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KVM: selftests: Add vcpu_arch_put_guest() to do writes from guest code

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Introduce a macro, vcpu_arch_put_guest(), for "putting" values to memory
from guest code in "interesting" situations, e.g. when writing memory that
is being dirty logged.  Structure the macro so that arch code can provide
a custom implementation, e.g. x86 will use the macro to force emulation of
the access.

Use the helper in dirty_log_test, which is of particular interest (see
above), and in xen_shinfo_test, which isn't all that interesting, but
provides a second usage of the macro with a different size operand
(uint8_t versus uint64_t), i.e. to help verify that the macro works for
more than just 64-bit values.

Use "put" as the verb to align with the kernel's {get,put}_user()
terminology.

Link: https://lore.kernel.org/r/20240314185459.2439072-5-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2024-03-14 11:54:57 -07:00
parent e1ff11525d
commit 2f2bc6af6a
3 changed files with 9 additions and 4 deletions
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5
tools/testing/selftests/kvm/dirty_log_test.c
View File

@ -105,7 +105,7 @@ static void guest_code(void)
*/
for (i = 0; i < guest_num_pages; i++) {
addr = guest_test_virt_mem + i * guest_page_size;
*(uint64_t *)addr = READ_ONCE(iteration);
vcpu_arch_put_guest(*(uint64_t *)addr, READ_ONCE(iteration));
}
while (true) {
@ -114,7 +114,8 @@ static void guest_code(void)
addr += (guest_random_u64(&guest_rng) % guest_num_pages)
* guest_page_size;
addr = align_down(addr, host_page_size);
*(uint64_t *)addr = READ_ONCE(iteration);
vcpu_arch_put_guest(*(uint64_t *)addr, READ_ONCE(iteration));
}
GUEST_SYNC(1);

3
tools/testing/selftests/kvm/include/kvm_util_base.h
View File

@ -609,6 +609,9 @@ void *addr_gva2hva(struct kvm_vm *vm, vm_vaddr_t gva);
vm_paddr_t addr_hva2gpa(struct kvm_vm *vm, void *hva);
void *addr_gpa2alias(struct kvm_vm *vm, vm_paddr_t gpa);
#ifndef vcpu_arch_put_guest
#define vcpu_arch_put_guest(mem, val) do { (mem) = (val); } while (0)
#endif
static inline vm_paddr_t vm_untag_gpa(struct kvm_vm *vm, vm_paddr_t gpa)
{

5
tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c
View File

@ -171,8 +171,9 @@ static volatile bool guest_saw_irq;
static void evtchn_handler(struct ex_regs *regs)
{
struct vcpu_info *vi = (void *)VCPU_INFO_VADDR;
vi->evtchn_upcall_pending = 0;
vi->evtchn_pending_sel = 0;
vcpu_arch_put_guest(vi->evtchn_upcall_pending, 0);
vcpu_arch_put_guest(vi->evtchn_pending_sel, 0);
guest_saw_irq = true;
GUEST_SYNC(TEST_GUEST_SAW_IRQ);