qemu-kvm/kvm-dump-simplify-a-bit-kdump-get_next_page.patch

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From bb55fde4d8ca587e2ef52ce58a0c22e4d66a08dc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
Date: Thu, 25 Aug 2022 12:40:12 +0400
Subject: [PATCH 30/42] dump: simplify a bit kdump get_next_page()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Cédric Le Goater <clg@redhat.com>
RH-MergeRequest: 226: s390: Enhanced Interpretation for PCI Functions and Secure Execution guest dump
RH-Bugzilla: 1664378 2043909
RH-Acked-by: Thomas Huth <thuth@redhat.com>
RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
RH-Acked-by: Jon Maloy <jmaloy@redhat.com>
RH-Commit: [30/41] 417ac19fa96036e0242f40121ac6e87a9f3f70ba
This should be functionally equivalent, but slightly easier to read,
with simplified paths and checks at the end of the function.
The following patch is a major rewrite to get rid of the assert().
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
(cherry picked from commit 08df343874fcddd260021a04ce3c5a34f2c48164)
Signed-off-by: Cédric Le Goater <clg@redhat.com>
---
dump/dump.c | 21 ++++++++-------------
1 file changed, 8 insertions(+), 13 deletions(-)
diff --git a/dump/dump.c b/dump/dump.c
index c2c1341ad7..1c49232390 100644
--- a/dump/dump.c
+++ b/dump/dump.c
@@ -1133,17 +1133,11 @@ static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr,
if (!block) {
block = QTAILQ_FIRST(&s->guest_phys_blocks.head);
*blockptr = block;
- assert((block->target_start & ~target_page_mask) == 0);
- assert((block->target_end & ~target_page_mask) == 0);
- *pfnptr = dump_paddr_to_pfn(s, block->target_start);
- if (bufptr) {
- *bufptr = block->host_addr;
- }
- return true;
+ addr = block->target_start;
+ } else {
+ addr = dump_pfn_to_paddr(s, *pfnptr + 1);
}
-
- *pfnptr = *pfnptr + 1;
- addr = dump_pfn_to_paddr(s, *pfnptr);
+ assert(block != NULL);
if ((addr >= block->target_start) &&
(addr + s->dump_info.page_size <= block->target_end)) {
@@ -1155,12 +1149,13 @@ static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr,
if (!block) {
return false;
}
- assert((block->target_start & ~target_page_mask) == 0);
- assert((block->target_end & ~target_page_mask) == 0);
- *pfnptr = dump_paddr_to_pfn(s, block->target_start);
+ addr = block->target_start;
buf = block->host_addr;
}
+ assert((block->target_start & ~target_page_mask) == 0);
+ assert((block->target_end & ~target_page_mask) == 0);
+ *pfnptr = dump_paddr_to_pfn(s, addr);
if (bufptr) {
*bufptr = buf;
}
--
2.37.3