cornelia Huck
2019-09-19 12:41 ` [Qemu-devel] [PULL 30/34] pc-bios/s390-ccw: Do not pre-initialize empty array Cornelia Huck
2019-09-19 12:41 ` [Qemu-devel] [PULL 31/34] pc-bios/s390-ccw/net: fix a possible memory leak in get_uuid() Cornelia Huck
2019-09-19 12:41 ` [Qemu-devel] [PULL 32/34] pc-bios/s390-ccw: Rebuild the s390-netboot.img firmware image Cornelia Huck
2019-09-19 12:41 ` [Qemu-devel] [PULL 33/34] s390x/kvm: Officially require at least kernel 3.15 Cornelia Huck
2019-09-19 12:41 ` [Qemu-devel] [PULL 34/34] s390x/cpumodel: Add the z15 name to the description of gen15a Cornelia Huck
2019-09-20 10:45 ` [PULL 00/34] s390x update Peter Maydell
2019-09-20 11:00 ` Cornelia Huck
2019-09-20 11:51 ` David Hildenbrand
2019-09-20 11:59 ` David Hildenbrand
2019-09-20 13:32 ` Cornelia Huck
2019-09-20 13:41 ` Peter Maydell
2019-09-20 15:34 ` David Hildenbrand
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